#!/usr/bin/env bash

options=""

usage() {

cat <<HERE

usage: git alias [options] # list all aliases

or: git alias [options] <search-pattern> # show aliases matching pattern

or: git alias [options] <alias-name> <command> # alias a command

options:

--global Show or create alias in the system config

--local Show or create alias in the repository config

HERE

}

if [[ "$1" == "--local" || "$1" == "--global" ]]; then

options=$1

shift

fi

case $# in

0)

if [[ -z "$options" ]]; then

git config --get-regexp 'alias.*' | sed 's/^alias\.//' | sed 's/[ ]/ = /' | sort

else

git config "$options" --get-regexp 'alias.*' | sed 's/^alias\.//' | sed 's/[ ]/ = /' | sort

fi

;;

1)

if [[ -z "$options" ]]; then

git config --get-regexp 'alias.*' | sed 's/^alias\.//' | sed 's/[ ]/ = /' | sort | grep -e "$1"

else

git config "$options" --get-regexp 'alias.*' | sed 's/^alias\.//' | sed 's/[ ]/ = /' | sort | grep -e "$1"

fi

;;

2)

if [[ -z "$options" ]]; then

git config alias."$1" "$2"

else

git config "$options" alias."$1" "$2"

fi

;;

*) >&2 echo "error: too many arguments." && usage && exit 1 ;;

esac