2 # Copyright (c) 2015, David Martin
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions are met:
8 # * Redistributions of source code must retain the above copyright notice, this
9 # list of conditions and the following disclaimer.
11 # * Redistributions in binary form must reproduce the above copyright notice,
12 # this list of conditions and the following disclaimer in the documentation
13 # and/or other materials provided with the distribution.
15 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 # git pre-commit hook that runs an clang-format stylecheck.
27 # - abort commit when commit does not comply with the style guidelines
28 # - create a patch of the proposed style changes
30 # modifications for clang-format by rene.milk@wwu.de
31 # This file is part of a set of unofficial pre-commit hooks available
33 # Link: https://github.com/githubbrowser/Pre-commit-hooks
34 # Contact: David Martin, david.martin.mailbox@googlemail.com
37 ##################################################################
39 # set path to clang-format binary
40 CLANG_FORMAT=$(which clang-format)
42 # remove any older patches from previous commits. Set to true or false.
43 DELETE_OLD_PATCHES=false
45 # only parse files with the extensions in FILE_EXTS. Set to true or false.
46 # if false every changed file in the commit will be parsed with clang-format.
47 # if true only files matching one of the extensions are parsed with clang-format.
50 # file types to parse. Only effective when PARSE_EXTS is true.
51 # FILE_EXTS=".c .h .cpp .hpp"
52 FILE_EXTS=".c .h .cpp .hpp .cc .hh .cxx"
54 ##################################################################
55 # There should be no need to change anything below this line.
57 # Reference: http://stackoverflow.com/questions/1055671/how-can-i-get-the-behavior-of-gnus-readlink-f-on-a-mac
58 canonicalize_filename () {
60 local physical_directory=""
63 # Need to restore the working directory after work.
64 pushd `pwd` > /dev/null
66 cd "$(dirname "$target_file")"
67 target_file=`basename $target_file`
69 # Iterate down a (possible) chain of symlinks
70 while [ -L "$target_file" ]
72 target_file=$(readlink "$target_file")
73 cd "$(dirname "$target_file")"
74 target_file=$(basename "$target_file")
77 # Compute the canonicalized name by finding the physical path
78 # for the directory we're in and appending the target file.
79 physical_directory=`pwd -P`
80 result="$physical_directory"/"$target_file"
82 # restore the working directory after work.
91 # check whether the given file matches any of the set extensions
93 local filename=$(basename "$1")
94 local extension=".${filename##*.}"
97 for ext in $FILE_EXTS; do [[ "$ext" == "$extension" ]] && return 0; done
102 # necessary check for initial commit
103 if git rev-parse --verify HEAD >/dev/null 2>&1 ; then
106 # Initial commit: diff against an empty tree object
107 against=foobaridonotexist
110 if [ ! -x "$CLANG_FORMAT" ] ; then
111 printf "Error: clang-format executable not found.\n"
112 printf "Set the correct path in $(canonicalize_filename "$0").\n"
116 # create a random filename to store our generated patch
117 prefix="pre-commit-clang-format"
119 patch="/tmp/$prefix-$suffix.patch"
121 # clean up any older clang-format patches
122 $DELETE_OLD_PATCHES && rm -f /tmp/$prefix*.patch
124 # create one patch containing all changes to the files
125 git diff-index --cached --diff-filter=ACMR --name-only $against -- | while read file;
127 # ignore file if we do check for file extensions and the file
128 # does not match any of the extensions specified in $FILE_EXTS
129 if $PARSE_EXTS && ! matches_extension "$file"; then
133 # clang-format our sourcefile, create a patch with diff and append it to our $patch
134 # The sed call is necessary to transform the patch from
135 # --- $file timestamp
137 # to both lines working on the same file and having a a/ and b/ prefix.
138 # Else it can not be applied with 'git apply'.
139 git clang-format --diff -q >> "$patch"
140 #"$CLANG_FORMAT" -style=file "$file" | \
141 #diff -u "$file" - | \
142 #sed -e "1s|--- |--- a/|" -e "2s|+++ -|+++ b/$file|" >> "$patch"
145 # if no patch has been generated all is ok, clean up the file stub and exit
146 if [ ! -s "$patch" ] ; then
147 printf "Files in this commit comply with the clang-format rules.\n"
152 # a patch has been created, notify the user and exit
153 printf "\nThe following differences were found between the code to commit "
154 printf "and the clang-format rules:\n\n"
157 printf "\nYou can apply these changes with:\n git apply $patch\n"
158 printf "(may need to be called from the root directory of your repository)\n"
159 printf "\nNote: git apply only modifies your working directory, but not your index, i.e., not what you want to commit.\n"
160 printf "You need to run 'git add' again after you applied this patch OR just run git apply a second time:"
161 printf "\n git apply --cached $patch\n\n"
162 printf "Aborting commit. Apply changes and commit again or skip checking with"
163 printf " --no-verify (not recommended).\n"