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#!/usr/bin/env bash
# git pre-commit hook that runs a clang-format stylecheck.
# Features:
# - abort commit when commit does not comply with the style guidelines
# - create a patch of the proposed style changes
# Modifications for clang-format by rene.milk@wwu.de
# This file is part of a set of unofficial pre-commit hooks available
# at github.
# Link: https://github.com/githubbrowser/Pre-commit-hooks
# Contact: David Martin, david.martin.mailbox@googlemail.com
# Some quality of life modifications made for Godot Engine.
##################################################################
# SETTINGS
# Set path to clang-format binary.
CLANG_FORMAT=`which clang-format 2>/dev/null`
# Remove any older patches from previous commits. Set to true or false.
DELETE_OLD_PATCHES=false
# Only parse files with the extensions in FILE_EXTS. Set to true or false.
# If false every changed file in the commit will be parsed with clang-format.
# If true only files matching one of the extensions are parsed with clang-format.
PARSE_EXTS=true
# File types to parse. Only effective when PARSE_EXTS is true.
FILE_EXTS=".c .h .cpp .hpp .cc .hh .cxx .m .mm .inc .java .glsl"
# Use pygmentize instead of cat to parse diff with highlighting.
# Install it with `pip install pygments` (Linux) or `easy_install Pygments` (Mac)
PYGMENTIZE=`which pygmentize 2>/dev/null`
if [ ! -z "$PYGMENTIZE" ]; then
READER="pygmentize -l diff"
else
READER=cat
fi
# Path to zenity
ZENITY=`which zenity 2>/dev/null`
# Path to xmessage
XMSG=`which xmessage 2>/dev/null`
# Path to powershell (Windows only)
PWSH=`which powershell 2>/dev/null`
##################################################################
# There should be no need to change anything below this line.
. "$(dirname -- "$0")/canonicalize_filename.sh"
# exit on error
set -e
# check whether the given file matches any of the set extensions
matches_extension() {
local filename=$(basename "$1")
local extension=".${filename##*.}"
local ext
for ext in $FILE_EXTS; do [[ "$ext" == "$extension" ]] && return 0; done
return 1
}
# necessary check for initial commit
if git rev-parse --verify HEAD >/dev/null 2>&1 ; then
against=HEAD
else
# Initial commit: diff against an empty tree object
against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi
# To get consistent formatting, we recommend contributors to use the same
# clang-format version as CI.
RECOMMENDED_CLANG_FORMAT_MAJOR_MIN="12"
RECOMMENDED_CLANG_FORMAT_MAJOR_MAX="13"
if [ ! -x "$CLANG_FORMAT" ] ; then
message="Error: clang-format executable not found. Please install clang-format $RECOMMENDED_CLANG_FORMAT_MAJOR_MAX."
if [ ! -t 1 ] ; then
if [ -x "$ZENITY" ] ; then
$ZENITY --error --title="Error" --text="$message"
exit 1
elif [ -x "$XMSG" ] ; then
$XMSG -center -title "Error" "$message"
exit 1
elif [ \( \( "$OSTYPE" = "msys" \) -o \( "$OSTYPE" = "win32" \) \) -a \( -x "$PWSH" \) ]; then
winmessage="$(canonicalize_filename "./.git/hooks/winmessage.ps1")"
$PWSH -noprofile -executionpolicy bypass -file "$winmessage" -center -title "Error" --text "$message"
exit 1
fi
fi
printf "$message\n"
printf "Set the correct path in $(canonicalize_filename "$0").\n"
exit 1
fi
# The returned string can be inconsistent depending on where clang-format comes from.
# Example output strings reported by `clang-format --version`:
# - Ubuntu: "Ubuntu clang-format version 11.0.0-2"
# - Fedora: "clang-format version 11.0.0 (Fedora 11.0.0-2.fc33)"
CLANG_FORMAT_VERSION="$(clang-format --version | sed "s/[^0-9\.]*\([0-9\.]*\).*/\1/")"
CLANG_FORMAT_MAJOR="$(echo "$CLANG_FORMAT_VERSION" | cut -d. -f1)"
if [[ "$CLANG_FORMAT_MAJOR" -lt "$RECOMMENDED_CLANG_FORMAT_MAJOR_MIN" || "$CLANG_FORMAT_MAJOR" -gt "$RECOMMENDED_CLANG_FORMAT_MAJOR_MAX" ]]; then
echo "Warning: Your clang-format binary is the wrong version ($CLANG_FORMAT_VERSION, expected between $RECOMMENDED_CLANG_FORMAT_MAJOR_MIN and $RECOMMENDED_CLANG_FORMAT_MAJOR_MAX)."
