#!/bin/bash
#
# This file is part of the GROMACS molecular simulation package.
#
# Copyright 2014- The GROMACS Authors
# and the project initiators Erik Lindahl, Berk Hess and David van der Spoel.
# Consult the AUTHORS/COPYING files and https://www.gromacs.org for details.
#
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# The build and source folder can be specified with -B and -S respectively.
# By default it assume "-B. -S..".
# include-what-you-use needs to be in the path. Add --apply if you want
# changes to be applied.  Any extra arguments are added as is to the
# command (can be used for extra defines or include paths).

filename=
build_path=.
src_path=..
cmd="include-what-you-use -DHAVE_CONFIG_H -mavx"

# Read all special arguments and add others to the command
apply=0
for arg in "$@"; do
    if [ $arg == "--apply" ]; then
	apply=1
    elif [[ $arg == -[SB] ]]; then
	echo -S and -B require an argument
	exit 1
    elif [[ $arg == -B* ]]; then
	build_path=${arg:2}
    elif [[ $arg == -S* ]]; then
	src_path=${arg:2}
    elif [[ $arg != -* ]]; then
	if [ "$filename" == "" ]; then
	    filename=$arg
	else
	    echo "This script can only be run on one file at a time"
	    exit 1
	fi
    else
	cmd="$cmd $arg"
    fi
done

if [ "$filename" == "" ]; then
    echo "No file specified"
    exit 1
fi

# We cannot detect whether it is a C++ or C header. Should be fine to always use C++
if [ "${filename##*.}" == "h" ]; then
    cmd="$cmd -x c++"
fi

cmd="$cmd $filename"

# Always use C++11.
if [ "${filename##*.}" == "cpp" -o "${filename##*.}" == "h" ]; then
    cmd="$cmd -std=c++11"
fi

# keep gmxpre.h for source files
if [ "${filename##*.}" == "cpp" -o "${filename##*.}" == "c" ]; then
    cmd="$cmd  -Xiwyu --pch_in_code -Xiwyu --prefix_header_includes=keep"
fi

if [ $src_path == "." ]; then
    src_folder="src" # ./src confuses IWYU
else
    src_folder="$src_path/src"
fi

cmd="$cmd -I${src_folder} -I${src_folder}/external/thread_mpi/include
     -I$build_path/src -I${src_folder}/external/boost
     -Xiwyu --mapping_file=${src_path}/admin/iwyu.imp"

if [ $apply -eq 1 ] ; then
    cmd="$cmd 2>&1 | fix_includes.py --nosafe_headers"
fi

eval $cmd
