;;; ess-r-mode.el --- R customization  -*- lexical-binding: t; -*-

;; Copyright (C) 1997-2022 Free Software Foundation, Inc.
;; Author: A.J. Rossini
;; Created: 12 Jun 1997
;; Maintainer: ESS-core <ESS-core@r-project.org>

;; This file is part of GNU Emacs.

;;; License:
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see
;; <http://www.gnu.org/licenses/>

;;; Commentary:

;; This file defines all the R customizations for ESS.  See ess-s-lang.el
;; for general S language customizations.

;;; Code:

(eval-when-compile
  (require 'subr-x))
(require 'cl-lib)
(require 'compile)
(require 'ess-mode)
(require 'ess-help)
(require 'ess-s-lang)
(require 'ess-roxy)
(require 'ess-r-completion)
(require 'ess-r-syntax)
(require 'ess-r-package)
(require 'ess-trns)
(require 'ess-r-xref)
(when (>= emacs-major-version 26) (require 'ess-r-flymake)) ; Flymake rewrite in Emacs 26

(declare-function ess-rdired "ess-rdired" ())

(defcustom ess-r-mode-hook nil
  "Hook run when entering `ess-r-mode'."
  :options '(electric-layout-local-mode)
  :type 'hook
  :group 'ess-R)

;; Define and run old hook for backward compatibility. We don't
;; obsolete it with warnings because this is a historically important
;; user-facing variable and it would not be worth the trouble.
(defvar R-mode-hook nil
  "This variable is obsolete since ESS 19.04;
use `ess-r-mode-hook' instead.")
(add-hook 'ess-r-mode-hook (lambda () (run-hooks 'R-mode-hook)))

(defcustom ess-r-fetch-ESSR-on-remotes nil
  "If non-nil, when loading ESSR, fetch it from the GitHub repository.
Otherwise source from local ESS installation. When the value is
\\='ess-remote, fetch only with ess-remote's and not with TRAMP
connections. When t, always fetch from remotes. Change this
variable when loading ESSR code on remotes fails for you.

Fetching happens once per new ESSR version. The archive is stored
in ~/.config/ESSR/ESSRv[VERSION].rds file. You can download and
place it there manually if the remote has restricted network
access."
  :type '(choice (const nil :tag "Never")
                 (const ess-remote :tag "With ess-remote only")
                 (const t :tag "Always"))
  :group 'ess-R)

;; Silence the byte compiler
(defvar add-log-current-defun-header-regexp)

;; TODO: Refactor so as to not rely on dynamic scoping.  After that
;; refactor, also remove the file-local-variable byte-compile-warnings
;; (not lexical) at the bottom.
(defvar containing-sexp)
(defvar indent-point)
(defvar prev-containing-sexp)

(define-obsolete-variable-alias 'ess-r-versions 'ess-r-runner-prefixes "ESS 19.04")
(defcustom ess-r-runner-prefixes
  (let ((r-ver '("R-1" "R-2" "R-3" "R-4" "R-5" "R-6" "R-7" "R-devel" "R-patched")))
    (if (eq system-type 'darwin) (append r-ver '("R32" "R64")) r-ver))
  "List of partial strings for versions of R to access within ESS.
Each string specifies the start of a filename. If a filename
beginning with one of these strings is found on variable
`exec-path', a command for that version of R is made available.
For example, if the file \"R-1.8.1\" is found and this variable
includes the string \"R-1\", a function called `R-1.8.1' will be
available to run that version of R. If duplicate versions of the
same program are found (which happens if the same path is listed
on variable `exec-path' more than once), they are ignored by
calling `delete-dups'. Set this variable to nil to disable
searching for other versions of R. Setting this variable directly
does not take effect; use either \\[customize-option] or set the
value by using `ess-r-runners-reset'."
  :group 'ess-R
  :package-version '(ess . "19.04")
  :type '(repeat string)
  :set #'ess-r-runners-reset
  ;; Use `custom-initialize-default' since we call
  ;; `ess-r-define-runners' at the end of this file directly.
  :initialize #'custom-initialize-default)



;;*;; Mode definition

;;;*;;; UI (Keymaps / Menus)
(defvar ess-dev-map
  (let (ess-dev-map)
    (define-prefix-command 'ess-dev-map)
    (define-key ess-dev-map "\C-s" #'ess-r-set-evaluation-env)
    (define-key ess-dev-map "s"    #'ess-r-set-evaluation-env)
    (define-key ess-dev-map "T"    #'ess-toggle-tracebug)
    (define-key ess-dev-map "\C-l" #'ess-r-devtools-load-package)
    (define-key ess-dev-map "l"    #'ess-r-devtools-load-package)
    (define-key ess-dev-map "`"    #'ess-show-traceback)
    (define-key ess-dev-map "~"    #'ess-show-call-stack)
    (define-key ess-dev-map "\C-w" #'ess-watch)
    (define-key ess-dev-map "w"    #'ess-watch)
    (define-key ess-dev-map "\C-d" #'ess-debug-flag-for-debugging)
    (define-key ess-dev-map "d"    #'ess-debug-flag-for-debugging)
    (define-key ess-dev-map "\C-u" #'ess-debug-unflag-for-debugging)
    (define-key ess-dev-map "u"    #'ess-debug-unflag-for-debugging)
    (define-key ess-dev-map ""   #'ess-debug-unflag-for-debugging)
    (define-key ess-dev-map "\C-b" #'ess-bp-set)
    (define-key ess-dev-map "b"    #'ess-bp-set)
    (define-key ess-dev-map ""   #'ess-bp-set-conditional)
    (define-key ess-dev-map "B"    #'ess-bp-set-conditional)
    (define-key ess-dev-map "\C-L" #'ess-bp-set-logger)
    (define-key ess-dev-map "L"    #'ess-bp-set-logger)
    (define-key ess-dev-map "\C-o" #'ess-bp-toggle-state)
    (define-key ess-dev-map "o"    #'ess-bp-toggle-state)
    (define-key ess-dev-map "\C-k" #'ess-bp-kill)
    (define-key ess-dev-map "k"    #'ess-bp-kill)
    (define-key ess-dev-map "\C-K" #'ess-bp-kill-all)
    (define-key ess-dev-map "K"    #'ess-bp-kill-all)
    (define-key ess-dev-map "\C-n" #'ess-bp-next)
    (define-key ess-dev-map "n"    #'ess-bp-next)
    (define-key ess-dev-map "i"    #'ess-debug-goto-input-event-marker)
    (define-key ess-dev-map "I"    #'ess-debug-goto-input-event-marker)
    (define-key ess-dev-map "\C-p" #'ess-bp-previous)
    (define-key ess-dev-map "p"    #'ess-bp-previous)
    (define-key ess-dev-map "\C-e" #'ess-debug-toggle-error-action)
    (define-key ess-dev-map "e"    #'ess-debug-toggle-error-action)
    (define-key ess-dev-map "0"    #'ess-electric-selection)
    (define-key ess-dev-map "1"    #'ess-electric-selection)
    (define-key ess-dev-map "2"    #'ess-electric-selection)
    (define-key ess-dev-map "3"    #'ess-electric-selection)
    (define-key ess-dev-map "4"    #'ess-electric-selection)
    (define-key ess-dev-map "5"    #'ess-electric-selection)
    (define-key ess-dev-map "6"    #'ess-electric-selection)
    (define-key ess-dev-map "7"    #'ess-electric-selection)
    (define-key ess-dev-map "8"    #'ess-electric-selection)
    (define-key ess-dev-map "9"    #'ess-electric-selection)
    (define-key ess-dev-map "?"    #'ess-tracebug-show-help)
    ess-dev-map)
  "Keymap for commands related to development and debugging.")

(defvar ess-r-package-check-map
  (let (ess-r-package-check-map)
    (define-prefix-command 'ess-r-package-check-map)
    (define-key ess-r-package-check-map "\C-c" #'ess-r-devtools-check-package)
    (define-key ess-r-package-check-map "c"    #'ess-r-devtools-check-package)
    (define-key ess-r-package-check-map "\C-w" #'ess-r-devtools-check-with-winbuilder)
    (define-key ess-r-package-check-map "w"    #'ess-r-devtools-check-with-winbuilder)
    (define-key ess-r-package-check-map "h"    #'ess-r-rhub-check-package)
    ess-r-package-check-map)
  "Keymap for R package checks.")

(defvar ess-r-package-dev-map
  (let (ess-r-package-dev-map)
    (define-prefix-command 'ess-r-package-dev-map)
    (define-key ess-r-package-dev-map "\C-s" #'ess-r-set-evaluation-env)
    (define-key ess-r-package-dev-map "s"    #'ess-r-set-evaluation-env)
    (define-key ess-r-package-dev-map "\C-a" #'ess-r-devtools-execute-command)
    (define-key ess-r-package-dev-map "a"    #'ess-r-devtools-execute-command)
    (define-key ess-r-package-dev-map "\C-e" #'ess-r-devtools-execute-command)
    (define-key ess-r-package-dev-map "e"    #'ess-r-devtools-execute-command)
    (define-key ess-r-package-dev-map "\C-b" #'ess-r-devtools-build)
    (define-key ess-r-package-dev-map "b"    #'ess-r-devtools-build)
    (define-key ess-r-package-dev-map "\C-c" 'ess-r-package-check-map)
    (define-key ess-r-package-dev-map "c"    'ess-r-package-check-map)
    (define-key ess-r-package-dev-map "\C-d" #'ess-r-devtools-document-package)
    (define-key ess-r-package-dev-map "d"    #'ess-r-devtools-document-package)
    (define-key ess-r-package-dev-map "g"    #'ess-r-devtools-install-github)
    (define-key ess-r-package-dev-map "\C-i" #'ess-r-devtools-install-package)
    (define-key ess-r-package-dev-map "i"    #'ess-r-devtools-install-package)
    (define-key ess-r-package-dev-map "\C-l" #'ess-r-devtools-load-package)
    (define-key ess-r-package-dev-map "l"    #'ess-r-devtools-load-package)
    (define-key ess-r-package-dev-map "\C-t" #'ess-r-devtools-test-package)
    (define-key ess-r-package-dev-map "t"    #'ess-r-devtools-test-package)
    (define-key ess-r-package-dev-map "\C-u" #'ess-r-devtools-unload-package)
    (define-key ess-r-package-dev-map "u"    #'ess-r-devtools-unload-package)
    ess-r-package-dev-map))

(easy-menu-define ess-roxygen-menu nil
  "Roxygen submenu."
  '("Roxygen"
    :visible (and ess-dialect (string-match "^R" ess-dialect))
    ["Update/Generate Template" ess-roxy-update-entry           t]
    ["Preview Rd"        ess-roxy-preview-Rd                    t]
    ["Preview HTML"      ess-roxy-preview-HTML                  t]
    ["Preview text"      ess-roxy-preview-text                  t]
    ["Hide all"          ess-roxy-hide-all                      t]
    ["Toggle Roxygen Prefix"     ess-roxy-toggle-roxy-region    t]))

(easy-menu-define ess-tracebug-menu nil
  "Tracebug submenu."
  '("Tracebug"
    :visible (and ess-dialect (string-match "^R" ess-dialect))
    ;; :enable ess-local-process-name
    ["Active?"  ess-toggle-tracebug
     :style toggle
     :selected (or (and (ess-process-live-p)
                        (ess-process-get 'tracebug))
                   ess-use-tracebug)]
    ["Show traceback" ess-show-traceback (ess-process-live-p)]
    ["Show call stack" ess-show-call-stack (ess-process-live-p)]
    ["Watch" ess-watch  (and (ess-process-live-p)
                             (ess-process-get 'tracebug))]
    ["Error action cycle" ess-debug-toggle-error-action (and (ess-process-live-p)
                                                             (ess-process-get 'tracebug))]
    "----"
    ["Flag for debugging" ess-debug-flag-for-debugging ess-local-process-name]
    ["Unflag for debugging" ess-debug-unflag-for-debugging ess-local-process-name]
    "----"
    ["Set BP" ess-bp-set t]
    ["Set conditional BP" ess-bp-set-conditional t]
    ["Set logger BP" ess-bp-set-logger t]
    ["Kill BP" ess-bp-kill t]
    ["Kill all BPs" ess-bp-kill-all t]
    ["Next BP" ess-bp-next t]
    ["Previous BP" ess-bp-previous t]
    "-----"
    ["About" ess-tracebug-show-help t]))

(easy-menu-define ess-r-package-menu nil
  "Package Development submenu."
  '("Package development"
    :visible (and ess-dialect (string-match "^R" ess-dialect))
    ["Active?" ess-r-package-mode
     :style toggle
     :selected ess-r-package-mode]
    ["Select package for evaluation" ess-r-set-evaluation-env t]))

(easy-menu-add-item ess-mode-menu nil ess-roxygen-menu "end-dev")
(easy-menu-add-item ess-mode-menu nil ess-r-package-menu "end-dev")
(easy-menu-add-item ess-mode-menu nil ess-tracebug-menu "end-dev")
(easy-menu-add-item inferior-ess-mode-menu nil ess-r-package-menu "end-dev")
(easy-menu-add-item inferior-ess-mode-menu nil ess-tracebug-menu "end-dev")

(defvar ess-r-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-c C-=") #'ess-cycle-assign)
    (define-key map "\M-?" #'ess-complete-object-name)
    (define-key map (kbd "C-c C-.") 'ess-rutils-map)
    map))

(defvar ess-r-mode-syntax-table
  (let ((table (copy-syntax-table S-syntax-table)))
    ;; Letting Emacs treat backquoted names and %ops% as strings solves
    ;; many problems with regard to nested strings and quotes
    (modify-syntax-entry ?` "\"" table)
    (modify-syntax-entry ?% "\"" table)
    ;; Underscore is valid in R symbols
    (modify-syntax-entry ?_ "_" table)
    (modify-syntax-entry ?: "." table)
    (modify-syntax-entry ?@ "." table)
    (modify-syntax-entry ?$ "." table)
    (modify-syntax-entry ?\\ "." table)
    table)
  "Syntax table for `ess-r-mode'.")

(defvar ess-r-completion-syntax-table
  (let ((table (copy-syntax-table ess-r-mode-syntax-table)))
    (modify-syntax-entry ?. "_" table)
    (modify-syntax-entry ?: "_" table)
    (modify-syntax-entry ?$ "_" table)
    (modify-syntax-entry ?@ "_" table)
    table)
  "Syntax table used for completion and help symbol lookup.
It makes underscores and dots word constituent chars.")

(defvar ess-r-namespaced-load-verbose t
  "Whether to display information on namespaced loading.
When t, loading a file into a namespaced will output information
about which objects are exported and which stay hidden in the
namespace.")

