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|
#!/bin/bash
set -eEu
# Path to clang-format. If it's in your PATH, "clang-format" is fine.
# If you do not have it (or the version is too old), see USE_DOCKER.
CLANG_FORMAT="/usr/local/bin/clang-format"
# Set to "yes" if you want to create and use a docker container
# for clang-format.
USE_DOCKER="no"
# Set this to "yes" if you typically commit from the command line
# and wish to be prompted on whether to apply any patches
# automatically.
INTERACTIVE="yes"
# Leave this stuff
STASH_NAME="pre-commit-$(date +%s)"
CONTAINER_NAME="clang-format-$(date +%s)"
CLANG_FORMAT_VERSION="11.0.0"
apply_patch() {
local patchfile=$1
git apply --index "$patchfile"
rm -f "$patchfile"
exit 0
}
stash() {
git stash save -q --keep-index "$STASH_NAME"
}
unstash() {
if git stash list | head -n 1 | grep -Fq "$STASH_NAME"; then
git stash pop -q || true
fi
}
cleanup() {
ec=$?
unstash
if [ $USE_DOCKER == "yes" ]; then
docker kill "$CONTAINER_NAME" >/dev/null 2>&1 || true
fi
if [ $ec -ne 0 ]; then
echo Aborted.
fi
exit $ec
}
if [ $USE_DOCKER == "yes" ]; then
if [ ! "$(docker images clang-format --format '{{.Repository}}')" ]; then
echo "Creating docker image for clang-format (one time only)..."
docker run --name=clang-format alpine:latest apk --no-cache add clang >/dev/null 2>&1
docker commit clang-format clang-format >/dev/null 2>&1
docker rm clang-format
fi
CLANG_FORMAT="docker exec $CONTAINER_NAME clang-format"
docker run --rm --name "$CONTAINER_NAME" -t -d -v "$(git rev-parse --show-toplevel)":/src -w /src clang-format tail -f /dev/null >/dev/null 2>&1
# alternatively (slower for multiple files)
#CLANG_FORMAT="docker run --rm -v $(git rev-parse --show-toplevel):/src -w /src clang-format clang-format"
fi
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
exec 1>&2
$CLANG_FORMAT -version | grep -Fq "$CLANG_FORMAT_VERSION" || (echo Incorrect version of clang-format.; exit 1)
patchfile=$(mktemp -t git-clang-format.XXXXXX.patch)
stash
trap "cleanup" SIGHUP SIGINT SIGTERM EXIT ERR
git diff-index --cached --diff-filter=ACMR --name-only $against -- | grep "\.[ch]$" | while read -r file;
do
$CLANG_FORMAT -style=file "$file" | \
diff -u "$file" - | \
sed -e "1s|--- |--- a/|" -e "2s|+++ -|+++ b/$file|" >> "$patchfile"
# cat is just here to ignore the exit status of diff
$CLANG_FORMAT -style=file "$file" | diff -u "$file" - | cat
done
unstash
if [ ! -s "$patchfile" ]; then
rm -f "$patchfile"
exit 0
fi
echo
echo Formatting changes requested.
echo "See $patchfile"
echo
if ! git apply --index --check "$patchfile"; then
echo You may have unstaged changes to files that require formatting updates.
echo It is not safe for this script to apply the patch automatically.
exit 1
fi
if [ $INTERACTIVE == "yes" ]; then
while true; do
exec < /dev/tty
read -rp "Apply now (y/n)? " yn
exec <&-
case $yn in
[Yy]* ) apply_patch "$patchfile"; exit 0;;
[Nn]* ) break;;
* ) echo Please answer yes or no. ;;
esac
done
fi
echo
echo You should manually apply the patch with:
echo "git apply --index \"$patchfile\""
echo "Or use another method, and then restage."
exit 1
|
