My standard shell prompt script. Show current git branch in the prompt, if there is one. Show current path in the prompt. Replace home path with "~". Replace "/var/www" with "%".

prompt.sh

parse_git_branch () {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'
}

parse_pwd () {
  pwd | sed -e 's#/var/www/#%#' | sed -e 's#/home/myusername#~#'
}

prompt () {
  echo "$BRANCH_COLOR\$(parse_git_branch)$USERNAME_COLOR`whoami`$PATH_COLOR\$(parse_pwd)$PROMPT_COLOR "
}

USERNAME_COLOR="\[\033[0;37m\]" #gray
BRANCH_COLOR="\[\033[0;33m\]" #yellow
PATH_COLOR="\[\033[1;32m\]" #green; bold
PROMPT_COLOR="\[\033[0m\]" #none (white)

PS1="$(prompt)"