mirror of
https://git.savannah.gnu.org/git/emacs.git
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335028c3be
Accept both minor mode string and minor mode indicator. (describe-minor-mode-completion-table-for-indicator) (describe-minor-mode-completion-table-for-symbol): New functions. minor-mode-list is used here. (describe-minor-mode-from-symbol): renamed from (old) describe-minor-mode. Use describe-minor-mode-completion-table-for-symbol. Don't use eval. Just use symbol-name. (describe-minor-mode-from-indicator): Document is updated. Use `format-mode-line'. Use describe-minor-mode-from-symbol instead of describe-minor-mode. Use describe-minor-mode-completion-table-for-indicator. (expand-minor-mode-indicator-object): removed. (lookup-minor-mode-from-indicator): remove the fist white space from both indicator and anindicator before comparing them. * bindings.el (mode-line-major-mode-keymap) (mode-line-minor-mode-keymap): defined keys for the maps here in `defvar'.
748 lines
28 KiB
EmacsLisp
748 lines
28 KiB
EmacsLisp
;;; help.el --- help commands for Emacs
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;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002
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;; Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: help, internal
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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 2, or (at your option)
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;; any later version.
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;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This code implements GNU Emacs' on-line help system, the one invoked by
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;; `M-x help-for-help'.
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;;; Code:
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;; Get the macro make-help-screen when this is compiled,
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;; or run interpreted, but not when the compiled code is loaded.
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(eval-when-compile (require 'help-macro))
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;; This makes `with-output-to-temp-buffer' buffers use `help-mode'.
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(add-hook 'temp-buffer-setup-hook 'help-mode-setup)
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(add-hook 'temp-buffer-show-hook 'help-mode-finish)
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(defvar help-map (make-sparse-keymap)
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"Keymap for characters following the Help key.")
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(define-key global-map (char-to-string help-char) 'help-command)
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(define-key global-map [help] 'help-command)
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(define-key global-map [f1] 'help-command)
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(fset 'help-command help-map)
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(define-key help-map (char-to-string help-char) 'help-for-help)
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(define-key help-map [help] 'help-for-help)
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(define-key help-map [f1] 'help-for-help)
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(define-key help-map "?" 'help-for-help)
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(define-key help-map "\C-c" 'describe-copying)
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(define-key help-map "\C-d" 'describe-distribution)
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(define-key help-map "\C-e" 'view-emacs-problems)
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(define-key help-map "\C-f" 'view-emacs-FAQ)
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(define-key help-map "\C-m" 'view-order-manuals)
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(define-key help-map "\C-n" 'view-emacs-news)
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(define-key help-map "\C-p" 'describe-project)
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(define-key help-map "\C-t" 'view-todo)
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(define-key help-map "\C-w" 'describe-no-warranty)
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;; This does not fit the pattern, but it is natural given the C-\ command.
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(define-key help-map "\C-\\" 'describe-input-method)
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(define-key help-map "C" 'describe-coding-system)
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(define-key help-map "F" 'Info-goto-emacs-command-node)
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(define-key help-map "I" 'describe-input-method)
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(define-key help-map "K" 'Info-goto-emacs-key-command-node)
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(define-key help-map "L" 'describe-language-environment)
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(define-key help-map "S" 'info-lookup-symbol)
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(define-key help-map "a" 'apropos-command)
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(define-key help-map "b" 'describe-bindings)
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(define-key help-map "c" 'describe-key-briefly)
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(define-key help-map "e" 'view-echo-area-messages)
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(define-key help-map "f" 'describe-function)
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(define-key help-map "h" 'view-hello-file)
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(define-key help-map "i" 'info)
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(define-key help-map "4i" 'info-other-window)
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(define-key help-map "k" 'describe-key)
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(define-key help-map "l" 'view-lossage)
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(define-key help-map "m" 'describe-mode)
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(define-key help-map "n" 'view-emacs-news)
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(define-key help-map "p" 'finder-by-keyword)
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(autoload 'finder-by-keyword "finder"
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"Find packages matching a given keyword." t)
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(define-key help-map "r" 'info-emacs-manual)
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(define-key help-map "s" 'describe-syntax)
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(define-key help-map "t" 'help-with-tutorial)
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(define-key help-map "w" 'where-is)
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(define-key help-map "v" 'describe-variable)
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(define-key help-map "q" 'help-quit)
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(defun help-quit ()
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"Just exit from the Help command's command loop."
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(interactive)
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nil)
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(defvar help-return-method nil
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"What to do to \"exit\" the help buffer.
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This is a list
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(WINDOW . t) delete the selected window, go to WINDOW.
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(WINDOW . quit-window) do quit-window, then select WINDOW.
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(WINDOW BUF START POINT) display BUF at START, POINT, then select WINDOW.")
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(defun print-help-return-message (&optional function)
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"Display or return message saying how to restore windows after help command.
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This function assumes that `standard-output' is the help buffer.
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It computes a message, and applies the optional argument FUNCTION to it.
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If FUNCTION is nil, it applies `message', thus displaying the message."
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(and (not (get-buffer-window standard-output))
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(let ((first-message
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(cond ((special-display-p (buffer-name standard-output))
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(setq help-return-method (cons (selected-window) t))
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;; If the help output buffer is a special display buffer,
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;; don't say anything about how to get rid of it.
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;; First of all, the user will do that with the window
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;; manager, not with Emacs.
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;; Secondly, the buffer has not been displayed yet,
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;; so we don't know whether its frame will be selected.
