Git hard-rename commit

git-hrc.sh

#!/bin/bash

# Git Hard Rename Commit (git-hrc)
# Copyright (C) rmnscnce@github
# Licensed under GNU General Public License v3
# This software comes with absolutely NO WARRANTY

# LICENSE RETRIEVAL (yes this is required, DO NOT REMOVE)
if [ ! -f $HOME/git-hrnc/COPYING ] ; then
	mkdir -p $HOME/git-hrc
	curl https://www.gnu.org/licenses/gpl-3.0.txt -o $HOME/git-hrnc/COPYING
fi

# MAKE SURE RUNNING ON A GIT REPO
if [ ! -d .git ] ; then
	echo -e "\n\nError: Not a Git repository\n\n"
	exit 1
fi

# ARG CHECK
if [ -z "$1" ] ; then
	echo -e "Error: Invalid argument $1. Valid arguments: <#numberofcommit|help> [nopush]"
	exit 64
fi

if [ ! -n "$1" ] && [ ! "$1" -eq "$1" ] 2>/dev/null ; then
	echo -e "Error: Invalid argument $1. Valid arguments: <#numberofcommit|help> [nopush]"
	exit 64
fi

if [ "$2" == "nopush" ] ; then
	EXNOPUSH="No"
else
	EXNOPUSH="Yes"
fi

# FUNCTIONS
helper () {
	echo -e "Git Hard Rename Commit (git-hrc)"
	echo -e "Licensed under GNU General Public License v3"
	echo -e "This software comes with absolutely NO WARRANTY"
	echo -e "\nUsage: ./git-hrnc.sh <#numberofcommit|help> [nopush]"
}

exiterr () {
	if [ ! "$?" -eq "0" ] ; then
		exit $?
	fi
}

# CUE HELP MESSAGE

if [ "$1" == "help" ] ; then
	helper
	exit 0
fi

BRANCHNAME=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')
HRNCBRANCH=${BRANCHNAME}-hrc

while true; do
	echo -e "\n\nCommits being hard-renamed into one: $1"
	echo -e "Automatically push to remote origin: $EXNOPUSH"
	echo -e "\nDo you really want to hard-rename the commits? (case-insensitive:y|n)"
	read hrcprompt
	if [ "$hrcprompt" != "${hrcprompt#[Nn]}" ] ; then
		echo -e "\n\nOperation aborted. Exiting..."
		exit $?
	elif [ "$hrcprompt" != "${hrcprompt#[Yy]}" ] ; then
		break
	else
		echo -e "\n\nInvalid response $hrcprompt. Please input your choice."
	fi
done

git branch -D ${HRNCBRANCH}
git checkout -b ${HRNCBRANCH} HEAD~$1 ; exiterr
git checkout ${BRANCHNAME} ; exiterr
git format-patch -$1 HEAD~$1 --stdout > ../hrc.patch ; exiterr
git checkout ${HRNCBRANCH} ; exiterr
patch -f -p1 < ../hrc.patch
find . -name "*.orig" -exec rm -rf {} +
find . -name "*.rej" -exec rm -rf {} +
git add *
git commit

if [ ! -z "$2" ] ; then
	if [ ! "$2" == "nopush" ] ; then
		git push --delete origin ${BRANCHNAME} ; exiterr
	else
		echo -e "\n\nError: Invalid argument $2. Valid arguments: <#numberofcommit|help> [nopush]"
		exit 64
	fi
fi

git branch -D ${BRANCHNAME} ; exiterr
git branch -m ${BRANCHNAME}

if [ ! -z "$2" ] ; then
	if [ ! "$2" == "nopush" ] ; then
		git push -u origin ${BRANCHNAME} ; exiterr
	else
		echo -e "\n\nError: Invalid argument $2. Valid arguments: <#numberofcommit|help> [nopush]"
		exit 64
	fi
fi

echo -e "\n\nDone."
exit $?