version control info in your bash shell prompt

gistfile1.sh

# based on http://pastie.org/230805
#   http://gist.github.com/3829/
#   http://pastie.org/1868906
# 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

  git_dir() {
    local t
    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=$(git rev-parse --show-prefix)
    [ -n "${sub_dir}" ] && sub_dir="/${sub_dir%/}"
    ref=$(git symbolic-ref -q HEAD || git name-rev --name-only HEAD 2>/dev/null)
    ref=${ref#refs/heads/}
    t=$(git describe --tags 2>/dev/null)
    [ ${?} -eq 0 ] && ref=${ref}:${t%-*}
    vcs="git"
    alias pull="git pull"
    alias f="git fetch"
    alias commit="git commit -a"
    alias push="commit && git push"
    alias revert="git checkout"
    alias gl="git log --oneline --decorate --graph"
    alias ds="git diff --staged"
  }

  svn_dir() {
    [ -d ".svn" ] || return 1
    base_dir="."
    while [ -d "${base_dir}"/../.svn ]; do
      base_dir="${base_dir}/.."
    done
    base_dir=`cd $base_dir; pwd`
    sub_dir="${PWD#${base_dir}}"
    ref=$(svn info "${base_dir}" \
      | awk '/^URL/ { sub(".*/","",$0); r=$0 } /^Revision/ { sub("[^0-9]*","",$0); print r":"$0 }')
    vcs="svn"
    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 $base_dir; pwd`
    sub_dir="${PWD#${base_dir}}"
    if [ -e "CVS/Tag" ]; then
      ref="$(cut -c 2- CVS/Tag)"
    else
      ref="trunk"
    fi
    vcs="cvs"
    alias pull="cvs update"
    alias commit="cvs commit"
    alias push="cvs commit"
  }

  cvs_dir || svn_dir || git_dir

  # 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="\[\033[47m\]"

  if [ -n "$vcs" ]; then
    __vcs_prefix="$vcs:"
    __vcs_base_dir="${EMC}${base_dir/$HOME/~}"
    __vcs_ref="[$ref]"
    __vcs_sub_dir="${sub_dir}"

    alias st="$vcs status"
    alias d="$vcs diff"
    alias up="pull"
  else
    __vcs_prefix=''
    __vcs_base_dir="${EMB}${PWD/$HOME/~}"
    __vcs_ref=''
    __vcs_sub_dir=''

    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
    unalias f 2> /dev/null
    unalias gl 2> /dev/null
    unalias ds 2> /dev/null
  fi

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

export PROMPT_COMMAND=__vcs_dir