;; The syntax class for '\' is punctuation character to handle R 4.1
;; lambdas. Inside strings it should be treated as an escape
;; character which we ensure here.
(defun ess-r--syntax-propertize-backslash ()
  (when (nth 3 (save-excursion (syntax-ppss (1- (point)))))
    (string-to-syntax "\\")))

;; Adapted from `python-syntax-stringify'
(defun ess-r--syntax-propertize-raw-string-opening ()
  (let* ((raw-beg (match-beginning 0))
         (quote-beg (1+ raw-beg))
         (ppss (save-excursion (goto-char raw-beg) (syntax-ppss)))
         (string-start (and (eq t (nth 3 ppss)) (nth 8 ppss))))
    (cond
     ;; Inside a comment
     ((nth 4 ppss)
      nil)
     ;; This set of quotes delimits the start of a string
     ((null string-start)
      (put-text-property quote-beg (1+ quote-beg)
                         'syntax-table (string-to-syntax "|"))))))

(defun ess-r--syntax-propertize-raw-string-closing ()
  (let* ((quote-end (match-end 0))
         (quote-chr (aref (match-string 3) 0))
         (dashes (match-string 2))
         (matching-delim (pcase (match-string 1)
                           (`")" ?\() (`"}" ?{) (`"]" ?\[)))
         (ppss (save-excursion (goto-char quote-end) (syntax-ppss)))
         (string-start (and (eq t (nth 3 ppss)) (nth 8 ppss))))
    (when string-start
      (save-match-data
        (save-excursion
          (goto-char string-start)
          (when (equal (char-after) quote-chr)
            (forward-char)
            (re-search-forward "-*" nil t)
            (let ((matching-dashes (match-string 0)))
              (when (or (not matching-dashes)
                        (string= matching-dashes dashes))
                (when (equal (char-after) matching-delim)
                  (put-text-property (1- quote-end) quote-end
                                     'syntax-table (string-to-syntax "|")))))))))))

(defconst ess-r--syntax-propertize-function
  (syntax-propertize-rules
   ("[rR]\\([\"']\\)\\(-*\\)\\([([{]\\)"
    (0 (ignore (ess-r--syntax-propertize-raw-string-opening))))
   ("\\([])}]\\)\\(-*\\)\\([\"']\\)"
    (0 (ignore (ess-r--syntax-propertize-raw-string-closing))))
   ("\\\\"
    (0 (ess-r--syntax-propertize-backslash)))))

(defun ess-r-font-lock-syntactic-face-function (state)
  (if (nth 3 state)
      ;; string case
      (let ((string-end (save-excursion
                          (ess-goto-char (nth 8 state))
                          (ess-forward-sexp)
                          (point))))
        (cond
         ((eq (nth 3 state) ?%)
          (if (eq (point) (1- string-end))
              (when (cdr (assq 'ess-fl-keyword:operators ess-R-font-lock-keywords))
                'ess-operator-face)
            (if (cdr (assq 'ess-R-fl-keyword:%op% ess-R-font-lock-keywords))
                'ess-%op%-face
              nil)))
         ((save-excursion
            (and (cdr (assq 'ess-R-fl-keyword:fun-defs ess-R-font-lock-keywords))
                 (ess-goto-char string-end)
                 (ess-looking-at "<-")
                 (ess-goto-char (match-end 0))
                 (ess-looking-at "function\\b\\|\\\\" t)))
          font-lock-function-name-face)
         ((save-excursion
            (and (cdr (assq 'ess-fl-keyword:fun-calls ess-R-font-lock-keywords))
                 (ess-goto-char string-end)
                 (ess-looking-at "(")))
          ess-function-call-face)
         ((eq (nth 3 state) ?`)
          nil)
         (t
          font-lock-string-face)))
    font-lock-comment-face))

;; Don't fontify backquoted symbols as strings
(defun inferior-ess-r-font-lock-syntactic-face-function (state)
  (if (nth 3 state)
      (if (eq (nth 3 state) ?`)
          nil
        font-lock-string-face)
    font-lock-comment-face))

(defvar ess-r--non-fn-kwds
  '("in" "else" "break" "next" "repeat")
  "Reserved words that should not be treated as names of special
functions by `ess-r--find-fl-keyword'; such reserved words do
not need to be followed by an open parenthesis to trigger
font-locking.
See also `ess-r--non-fn-kstrs'.")

(defvar ess-r--non-fn-kstrs
  '("\?")
  "Reserved non-word strings that should not be treated as names of
special functions by `ess-r--find-fl-keyword'; such reserved
strings do not need to be followed by an open parenthesis to
trigger font-locking.
See also `ess-r--non-fn-kwds'.")

(defvar-local ess-r--keyword-regexp nil)
(defun ess-r--find-fl-keyword (limit)
  "Search for R keyword or keystring and set the match data.
To be used as part of `font-lock-defaults' keywords."
  (unless ess-r--keyword-regexp
    (let (fn-kwds non-fn-kwds fn-kstrs non-fn-kstrs)
      (dolist (kw ess-R-keywords)
        (if (member kw ess-r--non-fn-kwds)
            (push kw non-fn-kwds)
          (push kw fn-kwds)))
      (dolist (kw ess-r--keystrings)
	(if (member kw ess-r--non-fn-kstrs)
	    (push kw non-fn-kstrs)
	  (push kw fn-kstrs)))
      (setq ess-r--keyword-regexp
            (concat "\\("
                    (regexp-opt non-fn-kwds 'words)
                    "\\|"
                    (regexp-opt non-fn-kstrs t)
                    "\\)\\|\\("
                    (regexp-opt fn-kwds 'words)
                    "\\|"
                    (regexp-opt fn-kstrs t)
                    "\\)"))))
  (let (out)
    (while (and (not out)
                (re-search-forward ess-r--keyword-regexp limit t))
      (save-match-data
        (setq out (if (match-beginning 1)
                      ;; Non-function-like keywords: Always fontified
                      ;; except for `in` for which we check it's part
                      ;; of a `for` construct. Ideally we'd check that
                      ;; other keywords like `break` or `next` are
                      ;; part of the right syntactic construct but
                      ;; that requires robust and efficient detection
                      ;; of complete expressions.
                      (if (string= (match-string 1) "in")
                          (save-excursion
                            (goto-char (match-beginning 1))
                            (and (ess-backward-up-list)
                                 (forward-word -1)
                                 (looking-at "for\\s-*(")))
                        t)
                    ;; Function-like keywords: check if they are
                    ;; followed by an open paren
                    (looking-at "\\s-*(")))))
    out))

(define-obsolete-variable-alias 'R-customize-alist 'ess-r-customize-alist "ESS 18.10.2")
(defvar ess-r-customize-alist
  (append
   '((ess-local-customize-alist             . 'ess-r-customize-alist)
     (ess-dialect                           . "R")
     (ess-suffix                            . "R")
     (ess-traceback-command                 . ess-r-traceback-command)
     (ess-call-stack-command                . ess-r-call-stack-command)
     (ess-mode-completion-syntax-table      . ess-r-completion-syntax-table)
     (ess-build-eval-message-function       . #'ess-r-build-eval-message)
     (ess-dump-filename-template            . ess-r-dump-filename-template)
     (ess-change-sp-regexp                  . ess-r-change-sp-regexp)
     (ess-help-sec-regex                    . ess-help-r-sec-regex)
     (ess-help-sec-keys-alist               . ess-help-r-sec-keys-alist)
     (ess-function-pattern                  . ess-r-function-pattern)
     (ess-object-name-db-file               . "ess-r-namedb.el")
     (ess-smart-operators                   . ess-r-smart-operators)
     (inferior-ess-program                  . inferior-ess-r-program)
     (inferior-ess-objects-command          . inferior-ess-r-objects-command)
     (inferior-ess-search-list-command      . "search()\n")
     (inferior-ess-help-command             . inferior-ess-r-help-command)
     (inferior-ess-exit-command             . "q()")
     (ess-error-regexp-alist                . ess-r-error-regexp-alist)
     (ess-describe-object-at-point-commands . 'ess-r-describe-object-at-point-commands)
     (ess-STERM                             . "iESS")
     (ess-editor                            . ess-r-editor)
     (ess-pager                             . ess-r-pager))
   S-common-cust-alist)
  "Variables to customize for R.")

(cl-defmethod ess-build-tags-command (&context (ess-dialect "R"))
  "Return tags command for R."
  "rtags('%s', recursive = TRUE, pattern = '\\\\.[RrSs](rw)?$',ofile = '%s')")

(defvar ess-r-traceback-command
  "local({cat(geterrmessage(), \
'---------------------------------- \n', \
fill=TRUE); try(traceback(), silent=TRUE)})\n")

(defvar ess-r-call-stack-command "traceback(1)\n")

(defun ess-r-format-command (cmd &rest args)
  (let ((sentinel (alist-get 'output-delimiter args)))
    (ess-r--format-call ".ess.command(local(%s), '%s')\n" cmd sentinel)))

(defvar ess-r-format-command-alist
  '((fun           . ess-r-format-command)
    (use-delimiter . t)))

(defvar ess-r-dump-filename-template
  (replace-regexp-in-string
   "S$" "R" ess-dump-filename-template-proto))

(defvar ess-r-ac-sources
  '(ac-source-R))

(defvar ess-r-company-backends
  '((company-R-library company-R-args company-R-objects :separate)))

(defconst ess-help-r-sec-regex "^[A-Z][A-Za-z].+:$"
  "Reg(ular) Ex(pression) of section headers in help file.")

(defconst ess-help-r-sec-keys-alist
  '((?a . "\\s *Arguments:")
    (?d . "\\s *Description:")
    (?D . "\\s *Details:")
    (?t . "\\s *Details:")
    (?e . "\\s *Examples:")
    (?n . "\\s *Note:")
    (?r . "\\s *References:")
    (?s . "\\s *See Also:")
    (?u . "\\s *Usage:")
    (?v . "\\s *Value[s]?")     ;
    )
  "Alist of (key . string) pairs for use in help section searching.")

(defvar ess-r-error-regexp-alist '(R R1 R2 R3 R4 R-rlang R-recover)
  "List of symbols which are looked up in `compilation-error-regexp-alist-alist'.")

(dolist (l '(;; Takes precedence over R1 below in English locales, and allows spaces in file path
             (R "\\(\\(?: at \\|(@\\)\\([^#()\n:]+\\)[#:]\\([0-9]+\\)\\)"  2 3 nil 2 1)
             ;; valgrind, testthat, rlang/shiny style
             ;; e.g. (stl_numeric.h:183), (test-parsers.R:238:3) [.../R/file.R#158]
             (R1 "\\s(\\([^0-9][^ ():\n]+\\)[#:]\\([0-9]+\\)[#:]?\\([0-9]+\\)?\\s)" 1 2 nil 2)
             (R2 "(\\(\\w+ \\([^())\n]+\\)#\\([0-9]+\\)\\))"  2 3 nil 2 1)
             ;; Precedes R4 and allows spaces in file path, Starts at bol or with ": " (patterns 3,4,5,6,9)
             (R3 "\\(?:^ *\\|: ?\\)\\([^-+[:digit:] \t\n]:?[^: \t\n]*\\):\\([0-9]+\\):\\(?:\\([0-9]+\\):\\)?"  1 2 3 2 1)
             ;; Don't start with digit; no spaces
             (R4 "\\([^-+ [:digit:]][^: \t\n]+\\):\\([0-9]+\\):\\([0-9]+\\):"  1 2 3 2 1)
             (R-rlang "^ *[0-9]+\\..* \\(\\([^ :]+\\):\\([0-9]+\\):\\([0-9]+\\)\\)$" 2 3 4 nil 1)
             (R-recover " *[0-9]+: +\\([^:\n\t]+?\\)#\\([0-9]+:\\)"  1 2 nil 2 1)))
  (cl-pushnew l compilation-error-regexp-alist-alist))

(define-obsolete-variable-alias 'ess-r-versions-created 'ess-r-created-runners "ESS 18.10")
(defvar ess-r-created-runners nil
  "List of R-versions found from `ess-r-runner-prefixes' on the system.")


;;;*;;; Mode init

(define-obsolete-variable-alias 'ess-R-post-run-hook 'ess-r-post-run-hook "ESS 18.10.2")

;; We moved the set-wd instruction from `inferior-ess' to here to
;; avoid sending R code to gdb or lldb before we had a chance to
;; send "run". So this is no longer generic and inferior modes need
;; to call this manually. One way to fix this would be to make
;; `inferior-ess' a `cl-defgeneric'.
(defvar ess-r-post-run-hook nil
  "Functions run in process buffer after the initialization of R process.
Make sure to call blocking commands (e.g. based on `ess-command')
first. Streaming commands (e.g. based on `ess-send-string')
should come last, otherwise they will make R busy and the
blocking commands will throw an error.")

;;;###autoload
(defun run-ess-r (&optional start-args)
  "Call 'R', the 'GNU S' system from the R Foundation.
Optional prefix (\\[universal-argument]) allows to set command line arguments, such as
--vsize.  This should be OS agnostic.
If you have certain command line arguments that should always be passed
to R, put them in the variable `inferior-R-args'.

START-ARGS can be a string representing an argument, a list of
such strings, or any other non-nil value.  In the latter case, you
will be prompted to enter arguments interactively."
  (interactive "P")
  (ess-write-to-dribble-buffer   ;; for debugging only
   (format
    "\n(R): ess-dialect=%s, buf=%s, start-arg=%s\n current-prefix-arg=%s\n"
    ess-dialect (current-buffer) start-args current-prefix-arg))
  (unless (or (file-remote-p default-directory)
              (when ess-startup-directory
                (file-remote-p (if (symbolp ess-startup-directory)
                                   (symbol-value ess-startup-directory)
                                 ess-startup-directory)))
              ;; TODO: Once we drop Emacs 26 support, can probably
              ;; just use the REMOTE argument of `executable-find'.
              (executable-find inferior-ess-r-program))
    (display-warning 'ess (format "%s could not be found on the system. Try running `run-ess-r-newest' instead, which searches your system for R." inferior-ess-r-program) :error)
    (user-error "%s program not found" inferior-ess-r-program))
  (let* ((r-always-arg
          (if (or ess-microsoft-p (eq system-type 'cygwin))
              "--ess "
            ;; else: "Unix alike"
            (if (not ess-R-readline) "--no-readline ")))
         (start-args
          (cond ((stringp start-args)
                 start-args)
                ((and start-args
                      (listp start-args)
                      (cl-every #'stringp start-args))
                 (mapconcat #'identity start-args " "))
                (start-args
                 (read-string
                  (concat "Starting Args"
                          (if r-always-arg
                              (concat " [other than '" r-always-arg "']"))
                          " ? ")))))
         (r-start-args
          (concat r-always-arg
                  inferior-R-args " "   ; add space just in case
                  start-args))
         (debug (string-match-p " -d \\| --debugger=" r-start-args))
         use-dialog-box)
    (when (or ess-microsoft-p
              (eq system-type 'cygwin))
      (setq use-dialog-box nil)
      (when ess-microsoft-p ;; default-process-coding-system would break UTF locales on Unix
        (setq default-process-coding-system '(undecided-dos . undecided-dos))))

    (let ((inf-buf (inferior-ess r-start-args ess-r-customize-alist debug)))
      (with-current-buffer inf-buf
        (ess-process-put 'funargs-pre-cache ess-r--funargs-pre-cache)
        (if debug
            (progn
              ;; We need to use callback, because R might start with a gdb process
              (ess-process-put 'callbacks '(inferior-ess-r--init-callback))
              ;; Trigger the callback
              (process-send-string (get-buffer-process inf-buf) "r\n"))
          (ess-r-initialize)
          (comint-goto-process-mark)))
      inf-buf)))

;;;###autoload
(defun R (&optional start-args)
  (interactive "P")
  ;; FIXME: Current ob-R expects current buffer set to process buffer
  (set-buffer (run-ess-r start-args)))

(defun inferior-ess-r--init-callback (_proc _name)
  (ess-r-initialize))

(defvar ess-r--init-timeout 5
  "Maximum time for R to become available on startup.
If the timeout is reached, an error is thrown advising the user
to run `ess-r-initialize' again.")

