git-garbage-collect

#!/bin/bash
set -euo pipefail
function show_usage() {
cat <<USAGE
Usage:  git-garbage-collect  [ -hi ]

    Cleans and garbage collects your local git repo.

Options:

    -h  Show this help and exit.
    -i  Interactive mode. Ask before removing orphan files.

Discusion:

After regular use your local git repo gets full of dangling references, old tags, and orphan files,
all of which can take up extra space and slow down git operations.

This script cleans these up. Run it occasionally, especially after a large change has been made
to the repo, such as a Carthage SDK update.

USAGE
}

interactive_mode=false
while getopts ":hi" option
do
    case "$option" in
    h)  show_usage
        exit 0
        ;;
    i)  interactive_mode=true
        ;;
    *)  echo ">>> Error: Unknown option '$OPTARG'." 1>&2
        exit 1
        ;;
    esac
done

if ! top_level="$(git rev-parse --show-toplevel)"
then
    echo ">>> Error: This script must be run from in your local git directory." 1>&2
    exit 1
fi
cd "$top_level"

# Make sure the current git repo is clean:
if [ -n "$(git status --porcelain)" ]
then
    echo ">>> Error: Please commit your changes before continuing." 1>&2
    exit 1
fi

# Remove old tags:
git fetch --prune origin '+refs/tags/*:refs/tags/*'

# Remove old local branches:
git branch --merged=master | grep -v master | xargs git branch -d || true

# Remove old remote branches:
git fetch --prune

# Remove orphaned files and directories:
if $interactive_mode
then
    clean_count=$(git clean -dxn | wc -l)
    if (( $clean_count > 0 ))
    then
        git clean -dxn
        if ./tools/scripts/askYN "Remove these files?"
        then
            git clean -dxf
        fi
    fi
else
    git clean -dxf
fi

# Do this twice to get rid of any dangling refs after the first time:
git gc
git prune
git gc
git prune