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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`
# 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)
# READER="pygmentize -l diff"
READER=cat
##################################################################
# 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" == "$extension" ]] && return 0; done
return 1
}
# necessary check for initial commit
if git rev-parse --verify HEAD >/dev/null 2>&1 ; then
against=HEAD
else
# Initial commit: diff against an empty tree object
against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi
if [ ! -x "$CLANG_FORMAT" ] ; then
printf "Error: clang-format executable not found.\n"
printf "Set the correct path in $(canonicalize_filename "$0").\n"
exit 1
fi
# create a random filename to store our generated patch
prefix="pre-commit-clang-format"
suffix="$(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
# 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 "$file" | \
diff -u "$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"
$READER "$patch"
printf "\n"
# Allows us to read user input below, assigns stdin to keyboard
exec < /dev/tty
while true; do
read -p "Do you want to apply that patch (Y - Apply, N - Do not apply, S - Apply and stage files)? [Y/N/S] " yn
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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