Custom dash prompt which displays current branch and dirty status in the prompt line when in a git repository folder. Add to .bashrc or another file executed by it like .bash_aliases.

.bashrc

RS="\033[0m"    # reset
HC="\033[1m"    # hicolor
INV="\033[7m"   # inverse background and foreground

function git_dirty() {
  if [[ $(git diff --shortstat 2> /dev/null | tail -n1) != "" ]]; then
     echo -n "\[$INV\]*"
  else
     echo -n "\[$HC\]"
  fi
}

function get_git_branch() {
  local br=$(git branch 2> /dev/null | grep "*" | sed 's/* //g')
  [ -n "$br" ] && echo ":$(git_dirty)$br\[$RS\]"
}

function prompt() {
  PS1="\u@\h$(get_git_branch):\w\$ "
  export PS1
}

PROMPT_COMMAND=prompt