To get a prompt which indicates Git-branch in Zsh

Question

I run the following codes separately as my prompt unsuccessfully in .zshrc. This suggests me that apparently I do not have a program called __git_ps1. It is not in MacPorts.

Answer 1

I just redid mine since we have long branch names at work. This one will truncate with an ellipsis if it's more than 35 characters.

parse_git_branch() {
    git_status="$(git status 2> /dev/null)"
    pattern="On branch ([^[:space:]]*)"
    if [[ ! ${git_status} =~ "(working (tree|directory) clean)" ]]; then
        state="*"
    fi
    if [[ ${git_status} =~ ${pattern} ]]; then
      branch=${match[1]}
      branch_cut=${branch:0:35}
      if (( ${#branch} > ${#branch_cut} )); then
          echo "(${branch_cut}…${state})"
      else
          echo "(${branch}${state})"
      fi
    fi
}

setopt PROMPT_SUBST
PROMPT='%{%F{blue}%}%9c%{%F{none}%}$(parse_git_branch)$'

(I'm embarrassed at how proud I am of this.)