git amend command

git-amend.sh

#!/usr/bin/env bash
git status >/dev/null
if [ $? -ne 0 ]; then
  echo "Nothing to commit. Use git add first"
  exit 1
fi

TARGET=$1
BRANCH=$(git name-rev HEAD | cut -d' ' -f2)

if [ -z $TARGET ]; then
  echo "Aborted: you must specify the target commit"
  exit 1
fi

# go back in history
git checkout -q $TARGET

if [ $? -ne 0 ]; then
  echo "Aborted: your changes didn't apply cleanly"
  exit 1
fi

# amend the commit. this opens your editor
git commit -v --amend

# check if working copy is still dirty
git status -a >/dev/null
dirty=$?
# stash changes if so
[ $dirty -eq 0 ] && git stash save -q

# apply the remaining commits on this branch
git rebase --onto HEAD $TARGET $BRANCH && [ $dirty -eq 0 ] && git stash pop -q