git-fix-whitespace

#!/bin/bash
usage(){
cat << EOF
git-fix-whitespace - Fixes the whitespace issues that 'git-diff --check' complains about.
Usage:
    $0 --all
Synopsis:
    Fix all whitespace errors on modified lines in both staged and working files
EOF
}

apply_fail(){
    echo "Failed to apply patch $PATCH"
    echo "ERROR = $1"
    exit $1
}

if [[ $# != 1 || "$1" != "--all" ]]; then
    usage
    exit
fi

EXCLUDE=--exclude=*.beam

if git diff --check HEAD > /dev/null; then
    echo "No whitespace errors in work dir"
else
    PATCH_w=$(mktemp ${0##*/}.patch.XXXXXX)
    git diff --no-ext-diff HEAD > $PATCH_w
    git apply -R $EXCLUDE $PATCH_w || apply_fail 1
    git apply --whitespace=fix $EXCLUDE $PATCH_w || apply_fail 2
fi

if git diff --check --cached HEAD > /dev/null; then
    echo "No whitespace errors in staged files"
else
    PATCH_c=$(mktemp ${0##*/}.patch.XXXXXX)
    git diff --no-ext-diff --cached HEAD > $PATCH_c
    git apply --cached -R $EXCLUDE $PATCH_c || apply_fail 3
    git apply --cached --whitespace=fix $EXCLUDE $PATCH_c || apply_fail 4
fi

rm $PATCH_c $PATCH_w