(define-obsolete-function-alias 'R-initialize-on-start
  #'ess-r-initialize "ESS 19.04")

(defun ess-r-initialize ()
  "This function is run after the first R prompt.
Executed in process buffer."
  (interactive)
  (condition-case err
      (progn
        (unless (ess-wait-for-process nil nil nil nil ess-r--init-timeout)
          (error "Process is busy"))
        (ess-command (ess-r--init-options-command))
        (ess-r-load-ESSR))
    (error (ess-r--init-error-handler err))
    (quit (ess-r--init-error-handler)))
  (ess-process-put 'format-command-alist ess-r-format-command-alist)
  (ess-process-put 'bg-eval-disabled nil)
  (ess-execute-screen-options t)
  (ess-set-working-directory default-directory)
  (when ess-use-tracebug
    (ess-tracebug 1))
  (add-hook 'ess-presend-filter-functions #'ess-R-scan-for-library-call nil 'local)
  ;; Wait before running user hook so they can call blocking commands
  (ess-wait-for-process)
  (run-hooks 'ess-r-post-run-hook)
  (ess-wait-for-process))

(defun ess-r--init-error-handler (&optional err)
  (ess-write-to-dribble-buffer "Failed to start ESSR\n")
  (when-let ((proc (and ess-local-process-name
                        (get-process ess-local-process-name))))
    (process-put proc 'bg-eval-disabled t))
  (let ((msgs `("ESSR failed to start, please call `ess-r-initialize' to recover"
                ,@(when err
                    (concat "Caused by error: " (error-message-string err))))))
    (error (mapconcat 'identity msgs "\n"))))

;; FIXME: Should we stop setting `str.dendogram.last`? See:
;; https://emacs.stackexchange.com/questions/27673/ess-dendrograms-appearance-of-last-branch/27729#27729
;;
;; FIXME: We don't use `ess-r-pager`? It's nil by default and
;; documented that this should not normally be set
(defun ess-r--init-options-command ()
  (let ((args (list (format "STERM = '%s'" ess-STERM)
                    "str.dendrogram.last = '\\''"
                    (format "editor = '%s'" ess-r-editor)
                    (ess-r--update-opt-if-eq "pager"
                                             "file.path(R.home(), 'bin', 'pager')"
                                             (format "'%s'" inferior-ess-pager))
                    "show.error.locations = TRUE")))
    (format "options(%s)\n" (mapconcat 'identity args ", "))))

(defun ess-r--update-opt-if-eq (opt old new)
  (let ((actual (format "getOption('%s')" opt)))
    (format "%s = if (identical(%s, %s)) %s else %s"
            opt
            actual
            old
            new
            actual)))

(defun ess-r--skip-function ()
  ;; Assumes the point is at function start
  (if (looking-at-p ess-r-set-function-start)
      (forward-list 1) ; get over the entire setXyz(...)
    (forward-list 1) ; get over arguments
    (if (looking-at-p "[ \t\n]*{")
        (forward-sexp 1) ;; move over {...}
      ;; {..}-less case
      (skip-chars-forward " \t\n")
      (goto-char (cadr (ess-continuations-bounds))))))

;; `beginning-of-defun' protocol:
;;  1) assumes that defuns are at the top level (e.g. always moves to bol)
(defun ess-r-beginning-of-defun (&optional arg)
  "Move to beginning a top level function.
ARG is as in `beginning-of-defun'."
  (ess-r-beginning-of-function arg t))

;; `end-of-defun' protocol:
;;  1) Uses beginning-of-defun-function with negative arg
;;  2) Assumes that beginning-of-defun-function with -1 arg finds current defun
;;  when point is just in front of the function
(defun ess-r-end-of-defun (&optional arg)
  "End of top level function.
ARG is as in `end-of-defun'."
  (ess-r-end-of-function arg t))

(defun ess-r-beginning-of-function (&optional arg top-level)
  "Leave (and return) the point at the beginning of the current ESS function.
When ARG is positive, search for beginning of function backward,
otherwise forward. Value of ARG is currently ignored. Return the
new position, or nil if no-match. If TOP-LEVEL is non-nil, search
for top-level functions only."
  (setq arg (or arg 1))
  (let ((start-point (point))
        done)
    ;; In case we are at the start of a function, skip past new lines.
    (when (> arg 0)
      ;; Start search from a forward position in order to capture current
      ;; function start. But not when arg < 0; see end-of-defun protocol above.
      (forward-line 2))
    (while (and (not done)
                (re-search-backward ess-r-function-pattern nil t arg))
      (unless (ess-inside-string-or-comment-p)
        (setq done
              (if top-level
                  (= (car (syntax-ppss (match-beginning 0))) 0)
                t))
        (if (< arg 0)
            ;; move to match-end to avoid the infloop in re-search-backward
            (goto-char (if done (match-beginning 0) (match-end 0)))
          ;; Backward regexp match stops at the minimal match (e.g. partial
          ;; function name), so we need a bit more work here.
          (beginning-of-line)
          (re-search-forward ess-r-function-pattern)
          (goto-char (match-beginning 0))
          (when (<= start-point (point))
            (setq done nil)))))
    (if done
        (point)
      (goto-char start-point)
      nil)))

(defun ess-r-end-of-function (&optional arg top-level)
  "Leave the point at the end of the current function.
When ARG is positive, search for end of function forward,
otherwise backward. Move to point and return point if search was
successful, otherwise nil. If TOP-LEVEL is non-nil, search for
top level functions only."
  (setq arg (or arg 1))
  (let* ((start-pos (point))
         (search-fn (lambda (lim)
                      (let ((foundp nil))
                        (while (and (not foundp)
                                    (re-search-forward ess-r-function-pattern nil t))
                          (when (< arg 0)
                            ;; re-search-backward is a forward search
                            ;; internally, so we need to bol in order to avoid
                            ;; the infloop
                            (beginning-of-line))
                          (setq foundp
                                (unless (ess-inside-string-or-comment-p)
                                  (if top-level
                                      (= 0 (car (save-excursion (syntax-ppss (match-beginning 0)))))
                                    (>= (point) lim)))))
                        (if foundp
                            (progn (goto-char (match-beginning 0))
                                   (ess-r--skip-function))
                          (goto-char start-pos))))))
    (ess-r-beginning-of-function 1 top-level)
    (if (< (point) start-pos)
        ;; Moved back. We were either inside a function or after a function.
        (progn
          (ess-r--skip-function)
          ;; For negative ARG we are done.
          (when (and (> arg 0)
                     (<= (point) start-pos))
            (funcall search-fn start-pos)))
      ;; No function before point; search forward on positive ARG.
      (when (> arg 0)
        (funcall search-fn start-pos)))))

;;;###autoload
(define-derived-mode ess-r-mode ess-mode "ESS[R]"
  "Major mode for editing R source.  See `ess-mode' for more help."
  :group 'ess-R
  (set-syntax-table ess-r-mode-syntax-table)
  (ess-setq-vars-local ess-r-customize-alist)
  (setq-local ess-font-lock-keywords 'ess-R-font-lock-keywords)
  (setq-local paragraph-start (concat "\\s-*$\\|" page-delimiter))
  (setq-local paragraph-separate (concat "\\s-*$\\|" page-delimiter))
  (setq-local paragraph-ignore-fill-prefix t)
  (setq-local indent-line-function #'ess-r-indent-line)
  (setq-local comment-indent-function #'ess-calculate-indent)
  (setq-local add-log-current-defun-header-regexp "^\\(.+\\)\\s-+<-[ \t\n]*function")
  (setq-local font-lock-syntactic-face-function #'ess-r-font-lock-syntactic-face-function)
  (setq-local syntax-propertize-function ess-r--syntax-propertize-function)
  (setq-local electric-layout-rules '((?{ . after)))
  ;; indentation
  (add-hook 'hack-local-variables-hook #'ess-set-style nil t)
  ;; eldoc
  (ess--setup-eldoc #'ess-r-eldoc-function)
  ;; auto-complete
  (ess--setup-auto-complete ess-r-ac-sources)
  ;; company
  (ess--setup-company ess-r-company-backends)
  (setq-local prettify-symbols-alist ess-r-prettify-symbols)
  (setq font-lock-defaults '(ess-build-font-lock-keywords nil nil ((?\. . "w") (?\_ . "w"))))
  (remove-hook 'completion-at-point-functions #'ess-filename-completion 'local) ;; should be first
  (add-hook 'completion-at-point-functions #'ess-r-object-completion nil 'local)
  (add-hook 'completion-at-point-functions #'ess-r-package-completion nil 'local)
  (add-hook 'completion-at-point-functions #'ess-filename-completion nil 'local)
  (add-hook 'xref-backend-functions #'ess-r-xref-backend nil 'local)
  (add-hook 'project-find-functions #'ess-r-project nil 'local)

  (if (fboundp 'ess-add-toolbar) (ess-add-toolbar))
  ;; imenu is needed for `which-function'
  (setq imenu-generic-expression ess-imenu-S-generic-expression)
  (when ess-imenu-use-S
    (imenu-add-to-menubar "Imenu-R"))
  (setq-local beginning-of-defun-function #'ess-r-beginning-of-defun)
  (setq-local end-of-defun-function #'ess-r-end-of-defun)
  (ess-roxy-mode))
;;;###autoload
(defalias 'R-mode #'ess-r-mode)
;;;###autoload
(defalias 'r-mode #'ess-r-mode)


;;;###autoload
(add-to-list 'auto-mode-alist '("/R/.*\\.q\\'" . ess-r-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.[rR]\\'" . ess-r-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.[rR]profile\\'" . ess-r-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("NAMESPACE\\'" . ess-r-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("CITATION\\'" . ess-r-mode))


;;;*;;; Project detection

(defvar-local ess-r-project--info-cache nil
  "Current package info cache.
See `ess-r-project-info' for its structure.")

(defun ess-r-project (&optional dir)
  "Return the current project as an Emacs project instance.
R project is a directory XYZ containing either .Rprofile,
DESCRIPTION or XYZ.Rproj file. Return a list of the form (:name
\"XYZ\" :root \"/path/to/project\"). If DIR is provided, the
project is searched from that directory instead of
`default-directory'."
  (let ((info (ess-r-project-info dir)))
    (when (car info)
      (cons 'ess-r-project (plist-get info :root)))))

;; FIXME: remove when emacs 27 is dropped
(unless (eval-when-compile
          (get 'project-roots 'byte-obsolete-info))
  (cl-defmethod project-roots ((project (head ess-r-project)))
    "Return the project root for ESS R projects."
    (list (cdr project))))

(cl-defmethod project-root ((project (head ess-r-project)))
  "Return the project root for ESS R projects."
  (cdr project))

(defun ess-r-project-info (&optional dir)
  "Get the description of the R project in directory DIR.
Return an plist with the keys :name and :root. When not in a
project return \\='(nil). This value is cached buffer-locally for
efficiency reasons."
  (let ((do-cache (null dir)))
    (if (and do-cache ess-r-project--info-cache)
        ess-r-project--info-cache
      (setq dir (or dir (buffer-file-name) default-directory))
      (let ((out (or
                  (unless (file-remote-p dir)
                    (let ((dir (locate-dominating-file
                                dir
                                (lambda (dir)
                                  (or (file-exists-p (expand-file-name ".Rprofile" dir))
                                      (file-exists-p (expand-file-name "DESCRIPTION" dir))
                                      (let ((nm (file-name-nondirectory (directory-file-name dir))))
                                        (file-exists-p (expand-file-name (concat nm ".Rproj") dir))))))))
                      (when dir
                        (let ((dir (directory-file-name dir)))
                          (unless (member dir (list "~" (getenv "HOME")))
                            (list :name (file-name-nondirectory dir)
                                  :root (expand-file-name dir)))))))
                  '())))
        (when do-cache
          (setq ess-r-project--info-cache out))
        out))))



;;*;; Miscellaneous

(defun ess-R-arch-2-bit (arch)
  "Translate R's architecture shortcuts/directory names to `bits'.
ARCH \"32\" or \"64\" (for now)."
  (if (string= arch "i386")  "32"
    ;; else:
    "64"))

(defun ess-rterm-arch-version (long-path &optional give-cons)
  "Find a name for LONG-PATH, an absolute path to R on Windows.
Returns either Name, a string, or a (Name . Path) cons, such as

(\"R-2.12.1-64bit\"  .  \"C:/Program Files/R/R-2.12.1/bin/x64/Rterm.exe\")

\"R-x.y.z/bin/Rterm.exe\" will return \"R-x.y.z\", for R-2.11.x and older.
\"R-x.y.z/bin/i386/Rterm.exe\" return \"R-x.y.z-32bit\", for R-2.12.x and newer.
\"R-x.y.z/bin/x64/Rterm.exe\"  return \"R-x.y.z-64bit\", for R-2.12.x and newer."
  (let* ((dir  (directory-file-name (file-name-directory long-path)))
         (dir2 (directory-file-name (file-name-directory dir)))
         (v-1up (file-name-nondirectory dir));; one level up
         (v-2up (file-name-nondirectory dir2));; two levels up; don't want "bin" ...
         (v-3up (file-name-nondirectory ;; three levels up; no "bin" for i386, x64 ...
                 (directory-file-name (file-name-directory dir2))))
         (val (if (string= v-2up "bin")
                  (concat v-3up "-" (ess-R-arch-2-bit v-1up) "bit")
                ;; pre R-2.12.x, or when there's no extra arch-specific sub directory:
                v-2up)))
    (if give-cons
        (cons val long-path)
      val)))

(defun ess-r-define-runners (&optional verbose)
  "Generate functions for starting other versions of R.
See `ess-r-runner-prefixes' for strings that determine which functions
are created.  On MS Windows, this works using
`ess-rterm-version-paths' instead.

The functions will normally be placed on the menubar and stored
as `ess-r-created-runners' upon ESS initialization."
  (when ess-r-runner-prefixes
    (let ((versions
           ;; Find which versions of R we want.  Remove the pathname, leaving just
           ;; the name of the executable.
           (if ess-microsoft-p
               (mapcar (lambda (v) (car (ess-rterm-arch-version v 'give-cons)))
                       ess-rterm-version-paths)
             (delete-dups
              (mapcar #'file-name-nondirectory
                      (apply #'nconc
                             (mapcar #'ess-find-exec-completions
                                     ess-r-runner-prefixes)))))))
      ;; Iterate over each string in VERSIONS, creating a new defun each time.
      (setq ess-r-created-runners versions)
      (if verbose
        (message "Recreated %d R versions known to ESS: %s"
                 (length versions) versions))
      (if ess-microsoft-p
          (cl-mapcar (lambda (v p) (ess-define-runner v "R" p)) versions ess-rterm-version-paths)
        (mapc (lambda (v) (ess-define-runner v "R")) versions))
      ;; Add to menu
      (when ess-r-created-runners
        ;; new-menu will be a list of 3-vectors, of the form:
        ;; ["R-1.8.1" R-1.8.1 t]
        (let ((new-menu (mapcar (lambda(x) (vector x (intern x) t))
                                ess-r-created-runners)))
          (easy-menu-add-item ess-mode-menu '("Start Process")
                              (cons "Other" new-menu))
          (easy-menu-add-item inferior-ess-mode-menu '("Process")
                              (cons "R processes" new-menu)))))))

(defun ess-r-redefine-runners (&optional verbose)
  "Regenerate runners, i.e. `M-x R-*` possibilities.
 Call `fmakunbound' on all elements of `ess-r-created-runners',
 then define new runners."
  (interactive "P")
  (dolist (f ess-r-created-runners)
    (fmakunbound (intern f)))
  (setq ess-r-created-runners nil)
  (ess-r-define-runners verbose))

(defun ess-r-runners-reset (sym val)
  "Regenerate runners.
Set SYM to VAL and call `ess-r-redefine-runners'."
  (set-default sym val)
  (ess-r-redefine-runners))

(define-obsolete-function-alias
  'ess-r-versions-create #'ess-r-define-runners "ESS 18.10")

(defvar ess-newest-R nil
  "Stores the newest version of R that has been found.
Used as a cache, within `ess-find-newest-R'. Do not use this value
directly, but instead call the function \\[ess-find-newest-R].")


