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#!/bin/sh
#
# This pre-commit hook checks if any versions of clang-format
# are installed, and if so, uses the installed version to format
# the staged changes.
maj_min=1
maj_max=3
base=clang-format
format=""
# Redirect output to stderr.
exec 1>&2
# check if clang-format is installed
type "$base" >/dev/null 2>&1 && format="$base"
# if not, check all possible versions
# (i.e. clang-format-<$maj_min-$maj_max>-<0-9>)
if [ -z "$format" ]
then
for j in `seq $maj_max -1 $maj_min`
do
for i in `seq 0 9`
do
type "$base-$j.$i" >/dev/null 2>&1 && format="$base-$j.$i" && break
done
[ -z "$format" ] || break
done
fi
# no versions of clang-format are installed
if [ -z "$format" ]
then
echo "$base is not installed. Pre-commit hook will not be executed."
exit 0
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
# do the formatting
for file in `git diff-index --cached --name-only $against`
do
"$format" -i "$file"
done
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