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;;; helm-command.el --- Helm execute-exended-command. -*- lexical-binding: t -*-
;; Copyright (C) 2012 ~ 2015 Thierry Volpiatto <thierry.volpiatto@gmail.com>
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'cl-lib)
(require 'helm)
(require 'helm-mode)
(require 'helm-elisp)
(defgroup helm-command nil
"Emacs command related Applications and libraries for Helm."
:group 'helm)
(defcustom helm-M-x-requires-pattern 0
"Value of requires-pattern for `helm-M-x'.
Show all candidates on startup when 0 (default)."
:group 'helm-command
:type 'boolean)
(defcustom helm-M-x-always-save-history nil
"`helm-M-x' Save command in `extended-command-history' even when it fail."
:group 'helm-command
:type 'boolean)
(defcustom helm-M-x-reverse-history nil
"The history source of `helm-M-x' appear in second position when non--nil."
:group 'helm-command
:type 'boolean)
(defcustom helm-M-x-fuzzy-match nil
"Enable fuzzy matching in `helm-M-x' when non--nil.")
;;; Faces
;;
;;
(defgroup helm-command-faces nil
"Customize the appearance of helm-command."
:prefix "helm-"
:group 'helm-command
:group 'helm-faces)
(defface helm-M-x-key '((t (:foreground "orange" :underline t)))
"Face used in helm-M-x to show keybinding."
:group 'helm-command-faces)
(defvar helm-M-x-input-history nil)
(defvar helm-M-x-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map helm-map)
(define-key map (kbd "C-c ?") 'helm-M-x-help)
map)
"Keymap for `helm-M-x'.")
(cl-defun helm-M-x-get-major-mode-command-alist (mode-map)
"Return alist of MODE-MAP."
(cl-loop for key being the key-seqs of mode-map using (key-bindings com)
for str-key = (key-description key)
for ismenu = (string-match "<menu-bar>" str-key)
unless ismenu collect (cons str-key com)))
(defun helm-get-mode-map-from-mode (mode)
"Guess the mode-map name according to MODE.
Some modes don't use conventional mode-map name
so we need to guess mode-map name. e.g python-mode ==> py-mode-map.
Return nil if no mode-map found."
(cl-loop ;; Start with a conventional mode-map name.
with mode-map = (intern-soft (format "%s-map" mode))
with mode-string = (symbol-name mode)
with mode-name = (replace-regexp-in-string "-mode" "" mode-string)
while (not mode-map)
for count downfrom (length mode-name)
;; Return when no result after parsing entire string.
when (eq count 0) return nil
for sub-name = (substring mode-name 0 count)
do (setq mode-map (intern-soft (format "%s-map" (concat sub-name "-mode"))))
finally return mode-map))
(defun helm-M-x-current-mode-map-alist ()
"Return mode-map alist of current `major-mode'."
(let ((map (helm-get-mode-map-from-mode major-mode)))
(when (and map (boundp map))
(helm-M-x-get-major-mode-command-alist (symbol-value map)))))
(defun helm-M-x-transformer-1 (candidates &optional sort)
"Transformer function to show bindings in emacs commands.
Show global bindings and local bindings according to current `major-mode'.
If SORT is non nil sort list with `helm-generic-sort-fn'.
Note that SORT should not be used when fuzzy matching because
fuzzy matching is running its own sort function with a different algorithm."
(with-helm-current-buffer
(cl-loop with local-map = (helm-M-x-current-mode-map-alist)
for cand in candidates
for local-key = (car (rassq cand local-map))
for key = (substitute-command-keys (format "\\[%s]" cand))
collect
(cons (cond ((and (string-match "^M-x" key) local-key)
(format "%s (%s)"
cand (propertize
local-key
'face 'helm-M-x-key)))
((string-match "^M-x" key) cand)
(t (format "%s (%s)"
cand (propertize
key
'face 'helm-M-x-key))))
cand)
into ls
finally return
(if sort (sort ls #'helm-generic-sort-fn) ls))))
(defun helm-M-x-transformer (candidates _source)
"Transformer function for `helm-M-x' candidates."
