= Installation

NOTE: Projectile officially supports Emacs 26.1+.

The recommended way to install Projectile is via `package.el`.

== Prerequisites

You'll need to have Emacs installed (preferably the latest stable
release). If you're new to Emacs you might want to go through
https://www.gnu.org/software/emacs/tour/index.html[the guided tour of Emacs]
and the built-in tutorial (just press kbd:[C-h t]).

== Installation via package.el

Projectile is available on all major `package.el` community
maintained repos -
https://elpa.nongnu.org[NonGNU ELPA],
http://stable.melpa.org[MELPA Stable]
and http://melpa.org[MELPA].

You can install Projectile with the following command:

kbd:[M-x] `package-install` kbd:[RET] `projectile` kbd:[RET]

or by adding this bit of Emacs Lisp code to your Emacs initialization file
(`.emacs` or `init.el`):

[source,elisp]
----
(unless (package-installed-p 'projectile)
  (package-install 'projectile))
----

If the installation doesn't work try refreshing the package list:

kbd:[M-x] `package-refresh-contents` kbd:[RET]

Keep in mind that MELPA packages are built automatically from
the `master` branch, meaning bugs might creep in there from time to
time. Never-the-less, installing from MELPA is a reasonable way of
obtaining Projectile, as the `master` branch is normally quite stable
and serious regressions there are usually fixed pretty quickly.

TIP: If you don't want to (or can't) wait for MELPA to rebuild Projectile,
 you can easily build and install an up-to-date MELPA package locally yourself. Check out
 http://emacsredux.com/blog/2015/05/10/building-melpa-packages-locally/[this article]
 for details on the subject.

Generally, users of the non-adventurous kind are advised to stick
with the stable releases, available from NonGNU ELPA and MELPA Stable.
You can pin Projectile to always use MELPA
Stable by adding this to your Emacs initialization:

[source,elisp]
----
(add-to-list 'package-pinned-packages '(projectile . "melpa-stable") t)
----

Finally add this to your Emacs config:

[source,elisp]
----
(require 'projectile)
;; Recommended keymap prefix on macOS
(define-key projectile-mode-map (kbd "s-p") 'projectile-command-map)
;; Recommended keymap prefix on Windows/Linux
(define-key projectile-mode-map (kbd "C-c p") 'projectile-command-map)
(projectile-mode +1)
----

NOTE: Those keymap prefixes are just a suggestion. Feel free to put
 there whatever works best for you.
 `C-c p` used to be the default prefix up to version 2.0, but
 starting with version 2.0 you have to select prefix key(s)
 yourself.

== Installation via use-package

`use-package` is a popular way to install and configure Projectile.

If you wanted to install the version of Projectile which is what is to be found in
the `master` branch, declare the following in your Emacs initialization file
(`.emacs` or `init.el`):

[source,elisp]
----
(use-package projectile
  :ensure t
  :init
  (projectile-mode +1)
  :bind (:map projectile-mode-map
              ("s-p" . projectile-command-map)
              ("C-c p" . projectile-command-map)))
----

However, if you wanted to be a bit more conservative and only use the stable
releases of Projectile, you'd declare the following:

[source,elisp]
----
(use-package projectile
  :ensure t
  :pin melpa-stable
  :init
  (projectile-mode +1)
  :bind (:map projectile-mode-map
              ("s-p" . projectile-command-map)
              ("C-c p" . projectile-command-map)))
----

After placing one of the above s-expressions, evaluate it, for it to take effect
by entering: kbd:[C-x C-e].

For further configuration options with `use-package`, consult the
official https://github.com/jwiegley/use-package[use-package repository].

== Installation via el-get

Projectile is also available for installation from
the https://github.com/dimitri/el-get[el-get] package manager.

Provided you've already installed `el-get` you can install Projectile with the
following command:

kbd:[M-x] `el-get-install` kbd:[RET] `projectile` kbd:[RET]

== Installation on Debian and Ubuntu

Users of Debian 9 or later or Ubuntu 16.10 or later may simply
`apt-get install elpa-projectile`.

Your favourite Linux distribution might be providing a Projectile package as well.

== Emacs Prelude

Projectile is bundled with
https://github.com/bbatsov/prelude[Emacs Prelude]. If you're a Prelude
user, Projectile is already properly configured and ready for
action.
