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##
## zsh prompt themes extension
## by Adam Spiers <adam@spiers.net>
##
## Load with `autoload -Uz promptinit; promptinit'.
## Type `prompt -h' for help.
##

typeset -gaU prompt_themes
typeset -ga prompt_theme
typeset -g prompt_newline
prompt_themes=()

promptinit () {
  emulate -L zsh
  setopt extendedglob
  autoload -Uz add-zsh-hook add-zle-hook-widget

  local ppath='' name theme
  local -a match mbegin mend

  # Autoload all prompt_*_setup functions in fpath
  for theme in $^fpath/prompt_*_setup(N); do
    if [[ $theme == */prompt_(#b)(*)_setup ]]; then
      name="$match[1]"
      if [[ -r "$theme" ]]; then
        prompt_themes=($prompt_themes $name)
        autoload -Uz prompt_${name}_setup
      else
        print "Couldn't read file $theme containing theme $name."
      fi
    else
      print "Eh?  Mismatch between glob patterns in promptinit."
    fi
  done

  # Variables common to all prompt styles
  prompt_newline=$'\n%{\r%}'
}

prompt_preview_safely() {
  emulate -L zsh
  print -P "%b%f%k"
  if [[ -z "$prompt_themes[(r)$1]" ]]; then
    print "Unknown theme: $1"
    return
  fi

  # Run this in a subshell, so we don't need to clean up afterwards.
  (
    # Execute current theme's cleanup sequence, if any.
    zstyle -t :prompt-theme cleanup

    # If we can't find a _preview function, run the _setup function to see if
    # it will create one.
    typeset +f prompt_${1}_preview >&/dev/null ||
      prompt_${1}_setup

    # ...then try again.
    if typeset +f prompt_${1}_preview >&/dev/null; then
      prompt_${1}_preview "$@[2,-1]"
    else
      prompt_preview_theme "$@"
    fi
  )
}

set_prompt() {
  emulate -L zsh
  local opt preview theme usage old_theme

  usage='Usage: prompt <options>
Options:
    -c              Show currently selected theme and parameters
    -l              List currently available prompt themes
    -p [<themes>]   Preview given themes (defaults to all)
    -h [<theme>]    Display help (for given theme)
    -s <theme>      Set and save theme
    <theme>         Switch to new theme immediately (changes not saved)

Use prompt -h <theme> for help on specific themes.'

  getopts "chlps:" opt
  case "$opt" in
    c) if [[ -n $prompt_theme ]]; then
         print -n "Current prompt theme"
         (( $#prompt_theme > 1 )) && print -n " with parameters"
         print " is:\n  $prompt_theme"
       else
         print "Current prompt is not a theme."
       fi
       return
       ;;
    h) if [[ -n "$2" && -n $prompt_themes[(r)$2] ]]; then
         # Run this in a subshell, so we don't need to clean up afterwards.
         (
           # Execute current theme's cleanup sequence, if any.
           zstyle -t :prompt-theme cleanup

           # If we can't find a _help function, run the _setup function to see
           # if it will create one.
           typeset +f prompt_$2_help >/dev/null ||
               prompt_$2_setup

           # ...then try again.
           if typeset +f prompt_$2_help >/dev/null; then
             print "Help for $2 theme:\n"
             prompt_$2_help
           else
             print "No help available for $2 theme."
           fi
           print "\nType \`prompt -p $2' to preview the theme, \`prompt $2'"
           print "to try it out, and \`prompt -s $2' to use it in future sessions."
         )
       else
         print "$usage"
       fi
       ;;
    l) print Currently available prompt themes:
       print $prompt_themes
       return
       ;;
    p) preview=( $prompt_themes )
       (( $#* > 1 )) && preview=( "$@[2,-1]" )
       for theme in $preview; do
         [[ "$theme" == "$prompt_theme[*]" ]] && continue
         prompt_preview_safely "$=theme"
       done
       print -P "%b%f%k"
       ;;
    s) print "Set and save not yet implemented.  Please ensure your ~/.zshrc"
       print "contains something similar to the following:\n"
       print "  autoload -Uz promptinit"
       print "  promptinit"
       print "  prompt $*[2,-1]"
       shift
       ;&
    *) if [[ "$1" == 'random' ]]; then
         local random_themes
         if (( $#* == 1 )); then
           random_themes=( $prompt_themes )
         else
           random_themes=( "$@[2,-1]" )
         fi
         local i=$(( ( $RANDOM % $#random_themes ) + 1 ))
         argv=( "${=random_themes[$i]}" )
       fi
       if [[ -z "$1" || -z $prompt_themes[(r)$1] ]]; then
         print "$usage"
         return
       fi

