Custom Agnoster theme - with fish-like collapsed directories and without the unnecessary WHOAMI part and

Agnoster

# vim:ft=zsh ts=2 sw=2 sts=2
#
# agnoster's Theme - https://gist.github.com/3712874
# A Powerline-inspired theme for ZSH
#
# # README
#
# In order for this theme to render correctly, you will need a
# [Powerline-patched font](https://gist.github.com/1595572).
#
# In addition, I recommend the
# [Solarized theme](https://github.com/altercation/solarized/) and, if you're
# using it on Mac OS X, [iTerm 2](http://www.iterm2.com/) over Terminal.app -
# it has significantly better color fidelity.
#
# # Goals
#
# The aim of this theme is to only show you *relevant* information. Like most
# prompts, it will only show git information when in a git working directory.
# However, it goes a step further: everything from the current user and
# hostname to whether the last call exited with an error to whether background
# jobs are running in this shell will all be displayed automatically when
# appropriate.

### Segment drawing
# A few utility functions to make it easy and re-usable to draw segmented prompts

CURRENT_BG='NONE'
SEGMENT_SEPARATOR='⮀'

# Customizations

# Checks if working tree is dirty
# From robbyrussell/oh-my-zsh
parse_git_dirty() {
  local SUBMODULE_SYNTAX=''
  local GIT_STATUS=''
  local CLEAN_MESSAGE='nothing to commit (working directory clean)'
  if [[ "$(command git config --get oh-my-zsh.hide-status)" != "1" ]]; then
    if [[ $POST_1_7_2_GIT -gt 0 ]]; then
          SUBMODULE_SYNTAX="--ignore-submodules=dirty"
    fi
    if [[ "$DISABLE_UNTRACKED_FILES_DIRTY" == "true" ]]; then
        GIT_STATUS=$(command git status -s ${SUBMODULE_SYNTAX} -uno 2> /dev/null | tail -n1)
    else
        GIT_STATUS=$(command git status -s ${SUBMODULE_SYNTAX} 2> /dev/null | tail -n1)
    fi
    if [[ -n $GIT_STATUS ]]; then
      echo "$ZSH_THEME_GIT_PROMPT_DIRTY"
    else
      echo "$ZSH_THEME_GIT_PROMPT_CLEAN"
    fi
  else
    echo "$ZSH_THEME_GIT_PROMPT_CLEAN"
  fi
}

# Takes two arguments, background and foreground. Both can be omitted,
# rendering default background/foreground.
prompt_segment() {
  local bg fg
  [[ -n $1 ]] && bg="%K{$1}" || bg="%k"
  [[ -n $2 ]] && fg="%F{$2}" || fg="%f"
  if [[ $CURRENT_BG != 'NONE' && $1 != $CURRENT_BG ]]; then
    echo -n " %{$bg%F{$CURRENT_BG}%}$SEGMENT_SEPARATOR%{$fg%} "
  else
    echo -n "%{$bg%}%{$fg%} "
  fi
  CURRENT_BG=$1
  [[ -n $3 ]] && echo -n $3
}

# End the prompt, closing any open segments
prompt_end() {
  if [[ -n $CURRENT_BG ]]; then
    echo -n " %{%k%F{$CURRENT_BG}%}$SEGMENT_SEPARATOR"
  else
    echo -n "%{%k%}"
  fi
  echo -n "%{%f%}"
  CURRENT_BG=''
}

### Prompt components
# Each component will draw itself, and hide itself if no information needs to be shown

# Git: branch/detached head, dirty status
prompt_git() {
  local ref dirty
  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
    ZSH_THEME_GIT_PROMPT_DIRTY='±'
    dirty=$(parse_git_dirty)
    ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git show-ref --head -s --abbrev |head -n1 2> /dev/null)"
    if [[ -n $dirty ]]; then
      prompt_segment yellow black
    else
      prompt_segment green black
    fi
    echo -n "${ref/refs\/heads\//⭠ }$dirty"
  fi
}

# Dir: current working directory
prompt_dir() {
  prompt_segment blue black $(pwd | perl -pe "
     BEGIN {
         binmode STDIN,  ':encoding(UTF-8)';
         binmode STDOUT, ':encoding(UTF-8)';
     }; s|^$HOME|~|g; s|/([^/])[^/]*(?=/)|/\$1|g
   ")
}

# Status:
# - was there an error
# - am I root
# - are there background jobs?
prompt_status() {
  local symbols
  symbols=()
  [[ $RETVAL -ne 0 ]] && symbols+="%{%F{red}%}✘"
  [[ $UID -eq 0 ]] && symbols+="%{%F{yellow}%}⚡"
  [[ $(jobs -l | wc -l) -gt 0 ]] && symbols+="%{%F{cyan}%}⚙"

  [[ -n "$symbols" ]] && prompt_segment black default "$symbols"
}

## Main prompt
build_prompt() {
  RETVAL=$?
  prompt_status
  prompt_dir
  prompt_git
  prompt_end
}

PROMPT='%{%f%b%k%}$(build_prompt) '