(defcustom ess-prefer-higher-bit t
  "Non-nil means prefer higher bit architectures of R.
e.g. prefer 64 bit over 32 bit.  This is currently used only
by the code on Windows for finding the newest version of R."
  :group 'ess-R
  :type 'boolean)

(defun ess-rterm-prefer-higher-bit ()
  "Optionally remove 32bit Rterms from being candidate for `run-ess-r-newest'.
Return the list of candidates for being `run-ess-r-newest'. Filtering is
done iff `ess-prefer-higher-bit' is non-nil. This is used only by
Windows when running `ess-find-newest-R'."
  (if ess-prefer-higher-bit
      ;; filter out 32 bit elements
      (let ((filtered
             (delq nil
                   (mapcar (lambda (x) (unless (string-match "/i386/Rterm.exe" x) x))
                           ess-rterm-version-paths))))
        (if (null filtered)
            ;; if none survived filtering, keep the original list
            ess-rterm-version-paths
          filtered))
    ess-rterm-version-paths))

(defun run-ess-r-newest (&optional start-args)
  "Find the newest version of R available, and run it.
Subsequent calls to `run-ess-r-newest' will run that version,
rather than searching again for the newest version. Providing
START-ARGS (interactively, with \\[universal-argument]) will
prompt for command line arguments."
  (interactive "P")
  (unless ess-newest-R
    (message "Finding all versions of R on your system...")
    (setq ess-newest-R
          (ess-find-newest-date
           (mapcar #'ess-r-version-date
                   (if ess-microsoft-p
                       (ess-rterm-prefer-higher-bit)
                     (add-to-list 'ess-r-created-runners inferior-ess-r-program))))))
  (let ((inferior-ess-r-program ess-newest-R))
    (run-ess-r start-args)))

(defun R-newest (&optional start-args)
  (interactive "P")
  ;; FIXME: Current ob-R expects current buffer set to process buffer
  (set-buffer (run-ess-r-newest start-args)))

;; (ess-r-version-date "R-2.5.1") (ess-r-version-date "R-patched")
;; (ess-r-version-date "R-1.2.1") (ess-r-version-date "R-1.8.1")
;; Windows:
;;  (ess-r-version-date "C:/Program Files (x86)/R/R-2.11.1/bin/Rterm.exe")
;; Note that for R-devel, ver-string is something like
;; R version 2.6.0 Under development (unstable) (2007-07-14 r42234)
;; Antique examples are 'R 1.0.1  (April 14, 2000)' or 'R 1.5.1 (2002-06-17).'
(defun ess-r-version-date (rver)
  "Return the date of the version of R named RVER.
The date is returned as a date string.  If the version of R could
not be found from the output of the RVER program, \"-1\" is
returned."
  (let ((date "-1")
        (ver-string (shell-command-to-string
                     ;; here, MS Windows (shell-command) needs a short name:
                     (concat (if (and ess-microsoft-p
                                      ;; silence byte compiler warns about w32-fns
                                      (fboundp 'w32-short-file-name))
                                 (w32-short-file-name rver)
                               rver)
                             " --version"))))
    (when (string-match
           "R \\(version \\)?[1-9][^\n]+ (\\(2[0-9-]+\\)\\( r[0-9]+\\)?"
           ver-string)
      (setq date (match-string 2 ver-string)))
    (cons date rver)))

(defun ess-current-R-version ()
  "Get the version of R currently running in the ESS buffer as a string."
  (ess-make-buffer-current)
  (car (ess-get-words-from-vector (format "base::as.character(%s)\n"
                                          (ess-r--format-call ".ess.Rversion")))))

(defun ess-current-R-at-least (version)
  "Is the version of R (in the ESS buffer) at least (\">=\") VERSION ?
Examples: (ess-current-R-at-least '2.7.0)
      or  (ess-current-R-at-least \"2.5.1\")"
  (ess-make-buffer-current)
  (string= "TRUE"
           (car (ess-get-words-from-vector
                 (format "base::as.character(%s >= \"%s\")\n"
                         (ess-r--format-call ".ess.Rversion")
                         version)))))
(defun ess-find-newest-date (rvers)
  "Find the newest version of R given in the a-list RVERS.
Each element of RVERS is a dotted pair (date . R-version), where
date is given as e.g.\"2007-11-30\" so that we can compare dates
as strings.  If a date is listed as \"-1\", that version of R
could not be found.

If the value returned is nil, no valid newest version of R could be found."
  (let (new-r this-r
              (new-time "0"))
    (while rvers
      (setq this-r (car rvers)
            rvers (cdr rvers))
      (when (string< new-time (car this-r))
        (setq new-time (car this-r)
              new-r    (cdr this-r))))
    new-r))

(defun ess-find-rterm (&optional ess-R-root-dir bin-Rterm-exe)
  "Find the full path of all occurrences of Rterm.exe under the ESS-R-ROOT-DIR.
If ESS-R-ROOT-DIR is nil, construct it by looking for an
occurrence of Rterm.exe in the `exec-path'. If there are no
occurrences of Rterm.exe in the `exec-path', then use
`ess-program-files' (which evaluates to something like
\"c:/progra~1/R/\" in English locales) which is the default
location for the R distribution. If BIN-RTERM-EXE is nil, then
use \"bin/Rterm.exe\"."
  (if (not ess-R-root-dir)
      (let ((Rpath (executable-find "Rterm")))
        (setq ess-R-root-dir
              (expand-file-name
               (if Rpath
                   (concat (file-name-directory Rpath) "../../")
                 (concat ess-program-files "/R/"))))
        (ess-write-to-dribble-buffer
         (format "(ess-find-rterm): ess-R-root-dir = '%s'\n" ess-R-root-dir))))

  (if (not bin-Rterm-exe) (setq bin-Rterm-exe "bin/Rterm.exe"))

  (when (file-directory-p ess-R-root-dir) ; otherwise file-name-all-.. errors
    (setq ess-R-root-dir
          (replace-regexp-in-string "[\\]" "/" ess-R-root-dir))
    (let ((R-ver
           (ess-drop-non-directories
            (ess-flatten-list
             (mapcar (lambda (r-prefix)
                       (file-name-all-completions r-prefix ess-R-root-dir))
                     (append '("rw") ess-r-runner-prefixes))))))
      (mapcar (lambda (dir)
                (let ((R-path
                       (concat ess-R-root-dir
                               (replace-regexp-in-string "[\\]" "/" dir)
                               bin-Rterm-exe)))
                  (if (file-exists-p R-path) R-path)))
              R-ver))))

;;;###autoload
(define-derived-mode ess-r-transcript-mode ess-transcript-mode "ESS R Transcript"
  "A Major mode for R transcript files."
  :syntax-table ess-r-mode-syntax-table
  :group 'ess
  (ess-setq-vars-local ess-r-customize-alist)
  (setq-local comint-prompt-regexp inferior-S-prompt)
  (setq-local ess-font-lock-keywords 'ess-R-font-lock-keywords)
  (setq-local paragraph-start (concat "\\s-*$\\|" page-delimiter))
  (setq-local paragraph-separate (concat "\\s-*$\\|" page-delimiter))
  (setq-local paragraph-ignore-fill-prefix t)
  (setq-local indent-line-function #'ess-r-indent-line)
  (setq-local add-log-current-defun-header-regexp "^\\(.+\\)\\s-+<-[ \t\n]*function")
  (setq-local font-lock-syntactic-face-function #'ess-r-font-lock-syntactic-face-function)
  (setq-local prettify-symbols-alist ess-r-prettify-symbols)
  (setq font-lock-defaults '(ess-build-font-lock-keywords
                             nil nil ((?\. . "w") (?\_ . "w") (?' . ".")))))

(defalias 'r-transcript-mode #'ess-r-transcript-mode)

;;;###autoload
(add-to-list 'auto-mode-alist '("\\.[Rr]out\\'" . ess-r-transcript-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist '("Rscript" . ess-r-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist '("r" . ess-r-mode))

(defun ess-r-fix-T-F (&optional from quietly)
  "Change T/F into TRUE and FALSE cautiously.
Do not change in comments and strings. Start at FROM, which
defaults to point, and change to end of buffer. When QUIETLY, do
not issue messages."
  (interactive "d\nP"); point and prefix (C-u)
  (save-excursion
    (goto-char from)
    (ess-rep-regexp "\\(\\([][=,()]\\|<-\\) *\\)T\\>" "\\1TRUE"
                    'fixcase nil (not quietly))
    (goto-char from)
    (ess-rep-regexp "\\(\\([][=,()]\\|<-\\) *\\)F\\>" "\\1FALSE"
                    'fixcase nil (not quietly))))
(define-obsolete-function-alias 'R-fix-T-F #'ess-r-fix-T-F
  "ESS 18.10")

(defvar ess--packages-cache nil
  "Cache var to store package names.
Used by `ess-r-install-library'.")

(defvar ess--CRAN-mirror nil
  "CRAN mirror name cache.")

(cl-defmethod ess-install-library--override (update package &context (ess-dialect "R"))
  "Prompt and install R PACKAGE.
With argument UPDATE, update cached packages list."
  (inferior-ess-r-force)
  (when (equal "@CRAN@" (car (ess-get-words-from-vector "getOption('repos')[['CRAN']]\n")))
    (ess-set-CRAN-mirror ess--CRAN-mirror)
    (ess-wait-for-process (get-process ess-current-process-name))
    (unless package (setq update t)))
  (when (or update
            (not ess--packages-cache))
    (message "Fetching R packages ... ")
    (setq ess--packages-cache
          (ess-get-words-from-vector--foreground "print(rownames(available.packages()), max=1e6)\n")))
  (let* ((ess-eval-visibly-p t)
         (package (or package
                      (ess-completing-read "Package to install" ess--packages-cache))))
    (process-send-string (get-process ess-current-process-name)
                         (format "install.packages('%s')\n" package))
    (display-buffer (buffer-name (ess-get-process-buffer)))))

(defun ess-setRepositories ()
  "Call setRepositories()."
  (interactive)
  (if (not (string-match "^R" ess-dialect))
      (message "Sorry, not available for %s" ess-dialect)
    (ess-eval-linewise "setRepositories(FALSE)\n")))

(defun ess-set-CRAN-mirror (&optional mirror)
  "Set cran MIRROR."
  (interactive)
  (let ((mirror-cmd "local({r <- getOption('repos'); r['CRAN'] <- '%s';options(repos=r)})\n"))
    (if mirror
        (ess-command (format mirror-cmd mirror))
      (when-let ((M1 (ess-get-words-from-vector "local({out <- getCRANmirrors(local.only=TRUE); print(paste(out$Name,'[',out$URL,']', sep=''))})\n"))
                 (mirror (ess-completing-read "Choose CRAN mirror" M1 nil t))
                 (url (car (cl-member mirror M1 :test #'string=))))
        (setq ess--CRAN-mirror (progn (string-match "\\(.*\\)\\[\\(.*\\)\\]$" url)
                                      (match-string 2 url)))
        (ess-command (format mirror-cmd ess--CRAN-mirror)))))
  (message "CRAN mirror: %s" (car (ess-get-words-from-vector "getOption('repos')[['CRAN']]\n"))))
(define-obsolete-function-alias 'ess-setCRANMiror #'ess-set-CRAN-mirror "ESS 18.10")

(defun ess-r-check-install-package (pkg)
  "Check if package PKG is installed and offer to install if not."
  (unless (ess-boolean-command (format "print(requireNamespace('%s', quietly = TRUE))\n" pkg))
    (if (y-or-n-p (format "Package '%s' is not installed. Install? " pkg))
        (ess-eval-linewise (format "install.packages('%s')\n" pkg))
      (signal 'quit nil))))

(define-obsolete-function-alias 'ess-r-sos #'ess-help-web-search "ESS 19.04")

(cl-defmethod ess--help-web-search-override (cmd &context (ess-dialect "R"))
  (ess-r-check-install-package "sos")
  (ess-eval-linewise (format "sos::findFn(\"%s\", maxPages=10)" cmd)))


(defun ess-R-scan-for-library-call (string)
  "Detect `library/require' call in STRING and update tracking vars.
Placed into `ess-presend-filter-functions' for R dialects."
  (when (string-match-p "\\blibrary(\\|\\brequire(" string)
    (ess--mark-search-list-as-changed))
  string)

(cl-defmethod ess-installed-packages (&context (ess-dialect "R"))
  ;;; FIXME? .packages() does not cache; installed.packages() does but is slower first time
  (ess-get-words-from-vector--foreground "print(.packages(TRUE), max=1e6)\n"))

(cl-defmethod ess-load-library--override (pack &context (ess-dialect "R"))
  "Load an R package."
  (ess-eval-linewise (format "library('%s')\n" pack)))

(define-obsolete-function-alias 'ess-library #'ess-load-library "ESS[12.09-1]")

;;; smart-comma was a bad idea
(eval-after-load "eldoc"
  '(eldoc-add-command "ess-smart-comma"))


;;*;; Interaction with R

;;;*;;; Evaluation

(defun ess-r-arg (param value &optional wrap)
  (let ((value (if wrap
                   (concat "'" value "'")
                 value)))
    (concat ", " param " = " value)))

(defun ess-r-build-args (visibly output namespace)
  (let ((visibly (ess-r-arg "visibly" (if visibly "TRUE" "FALSE")))
        (output (ess-r-arg "output" (if output "TRUE" "FALSE")))
        (pkg (when namespace (ess-r-arg "package" namespace t)))
        (verbose (when (and namespace
                            ess-r-namespaced-load-verbose)
                   (ess-r-arg "verbose" "TRUE"))))
    (concat visibly output pkg verbose)))

(defun ess-r--format-call (cmd &rest objects)
  "Prefix an ESSR command with a namespace qualifier.
CMD is formatted with OBJECTS using `format'."
  (concat "base::as.environment('ESSR')$"
          (apply #'format cmd objects)))

(cl-defmethod ess-build-eval-command--override (string &context (ess-dialect "R")
                                                       &optional visibly output file &rest args)
  "R method to build eval command."
  (let* ((namespace (caar args))
         (namespace (unless ess-debug-minor-mode
                      (or namespace (ess-r-get-evaluation-env))))
         (cmd (ess-r--format-call (if namespace ".ess.ns_eval" ".ess.eval")))
         (file (when file (ess-r-arg "file" file t)))
         (rargs (ess-r-build-args visibly output namespace)))
    (concat cmd "(\"" string "\"" rargs file ")\n")))

(cl-defmethod ess-build-load-command (string &context (ess-dialect "R")
                                             &optional visibly output file &rest _args)
  (let* ((namespace (or file (ess-r-get-evaluation-env)))
         (cmd (ess-r--format-call (if namespace ".ess.ns_source" ".ess.source")))
         (rargs (ess-r-build-args visibly output namespace)))
    (concat cmd "('" string "'" rargs ")\n")))

(defun ess-r-build-eval-message (message)
  (let ((env (cond (ess-debug-minor-mode
                    (substring-no-properties ess-debug-indicator 1))
                   ((ess-r-get-evaluation-env)))))
    (if env
        (format "[%s] %s" env message)
      message)))

(defvar-local ess-r-evaluation-env nil
  "Environment into which code should be evaluated.
When this variable is nil, code is evaluated in the current
environment. Currently only packages can be set as evaluation
environments. Use `ess-r-set-evaluation-env' to set this
variable.")

(defun ess-r-get-evaluation-env ()
  "Get current evaluation env."
  ess-r-evaluation-env)

(defun ess-r-set-evaluation-env (&optional arg)
  "Select a package namespace for evaluation of R code.

Call interactively with a prefix argument to disable evaluation
in a namespace.  When calling from a function, ARG can be a
string giving the package to select, any other non-nil value to
disable, or nil to prompt for a package.

If `ess-r-prompt-for-attached-pkgs-only' is non-nil, prompt only for
attached packages."
  (interactive "P")
  (let ((env (cond ((stringp arg) arg)
                   ((null arg) (ess-r--select-package-name))
                   (t "*none*"))))
    (if (equal env "*none*")
        (let ((cur-env (ess-r-get-evaluation-env)))
          (setq ess-r-evaluation-env nil)
          (delq 'ess-r--evaluation-env-mode-line ess--local-mode-line-process-indicator)
          (message (format "Evaluation in %s disabled" (propertize cur-env 'face font-lock-function-name-face))))
      (setq ess-r-evaluation-env env)
      (add-to-list 'ess--local-mode-line-process-indicator 'ess-r--evaluation-env-mode-line t)
      (message (format "Evaluating in %s" (propertize env 'face font-lock-function-name-face))))
    (force-mode-line-update)))

(defvar-local ess-r--evaluation-env-mode-line
  '(:eval (let ((env (ess-r-get-evaluation-env)))
            (if env
                (format " %s"
                        (propertize  (if (equal env (ess-r-package-name))
                                         "pkg"
                                       env)
                                     'face 'mode-line-emphasis))
              ""))))
(put 'ess-r--evaluation-env-mode-line 'risky-local-variable t)

(defvar ess-r-namespaced-load-only-existing t
  "Whether to load only objects already existing in a namespace.")

