git-cheap-squash

#!/bin/bash
set -e
destination='master'
branch=$(git rev-parse --abbrev-ref HEAD)
git checkout ${destination}
git pull
git checkout ${branch}
git checkout -b ${branch}-backup
git checkout ${destination}
git branch -D ${branch}
git checkout -b ${branch}
git merge --squash ${branch}-backup
_done="
Everything seems fine. Next steps:
    git status
    git commit # Or re-stage and do multiple commits
    git push --force-with-lease --set-upstream origin ${branch}
 
To undo:
    git reset HEAD .
    git checkout -- .
    git checkout ${destination}
    git branch -d ${branch}
    # If branch exists on GiHub:
    git branch -D ${branch}-backup
    git fetch
    git checkout ${branch}
    # Else:
    git branch -m ${branch}-backup ${branch}
"
echo "$_done"