UGH - uncrustify git history

ugh

#!/bin/sh

#  ugh.sh
#  
#
#  Created by Andrew McKnight on 11/27/14.
#

# UGH: uncrustify git history. 
# Creates a new branch and cherry picks a range of commits, uncrustifying any modified .h/.m files.
# Requires an uncrustify config file path to be defined in UNCRUSTIFY_CONFIG.

# if no arguments provided, print usage
if [[ $# -lt 1 ]];
then

    echo "Usage: ugh <start hash> [<end hash>]"

else

    # if only the start hash is provided, uncrustify all commits from it up to HEAD
    endCommit="HEAD"

    # get the end commit hash if provided
    if [[ $# -gt 1 ]];
    then

        endCommit=$2

    fi

    # get list of all hashes in range (including the start hash)
    hashes=$(git log --pretty=format:"%H" $1..$endCommit --reverse)
    hashes=("$1" "${hashes[@]}")

    # branch off the parent of the first commit
    git checkout -b "`git rev-parse --abbrev-ref HEAD`-uncrustified" $1~1

    # for each commit hash in the range
    for hash in ${hashes[@]}; do

        # cherry pick changes in commit onto current working index
        git cherry-pick $hash --no-commit

        # get list of changed files in current working index
        files=$(git diff HEAD --name-only)

        # for each listed file
        for file in $files; do

            # check if extension is .h/.m
            extension="${file##*.}"
            if [[ "$extension" == 'h' || "$extension" == 'm' ]];
            then

                # uncrustify file
                uncrustify $file --no-backup

            fi

        done

        # apply commit with same commit message
        git commit -a -m "`git log --format=%B -n 1 $hash`"

    done

fi