(cl-defmethod ess-load-file--override (file &context (ess-dialect "R"))
  (cond
   ;; Namespaced evaluation
   ((ess-r-get-evaluation-env)
    (ess-r-load-file-namespaced file))
   ;; Evaluation into current env via .ess.source()
   (t
    (let ((command (ess-build-load-command file nil t)))
      (ess-send-string (ess-get-process) command)))))

(defun ess-r-load-file-namespaced (&optional file)
  "Load FILE into a package namespace.

This prompts for a package when no package is currently
selected (see `ess-r-set-evaluation-env')."
  (ess-force-buffer-current "R process to use: ")
  (let* ((pkg-name (ess-r-get-evaluation-env))
         (command (ess-build-load-command file nil t pkg-name)))
    (ess-send-string (ess-get-process) command)))

(cl-defmethod ess-send-region--override (process start end visibly message type
                                                 &context (ess-dialect "R"))
  (cond
   ;; Namespaced evaluation
   ((ess-r-get-evaluation-env)
    (ess-r-send-region-namespaced process start end visibly message))
   ;; Evaluation into current env
   (t
    (ess-send-string process (buffer-substring start end) visibly message type))))

(defun ess-r-send-region-namespaced (proc start end &optional visibly message)
  "Ask for for the package and devSource region into it."
  (or (ess-r-get-evaluation-env)
      (ess-r-set-evaluation-env))
  (message (ess-r-build-eval-message (or message "Eval region")))
  (ess-send-string proc (buffer-substring start end) visibly message))


;;;*;;; Help

(cl-defmethod ess-build-help-command (object &context (ess-dialect "R"))
  (let ((info (ess-r--split-namespace object)))
    (if info
        (ess-r-help--build-help-command--qualified (car info) (cdr info))
      (ess-r-help--build-help-command--unqualified object))))

(defun ess-r--split-namespace (sym)
  (when (string-match "^[[:alnum:].]+::" sym)
      (let ((pkg (substring-no-properties sym (match-beginning 0) (- (match-end 0) 2)))
            (obj (substring-no-properties sym (match-end 0))))
        (cons pkg obj))))

(defvar-local ess-r-help--local-object nil)
(defvar-local ess-r-help--local-package nil)
(put 'ess-r-help--local-object 'permanent-local t)
(put 'ess-r-help--local-package 'permanent-local t)

(defun ess-r-help--build-help-command--qualified (pkg obj)
  (setq ess-r-help--local-package pkg)
  (setq ess-r-help--local-object obj)
  (let ((obj-arg (concat "'" obj "'"))
        (pkg-arg (ess-r-arg "package" pkg t)))
    (ess-r--format-call ".ess.help(%s%s)\n" obj-arg pkg-arg)))

(defun ess-r-help--build-help-command--unqualified (obj)
  (if (eq ess-help-type 'index)
      ;; We are in index page, qualify with namespace
      (ess-r-help--build-help-command--qualified ess-help-object obj)
    (let ((pkg (ess-r-help--find-package obj)))
      (unless pkg
        (error "Can't find documentation for `%s'" obj))
      (ess-r-help--build-help-command--qualified pkg obj))))

(defun ess-r-help--find-package (object)
  "Find package where to find OBJECT.
If there are multiple packages attached to the search path, the
user is prompted for a package location. If OBJECT is not
documented, returns nil."
  (let* ((paths (ess-get-words-from-vector
                 (format "as.character(utils::help('%s'))\n" object)))
         (paths (if (> (length paths) 1)
                    (cl-delete-if
                     (lambda (x) (string-match-p "reexports$" x))
                     paths)
                  paths)))
    (cond ((not paths)
           nil)
          ((and (> (length paths) 1)
                (not noninteractive))
           (let ((path (ess-completing-read "Choose location" paths nil t)))
             (ess-r-help--get-pkg-from-help-path path)))
          (t
           (ess-r-help--get-pkg-from-help-path (car paths))))))

(defun ess-r-help--get-pkg-from-help-path (path)
  (file-name-nondirectory
   (directory-file-name
    (file-name-directory
     (directory-file-name
      (file-name-directory
       path))))))

(defconst inferior-ess-r--input-help (format "^ *help *(%s)" ess-help-arg-regexp))
(defconst inferior-ess-r--input-?-help-regexp "^ *\\(?:\\(?1:[a-zA-Z ]*?\\?\\{1,2\\}\\) *\\(?2:.+\\)\\)")
(defconst inferior-ess-r--page-regexp (format "^ *page *(%s)" ess-help-arg-regexp))

(defun ess-help-r--process-help-input (proc string)
  (let ((help-match (and (string-match inferior-ess-r--input-help string)
                         (match-string 2 string)))
        (help-?-match (and (string-match inferior-ess-r--input-?-help-regexp string)
                           string))
        (page-match   (and (string-match inferior-ess-r--page-regexp string)
                           (match-string 2 string))))
    (when (or help-match help-?-match page-match)
      (cond (help-match
             (ess-display-help-on-object help-match)
             (process-send-string proc "\n"))
            (help-?-match
             (ess-help-r--display-help-? string help-?-match)
             (process-send-string proc "\n"))
            (page-match
             (switch-to-buffer-other-window
              (ess-command (concat page-match "\n")
                           (get-buffer-create (concat page-match ".rt"))))
             (ess-r-transcript-mode)
             (process-send-string proc "\n")))
      t)))

(defun ess-help-r--display-help-? (string help-?-match)
  (cond ((string-match "\\?\\?\\(.+\\)" help-?-match)
         (ess--display-indexed-help-page (concat help-?-match "\n")
                                         "^\\([^ \t\n]+::[^ \t\n]+\\)[ \t\n]+"
                                         (format "*ess-apropos[%s](%s)*"
                                                 ess-current-process-name (match-string 1 help-?-match))
                                         'apropos))
        ((string-match "^ *\\? *\\([^ \t]+\\)$" help-?-match)
         (ess-display-help-on-object (match-string 1 help-?-match)))
        ;; Anything else we send to process almost unchanged
        (t
         (let ((help-?-match (and (string-match inferior-ess-r--input-?-help-regexp string)
                                  (format "%s%s" (match-string 1 string)
                                          (ess-help-r--sanitize-topic (match-string 2 string))))))
           (ess-display-help-on-object help-?-match "%s\n")))))

(defun ess-help-r--sanitize-topic (string)
  "Enclose help topic STRING into `` to avoid ?while ?if etc hangs."
  (if (string-match "\\([^:]*:+\\)\\(.*\\)$" string) ; treat foo::bar correctly
      (format "%s`%s`" (match-string 1 string) (match-string 2 string))
    (format "`%s`" string)))


;;;*;;; Utils for inferior R process

(defun inferior-ess-r-input-sender (proc string)
  (save-current-buffer
    (or (ess-help-r--process-help-input proc string)
        (inferior-ess-input-sender proc string))))

(defun ess-r-load-ESSR ()
  "Load ESSR functionality into ESSR environment.
On remotes, when `ess-r-fetch-ESSR-on-remotes' is non-nil we
fetch ESSR environment from github to the remote machine.
Otherwise (the default) we source ESSR files into the remote
process."
  (interactive)
  ;; `.ess.command()` is not defined until ESSR is loaded so disable
  ;; it temporarily. Would be helpful to implement an `inferior-ess-let'
  ;; macro .
  (cond
   ((file-remote-p (ess-get-process-variable 'default-directory))
    (if (eq ess-r-fetch-ESSR-on-remotes t)
        (or (ess-r--fetch-ESSR-remote)
            (ess-r--load-ESSR-remote))
      (ess-r--load-ESSR-remote)))
   ((and (bound-and-true-p ess-remote))
    ;; NB: With ess-remote we send by chunks because sending large sources is
    ;; fragile
    (if ess-r-fetch-ESSR-on-remotes
        (or (ess-r--fetch-ESSR-remote)
            (ess-r--load-ESSR-remote t))
      (ess-r--load-ESSR-remote t)))
   (t (ess-r--load-ESSR-local))))

(defun ess-r--load-ESSR-local ()
  "Load ESSR into a local process.
Source the etc/ESSR/.load.R file into the R process. The
.ess.ESSR.load function sources all of the contents of the
etc/ESSR/R directory into the ESSR environment and attaches the
environment to the search path."
  (let* ((src-dir (expand-file-name "ESSR/R" ess-etc-directory))
         (buf (ess-command (ess-r--load-ESSR-command src-dir))))
    (with-current-buffer buf
      (let ((msg (buffer-string)))
        (when (> (length msg) 1)
          (message (format "Messages while loading ESSR: %s" msg)))))))

(defun ess-r--load-ESSR-command (src-dir)
  (format "base::tryCatch(
             base::local({
               base::source('%s/.load.R', local=TRUE) #define load.ESSR
               .ess.ESSR.load('%s')
             }),
             error = function(cnd) {
               msg <- paste0('ESSR::ERROR \"', conditionMessage(cnd), '\"')
               writeLines(msg)
             }
           )\n"
          src-dir
          src-dir))

(defun ess-r--load-ESSR-remote (&optional chunked)
  "Load ESSR into a remote process through the process connection.
Send the contents of the etc/ESSR/R directory to the remote
process through the process connection file by file. Then,
collect all the objects into an ESSR environment and attach to
the search path. If CHUNKED is non-nil, split each file by 
separators and send chunk by chunk."
  (ess-command (format ".ess.ESSRversion <<- '%s'\n" essr-version))
  (with-temp-message "Loading ESSR into remote ..."
    (let ((src-dir (expand-file-name "ESSR/R" ess-etc-directory)))
      (dolist (file (directory-files src-dir t "\\.R\\'"))
        (ess--inject-code-from-file file chunked))
      (ess-command ".ess.collect.ESSR.objects()\n"))))

(defun ess-r--fetch-ESSR-remote ()
  "Load ESSR into a remote process through a GitHub download.
Downloads a file with a serialized version of the R ESSR
environment from GitHub and attaches it to the search path. If
the file already exists on disk from a previous download then the
download step is omitted. This function returns t if the ESSR
load is successful, and nil otherwise."
  (let ((loader (ess-file-content (expand-file-name "ESSR/LOADREMOTE" ess-etc-directory)))
        (essr (or essr-version
                  ;; FIXME: Hack: on MELPA essr-version is not set
                  (lm-with-file (expand-file-name "ess.el" ess-lisp-directory)
                    (lm-header "ESSR-Version"))
                  (error "`essr-version' could not be automatically inferred from ess.el file"))))
    (or (with-temp-message "Fetching and loading ESSR into the remote ..."
          (ess-boolean-command (format loader essr)))
        (let ((errmsg (with-current-buffer " *ess-command-output*" (buffer-string))))
          (message (format "Couldn't load or download ESSR.rds on the remote.\n Error: %s\n Injecting local copy of ESSR." errmsg))
          nil))))

(cl-defmethod ess-quit--override (arg &context (ess-dialect "R"))
  "With ARG, do not offer to save the workspace."
  (let ((cmd (format "base::q('%s')\n" (if arg "no" "default")))
        (sprocess (ess-get-process ess-current-process-name)))
    (when (not sprocess) (error "No ESS process running"))
    (ess-cleanup)
    (ess-send-string sprocess cmd)))

(defcustom inferior-ess-r-reload-hook nil
  "Hook run when reloading the R inferior buffer."
  :type 'hook
  :group 'ess-R)

(cl-defmethod inferior-ess-reload--override (start-name start-args &context (ess-dialect "R"))
  "Call `run-ess-r' with START-ARGS.
Then run `inferior-ess-r-reload-hook'."
  (let ((inferior-ess-r-program start-name))
    (run-ess-r start-args))
  (run-hooks 'inferior-ess-r-reload-hook))

(defun inferior-ess-r-force (&optional prompt force no-autostart ask-if-1)
  (setq-local ess-dialect "R")
  (ess-force-buffer-current prompt force no-autostart ask-if-1))


;;*;; Editing Tools

;;;*;;; Indentation Engine

;; Written by Lionel Henry in mid 2015

(defun ess-r-indent-line ()
  "Indent current line as ESS R code.
Return the amount the indentation changed by."
  (when-let ((indent (ess-calculate-indent)))
    (let ((case-fold-search nil)
          (pos (- (point-max) (point)))
          beg shift-amt)
      (beginning-of-line)
      (setq beg (point))
      (skip-chars-forward " \t")
      (setq shift-amt (- indent (current-column)))
      (if (zerop shift-amt)
          (if (> (- (point-max) pos) (point))
              (goto-char (- (point-max) pos)))
        (delete-region beg (point))
        (indent-to indent)
        ;; If initial point was within line's indentation,
        ;; position after the indentation.
        ;; Else stay at same point in text.
        (when (> (- (point-max) pos) (point))
          (goto-char (- (point-max) pos))))
      shift-amt)))

(defun ess-r-indent-exp ()
  (save-excursion
    (when current-prefix-arg
      (ess-climb-to-top-level))
    (let* ((bounds (ess-continuations-bounds))
           (end (cadr bounds))
           (beg (if current-prefix-arg
                    (car bounds)
                  (forward-line)
                  (point))))
      (indent-region beg end))))

(defun ess-indent-call (&optional start)
  (save-excursion
    (when (ess-escape-calls)
      (setq start (or start (point)))
      (skip-chars-forward "^[(")
      (forward-char)
      (ess-up-list)
      (indent-region start (point)))))

(defun ess-offset (offset)
  (setq offset
        (symbol-value (intern (concat "ess-offset-" (symbol-name offset)))))
  (when (and (not (eq offset nil))
             (listp offset)
             (or (numberp (cadr offset))
                 (eq (cadr offset) t)
                 (error "Malformed offset")))
    (setq offset (cadr offset)))
  (cond ((numberp offset)
         offset)
        ((null offset)
         0)
        (t
         ess-indent-offset)))

(defun ess-offset-type (offset)
  (setq offset
        (symbol-value (intern (concat "ess-offset-" (symbol-name offset)))))
  (if (listp offset)
      (car offset)
    offset))

(defun ess-overridden-blocks ()
  (append (when (memq 'fun-decl ess-align-blocks)
            (list (car ess-prefixed-block-patterns)))
          (when (memq 'control-flow ess-align-blocks)
            (append (cdr ess-prefixed-block-patterns)
                    '("}?[ \t]*else")))))

(defun ess-calculate-indent ()
  "Return appropriate indentation for current line as ESS code.
In usual case returns an integer: the column to indent to.
Returns nil if line starts inside a string, t if in a comment."
  (save-excursion
    (beginning-of-line)
    (let* ((indent-point (point))
           (state (syntax-ppss))
           (containing-sexp (cadr state))
           (prev-containing-sexp (car (last (butlast (nth 9 state))))))
      (back-to-indentation)
      (cond
       ;; Strings
       ((ess-inside-string-p)
        (current-indentation))
       ;; Comments
       ((ess-calculate-indent--comments))
       ;; Indentation of commas
       ((looking-at ",")
        (ess-calculate-indent--comma))
       ;; Arguments: Closing
       ((ess-call-closing-p)
        (ess-calculate-indent--call-closing-delim))
       ;; Block: Contents (easy cases)
       ((ess-calculate-indent--block-relatively))
       ;; Block: Prefixed block
       ((ess-calculate-indent--prefixed-block-curly))
       ;; Continuations
       ((ess-calculate-indent--continued))
       ;; Block: Overridden contents
       ((ess-calculate-indent--aligned-block))
       ;; Block: Opening
       ((ess-block-opening-p)
        (ess-calculate-indent--block-opening))
       ;; Bare line
       ((and (null containing-sexp)
             (not (ess-unbraced-block-p)))
        0)
       ;; Block: Closing
       ((ess-block-closing-p)
        (ess-calculate-indent--block 0))
       ;; Block: Contents
       ((ess-block-p)
        (ess-calculate-indent--block))
       ;; Arguments: Nested calls override
       ((ess-calculate-indent--nested-calls))
       ;; Arguments: Contents
       (t
        (ess-calculate-indent--args))))))

(defun ess-calculate-indent--comments ()
  (when ess-indent-with-fancy-comments
    (cond
     ;; ### or #!
     ((or (looking-at "###")
          (and (looking-at "#!")
               (= 1 (line-number-at-pos))))
      0)
     ;; Single # comment
     ((looking-at "#[^#']")
      comment-column))))

