Bash Script to assemble a prompt that indicates user, host, directory, current branch, repo state.

git_prompt.bash

# Configure colors
c_reset='\[\e[0m\]'
c_user='\[\e[1;33m\]'
c_path='\[\e[0;32m\]'
c_git_clean='\[\e[0;36m\]'
c_git_dirty='\[\e[0;31m\]'

# Function to assemble the Git part of our prompt.
git_prompt ()
{
  if ! git rev-parse --git-dir > /dev/null 2>&1; then
    return 0
  fi

  git_branch=$(git branch 2>/dev/null | sed -n '/^\*/s/^\* //p')

  if git diff --quiet 2>/dev/null >&2; then
    git_color="$c_git_clean"
  else
    git_color="$c_git_dirty"
  fi

  echo " $git_color$git_branch${c_reset}"
}

# The best prompt
PROMPT_COMMAND='PS1="${c_user}\u@\H${c_reset} ${c_path}\w${c_reset}$(git_prompt) > "'

##
# prompt
if [ "$PS1" ]; then
  PS1='\[\e[0;33m\]\u@\h : \w>\[\e[0m\]'
fi