# vim:ft=zsh ts=2 sw=2 sts=2
#
# powerlevel9k Theme - 
#
# This theme is based off of: agnoster's Theme - https://gist.github.com/3712874
#
# # README
#
# In order for this theme to render correctly, you will need a
# [Powerline-patched font](https://github.com/Lokaltog/powerline-fonts).
#

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

# The `CURRENT_BG` variable is used to remember what the last BG color used was
# when building the left-hand prompt. Because the RPROMPT is created from
# right-left but reads the opposite, this isn't necessary for the other side.
CURRENT_BG='NONE'

# These characters require the Powerline fonts to work properly. If see boxes or
# bizarre characters below, your fonts are not correctly installed.
LEFT_SEGMENT_SEPARATOR=''
RIGHT_SEGMENT_SEPARATOR=''

################################################################
# Prompt Segment Constructors
################################################################

# Begin a left prompt segment
# Takes two arguments, background and foreground. Both can be omitted,
# rendering default background/foreground.
left_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{$CURRENT_BG}%}$LEFT_SEGMENT_SEPARATOR%{$fg%} "
  else
    echo -n "%{$bg%}%{$fg%} "
  fi
  CURRENT_BG=$1
  [[ -n $3 ]] && echo -n $3
}

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

# Begin a right prompt segment
# Takes two arguments, background and foreground. Both can be omitted,
# rendering default background/foreground. No ending for the right prompt
# segment is needed (unlike the left prompt, above).
right_prompt_segment() {
  local bg fg
  [[ -n $1 ]] && bg="%K{$1}" || bg="%k"
  [[ -n $2 ]] && fg="%F{$2}" || fg="%f"
    echo -n " %f%F{$1}$RIGHT_SEGMENT_SEPARATOR%f%{$bg%}%{$fg%} "
  [[ -n $3 ]] && echo -n $3
}

################################################################
# Prompt Components
################################################################

# Context: user@hostname (who am I and where am I)
# Note that if $DEFAULT_USER is not set, this prompt segment will always print
prompt_context() {
  if [[ "$USER" != "$DEFAULT_USER" || -n "$SSH_CLIENT" ]]; then
    left_prompt_segment black default "%(!.%{%F{yellow}%}.)$USER@%m"
  fi
}

# Git: branch/detached head, dirty status
prompt_git() {
  local ref dirty mode repo_path
  repo_path=$(git rev-parse --git-dir 2>/dev/null)

  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
    dirty=$(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
      left_prompt_segment yellow black
    else
      left_prompt_segment green black
    fi

    if [[ -e "${repo_path}/BISECT_LOG" ]]; then
      mode=" <B>"
    elif [[ -e "${repo_path}/MERGE_HEAD" ]]; then
      mode=" >M<"
    elif [[ -e "${repo_path}/rebase" || -e "${repo_path}/rebase-apply" || -e "${repo_path}/rebase-merge" || -e "${repo_path}/../.dotest" ]]; then
      mode=" >R>"
    fi

    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 "${ref/refs\/heads\// }${vcs_info_msg_0_%% }${mode}"
  fi
}

# Mercurial status
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
        left_prompt_segment red white
        st='±'
      elif [[ -n $(hg prompt "{status|modified}") ]]; then
        # if any modification
        left_prompt_segment yellow black
        st='±'
      else
        # if working copy is clean
        left_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
        left_prompt_segment red black
        st='±'
      elif `hg st | grep -Eq "^(M|A)"`; then
        left_prompt_segment yellow black
        st='±'
      else
        left_prompt_segment green black
      fi
      echo -n "☿ $rev@$branch" $st
    fi
  fi
}

# Dir: current working directory
prompt_dir() {
  left_prompt_segment blue black '%~'
}

# Virtualenv: current working virtualenv
# More information on virtualenv (Python):
# https://virtualenv.pypa.io/en/latest/virtualenv.html
prompt_virtualenv() {
  local virtualenv_path="$VIRTUAL_ENV"
  if [[ -n $virtualenv_path && -n $VIRTUAL_ENV_DISABLE_PROMPT ]]; then
    left_prompt_segment blue black "(`basename $virtualenv_path`)"
  fi
}

# Left Status: (return code, root status, background jobs)
# This creates a status segment for the *left* prompt
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 "$symbols" ]] && left_prompt_segment black default "$symbols"
}

# Right Status: (return code, root status, background jobs)
# This creates a status segment for the *right* prompt. Exact same thing as
# above - just other side.
rprompt_status() {
  local symbols bg
  symbols=()

  if [[ $RETVAL -ne 0 ]]; then
    symbols+="%{%F{"226"}%}%? ↵"
    bg="009"
  else
    symbols+="%{%F{"046"}%}✓"
    bg="008"
  fi

  [[ $UID -eq 0 ]] && symbols+="%{%F{yellow}%}⚡"
  [[ $(jobs -l | wc -l) -gt 0 ]] && symbols+="%{%F{cyan}%}⚙"

  [[ -n "$symbols" ]] && right_prompt_segment $bg default "$symbols"
}

# System time
prompt_time() {
  right_prompt_segment white black '%D{%H:%M:%S} '
}

# Command number (in local history)
prompt_history() {
  right_prompt_segment "244" black '%h'
}

# Ruby Version Manager information
prompt_rvm() {
  local rvm_prompt
  rvm_prompt=`rvm-prompt`
  if [ "$rvm_prompt" != "" ]; then
    left_prompt_segment "240" white "$rvm_prompt "
  fi
}

# Main prompt
build_left_prompt() {
  #prompt_virtualenv
  prompt_context
  prompt_dir
  prompt_git
  prompt_hg
  #prompt_rvm
  left_prompt_end
}

# Right prompt
build_right_prompt() {
  RETVAL=$?
  rprompt_status
  prompt_history
  prompt_time
}

# Create the prompts
PROMPT='%{%f%b%k%}$(build_left_prompt) '
RPROMPT='%{%f%b%k%}$(build_right_prompt)%{$reset_color%}'