(defun ess-calculate-indent--comma ()
  (when (ess-inside-call-p)
    (let ((indent (save-excursion
                    (ess-calculate-indent--args)))
          (unindent (progn (skip-chars-forward " \t")
                           ;; return number of skipped chars
                           (skip-chars-forward ", \t"))))
      (- indent unindent))))

(defun ess-calculate-indent--call-closing-delim ()
  (cond ((save-excursion
           (ess-skip-blanks-backward t)
           (eq (char-before) ?,))
         (ess-calculate-indent--args nil))
        ((save-excursion
           (and (ess-ahead-operator-p)
                (or (ess-ahead-definition-op-p)
                    (not ess-align-continuations-in-calls))))
         (ess-calculate-indent--continued))
        (t
         (ess-calculate-indent--args 0))))

(defun ess-calculate-indent--block-opening ()
  (cond
   ;; Block is an argument in a function call
   ((when containing-sexp
      (ess-at-containing-sexp
        (ess-behind-call-opening-p "[[(]")))
    (ess-calculate-indent--block 0))
   ;; Top-level block
   ((null containing-sexp) 0)
   ;; Block is embedded in another block
   ((ess-at-containing-sexp
      (+ (current-indentation)
         (ess-offset 'block))))))

(defun ess-calculate-indent--aligned-block ()
  ;; Check for `else' opening
  (if (and (memq 'control-flow ess-align-blocks)
           (looking-at "else\\b")
           (ess-climb-if-else))
      (progn
        (when (looking-at "else\\b")
          (ess-skip-curly-backward))
        (current-column))
    ;; Check for braced and unbraced blocks
    (ess-save-excursion-when-nil
      (let ((offset (if (looking-at "[{})]")
                        0 (ess-offset 'block))))
        (when (and (cond
                    ;; Unbraced blocks
                    ((ess-climb-block-prefix))
                    ;; Braced blocks
                    (containing-sexp
                     (when (ess-at-containing-sexp
                             (looking-at "{"))
                       (ess-escape-prefixed-block))))
                   (cl-some #'looking-at
                            (ess-overridden-blocks)))
          (+ (current-column) offset))))))

(defun ess-calculate-indent--block-relatively ()
  (ess-save-excursion-when-nil
    (let ((offset (if (looking-at "[})]") 0 (ess-offset 'block)))
          (start-line (line-number-at-pos)))
      (cond
       ;; Braceless block continuations: only when not in a call
       ((ess-save-excursion-when-nil
          (and (not (looking-at "{"))
               (ess-goto-char (ess-unbraced-block-p))
               (not (looking-at "function\\b"))
               (or (null containing-sexp)
                   (ess-at-containing-sexp
                     (not (looking-at "("))))))
        (ess-maybe-climb-broken-else 'same-line)
        (ess-skip-curly-backward)
        (+ (current-column)
           (ess-offset 'block)))
       ;; Don't indent relatively other continuations
       ((ess-ahead-continuation-p)
        nil)
       ;; If a block already contains an indented line, we can indent
       ;; relatively from that first line
       ((ess-save-excursion-when-nil
          (and (not (looking-at "}"))
               containing-sexp
               (goto-char containing-sexp)
               (looking-at "{")
               (progn
                 (forward-line)
                 (back-to-indentation)
                 (/= (line-number-at-pos) start-line))
               (not (looking-at "[ \t]*\\(#\\|$\\)"))
               (save-excursion
                 (or (ess-jump-expression)
                     (ess-jump-continuations))
                 (< (line-number-at-pos) start-line))))
        (current-column))
       ;; If a block is not part of a call, we can indent relatively
       ;; from the opening {. First check that enclosing { is first
       ;; thing on line
       ((and containing-sexp
             (not (ess-unbraced-block-p))
             (goto-char containing-sexp)
             (ess-block-opening-p)
             (equal (point) (save-excursion
                              (back-to-indentation)
                              (point))))
        (+ (current-column) offset))))))

(defun ess-arg-block-p ()
  (unless (or (null containing-sexp)
              ;; Unbraced blocks in a { block are not arg blocks
              (and (ess-unbraced-block-p)
                   (ess-at-containing-sexp
                     (looking-at "{"))))
    (cond
     ;; Unbraced body
     ((ess-at-indent-point
        (and (ess-unbraced-block-p)
             (goto-char containing-sexp)
             (ess-behind-call-opening-p "[[(]")))
      'body)
     ;; Indentation of opening brace as argument
     ((ess-at-containing-sexp
        (ess-behind-call-opening-p "[[(]"))
      'opening)
     ;; Indentation of body or closing brace as argument
     ((ess-at-containing-sexp
        (and (or (looking-at "{")
                 (ess-behind-block-paren-p))
             prev-containing-sexp
             (goto-char prev-containing-sexp)
             (ess-behind-call-opening-p "[[(]")))
      'body))))

(defun ess-calculate-indent--block (&optional offset)
  (let ((arg-block (ess-arg-block-p)))
    (cond (arg-block
           (ess-calculate-indent--arg-block offset arg-block))
          (t
           ;; Block is not part of an arguments list. Climb over any
           ;; block opening (function declaration, etc) to indent from
           ;; starting indentation.
           (or (ess-climb-block-prefix)
               (and (goto-char containing-sexp)
                    (ess-climb-block-prefix)))
           (+ (current-indentation) (or offset (ess-offset 'block)))))))

(defun ess-calculate-indent--arg-block (offset arg-block)
  (let* ((block-type (cond ((or (ess-at-containing-sexp
                                  (and (eq arg-block 'body)
                                       (ess-climb-block-prefix "function")))
                                (ess-at-indent-point
                                  (and (eq arg-block 'opening)
                                       (ess-backward-sexp 2)
                                       (looking-at "function\\b"))))
                            'fun-decl)
                           ((ess-at-indent-point
                              (ess-unbraced-block-p))
                            'unbraced)
                           ((ess-at-containing-sexp
                              (not (ess-ahead-attached-name-p)))
                            'bare-block)
                           (t)))
         (call-pos (if (and (not (eq block-type 'unbraced))
                            (not (eq arg-block 'opening)))
                       (goto-char prev-containing-sexp)
                     (prog1 containing-sexp
                       (goto-char indent-point)))))
    (ess-calculate-indent--args offset (ess-offset-type 'block)
                                call-pos indent-point block-type)))

;; This function is currently the speed bottleneck of the indentation
;; engine. This is due to the need to call (ess-maximum-args-indent)
;; to check if some previous arguments have been pushed off from their
;; natural indentation: we need to check the whole call. This is very
;; inefficient especially when indenting a region containing a large
;; function call (e.g. some dplyr's data cleaning code). Should be
;; solved by implementing a cache as in (syntax-ppss), though it's
;; probably not worth the work.
(defun ess-calculate-indent--args (&optional offset type call-pos to block)
  (let* ((call-pos (or call-pos containing-sexp))
         (max-col (prog1 (unless (eq type 'prev-line)
                           (ess-maximum-args-indent call-pos to))
                    (goto-char call-pos)))
         (override (and ess-align-arguments-in-calls
                        (save-excursion
                          (ess-climb-object)
                          (cl-some #'looking-at
                                   ess-align-arguments-in-calls))))
         (type-sym (cond (block 'block)
                         ((looking-at "[[:blank:]]*[([][[:blank:]]*\\($\\|#\\)")
                          'arguments-newline)
                         (t 'arguments)))
         (type (or type
                   (and override 'open-delim)
                   (ess-offset-type type-sym)))
         (offset (or offset
                     (and (not block) (eq type 'open-delim) 0)
                     (ess-offset type-sym)))
         (indent
          (cond
           ;; Indent from opening delimiter
           ((eq type 'open-delim)
            (ess-calculate-indent--args-open-delim))
           ;; Indent from attached name
           ((eq type 'prev-call)
            (ess-calculate-indent--args-prev-call block))
           ;; Indent from previous line indentation
           ((eq type 'prev-line)
            (let ((out (ess-calculate-indent--args-prev-line type block offset)))
              (setq offset (pop out))
              (pop out)))
           (t
            (error "Malformed offset")))))
    (if max-col
        (ess-adjust-argument-indent indent offset max-col block)
      (+ indent offset))))

(defun ess-calculate-indent--args-open-delim ()
  (forward-char)
  (current-column))

(defun ess-calculate-indent--args-prev-call (block)
  ;; Handle brackets chains such as ][ (cf data.table)
  (ess-climb-chained-delims)
  ;; Handle call chains
  (if ess-indent-from-chain-start
      (while (and (ess-backward-sexp)
                  (when (looking-back "[[(][ \t,]*" (line-beginning-position))
                    (goto-char (match-beginning 0)))))
    (ess-backward-sexp))
  (when ess-indent-from-lhs
    (ess-climb-lhs))
  (if (and nil
           (eq block 'fun-decl)
           (not (eq arg-block 'opening))
           (not (eq (ess-offset-type type-sym) 'open-delim)))
      (+ (ess-offset 'block) (current-column))
    (current-column)))

(defun ess-calculate-indent--args-prev-line (type block offset)
  (ess-at-indent-point
    (cond
     ;; Closing delimiters are actually not indented at
     ;; prev-line, but at opening-line
     ((looking-at "[]})]")
      (ess-up-list -1)
      (when (looking-at "{")
        (ess-climb-block-prefix))
      (list offset (current-indentation)))
     ;; Function blocks need special treatment
     ((and (eq type 'prev-line)
           (eq block 'fun-decl))
      (goto-char containing-sexp)
      (ess-climb-block-prefix)
      (list offset (current-indentation)))
     ;; Regular case
     (t
      ;; Find next non-empty line to indent from
      (while (and (= (forward-line -1) 0)
                  (looking-at "[ \t]*\\($\\|#\\)")))
      (goto-char (ess-code-end-position))
      ;; Climb relevant structures
      (unless (ess-climb-block-prefix)
        (when (eq (char-before) ?,)
          (forward-char -1))
        (ess-climb-expression)
        (ess-climb-continuations))
      ;; The following ensures that only the first line
      ;; counts. Otherwise consecutive statements would get
      ;; increasingly more indented.
      (let ((offset (if (and block
                             containing-sexp
                             (not (eq block 'unbraced))
                             (save-excursion
                               (/= (line-number-at-pos)
                                   (progn (goto-char containing-sexp)
                                          (line-number-at-pos)))))
                        0
                      offset)))
        (list offset (current-indentation)))))))

;; Indentation of arguments needs to keep track of how previous
;; arguments are indented. If one of those has a smaller indentation,
;; we push off the current line from its natural indentation. For
;; block arguments, we still need to push off this column so we ignore
;; it.
(defun ess-adjust-argument-indent (base offset max-col push)
  (if push
      (+ (min base max-col) offset)
    (min (+ base offset) max-col)))

;; When previous arguments are shifted to the left (can happen in
;; several situations) compared to their natural indentation, the
;; following lines should not get indented past them. The following
;; function checks the minimum indentation for all arguments of the
;; current function call or bracket indexing.
(defun ess-maximum-args-indent (&optional from to)
  (let* ((to (or to (point)))
         (to-line (line-number-at-pos to))
         (from-line (progn
                      (goto-char (1+ (or from containing-sexp)))
                      (line-number-at-pos)))
         max-col)
    (while (< (line-number-at-pos) to-line)
      (forward-line)
      (back-to-indentation)
      ;; Ignore the line with the function call, the line to be
      ;; indented, and empty lines.
      (unless (or (>= (line-number-at-pos) to-line)
                  (looking-at "[ \t]*\\($\\|#\\)"))
        (let ((indent (cond
                       ;; First line: minimum indent is right after (
                       ((= (line-number-at-pos) from-line)
                        (save-excursion
                          (goto-char (1+ containing-sexp))
                          (current-column)))
                       ;; Handle lines starting with a comma
                       ((save-excursion
                          (looking-at ","))
                        (+ (current-indentation) 2))
                       (t
                        (current-indentation)))))
          (setq max-col (min indent (or max-col indent))))))
    max-col))

;; Move to leftmost side of a call (either the first letter of its
;; name or its closing delim)
(defun ess-move-to-leftmost-side ()
  (when (or (looking-at "[({]")
            (ess-behind-call-p))
    (ess-save-excursion-when-nil
      (let ((start-col (current-column)))
        (skip-chars-forward "^{[(")
        (forward-char)
        (ess-up-list)
        (forward-char -1)
        (< (current-column) start-col)))))

(defun ess-max-col ()
  (let ((max-col (point)))
    (save-excursion
      (while (< (point) indent-point)
        (unless (and ess-indent-with-fancy-comments
                     (looking-at "### "))
          (setq max-col (min max-col (current-column))))
        (forward-line)
        (back-to-indentation)))
    max-col))

(defun ess-calculate-indent--prefixed-block-curly ()
  (when (looking-at "{")
    (ess-save-excursion-when-nil
      (let ((block-type (ess-climb-block-prefix)))
        (cond ((ess-save-excursion-when-nil
                 (and (memq 'fun-decl-opening ess-indent-from-lhs)
                      (string= block-type "function")
                      (ess-climb-operator)
                      (ess-behind-assignment-op-p)
                      (ess-climb-expression)))
               (current-column))
              ((= (save-excursion
                    (back-to-indentation)
                    (point))
                  (point))
               (ess-calculate-indent--continued)))))))

(defun ess-calculate-indent--continued ()
  "If a continuation line, return an indent of this line, otherwise nil."
  (save-excursion
    (let* ((cascade (eq (ess-offset-type 'continued) 'cascade))
           (climbed (ess-climb-continuations cascade))
           max-col)
      (when climbed
        (cond
         ;; Overridden calls
         ((and ess-align-continuations-in-calls
               (not (eq climbed 'def-op))
               containing-sexp
               (save-excursion
                 (goto-char containing-sexp)
                 (looking-at "[[(]")))
          (setq max-col (ess-max-col))
          (ess-move-to-leftmost-side)
          (+ (min (current-column) max-col)
             (if (eq climbed 'def-op)
                 (ess-offset 'continued)
               0)))
         ;; Regular case
         (t
          (let ((first-indent (or (eq climbed 'def-op)
                                  (save-excursion
                                    (when (ess-ahead-closing-p)
                                      (ess-climb-expression))
                                    (not (ess-climb-continuations cascade))))))
            ;; Record all indentation levels between indent-point and
            ;; the line we climbed. Some lines may have been pushed off
            ;; their natural indentation. These become the new
            ;; reference.
            (setq max-col (ess-max-col))
            ;; Indenting continuations from the front of closing
            ;; delimiters looks better
            (when
                (ess-ahead-closing-p)
              (backward-char))
            (+ (min (current-column) max-col)
               (cond
                ((eq (ess-offset-type 'continued) 'cascade)
                 (ess-offset 'continued))
                (first-indent
                 (ess-offset 'continued))
                (t
                 0))))))))))

(defun ess-calculate-indent--nested-calls ()
  (when ess-align-nested-calls
    (let ((calls (mapconcat #'identity ess-align-nested-calls "\\|"))
          match)
      (save-excursion
        (and containing-sexp
             (looking-at (concat "\\(" calls "\\)("))
             (setq match (match-string 1))
             (goto-char containing-sexp)
             (looking-at "(")
             (ess-backward-sexp)
             (looking-at (concat match "("))
             (current-column))))))


;;;*;;; Call filling engine

;; Unroll arguments to a single line until closing marker is found.
(defun ess-fill--unroll-lines (bounds &optional jump-cont)
  (let* ((last-pos (point-min))
         (containing-sexp (ess-containing-sexp-position)))
    (goto-char (car bounds))
    (goto-char (ess-code-end-position))
    (while (and (/= (point) last-pos)
                (< (line-end-position)
                   (cadr bounds)))
      (setq last-pos (point))
      ;; Check whether we ended up in a sub call. In this case, jump
      ;; over it, otherwise, join lines.
      (let ((contained-sexp (ess-containing-sexp-position)))
        (cond ((and contained-sexp
                    containing-sexp
                    (not (= containing-sexp contained-sexp)))
               (goto-char (1+ contained-sexp))
               (ess-up-list))
              ;; Jump over continued statements
              ((and jump-cont (ess-ahead-operator-p 'strict))
               (ess-climb-token)
               (ess-jump-continuations))
              ;; Jump over comments
              ((looking-at "#")
               (forward-line)
               (funcall indent-line-function))
              (t
               (join-line 1))))
      (goto-char (ess-code-end-position)))
    (goto-char (car bounds))))

(defvar ess-fill--orig-pos nil
  "Original position of cursor.")

