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a pre-commit hook for git to remove trailing whitespace

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pre-commit
Shell
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#!/bin/sh
#
# A git hook script to find and fix trailing whitespace
# in your commits. Bypass it with the --no-verify option
# to git-commit
# Ref - http://is.gd/PerowD
#
 
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
 
# Find files with trailing whitespace
for FILE in `exec git diff-index --check $against -- | sed '/^[+-]/d' | (sed -r 's/:[0-9]+:.*//' > /dev/null 2>&1 || sed -E 's/:[0-9]+:.*//') | uniq` ; do
# Fix them!
(sed -i 's/[[:space:]]*$//' "$FILE" > /dev/null 2>&1 || sed -i '' -E 's/[[:space:]]*$//' "$FILE")
git add "$FILE"
echo "NOTE: removed trailing whitespace from $FILE"
done
 
exit

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