(helm-M-x-transformer-1 candidates (null helm--in-fuzzy)))
(defun helm-M-x-transformer-hist (candidates _source)
"Transformer function for `helm-M-x' candidates."
(helm-M-x-transformer-1 candidates))
(defun helm-M-x--notify-prefix-arg ()
;; Notify a prefix-arg set AFTER calling M-x.
(when prefix-arg
(with-helm-window
(helm-display-mode-line (helm-get-current-source) 'force))))
;;;###autoload
(defun helm-M-x ()
"Preconfigured `helm' for Emacs commands.
It is `helm' replacement of regular `M-x' `execute-extended-command'.
Unlike regular `M-x' emacs vanilla `execute-extended-command' command,
the prefix args if needed, are passed AFTER starting `helm-M-x'.
You can get help on each command by persistent action."
(interactive)
(let* ((history (cl-loop for i in extended-command-history
when (commandp (intern i))
do (set-text-properties 0 (length i) nil i)
and collect i))
command sym-com in-help help-cand
(orig-fuzzy-sort-fn helm-fuzzy-sort-fn)
(helm-fuzzy-sort-fn (lambda (candidates source)
(funcall orig-fuzzy-sort-fn candidates source 'real)))
(helm--mode-line-display-prefarg t)
(pers-help #'(lambda (candidate)
(let ((hbuf (get-buffer (help-buffer))))
(if (and in-help (string= candidate help-cand)
(null helm-persistent-action-use-special-display))
(progn
;; When M-x is started from a help buffer,
;; Don't kill it as it is helm-current-buffer.
(unless (equal hbuf helm-current-buffer)
(kill-buffer hbuf)
(set-window-buffer (get-buffer-window hbuf)
helm-current-buffer))
(setq in-help nil))
(helm-describe-function candidate)
(setq in-help t))
(setq help-cand candidate))))
(tm (run-at-time 1 0.1 'helm-M-x--notify-prefix-arg)))
(unwind-protect
(let ((msg "Error: Specifying a prefix arg before calling `helm-M-x'"))
(when current-prefix-arg
(ding)
(message "%s" msg)
(while (not (sit-for 1))
(discard-input))
(user-error msg))
(setq current-prefix-arg nil)
(setq command (helm-comp-read
"M-x " obarray
:test 'commandp
:requires-pattern helm-M-x-requires-pattern
:name "Emacs Commands"
:buffer "*helm M-x*"
:persistent-action pers-help
:persistent-help "Describe this command"
:history history
:reverse-history helm-M-x-reverse-history
:del-input nil
:mode-line helm-M-x-mode-line
:must-match t
:fuzzy helm-M-x-fuzzy-match
:nomark t
:keymap helm-M-x-map
:candidates-in-buffer t
:fc-transformer 'helm-M-x-transformer
:hist-fc-transformer 'helm-M-x-transformer-hist)))
(cancel-timer tm)
(setq helm--mode-line-display-prefarg nil))
(setq sym-com (intern command))
(setq current-prefix-arg helm-current-prefix-arg)
;; Avoid having `this-command' set to *exit-minibuffer.
(setq this-command sym-com
;; Handle C-x z (repeat) Issue #322
real-this-command sym-com)
(let ((prefix-arg current-prefix-arg))
;; This ugly construct is to save history even on error.
(unless helm-M-x-always-save-history
(command-execute sym-com 'record))
(setq extended-command-history
(cons command (delete command history)))
(when helm-M-x-always-save-history
(command-execute sym-com 'record)))))
(provide 'helm-command)
;; Local Variables:
;; byte-compile-warnings: (not cl-functions obsolete)
;; coding: utf-8
;; indent-tabs-mode: nil
;; End:
;;; helm-command.el ends here
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