       # Reset some commonly altered bits to the default
       local hook
       for hook in chpwd precmd preexec periodic zshaddhistory zshexit \
           zsh_directory_name; do
         add-zsh-hook -D "$hook" "prompt_*_$hook"
       done
       for hook in isearch-exit isearch-update line-pre-redraw line-init \
           line-finish history-line-set keymap-select; do
         add-zle-hook-widget -D "$hook" "prompt_*_$hook"
       done
       typeset -ga zle_highlight=( ${zle_highlight:#default:*} )
       (( ${#zle_highlight} )) || unset zle_highlight

       zstyle -t :prompt-theme cleanup
       prompt_$1_setup "$@[2,-1]" && prompt_theme=( "$@" )
       ;;
  esac
}

prompt_cleanup () {
  local -a cleanup_hooks theme_active
  if ! zstyle -g cleanup_hooks :prompt-theme cleanup; then
    if ! zstyle -g theme_active :prompt-theme restore; then
      print -u2 "prompt_cleanup: no prompt theme active"
      return 1
    fi

    # Set the cleanup sequence up.
    zstyle -e :prompt-theme cleanup \
        'zstyle -d :prompt-theme cleanup;' \
        'reply=(yes)'
    zstyle -g cleanup_hooks :prompt-theme cleanup
  fi

  cleanup_hooks+=(';' "$@")
  zstyle -e :prompt-theme cleanup "${cleanup_hooks[@]}"
}

prompt () {
  local -a prompt_opts theme_active

  zstyle -g theme_active :prompt-theme restore || {
    # This is done here rather than in set_prompt so that it
    # is safe and sane for set_prompt to setopt localoptions,
    # which will be cleared before we arrive back here again.
    # This is also why we pass around the prompt_opts array.
    [[ -o promptbang ]] && prompt_opts+=(bang)
    [[ -o promptcr ]] && prompt_opts+=(cr)
    [[ -o promptpercent ]] && prompt_opts+=(percent)
    [[ -o promptsp ]] && prompt_opts+=(sp)
    [[ -o promptsubst ]] && prompt_opts+=(subst)
    zstyle -e :prompt-theme restore "
        zstyle -d :prompt-theme restore
        prompt_default_setup
        ${PS1+PS1=${(q+)PS1}}
        ${PS2+PS2=${(q+)PS2}}
        ${PS3+PS3=${(q+)PS3}}
        ${PS4+PS4=${(q+)PS4}}
        ${RPS1+RPS1=${(q+)RPS1}}
        ${RPS2+RPS2=${(q+)RPS2}}
        ${RPROMPT+RPROMPT=${(q+)RPROMPT}}
        ${RPROMPT2+RPROMPT2=${(q+)RPROMPT2}}
        ${PSVAR+PSVAR=${(q+)PSVAR}}
        $( add-zsh-hook -L )
        $( add-zle-hook-widget -L )
        prompt_opts=( $prompt_opts[*] )
        reply=( yes )
    "
  }
  set_prompt "$@"

  (( ${#prompt_opts} )) &&
      setopt noprompt{bang,cr,percent,sp,subst} "prompt${^prompt_opts[@]}"

  true
}

prompt_preview_theme () {
  emulate -L zsh

  # Minimal preview for prompts that don't supply one
  local -a prompt_opts
  print -n "$1 theme"
  (( $#* > 1 )) && print -n " with parameters \`$*[2,-1]'"
  print ":"
  zstyle -t :prompt-theme cleanup
  prompt_${1}_setup "$@[2,-1]"
  (( ${#prompt_opts} )) &&
      setopt noprompt{bang,cr,percent,sp,subst} "prompt${^prompt_opts[@]}"

  [[ -n ${chpwd_functions[(r)prompt_${1}_chpwd]} ]] &&
      prompt_${1}_chpwd
  [[ -n ${precmd_functions[(r)prompt_${1}_precmd]} ]] &&
      prompt_${1}_precmd

  # We'd like to call zle-line-init/finish hooks, too, but that's not possible
  # while the ZLE is not active.

  [[ -o promptcr ]] && print -n $'\r'
  :; print -P -- "${PS1}command arg1 arg2 ... argn"

  [[ -n ${preexec_functions[(r)prompt_${1}_preexec]} ]] &&
      prompt_${1}_preexec
}

[[ -o kshautoload ]] || promptinit "$@"
debug log:

solving a6c9e31dd ...
found a6c9e31dd in http://inbox.vuxu.org/zsh-workers/E5F5E0AF-0A2B-451C-8981-1341D1DB541E@gmail.com/
found 37d69f100 in https://git.vuxu.org/mirror/zsh/
preparing index
index prepared:
100644 37d69f100fe1ad650025a08797c5f601c2c53451	Functions/Prompts/promptinit

applying [1/1] http://inbox.vuxu.org/zsh-workers/E5F5E0AF-0A2B-451C-8981-1341D1DB541E@gmail.com/
diff --git a/Functions/Prompts/promptinit b/Functions/Prompts/promptinit
index 37d69f100..a6c9e31dd 100644

Checking patch Functions/Prompts/promptinit...
Applied patch Functions/Prompts/promptinit cleanly.

index at:
100644 a6c9e31dd93b83f23168fda725be07563a03cada	Functions/Prompts/promptinit

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