142 lines
4.7 KiB
Bash
142 lines
4.7 KiB
Bash
#!/bin/bash
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# git pre-commit hook that runs an clang-format stylecheck.
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# Features:
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# - abort commit when commit does not comply with the style guidelines
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# - create a patch of the proposed style changes
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# modifications for clang-format by rene.milk@wwu.de
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# This file is part of a set of unofficial pre-commit hooks available
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# at github.
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# Link: https://github.com/githubbrowser/Pre-commit-hooks
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# Contact: David Martin, david.martin.mailbox@googlemail.com
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##################################################################
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# SETTINGS
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# set path to clang-format binary
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CLANG_FORMAT="/Users/wyi/usr/bin/clang-format"
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# remove any older patches from previous commits. Set to true or false.
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# DELETE_OLD_PATCHES=false
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DELETE_OLD_PATCHES=false
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# only parse files with the extensions in FILE_EXTS. Set to true or false.
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# if false every changed file in the commit will be parsed with clang-format.
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# if true only files matching one of the extensions are parsed with clang-format.
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# PARSE_EXTS=true
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PARSE_EXTS=true
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# file types to parse. Only effective when PARSE_EXTS is true.
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# FILE_EXTS=".c .h .cpp .hpp"
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FILE_EXTS=".c .h .cpp .hpp .cc .hh .cxx .m"
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##################################################################
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# There should be no need to change anything below this line.
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# Reference: http://stackoverflow.com/questions/1055671/how-can-i-get-the-behavior-of-gnus-readlink-f-on-a-mac
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canonicalize_filename () {
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local target_file=$1
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local physical_directory=""
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local result=""
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# Need to restore the working directory after work.
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pushd `pwd` > /dev/null
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cd "$(dirname "$target_file")"
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target_file=`basename $target_file`
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# Iterate down a (possible) chain of symlinks
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while [ -L "$target_file" ]
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do
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target_file=$(readlink "$target_file")
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cd "$(dirname "$target_file")"
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target_file=$(basename "$target_file")
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done
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# Compute the canonicalized name by finding the physical path
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# for the directory we're in and appending the target file.
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physical_directory=`pwd -P`
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result="$physical_directory"/"$target_file"
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# restore the working directory after work.
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popd > /dev/null
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echo "$result"
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}
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# exit on error
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set -e
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# check whether the given file matches any of the set extensions
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matches_extension() {
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local filename=$(basename "$1")
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local extension=".${filename##*.}"
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local ext
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for ext in $FILE_EXTS; do [[ "$ext" == "$extension" ]] && return 0; done
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return 1
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}
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# necessary check for initial commit
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if git rev-parse --verify HEAD >/dev/null 2>&1 ; then
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against=HEAD
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else
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# Initial commit: diff against an empty tree object
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against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
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fi
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if [ ! -x "$CLANG_FORMAT" ] ; then
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printf "Error: clang-format executable not found.\n"
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printf "Set the correct path in $(canonicalize_filename "$0").\n"
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exit 1
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fi
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# create a random filename to store our generated patch
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prefix="pre-commit-clang-format"
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suffix="$(date +%s)"
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patch="/tmp/$prefix-$suffix.patch"
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# clean up any older clang-format patches
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$DELETE_OLD_PATCHES && rm -f /tmp/$prefix*.patch
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# create one patch containing all changes to the files
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git diff-index --cached --diff-filter=ACMR --name-only $against -- | while read file;
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do
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# ignore file if we do check for file extensions and the file
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# does not match any of the extensions specified in $FILE_EXTS
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if $PARSE_EXTS && ! matches_extension "$file"; then
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continue;
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fi
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# clang-format our sourcefile, create a patch with diff and append it to our $patch
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# The sed call is necessary to transform the patch from
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# --- $file timestamp
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# +++ - timestamp
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# to both lines working on the same file and having a a/ and b/ prefix.
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# Else it can not be applied with 'git apply'.
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"$CLANG_FORMAT" -style=file "$file" | \
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diff -u "$file" - | \
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sed -e "1s|--- |--- a/|" -e "2s|+++ -|+++ b/$file|" >> "$patch"
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done
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# if no patch has been generated all is ok, clean up the file stub and exit
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if [ ! -s "$patch" ] ; then
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printf "Files in this commit comply with the clang-format rules.\n"
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rm -f "$patch"
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exit 0
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fi
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# a patch has been created, notify the user and exit
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printf "\nThe following differences were found between the code to commit "
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printf "and the clang-format rules:\n\n"
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cat "$patch"
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printf "\nYou can apply these changes with:\n git apply $patch\n"
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printf "(may need to be called from the root directory of your repository)\n"
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printf "Aborting commit. Apply changes and commit again or skip checking with"
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printf " --no-verify (not recommended).\n"
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exit 1
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