;;; helm-command.el --- Helm execute-exended-command. -*- lexical-binding: t -*-
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;; Copyright (C) 2012 ~ 2018 Thierry Volpiatto <thierry.volpiatto@gmail.com>
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(require 'cl-lib)
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(require 'helm)
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(require 'helm-help)
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(require 'helm-mode)
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(require 'helm-elisp)
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(defgroup helm-command nil
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"Emacs command related Applications and libraries for Helm."
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:group 'helm)
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(defcustom helm-M-x-requires-pattern 0
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"Value of requires-pattern for `helm-M-x'.
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Show all candidates on startup when 0 (default)."
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:group 'helm-command
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:type 'boolean)
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(defcustom helm-M-x-always-save-history nil
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"`helm-M-x' Save command in `extended-command-history' even when it fail."
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:group 'helm-command
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:type 'boolean)
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(defcustom helm-M-x-reverse-history nil
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"The history source of `helm-M-x' appear in second position when non--nil."
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:group 'helm-command
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:type 'boolean)
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(defcustom helm-M-x-fuzzy-match nil
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"Enable fuzzy matching in `helm-M-x' when non--nil."
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:group 'helm-command
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:type 'boolean)
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(defcustom helm-M-x-default-sort-fn #'helm-M-x-fuzzy-sort-candidates
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"Default sort function for `helm-M-x'.
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It should sort against REAL value of candidates.
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It is used only when `helm-M-x-fuzzy-match' is enabled."
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:group 'helm-command
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:type 'function)
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;;; Faces
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;;
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;;
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(defgroup helm-command-faces nil
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"Customize the appearance of helm-command."
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:prefix "helm-"
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:group 'helm-command
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:group 'helm-faces)
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(defface helm-M-x-key '((t (:foreground "orange" :underline t)))
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"Face used in helm-M-x to show keybinding."
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:group 'helm-command-faces)
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(defvar helm-M-x-input-history nil)
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(defvar helm-M-x-prefix-argument nil
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"Prefix argument before calling `helm-M-x'.")
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(defun helm-M-x-get-major-mode-command-alist (mode-map)
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"Return alist of MODE-MAP."
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(when mode-map
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(cl-loop for key being the key-seqs of mode-map using (key-bindings com)
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for str-key = (key-description key)
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for ismenu = (string-match "<menu-bar>" str-key)
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unless ismenu collect (cons str-key com))))
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(defun helm-get-mode-map-from-mode (mode)
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"Guess the mode-map name according to MODE.
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Some modes don't use conventional mode-map name
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so we need to guess mode-map name. e.g python-mode ==> py-mode-map.
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Return nil if no mode-map found."
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(cl-loop ;; Start with a conventional mode-map name.
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with mode-map = (intern-soft (format "%s-map" mode))
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with mode-string = (symbol-name mode)
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with mode-name = (replace-regexp-in-string "-mode" "" mode-string)
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while (not mode-map)
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for count downfrom (length mode-name)
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;; Return when no result after parsing entire string.
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when (eq count 0) return nil
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for sub-name = (substring mode-name 0 count)
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do (setq mode-map (intern-soft (format "%s-map" (concat sub-name "-mode"))))
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finally return mode-map))
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(defun helm-M-x-current-mode-map-alist ()
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"Return mode-map alist of current `major-mode'."
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(let ((map-sym (helm-get-mode-map-from-mode major-mode)))
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(when (and map-sym (boundp map-sym))
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(helm-M-x-get-major-mode-command-alist (symbol-value map-sym)))))
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(defun helm-M-x-transformer-1 (candidates &optional sort)
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"Transformer function to show bindings in emacs commands.
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Show global bindings and local bindings according to current `major-mode'.
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If SORT is non nil sort list with `helm-generic-sort-fn'.
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Note that SORT should not be used when fuzzy matching because
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fuzzy matching is running its own sort function with a different algorithm."
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(with-helm-current-buffer
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(cl-loop with local-map = (helm-M-x-current-mode-map-alist)
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for cand in candidates
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for local-key = (car (rassq cand local-map))
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for key = (substitute-command-keys (format "\\[%s]" cand))
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unless (get (intern (if (consp cand) (car cand) cand)) 'helm-only)
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collect
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(cons (cond ((and (string-match "^M-x" key) local-key)
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(format "%s (%s)"
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cand (propertize
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local-key
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'face 'helm-M-x-key)))
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((string-match "^M-x" key) cand)
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(t (format "%s (%s)"
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cand (propertize
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key
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'face 'helm-M-x-key))))
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cand)
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into ls
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finally return
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(if sort (sort ls #'helm-generic-sort-fn) ls))))
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(defun helm-M-x-transformer (candidates _source)
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"Transformer function for `helm-M-x' candidates."
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(helm-M-x-transformer-1 candidates (null helm--in-fuzzy)))
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(defun helm-M-x-transformer-hist (candidates _source)
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"Transformer function for `helm-M-x' candidates."
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(helm-M-x-transformer-1 candidates))
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(defun helm-M-x--notify-prefix-arg ()
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;; Notify a prefix-arg set AFTER calling M-x.
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(when prefix-arg
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(with-helm-window
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(helm-display-mode-line (helm-get-current-source) 'force))))
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(defun helm-cmd--get-current-function-name ()
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(save-excursion
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(beginning-of-defun)
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(cadr (split-string (buffer-substring-no-properties
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(point-at-bol) (point-at-eol))))))
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(defun helm-cmd--get-preconfigured-commands (&optional dir)
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(let* ((helm-dir (or dir (helm-basedir (locate-library "helm"))))
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(helm-autoload-file (expand-file-name "helm-autoloads.el" helm-dir))
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results)
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(when (file-exists-p helm-autoload-file)
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(with-temp-buffer
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(insert-file-contents helm-autoload-file)
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(while (re-search-forward "Preconfigured" nil t)
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(push (substring (helm-cmd--get-current-function-name) 1) results))))
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results))
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(defvar helm-M-x-map
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(let ((map (make-sparse-keymap)))
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(set-keymap-parent map helm-comp-read-map)
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(define-key map (kbd "C-u") nil)
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(define-key map (kbd "C-u") 'helm-M-x-universal-argument)
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map))
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(defun helm-M-x-universal-argument ()
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"Same as `universal-argument' but for `helm-M-x'."