(defvar ess-fill--orig-state nil
  "Backup of original code to cycle back to original state.")

(defvar ess-fill--second-state nil
  "Backup of code produce by very first cycling.
If this is equal to orig-state, no need to cycle back to original
state.")

(defvar ess-fill--style-level nil
  "Filling style used in last cycle.")

(defun ess-fill--substring (bounds)
  (buffer-substring (car bounds) (marker-position (cadr bounds))))

;; Detect repeated commands
(defun ess-fill-style (type bounds)
  (let ((max-level
         ;; This part will be simpler once we have the style alist
         (cond ((eq type 'calls)
                ;; No third style either when ess-offset-arguments is
                ;; set to 'open-delim, or when ess-fill-calls-newlines
                ;; is nil and no numeric prefix is given
                (if (and (not (eq (ess-offset-type 'arguments)
                                  'open-delim))
                         (or ess-fill-calls-newlines
                             (numberp current-prefix-arg)))
                    3
                  2))
               ((eq type 'continuations)
                2))))
    (if (not (memq last-command '(fill-paragraph-or-region
                                  fill-paragraph)))
        (progn
          ;; Record original state on first cycling
          (setq ess-fill--orig-state (ess-fill--substring bounds))
          (setq ess-fill--orig-pos (point))
          (setq ess-fill--second-state nil)
          (setq ess-fill--style-level 1))
      ;; Also record state on second cycling
      (when (and (= ess-fill--style-level 1)
                 (null ess-fill--second-state))
        (setq ess-fill--second-state (ess-fill--substring bounds)))
      (cond ((>= ess-fill--style-level max-level)
             (let ((same-last-and-orig (string= (ess-fill--substring bounds)
                                                ess-fill--orig-state))
                   (same-2nd-and-orig (string= ess-fill--orig-state
                                               ess-fill--second-state)))
               ;; Avoid cycling to the same state twice
               (cond ((and same-last-and-orig
                           same-2nd-and-orig)
                      (setq ess-fill--style-level 2))
                     ((or same-last-and-orig
                          same-2nd-and-orig)
                      (setq ess-fill--style-level 1))
                     (t
                      (setq ess-fill--style-level 0)))))
            (ess-fill--style-level
             (setq ess-fill--style-level (1+ ess-fill--style-level))))))
  ess-fill--style-level)

(let (_)
  ;; FIXME: Transform these dynamic bindings to a state object
  (defvar ess--infinite)
  (defvar ess--prefix-break)
  (defvar ess--start-pos)
  (defvar ess--last-pos)
  (defvar ess--last-newline)

  (declare-function ess-fill-args--roll-lines "ess-r-mode")

  (defun ess-fill-args (&optional style)
    (let ((ess--start-pos (point-min))
          (bounds (ess-args-bounds 'marker))
          ;; Set undo boundaries manually
          (undo-inhibit-record-point t)
          ess--last-pos ess--last-newline ess--prefix-break
          ess--infinite)
      (when (not bounds)
        (error "Could not find function bounds"))
      (setq style (or style (ess-fill-style 'calls bounds)))
      (if (= style 0)
          (progn
            (delete-region (car bounds) (marker-position (cadr bounds)))
            (insert ess-fill--orig-state)
            ;; Restore the point manually. (save-excursion) wouldn't
            ;; work here because we delete the text rather than just
            ;; modifying it.
            (goto-char ess-fill--orig-pos)
            (message "Back to original formatting"))
        (when ess-blink-refilling
          (ess-blink-region (nth 2 bounds)
                            (1+ (marker-position (cadr bounds)))))
        (undo-boundary)
        (save-excursion
          (ess-fill--unroll-lines bounds t)
          (cond
           ;; Some styles start with first argument on a newline
           ((and (memq style '(2 4))
                 ess-fill-calls-newlines
                 (not (looking-at "[ \t]*#")))
            (newline-and-indent))
           ;; Third level, start a newline after N arguments
           ((and (= style 3)
                 (not (looking-at "[ \t]*#")))
            (let ((i (if (numberp current-prefix-arg)
                         current-prefix-arg
                       1)))
              (while (and (> i 0)
                          (ess-jump-arg)
                          (ess-jump-char ","))
                (setq i (1- i))))
            (newline-and-indent)))
          (ess-fill-args--roll-lines style)
          ;; Reindent surrounding context
          (ess-indent-call (car bounds)))
        ;; Signal marker for garbage collection
        (set-marker (cadr bounds) nil)
        (undo-boundary))))

  (defun ess-fill-args--roll-lines (style)
    (while (and (not (looking-at "[])]"))
                (/= (point) (or ess--last-pos 1))
                (not ess--infinite))
      (setq ess--prefix-break nil)
      ;; Record ess--start-pos as future breaking point to avoid breaking
      ;; at `=' sign
      (while (looking-at "[ \t]*[\n#]")
        (forward-line)
        (back-to-indentation))
      (setq ess--start-pos (point))
      (while (and (< (current-column) fill-column)
                  (not (looking-at "[])]"))
                  (/= (point) (or ess--last-pos 1))
                  ;; Break after one pass if prefix is active
                  (not ess--prefix-break))
        (when (memq style '(2 3))
          (setq ess--prefix-break t))
        (ess-jump-token ",")
        (setq ess--last-pos (point))
        ;; Jump expression and any continuations. Reindent all lines
        ;; that were jumped over
        (let ((cur-line (line-number-at-pos))
              end-line)
          (cond ((ess-jump-arg)
                 (setq ess--last-newline nil))
                ((ess-token-after= ",")
                 (setq ess--last-newline nil)
                 (setq ess--last-pos (1- (point)))))
          (save-excursion
            (when (< cur-line (line-number-at-pos))
              (setq end-line (line-number-at-pos))
              (ess-goto-line (1+ cur-line))
              (while (and (<= (line-number-at-pos) end-line)
                          (/= (point) (point-max)))
                (funcall indent-line-function)
                (forward-line))))))
      (when (or (>= (current-column) fill-column)
                ess--prefix-break
                ;; Ensures closing delim on a newline
                (and (= style 4)
                     (looking-at "[ \t]*[])]")
                     (setq ess--last-pos (point))))
        (if (and ess--last-pos (/= ess--last-pos ess--start-pos))
            (goto-char ess--last-pos)
          (ess-jump-char ","))
        (cond ((looking-at "[ \t]*[#\n]")
               (forward-line)
               (funcall indent-line-function)
               (setq ess--last-newline nil))
              ;; With levels 2 and 3, closing delim goes on a newline
              ((looking-at "[ \t]*[])]")
               (when (and (memq style '(2 3 4))
                          ess-fill-calls-newlines
                          (not ess--last-newline))
                 (newline-and-indent)
                 ;; Prevent indenting infinitely
                 (setq ess--last-newline t)))
              ((not ess--last-newline)
               (newline-and-indent)
               (setq ess--last-newline t))
              (t
               (setq ess--infinite t)))))))

(defun ess-fill-continuations (&optional style)
  (let ((bounds (ess-continuations-bounds 'marker))
        (undo-inhibit-record-point t)
        (last-pos (point-min))
        last-newline infinite)
    (when (not bounds)
      (error "Could not find statements bounds"))
    (setq style (or style (ess-fill-style 'continuations bounds)))
    (if (= style 0)
        (progn
          (delete-region (car bounds) (marker-position (cadr bounds)))
          (insert ess-fill--orig-state)
          (goto-char ess-fill--orig-pos)
          (message "Back to original formatting"))
      (when ess-blink-refilling
        (ess-blink-region (car bounds) (marker-position (cadr bounds))))
      (undo-boundary)
      (save-excursion
        (ess-fill--unroll-lines bounds)
        (while (and (< (point) (cadr bounds))
                    (/= (point) (or last-pos 1))
                    (not infinite))
          (setq last-pos (point))
          (when (and (ess-jump-expression)
                     (indent-according-to-mode)
                     (not (> (current-column) fill-column)))
            (setq last-newline nil))
          (ess-jump-operator)
          (if (or (and (> (current-column) fill-column)
                       (goto-char last-pos))
                  (= style 2))
              (progn
                (ess-jump-operator)
                (unless (= (point) (cadr bounds))
                  (when last-newline
                    (setq infinite t))
                  (newline-and-indent)
                  (setq last-newline t)))
            (setq last-newline nil)))
        (ess-indent-call (car bounds)))
      (set-marker (cadr bounds) nil)
      (undo-boundary))))



;;;*;;; Inferior R mode

(defvar inferior-ess-r-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "\M-\r" #'ess-dirs)
    (define-key map (kbd "C-c C-=") #'ess-cycle-assign)
    (define-key map (kbd "C-c C-.") 'ess-rutils-map)
    map)
  "Keymap for `inferior-ess-r-mode'.")

;; TOTHINK: Prevent string delimiting characters from messing up output in the
;; inferior buffer
(defvar inferior-ess-r-mode-syntax-table
  (let ((table (copy-syntax-table ess-r-mode-syntax-table)))
    (modify-syntax-entry ?% "." table)
    (modify-syntax-entry ?\' "." table)
    table)
  "Syntax table for `inferior-ess-r-mode'.")

(define-derived-mode inferior-ess-r-mode inferior-ess-mode "iESS"
  "Major mode for interacting with inferior R processes."
  :group 'ess-proc
  (ess-setq-vars-local ess-r-customize-alist)
  (setq-local ess-font-lock-keywords 'inferior-ess-r-font-lock-keywords)
  (setq-local font-lock-syntactic-face-function #'ess-r-font-lock-syntactic-face-function)
  (setq-local comint-process-echoes (eql ess-eval-visibly t))
  (setq-local comint-prompt-regexp inferior-S-prompt)
  (setq-local syntax-propertize-function ess-r--syntax-propertize-function)
  (setq comint-input-sender 'inferior-ess-r-input-sender)
  (remove-hook 'completion-at-point-functions #'ess-filename-completion 'local) ;; should be first
  (add-hook 'completion-at-point-functions #'ess-r-object-completion nil 'local)
  (add-hook 'completion-at-point-functions #'ess-filename-completion nil 'local)
  (add-hook 'xref-backend-functions #'ess-r-xref-backend nil 'local)
  (add-hook 'project-find-functions #'ess-r-project nil 'local)
  ;; eldoc
  (ess--setup-eldoc #'ess-r-eldoc-function)
  ;; auto-complete
  (ess--setup-auto-complete ess-r-ac-sources t)
  ;; company
  (ess--setup-company ess-r-company-backends t)
  (setq comint-get-old-input #'inferior-ess-get-old-input)
  (add-hook 'comint-input-filter-functions #'ess-search-path-tracker nil 'local))



;;;*;;; R Help mode

(defvar ess-r-help-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map (make-composed-keymap button-buffer-map
                                                 ess-help-mode-map))
    (define-key map "s<" #'beginning-of-buffer)
    (define-key map "s>" #'end-of-buffer)
    (define-key map "sa" #'ess-skip-to-help-section)
    (define-key map "sd" #'ess-skip-to-help-section)
    (define-key map "sD" #'ess-skip-to-help-section)
    (define-key map "st" #'ess-skip-to-help-section)
    (define-key map "se" #'ess-skip-to-help-section)
    (define-key map "sn" #'ess-skip-to-help-section)
    (define-key map "sr" #'ess-skip-to-help-section)
    (define-key map "ss" #'ess-skip-to-help-section)
    (define-key map "su" #'ess-skip-to-help-section)
    (define-key map "sv" #'ess-skip-to-help-section)
    map)
  "Keymap for `ess-r-help-mode'.")

(cl-defmethod ess--help-major-mode (&context (ess-dialect "R"))
  (ess-r-help-mode))

(define-derived-mode ess-r-help-mode ess-help-mode "R Help"
  "Major mode for help buffers."
  :group 'ess-help
  (setq ess-dialect "R"
        ess-help-sec-regex ess-help-r-sec-regex
        ess-help-sec-keys-alist ess-help-r-sec-keys-alist ; TODO: Still necessary?
        inferior-ess-help-command inferior-ess-r-help-command)
  (ess-r-help--add-links))

(define-button-type 'ess-r-help--link
  'follow-link t
  'action (lambda (_) (ess-r-help--button-action)))

(defun ess-r-help--button-action ()
  "Display help for button at point."
  (let ((text (get-text-property (point) 'ess-r-help--link-text)))
    (ess-display-help-on-object text)))

(defun ess-r-help--add-links ()
  "Add links to the help buffer."
  (let ((links (when (ess-process-live-p)
                 (ess-get-words-from-vector
                  (ess-r--format-call
                   ".ess.helpLinks('%s' %s)\n"
                   ess-r-help--local-object
                   (ess-r-arg "package" ess-r-help--local-package t)))))
        (inhibit-read-only t))
    (save-excursion
      ;; Search for fancy quotes only. If users have
      ;; options(useFancyQuotes) set to something other than TRUE this
      ;; probably won't work. If it's FALSE, R outputs ascii ', but
      ;; searching through the whole buffer takes too long.
      (while (re-search-forward "‘\\([^[:space:]]+?\\)’" nil t)
        (let* ((text (match-string 1))
               (text-stripped (if (string-match-p ".*()\\'" text)
                                  (substring text nil (- (length text) 2))
                                text)))
          (when (member text-stripped links)
            (delete-region (match-beginning 0) (match-end 0))
            (insert-text-button text
                                'ess-r-help--link-text text-stripped
                                'type 'ess-r-help--link
                                'help-echo (format "mouse-2, RET: Help on %s" text))))))))

(cl-defmethod ess--display-vignettes-override (all &context (ess-dialect "R"))
  "Display R vignettes in ess-help-like buffer..
With (prefix) ALL non-nil, use `vignette(*, all=TRUE)`, i.e.,
from all installed packages, which can be very slow."
  (inferior-ess-r-force)
  (let* ((vslist (with-current-buffer
                     (ess-command
                      (format ".ess_vignettes(%s)\n" (if all "TRUE" "")))
                   (goto-char (point-min))
                   (when (re-search-forward "(list" nil t)
                     (goto-char (match-beginning 0))
                     (ignore-errors (eval (read (current-buffer)) t)))))
         (proc-name ess-current-process-name)
         (alist ess-local-customize-alist)
         (remote (file-remote-p default-directory))
         (buff (get-buffer-create (format "*[%s]vignettes*" ess-dialect)))
         (inhibit-modification-hooks t)
         (inhibit-read-only t))
    (with-current-buffer buff
      (setq buffer-read-only nil)
      (delete-region (point-min) (point-max))
      (ess-setq-vars-local (eval alist t))
      (setq ess-local-process-name proc-name)
      (ess--help-major-mode)
      (setq ess-help-sec-regex "^\\w+:$"
            ess-help-type 'vignettes)
      (set-buffer-modified-p 'nil)
      (goto-char (point-min))
      (dolist (el vslist)
        (let ((pack (car el)))
          (insert (format "\n\n%s:\n\n" (propertize pack 'face 'underline)))
          (dolist (el2 (cdr el))
            (let ((path (if remote
                            (with-no-warnings
                              ;; Have to wrap this in with-no-warnings because
                              ;; otherwise the byte compiler complains about
                              ;; calling tramp-make-tramp-file-name with an
                              ;; incorrect number of arguments on Both 26+ and 25 emacses.
                              (if (>= emacs-major-version 26)
                                  (with-parsed-tramp-file-name default-directory nil
                                    (tramp-make-tramp-file-name method user domain host port (nth 1 el2)))
                                (with-parsed-tramp-file-name default-directory nil
                                  (tramp-make-tramp-file-name method user host (nth 1 el2)))))
                          (nth 1 el2))))
              (insert-text-button "doc"
                                  'mouse-face 'highlight
                                  'action (if remote
                                              #'ess--action-open-in-emacs
                                            #'ess--action-R-open-vignette)
                                  'follow-link t
                                  'vignette (file-name-sans-extension (nth 2 el2))
                                  'package pack
                                  'help-echo (concat path "/doc/" (nth 2 el2)))
              (insert " ")
              (insert-text-button "source"
                                  'mouse-face 'highlight
                                  'action #'ess--action-open-in-emacs
                                  'follow-link t
                                  'help-echo (concat path "/doc/" (nth 3 el2)))
              (insert " ")
              (insert-text-button "R"
                                  'mouse-face 'highlight
                                  'action #'ess--action-open-in-emacs
                                  'follow-link t
                                  'help-echo (concat path "/doc/" (nth 4 el2)))
              (insert (format "\t%s\n" (nth 0 el2)))))))
      (goto-char (point-min))
      (insert (propertize "\t\t**** Vignettes ****\n" 'face 'bold-italic))
      (unless (eobp) (delete-char 1))
      (setq buffer-read-only t))
    (ess-display-help buff)))



