#
# 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=''
SHOW_STASH_SEGMENT=1

# Begin a segment
# 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 $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
    dirty=$(parse_git_dirty)

    if [[ $SHOW_STASH_SEGMENT -eq 1 ]]; then
        stash_size=$(git stash list | wc -l | tr -d ' ')
        if [[ stash_size -ne 0 ]]; then
            prompt_segment white black
            echo -n "+${stash_size}"
        fi
    fi

	ref=$(git symbolic-ref HEAD 2> /dev/null)
	if [[ -z $ref ]]; then
	  detached_head=true;
	  ref="$(git show-ref --head -s --abbrev |head -n1 2> /dev/null)";
	  ref_symbol="➦"
	else
	  detached_head=false;
	  ref=${ref/refs\/heads\//}
	  ref_symbol=""
	fi

    remote=${$(git rev-parse --verify ${hook_com[branch]}@{upstream} --symbolic-full-name 2>/dev/null)/refs\/remotes\/}
    if [[ -n ${remote} ]] ; then
      ahead=$(git rev-list ${hook_com[branch]}@{upstream}..HEAD 2>/dev/null | wc -l | tr -d ' ')
      displayed_ahead=" (+${ahead})"
      behind=$(git rev-list HEAD..${hook_com[branch]}@{upstream} 2>/dev/null | wc -l | tr -d ' ')
    else
      ahead=""
      displayed_ahead=""
      behind=""
    fi

    if [[ $behind -ne 0 ]] && [[ $ahead -ne 0 ]]; then
      prompt_segment red black
    else
      if [[ -n $dirty ]]; then
        prompt_segment yellow black
      else
        prompt_segment green black
      fi
    fi

    echo -n "${ref_symbol} ${ref}${displayed_ahead}"

    setopt promptsubst
    autoload -Uz vcs_info

    zstyle ':vcs_info:*' enable git
    zstyle ':vcs_info:*' get-revision true
    zstyle ':vcs_info:*' check-for-changes true
    zstyle ':vcs_info:*' stagedstr '✚'
    zstyle ':vcs_info:git:*' unstagedstr '●'
    zstyle ':vcs_info:*' formats ' %u%c'
    zstyle ':vcs_info:*' actionformats '%u%c'
    vcs_info
    echo -n "${vcs_info_msg_0_}"

    # Displaying upstream dedicated segment
    if [[ -n $remote ]]; then
      if [[ $behind -ne 0 ]]; then
        prompt_segment magenta white
      else
        prompt_segment cyan black
      fi
      echo -n " $remote (-$behind)"
    fi
  fi
}

prompt_hg() {
	local rev status
	if $(hg id >/dev/null 2>&1); then
		if $(hg prompt >/dev/null 2>&1); then
			if [[ $(hg prompt "{status|unknown}") = "?" ]]; then
				# if files are not added
				prompt_segment red white
				st='±'
			elif [[ -n $(hg prompt "{status|modified}") ]]; then
				# if any modification
				prompt_segment yellow black
				st='±'
			else
				# if working copy is clean
				prompt_segment green black
			fi
			echo -n $(hg prompt " {rev}@{branch}") $st
		else
			st=""
			rev=$(hg id -n 2>/dev/null | sed 's/[^-0-9]//g')
			branch=$(hg id -b 2>/dev/null)
			if `hg st | grep -Eq "^\?"`; then
				prompt_segment red black
				st='±'
			elif `hg st | grep -Eq "^(M|A)"`; then
				prompt_segment yellow black
				st='±'
			else
				prompt_segment green black
			fi
			echo -n " $rev@$branch" $st
		fi
	fi
}

# Dir: current working directory
prompt_dir() {
  prompt_segment blue white '%~'
}

# Virtualenv: current working virtualenv
prompt_virtualenv() {
  local virtualenv_path="$VIRTUAL_ENV"
  if [[ -n $virtualenv_path ]]; then
    prompt_segment blue black "(`basename $virtualenv_path`)"
  fi
}

# 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"
}

prompt_next_line() {
  prompt_segment default yellow "%c>"
  echo -n "%{%f%}"	
}

function vi_mode_prompt_info() {
  echo "${${KEYMAP/vicmd/-- NORMAL --}/(main|viins)/-- INSERT --}" 
}

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

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