pre-commit

#!/bin/sh
# 
# Pre-commit hook script for Unity to check that every folder that just has marked to be ignored in .gitignore 
# has an entry for its meta file to be ignored too.
# 
# Put this file into directory .git/hooks. To disable it remove it from there.


# check if staged files contain .gitignore
if [ ! `git diff --name-only --cached | grep "\.gitignore"` ]; then
	# avoid expensive diff actions if there is no change in .gitignore
	exit 0
fi

# new lines have the format {+xxxxx+}
raw_diff_output=`git diff --cached --word-diff=plain .gitignore | egrep  "\{\+.*\+\}"`

# prepare two strings: on for directories and one for meta files
for raw_entry in $raw_diff_output; do
	# strip leading and trailing separator "{+" and "+}"
	e=${raw_entry:2:$((${#raw_entry}-4))}
	is_meta=$((`echo $e | egrep ".*meta" | wc -l`))
	if [ $is_meta -eq 0 ]; then
		diff_output_dirs="${diff_output_dirs} ${e}"
	else
		diff_output_metas="${diff_output_metas} ${e}"
	fi
done

# iterate over directories and check if there is an entry for the appropriate meta file
for i in $diff_output_dirs; do 
	# meta file entries are often without directory, so strip the path
	dir_name=`echo $i | egrep -o "/[^/]+$" | cut -d / -f 2`
	has_meta_ignore=$((`echo $diff_output_metas | grep "$dir_name.meta" | wc -l`))
	if [ ${has_meta_ignore} -eq 0 ]; then
		echo "$dir_name found in .gitignore but not the corresponding meta file! Please add ${dir_name}.meta to .gitignore"
		exit 1
	fi
done