Version control prompt

scm_prompt.sh

#!/bin/bash
# Copyright © 2012 Martin Ueding <dev@martin-ueding.de>

# This script has been placed in the public domain via the CC0 license:
# https://creativecommons.org/publicdomain/zero/1.0/

# Checks the current working directory for a git, bzr (or svn or hg, …) tree
# and displays the apropriate name. If the status is supposed to be displayed,
# a ``bzr status`` is run. Git features the ``__git_ps1``, which is used instead in
# case a git repo is found.
scmprompt() {
	local showstatus=false

	# enable color
	#shopt -s xpg_echo

	local cdir=$(pwd)

	while [[ "$cdir" != "/" ]]
	do
		if [[ "$cdir" = "/home/mu" ]]
		then
			exit 0
		fi

		# git
		if [[ "$(basename "$cdir")" = ".git" ]]
		then
			exit 0
		fi

		if [[ -d "$cdir/.git" ]]
		then
			if type -t __git_ps1 > /dev/null
			then
				echo "$(__git_ps1)"
			else
				echo " git"
			fi
			exit 0
		fi

		# bzr
		if [[ -d "$cdir/.bzr" ]]
		then
			if [[ -d "$cdir/.bzr/branch" ]]
			then
				if [[ $showstatus = 'false' ]]
				then
					echo " bzr"
				else
					if [[ "$(bzr status 2>&1 | wc -l)" -le 1 ]]
					then
						echo " bzr✓"
					else
						echo " bzr"
					fi
				fi
			else
				echo " bzr repo"
			fi
			exit 0
		fi

		# svn
		if [[ -d "$cdir/.svn" ]]
		then
			echo " svn"
			exit 0
		fi

		# mercurial
		if [[ -d "$cdir/.hg" ]]
		then
			echo " hg"
			exit 0
		fi

		# Go up one dir in the directory tree.
		cdir=${cdir%/*}
		if [[ -z "$cdir" ]]
		then
			cdir="/"
		fi
	done
}