version control info in your bash shell prompt

gistfile1.sh

# based on http://pastie.org/230805
# and http://gist.github.com/3829/
# from http://www.simplisticcomplexity.com/2008/03/13/show-your-git-branch-name-in-your-prompt/

_bold=$(tput bold)
_normal=$(tput sgr0)

__vcs_dir() {
 local vcs base_dir sub_dir ref

 sub_dir() {
   local sub_dir
   sub_dir=$(stat -f "${PWD}")
   sub_dir=${sub_dir#$1}
   echo ${sub_dir#/}
 }

 git_dir() {
   base_dir=$(git rev-parse --show-cdup 2>/dev/null) || return 1
   if [ -n "$base_dir" ]; then
     base_dir=`cd $base_dir; pwd`
   else
     base_dir=$PWD
   fi
   sub_dir=$(git rev-parse --show-prefix)
   sub_dir="/${sub_dir%/}"
   ref=$(git symbolic-ref -q HEAD || git-name-rev --name-only HEAD 2>/dev/null)
   ref=${ref#refs/heads/}
   # ref=${ref}/$(git describe --tags)
   vcs="git"
   base_dir="$(basename "${base_dir}")"
   alias pull="git pull"
   alias commit="git commit -a"
   alias push="commit && git push"
   alias revert="git checkout"
 }

 svn_dir() {
   [ -d ".svn" ] || return 1
   base_dir="."
   while [ -d "$base_dir/../.svn" ]; do base_dir="$base_dir/.."; done
   base_dir=`cd $base_dir; pwd`
   sub_dir="/$(sub_dir "${base_dir}")"
   ref=$(svn info "$base_dir" | awk '/^URL/ { sub(".*/","",$0); r=$0 } /^Revision/ { sub("[^0-9]*","",$0); print r":"$0 }')
   vcs="svn"
   base_dir="$(basename "${base_dir}")"
   alias pull="svn up"
   alias commit="svn commit"
   alias push="svn ci"
   alias revert="svn revert"
 }

 cvs_dir() {
   [ -d "CVS" ] || return 1
   base_dir="."
   while [ -d "$base_dir/../CVS" ]; do base_dir="$base_dir/.."; done
   base_dir=`cd $base_dir; pwd`
   sub_dir="/$(sub_dir "${base_dir}")"
   if [ -e "CVS/Tag" ]; then
     ref="$(cut -c 2- CVS/Tag)"
   else
     ref="trunk"
   fi
   vcs="cvs"
   base_dir="$(basename "${base_dir}")"
   alias pull="cvs update"
   alias commit="cvs commit"
   alias push="cvs commit"
   alias revert=""
 }

 cvs_dir || svn_dir || git_dir

 if [ -n "$vcs" ]; then
   __vcs_prefix="$vcs:"
   __vcs_base_dir="${base_dir/$HOME/~}"
   __vcs_ref="[$ref]"
   __vcs_sub_dir="${sub_dir}"
   alias st="$vcs status"
   alias d="$vcs diff"
   alias up="pull"
 else
   unalias st 2> /dev/null
   unalias d 2> /dev/null
   unalias up 2> /dev/null
   unalias pull 2> /dev/null
   unalias commit 2> /dev/null
   unalias push 2> /dev/null
   unalias revert 2> /dev/null

   __vcs_prefix=''
   # __vcs_base_dir_temp=`basename "$PWD"`
   # if [ "$PWD" == "$HOME" ]; then
   #   __vcs_base_dir="~"
   # else
   #   __vcs_base_dir="`basename "$PWD"`"
   # fi
   __vcs_base_dir=${PWD/$HOME/"~"}
   __vcs_ref=''
   __vcs_sub_dir=''
 fi

 # from http://wiki.archlinux.org/index.php/Color_Bash_Prompt
 local NONE="\[\033[0m\]"    # unsets color to term's fg color

 # regular colors
 local K="\[\033[0;30m\]"    # black
 local R="\[\033[0;31m\]"    # red
 local G="\[\033[0;32m\]"    # green
 local Y="\[\033[0;33m\]"    # yellow
 local B="\[\033[0;34m\]"    # blue
 local M="\[\033[0;35m\]"    # magenta
 local C="\[\033[0;36m\]"    # cyan
 local W="\[\033[0;37m\]"    # white

 # emphasized (bolded) colors
 local EMK="\[\033[1;30m\]"
 local EMR="\[\033[1;31m\]"
 local EMG="\[\033[1;32m\]"
 local EMY="\[\033[1;33m\]"
 local EMB="\[\033[1;34m\]"
 local EMM="\[\033[1;35m\]"
 local EMC="\[\033[1;36m\]"
 local EMW="\[\033[1;37m\]"

 # background colors
 local BGK="\[\033[40m\]"
 local BGR="\[\033[41m\]"
 local BGG="\[\033[42m\]"
 local BGY="\[\033[43m\]"
 local BGB="\[\033[44m\]"
 local BGM="\[\033[45m\]"
 local BGC="\[\033[46m\]"
 local BGW="\[\033[47m\]"

 export PS1="${EMG}\u@host ${C}${__vcs_prefix}${EMC}${__vcs_base_dir}${C}${__vcs_ref}${EMC}${__vcs_sub_dir} \$${NONE} "
}

PROMPT_COMMAND=__vcs_dir