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(interactive)
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(if helm-M-x-prefix-argument
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(progn (setq helm-M-x-prefix-argument nil)
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(let ((inhibit-read-only t))
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(with-selected-window (minibuffer-window)
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(save-excursion
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(goto-char (point-min))
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(delete-char (- (minibuffer-prompt-width) (length "M-x "))))))
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(message "Initial prefix arg disabled"))
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(setq prefix-arg (list 4))
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(universal-argument--mode)))
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(put 'helm-M-x-universal-argument 'helm-only t)
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(defun helm-M-x-fuzzy-sort-candidates (candidates _source)
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(helm-fuzzy-matching-default-sort-fn-1 candidates t))
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(defun helm-M-x-read-extended-command (&optional collection history)
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"Read command name to invoke in `helm-M-x'.
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Helm completion is not provided when executing or defining
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kbd macros.
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Optional arg COLLECTION is to allow using another COLLECTION
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than the default which is OBARRAY."
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(if (or defining-kbd-macro executing-kbd-macro)
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(if helm-mode
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(unwind-protect
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(progn
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(helm-mode -1)
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(read-extended-command))
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(helm-mode 1))
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(read-extended-command))
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(let* ((helm-fuzzy-sort-fn helm-M-x-default-sort-fn)
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(helm--mode-line-display-prefarg t)
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(tm (run-at-time 1 0.1 'helm-M-x--notify-prefix-arg))
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(helm-move-selection-after-hook
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(cons (lambda () (setq current-prefix-arg nil))
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helm-move-selection-after-hook)))
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(setq extended-command-history
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(cl-loop for c in extended-command-history
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when (and c (commandp (intern c)))
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do (set-text-properties 0 (length c) nil c)
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and collect c))
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(unwind-protect
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(progn
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(setq current-prefix-arg nil)
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(helm-comp-read
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(concat (cond
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((eq helm-M-x-prefix-argument '-) "- ")
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((and (consp helm-M-x-prefix-argument)
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(eq (car helm-M-x-prefix-argument) 4)) "C-u ")
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((and (consp helm-M-x-prefix-argument)
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(integerp (car helm-M-x-prefix-argument)))
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(format "%d " (car helm-M-x-prefix-argument)))
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((integerp helm-M-x-prefix-argument)
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(format "%d " helm-M-x-prefix-argument)))
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"M-x ")
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(or collection obarray)
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:test 'commandp
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:requires-pattern helm-M-x-requires-pattern
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:name "Emacs Commands"
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:buffer "*helm M-x*"
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:persistent-action (lambda (candidate)
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(helm-elisp--persistent-help
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candidate 'helm-describe-function))
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:persistent-help "Describe this command"
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:history (or history extended-command-history)
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:reverse-history helm-M-x-reverse-history
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:input-history 'helm-M-x-input-history
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:del-input nil
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:help-message 'helm-M-x-help-message
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:keymap helm-M-x-map
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:must-match t
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:match-part (lambda (c) (car (split-string c)))
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:fuzzy helm-M-x-fuzzy-match
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:nomark t
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:candidates-in-buffer t
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:fc-transformer 'helm-M-x-transformer
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:hist-fc-transformer 'helm-M-x-transformer-hist))
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(cancel-timer tm)
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(setq helm--mode-line-display-prefarg nil)))))
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;;;###autoload
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(defun helm-M-x (_arg &optional command-name)
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"Preconfigured `helm' for Emacs commands.
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It is `helm' replacement of regular `M-x' `execute-extended-command'.
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Unlike regular `M-x' emacs vanilla `execute-extended-command' command,
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the prefix args if needed, can be passed AFTER starting `helm-M-x'.
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When a prefix arg is passed BEFORE starting `helm-M-x', the first `C-u'
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while in `helm-M-x' session will disable it.
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You can get help on each command by persistent action."
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(interactive
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(progn
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(setq helm-M-x-prefix-argument current-prefix-arg)
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(list current-prefix-arg (helm-M-x-read-extended-command))))
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(unless (string= command-name "")
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(let ((sym-com (and (stringp command-name) (intern-soft command-name))))
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(when sym-com
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;; Avoid having `this-command' set to *exit-minibuffer.
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(setq this-command sym-com
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;; Handle C-x z (repeat) Issue #322
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real-this-command sym-com)
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;; If helm-M-x is called with regular emacs completion (kmacro)
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;; use the value of arg otherwise use helm-current-prefix-arg.
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(let ((prefix-arg (or helm-current-prefix-arg helm-M-x-prefix-argument)))
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(cl-flet ((save-hist (command)
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(setq extended-command-history
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(cons command (delete command extended-command-history)))))
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(condition-case-unless-debug err
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(progn
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(command-execute sym-com 'record)
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(save-hist command-name))
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(error
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(when helm-M-x-always-save-history
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(save-hist command-name))
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(signal (car err) (cdr err))))))))))
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(put 'helm-M-x 'interactive-only 'command-execute)
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(provide 'helm-command)
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;; Local Variables:
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;; byte-compile-warnings: (not obsolete)
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;; coding: utf-8
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;; indent-tabs-mode: nil
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;; End:
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;;; helm-command.el ends here
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