Git-Enhanced Bash Prompt Displays color-coded information about your current project on the command line.

.bash_profile

######################################
# Git-Enhanced Bash Prompt           #
######################################
txtred='\033[0;31m'
txtgrn='\033[0;32m'
txtylw='\033[1;33m'
txtltcyn='\033[1;36m'
end='\033[0m'

# Color-Coded Name of Branch
function git_branch_name {
  branch=$(__git_ps1 "%s")
  if [[ -z $branch ]]; then
    return
  fi
  status="$(git status 2>/dev/null)"
  if [[ $status =~ "Untracked files" ]]; then
    branch=${txtred}${branch}${end}
  fi
  if [[ $status =~ "Changed but not updated" ]]; then
    branch=${txtylw}${branch}${end}
  fi
  if [[ $status =~ "Changes to be committed" ]]; then
    branch=${txtgrn}${branch}${end}
  fi
  echo -e "($branch)"
}

# Full System Path to Git Repo
function git_repo_path {
  echo `git rev-parse --show-toplevel 2>/dev/null`
}

# Name of Git Repo w/ Color
function git_repo_name {
  path=`git_repo_path`
  basename=`basename $path`
  repo="${basename//[$'\n',$'\r']/ }"
  echo -e "${txtltcyn}${repo}${end}"
}

# Relative Path Within Repository
function git_working_path {
  path_current=`pwd`
  path_repo=`git rev-parse --show-toplevel 2>/dev/null`
  echo ${path_current#${path_repo}}
}

# Update Bash PS1
function update_bash_prompt {
  if [[ -d `git_repo_path` ]];
    # we're in a git repo
    then
      export PS1='$(git_repo_name) $(git_working_path) $(git_branch_name) \$ '
    # we're not in a git repo :(
    else
      export PS1='\h:\w $ '
  fi
}
# Update on Load
update_bash_prompt;

# Update on CD
function cd () {
  builtin cd "$@" && update_bash_prompt;
}