;; Support for listing R packages

(define-obsolete-variable-alias 'ess-rutils-buf 'ess-r-package-menu-buf "ESS 19.04")
(define-obsolete-variable-alias 'ess-rutils-mode-map 'ess-r-package-menu-mode-map "ESS 19.04")
(define-obsolete-function-alias 'ess-rutils-mode #'ess-r-package-menu-mode "ESS 19.04")

(defvar ess-rutils-map
  (let ((map (define-prefix-command 'ess-rutils-map)))
    (define-key map "l" #'ess-r-package-list-local-packages)
    (define-key map "r" #'ess-r-package-list-available-packages)
    (define-key map "u" #'ess-r-package-update-packages)
    (define-key map "a" #'ess-display-help-apropos)
    (define-key map "m" #'ess-rutils-rm-all)
    (define-key map "o" #'ess-rdired)
    (define-key map "w" #'ess-rutils-load-workspace)
    (define-key map "s" #'ess-rutils-save-workspace)
    (define-key map "d" #'ess-change-directory)
    (define-key map "H" #'ess-rutils-html-docs)
    map))

(easy-menu-define ess-rutils-mode-menu inferior-ess-mode-menu
  "Package management."
  '("Package management"
    ["List local packages" ess-r-package-list-local-packages t]
    ["List available packages" ess-r-package-list-available-packages t]
    ["Update packages" ess-r-package-update-packages t]))

(easy-menu-add-item inferior-ess-mode-menu nil ess-rutils-mode-menu "Utils")
(easy-menu-add-item ess-mode-menu nil ess-rutils-mode-menu "Process")

(defvar ess-r-package-menu-buf "*R packages*"
  "Name of buffer to display R packages in.")

(defvar ess-r-package-menu-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "l" #'ess-r-package-load)
    (define-key map "i" #'ess-r-package-mark-install)
    (define-key map "x" #'ess-r-package-execute-marks)
    (define-key map "u" #'ess-r-package-unmark)
    map)
  "Keymap for `ess-rutils-mode'.")

(define-derived-mode ess-r-package-menu-mode tabulated-list-mode "R utils"
  "Major mode for `ess-rutils-local-pkgs' and `ess-rutils-repos-pkgs'."
  :group 'ess-R
  (setq ess-dialect "R")
  (setq mode-name (concat "R packages: " ess-local-process-name))
  (setq tabulated-list-padding 2)
  (setq tabulated-list-format
        `[("Name" 10 t)
          ("Description" 50 nil)
          ("Version" 5 t)])
  (tabulated-list-init-header))

(define-obsolete-function-alias 'ess-rutils-local-pkgs #'ess-r-package-list-local-packages "ESS 19.04")

(defun ess-r-package-list-local-packages ()
  "List all packages in all libraries."
  (interactive)
  (ess-r-package--list-packages (concat ".ess.rutils.ops <- options(width = 10000);"
                                        "print(installed.packages(fields=c(\"Title\"))[, c(\"Title\", \"Version\")]);"
                                        "options(.ess.rutils.ops); rm(.ess.rutils.ops);"
                                        "\n")))

(defun ess-r-package--list-packages (cmd)
  "Use CMD to list packages."
  (let ((process ess-local-process-name)
        des-col-beginning des-col-end entries)
    (with-current-buffer (ess-command cmd (get-buffer-create " *ess-rutils-pkgs*"))
      (goto-char (point-min))
      (delete-region (point) (1+ (line-end-position)))
      ;; Now we have a buffer with package name, description, and
      ;; version. description and version are surrounded by quotes,
      ;; description is separated by whitespace.
      (re-search-forward "\\>[[:space:]]+")
      (setq des-col-beginning (current-column))
      (goto-char (line-end-position))
      ;; Unless someone has a quote character in their package version,
      ;; two quotes back will be the end of the package description.
      (dotimes (_ 2) (search-backward "\""))
      (re-search-backward "[[:space:]]*")
      (setq des-col-end (current-column))
      (beginning-of-line)
      (while (not (eobp))
        (beginning-of-line)
        (let* ((name (string-trim (buffer-substring
                                   (point)
                                   (progn (forward-char (1- des-col-beginning))
                                          (point)))))
               (description (string-trim (buffer-substring
                                          (progn (forward-char 1)
                                                 (point))
                                          (progn (forward-char (- des-col-end des-col-beginning))
                                                 (point)))))
               (version (buffer-substring
                         (progn (end-of-line)
                                (search-backward "\"")
                                (search-backward "\"")
                                (forward-char 1)
                                (point))
                         (progn (search-forward "\"")
                                (backward-char 1)
                                (point)))))
          (push
           (list name
                 `[(,name
                    help-echo "mouse-2, RET: help on this package"
                    action ess-rutils-help-on-package)
                   ,description
                   ,version])
           entries)
          (forward-line)))
      (pop-to-buffer ess-rutils-buf)
      (setq ess-local-process-name process)
      (setq tabulated-list-entries entries)
      (ess-r-package-menu-mode)
      (tabulated-list-print))))

(define-obsolete-function-alias 'ess-rutils-loadpkg #'ess-r-package-load "ESS 19.04")
(defun ess-r-package-load ()
  "Load package from a library."
  (interactive)
  (ess-execute (concat "library('" (tabulated-list-get-id)
                       "', character.only = TRUE)")
               'buffer))

(defun ess-rutils-help-on-package (&optional _button)
  "Display help on the package at point."
  (interactive)
  ;; FIXME: Should go to a help buffer
  (ess-execute (concat "help(" (tabulated-list-get-id) ", package = '"
                       (tabulated-list-get-id)"')")
               'buffer))

(define-obsolete-function-alias 'ess-rutils-repos-pkgs #'ess-r-package-list-available-packages "ESS 19.04")
(defun ess-r-package-list-available-packages ()
  "List available packages.
Use the repositories as listed by getOptions(\"repos\") in the
current R session."
  (interactive)
  (ess-r-package--list-packages
   "{
       .ess.rutils.ops <- options(width = 10000)
       print(available.packages(fields=c(\"Title\"))[, c(\"Title\", \"Version\")])
       options(.ess.rutils.ops); rm(.ess.rutils.ops)
    }\n"))

(define-obsolete-function-alias 'ess-rutils-mark-install #'ess-r-package-mark-install "ESS 19.04")
(defun ess-r-package-mark-install ()
  "Mark the current package for installing."
  (interactive)
  (tabulated-list-put-tag "i" t))

(define-obsolete-function-alias 'ess-rutils-unmark #'ess-r-package-unmark "ESS 19.04")
(defun ess-r-package-unmark ()
  "Unmark the packages."
  (interactive)
  (tabulated-list-put-tag " " t))

(define-obsolete-function-alias 'ess-rutils-execute-marks #'ess-r-package-execute-marks "ESS 19.04")
(defun ess-r-package-execute-marks ()
  "Perform all marked actions."
  (interactive)
  ;; Install
  (save-excursion
    (let ((cmd "install.packages(c(")
          pkgs)
      (goto-char (point-min))
      (while (not (eobp))
        (when (looking-at-p "i")
          (setq pkgs (concat "\"" (tabulated-list-get-id) "\", " pkgs))
          (tabulated-list-put-tag " "))
        (forward-line))
      (if pkgs
          (progn (setq pkgs (substring pkgs 0 (- (length pkgs) 2)))
                 (setq cmd (concat cmd pkgs "))"))
                 (ess-execute cmd 'buffer))
        (message "No packages marked for install")))))

(define-obsolete-function-alias 'ess-rutils-update-pkgs #'ess-r-package-update-packages "ESS 19.04")
(defun ess-r-package-update-packages (lib repo)
  "Update packages in library LIB and repo REPO.
This also uses checkBuilt=TRUE to rebuild installed packages if
needed."
  (interactive
   (list (ess-completing-read "Library to update: " (ess-get-words-from-vector
                                                     "as.character(.libPaths())\n"))
         (ess-completing-read "Repo: " (ess-get-words-from-vector
                                        "as.character(getOption(\"repos\"))\n"))))
  (ess-execute (format "update.packages(lib.loc='%s', repos='%s', ask=FALSE, checkBuilt=TRUE)" lib repo) 'buffer))

(define-obsolete-function-alias 'ess-rutils-apropos #'ess-display-help-apropos "ESS 19.04")

;; Miscellaneous helper functions

(defun ess-rutils-rm-all ()
  "Remove all R objects."
  (interactive)
  (when (y-or-n-p "Delete all objects? ")
    (ess-execute "rm(list=ls())" 'buffer)))

(defun ess-rutils-load-workspace (file)
  "Load workspace FILE into R."
  (interactive "fFile with workspace to load: ")
  (ess-execute (concat "load('" file "')") 'buffer))
(define-obsolete-function-alias 'ess-rutils-load-wkspc #'ess-rutils-load-workspace "ESS 19.04")

(defun ess-rutils-save-workspace (file)
  "Save FILE workspace as file.RData."
  (interactive "FSave workspace to file (no extension): ")
  (ess-execute (concat "save.image('" file ".RData')") 'buffer))
(define-obsolete-function-alias 'ess-rutils-save-wkspc #'ess-rutils-save-workspace "ESS 19.04")

(defun ess-rutils-quit ()
  "Kill the ess-rutils buffer and return to the iESS buffer."
  (interactive)
  (ess-switch-to-end-of-ESS)
  (kill-buffer ess-rutils-buf))

(defun ess-rutils-html-docs (&optional remote)
  "Use `browse-url' to navigate R html documentation.
Documentation is produced by a modified help.start(), that
returns the URL produced by GNU R's http server. If called with a
prefix, the modified help.start() is called with update=TRUE. The
optional REMOTE argument should be a string with a valid URL for
the 'R_HOME' directory on a remote server (defaults to NULL)."
  (interactive)
  (let* ((update (if current-prefix-arg "update=TRUE" "update=FALSE"))
         (remote (if (or (and remote (not (string= "" remote))))
                     (concat "remote=" remote) "remote=NULL"))
         (proc ess-local-process-name)
         (rhtml (format ".ess_help_start(%s, %s)\n" update remote)))
    (with-temp-buffer
      (ess-command rhtml (current-buffer) nil nil nil (get-process proc))
      (let* ((begurl (search-backward "http://"))
             (endurl (search-forward "index.html"))
             (url (buffer-substring-no-properties begurl endurl)))
        (browse-url url)))))

(defun ess-rutils-rsitesearch (string)
  "Search the R archives for STRING, and show results using `browse-url'.
If called with a prefix, options are offered (with completion)
for matches per page, sections of the archives to search,
displaying results in long or short formats, and sorting by any
given field. Options should be separated by value of
`crm-default-separator'."
  (interactive "sSearch string: ")
  (let ((site "https://search.r-project.org/cgi-bin/namazu.cgi?query=")
        (okstring (replace-regexp-in-string " +" "+" string)))
    (browse-url
     (if current-prefix-arg
        (let ((mpp (concat
                    "&max="
                    (completing-read
                     "Matches per page: "
                     '(("20" 1) ("30" 2) ("40" 3) ("50" 4) ("100" 5)))))
              (format (concat
                       "&result="
                       (completing-read
                        "Format: " '(("normal" 1) ("short" 2))
                        nil t "normal" nil "normal")))
              (sortby (concat
                       "&sort="
                       (completing-read
                        "Sort by: "
                        '(("score" 1) ("date:late" 2) ("date:early" 3)
                          ("field:subject:ascending" 4)
                          ("field:subject:descending" 5)
                          ("field:from:ascending" 6) ("field:from:descending" 7)
                          ("field:size:ascending" 8) ("field:size:descending" 9))
                        nil t "score" nil "score")))
              (restrict (concat
                         "&idxname="
                         (mapconcat
                          #'identity
                          (completing-read-multiple
                           "Limit search to: "
                           '(("Rhelp02a" 1) ("functions" 2)
                             ("docs" 3) ("Rhelp01" 4))
                           nil t "Rhelp02a,functions,docs" nil
                           "Rhelp02a,functions,docs")
                          "&idxname="))))
          (concat site okstring mpp format sortby restrict))
       (concat site okstring "&max=20&result=normal&sort=score"
               "&idxname=Rhelp02a&idxname=functions&idxname=docs")))))

(defun ess-rutils-help-search (string)
  "Search for STRING using help.search()."
  (interactive "sString to search for? ")
  (let ((proc ess-local-process-name))
    (pop-to-buffer "foobar")
    (ess-command (concat "help.search('" string "')\n")
                 (current-buffer) nil nil nil (get-process proc))))

(make-obsolete 'ess-rutils-rhtml-fn "overwrite .ess_help_start instead." "ESS 18.10")


;; Create functions that can be called for running different versions
;; of R.
;; FIXME: Should be set in ess-custom
(setq ess-rterm-version-paths
      (ess-flatten-list
       (delete-dups
        (if (not ess-directory-containing-R)
            (if (getenv "ProgramW6432")
                (let ((P-1 (getenv "ProgramFiles(x86)"))
                      (P-2 (getenv "ProgramW6432")))
                  (nconc
                   ;; Always 32 on 64 bit OS, nil on 32 bit OS
                   (ess-find-rterm (concat P-1 "/R/") "bin/Rterm.exe")
                   (ess-find-rterm (concat P-1 "/R/") "bin/i386/Rterm.exe")

                   ;; Keep this both for symmetry and because it can happen:
                   (ess-find-rterm (concat P-1 "/R/") "bin/x64/Rterm.exe")

                   ;; Always 64 on 64 bit OS, nil on 32 bit OS
                   (ess-find-rterm (concat P-2 "/R/") "bin/Rterm.exe")
                   (ess-find-rterm (concat P-2 "/R/") "bin/i386/Rterm.exe")
                   (ess-find-rterm (concat P-2 "/R/") "bin/x64/Rterm.exe")))
              (let ((PF (getenv "ProgramFiles")))
                (nconc
                 ;; Always 32 on 32 bit OS, depends on 32 or 64 process on 64 bit OS
                 (ess-find-rterm (concat PF "/R/") "bin/Rterm.exe")
                 (ess-find-rterm (concat PF "/R/") "bin/i386/Rterm.exe")
                 (ess-find-rterm (concat PF "/R/") "bin/x64/Rterm.exe"))))
          (let ((PF ess-directory-containing-R))
            (nconc
             (ess-find-rterm (concat PF "/R/") "bin/Rterm.exe")
             (ess-find-rterm (concat PF "/R/") "bin/i386/Rterm.exe")
             (ess-find-rterm (concat PF "/R/") "bin/x64/Rterm.exe")))))))
(ess-r-define-runners)

;;*;; Provide and auto-loads

;;;###autoload
(add-to-list 'auto-mode-alist '("/Makevars\\(\\.win\\)?\\'" . makefile-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("DESCRIPTION\\'" . conf-colon-mode))

(provide 'ess-r-mode)

;;; ess-r-mode.el ends here