echo " Consider upgrading or downgrading clang-format as formatting may not be applied correctly."
fi
# create a random filename to store our generated patch
prefix="pre-commit-clang-format"
suffix="$(date +%s)"
patch="/tmp/$prefix-$suffix.patch"
# clean up any older clang-format patches
$DELETE_OLD_PATCHES && rm -f /tmp/$prefix*.patch
# create one patch containing all changes to the files
git diff-index --cached --diff-filter=ACMR --name-only $against -- | while read file;
do
# ignore thirdparty files
if grep -q "thirdparty" <<< $file; then
continue;
fi
if grep -q "platform/android/java/lib/src/com" <<< $file; then
continue;
fi
if grep -q "\-so_wrap." <<< $file; then
continue;
fi
# ignore file if we do check for file extensions and the file
# does not match any of the extensions specified in $FILE_EXTS
if $PARSE_EXTS && ! matches_extension "$file"; then
continue;
fi
# clang-format our sourcefile, create a patch with diff and append it to our $patch
# The sed call is necessary to transform the patch from
# --- $file timestamp
# +++ - timestamp
# to both lines working on the same file and having a/ and b/ prefix.
# Else it can not be applied with 'git apply'.
"$CLANG_FORMAT" -style=file "$file" --Wno-error=unknown | \
diff -u "$file" - | \
sed -e "1s|--- |--- a/|" -e "2s|+++ -|+++ b/$file|" >> "$patch"
done
# if no patch has been generated all is ok, clean up the file stub and exit
if [ ! -s "$patch" ] ; then
printf "Files in this commit comply with the clang-format rules.\n"
rm -f "$patch"
exit 0
fi
# a patch has been created, notify the user and exit
printf "\nThe following differences were found between the code to commit "
printf "and the clang-format rules:\n\n"
if [ -t 1 ] ; then
$READER "$patch"
printf "\n"
# Allows us to read user input below, assigns stdin to keyboard
exec < /dev/tty
terminal="1"
else
cat "$patch"
printf "\n"
# Allows non zero zenity/powershell output
set +e
terminal="0"
fi
while true; do
if [ $terminal = "0" ] ; then
if [ -x "$ZENITY" ] ; then
choice=$($ZENITY --text-info --filename="$patch" --width=800 --height=600 --title="Do you want to apply that patch?" --ok-label="Apply" --cancel-label="Do not apply" --extra-button="Apply and stage")
if [ "$?" = "0" ] ; then
yn="Y"
else
if [ "$choice" = "Apply and stage" ] ; then
yn="S"
else
yn="N"
fi
fi
elif [ -x "$XMSG" ] ; then
$XMSG -file "$patch" -buttons "Apply":100,"Apply and stage":200,"Do not apply":0 -center -default "Do not apply" -geometry 800x600 -title "Do you want to apply that patch?"
choice=$?
if [ "$choice" = "100" ] ; then
yn="Y"
elif [ "$choice" = "200" ] ; then
yn="S"
else
yn="N"
fi
elif [ \( \( "$OSTYPE" = "msys" \) -o \( "$OSTYPE" = "win32" \) \) -a \( -x "$PWSH" \) ]; then
winmessage="$(canonicalize_filename "./.git/hooks/winmessage.ps1")"
$PWSH -noprofile -executionpolicy bypass -file "$winmessage" -file "$patch" -buttons "Apply":100,"Apply and stage":200,"Do not apply":0 -center -default "Do not apply" -geometry 800x600 -title "Do you want to apply that patch?"
choice=$?
if [ "$choice" = "100" ] ; then
yn="Y"
elif [ "$choice" = "200" ] ; then
yn="S"
else
yn="N"
fi
else
printf "Error: zenity, xmessage, or powershell executable not found.\n"
exit 1
fi
else
read -p "Do you want to apply that patch (Y - Apply, N - Do not apply, S - Apply and stage files)? [Y/N/S] " yn
fi
case $yn in
[Yy] ) git apply $patch;
printf "The patch was applied. You can now stage the changes and commit again.\n\n";
break
;;
[Nn] ) printf "\nYou can apply these changes with:\n git apply $patch\n";
printf "(may need to be called from the root directory of your repository)\n";
printf "Aborting commit. Apply changes and commit again or skip checking with";
printf " --no-verify (not recommended).\n\n";
break
;;
[Ss] ) git apply $patch;
git diff-index --cached --diff-filter=ACMR --name-only $against -- | while read file;
do git add $file;
done
printf "The patch was applied and the changed files staged. You can now commit.\n\n";
break
;;
* ) echo "Please answer yes or no."
;;
esac
done
exit 1 # we don't commit in any case
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