Script that converts indentation format

fix-indentation.sh

#!/bin/sh

set -e

# Convert indentation from $INDENT_CURRENT to $INDENT_TARGET
INDENT_CURRENT="	" # 1 Tab
INDENT_TARGET="    " # 4 Spaces
EXTENSION="*.php"

is_dirty() {
        echo "`git diff --shortstat --ignore-submodules=dirty 2> /dev/null | tail -n1`"
}

if [ ! -z "`is_dirty`" ]; then
        echo "Your repository is dirty, only do this on a clean repository"
        exit 1
fi

BRANCH=$1
CURRENT="`git show --format='%H' | head -n1`"

if [ -z "$BRANCH" ]; then
        BRANCH="indentfix-`date | md5`"
fi

git checkout -b $BRANCH

find . -type f -name "$EXTENSION" \( -not -path .git \) -exec sed -i '' -E "s/^(($INDENT_TARGET)*)($INDENT_CURRENT)/\1$INDENT_TARGET/g" {} \;

while [ "`is_dirty`" != "" ]; do
        # Add all the files that already were in version control to a commit
        git add -u
        git commit -q -m "An automated round of indentation fixing."

        # Find all files violating tab rules.
        find . -type f -name "$EXTENSION" \( -not -path .git \) -exec sed -i '' -E "s/^(($INDENT_TARGET)*)($INDENT_CURRENT)/\1$INDENT_TARGET/g" {} \;
        is_dirty
done

git rebase -i "$CURRENT"

echo "done"