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nil)
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(display-buffer-reuse-frames
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(setq help-return-method (cons (selected-window)
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'quit-window))
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nil)
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((not (one-window-p t))
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(setq help-return-method
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(cons (selected-window) 'quit-window))
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"Type \\[switch-to-buffer-other-window] RET to restore the other window.")
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(pop-up-windows
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(setq help-return-method (cons (selected-window) t))
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"Type \\[delete-other-windows] to remove help window.")
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(t
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(setq help-return-method
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(list (selected-window) (window-buffer)
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(window-start) (window-point)))
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"Type \\[switch-to-buffer] RET to remove help window."))))
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(funcall (or function 'message)
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(concat
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(if first-message
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(substitute-command-keys first-message))
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(if first-message " ")
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;; If the help buffer will go in a separate frame,
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;; it's no use mentioning a command to scroll, so don't.
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(if (special-display-p (buffer-name standard-output))
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nil
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(if (same-window-p (buffer-name standard-output))
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;; Say how to scroll this window.
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(substitute-command-keys
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"\\[scroll-up] to scroll the help.")
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;; Say how to scroll some other window.
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(substitute-command-keys
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"\\[scroll-other-window] to scroll the help."))))))))
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;; So keyboard macro definitions are documented correctly
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(fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
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(defalias 'help 'help-for-help)
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(make-help-screen help-for-help
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"a b c C e f F i I k C-k l L m p s t v w C-c C-d C-f C-n C-p C-t C-w or ? :"
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"You have typed %THIS-KEY%, the help character. Type a Help option:
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\(Use SPC or DEL to scroll through this text. Type \\<help-map>\\[help-quit] to exit the Help command.)
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a command-apropos. Give a substring, and see a list of commands
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(functions interactively callable) that contain
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that substring. See also the apropos command.
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b describe-bindings. Display table of all key bindings.
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c describe-key-briefly. Type a command key sequence;
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it prints the function name that sequence runs.
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C describe-coding-system. This describes either a specific coding system
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(if you type its name) or the coding systems currently in use
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(if you type just RET).
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e view-echo-area-messages. Show the `*Messages*' buffer.
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f describe-function. Type a function name and get documentation of it.
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F Info-goto-emacs-command-node. Type a function name;
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it takes you to the Info node for that command.
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h Display the HELLO file which illustrates various scripts.
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i info. The info documentation reader.
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I describe-input-method. Describe a specific input method (if you type
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its name) or the current input method (if you type just RET).
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k describe-key. Type a command key sequence;
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it displays the full documentation.
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K Info-goto-emacs-key-command-node. Type a command key sequence;
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it takes you to the Info node for the command bound to that key.
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l view-lossage. Show last 100 characters you typed.
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L describe-language-environment. This describes either a
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specific language environment (if you type its name)
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or the current language environment (if you type just RET).
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m describe-mode. Print documentation of current minor modes,
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and the current major mode, including their special commands.
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p finder-by-keyword. Find packages matching a given topic keyword.
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s describe-syntax. Display contents of syntax table, plus explanations.
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S info-lookup-symbol. Display the definition of a specific symbol
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as found in the manual for the language this buffer is written in.
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t help-with-tutorial. Select the Emacs learn-by-doing tutorial.
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v describe-variable. Type name of a variable;
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it displays the variable's documentation and value.
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w where-is. Type command name; it prints which keystrokes
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invoke that command.
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C-c Display Emacs copying permission (GNU General Public License).
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C-d Display Emacs ordering information.
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C-e Display info about Emacs problems.
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C-f Display the Emacs FAQ.
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C-m Display how to order printed Emacs manuals.
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C-n Display news of recent Emacs changes.
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C-p Display information about the GNU project.
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C-t Display the Emacs TODO list.
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C-w Display information on absence of warranty for GNU Emacs."
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help-map)
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(defun function-called-at-point ()
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"Return a function around point or else called by the list containing point.
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If that doesn't give a function, return nil."
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(with-syntax-table emacs-lisp-mode-syntax-table
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(or (condition-case ()
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(save-excursion
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(or (not (zerop (skip-syntax-backward "_w")))
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(eq (char-syntax (following-char)) ?w)
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(eq (char-syntax (following-char)) ?_)
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(forward-sexp -1))
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(skip-chars-forward "'")
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(let ((obj (read (current-buffer))))
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(and (symbolp obj) (fboundp obj) obj)))
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(error nil))
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(condition-case ()
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(save-excursion
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(save-restriction
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(narrow-to-region (max (point-min)
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(- (point) 1000)) (point-max))
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;; Move up to surrounding paren, then after the open.
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(backward-up-list 1)
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(forward-char 1)
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;; If there is space here, this is probably something
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;; other than a real Lisp function call, so ignore it.
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(if (looking-at "[ \t]")
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(error "Probably not a Lisp function call"))
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(let ((obj (read (current-buffer))))
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(and (symbolp obj) (fboundp obj) obj))))
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(error nil)))))
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;;; `User' help functions
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(defun describe-distribution ()
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"Display info on how to obtain the latest version of GNU Emacs."
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(interactive)
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(view-file (expand-file-name "DISTRIB" data-directory)))
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(defun describe-copying ()
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"Display info on how you may redistribute copies of GNU Emacs."
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(interactive)
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(view-file (expand-file-name "COPYING" data-directory))
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(goto-char (point-min)))
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(defun describe-project ()
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"Display info on the GNU project."
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(interactive)
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(view-file (expand-file-name "THE-GNU-PROJECT" data-directory))
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(goto-char (point-min)))
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(defun describe-no-warranty ()
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"Display info on all the kinds of warranty Emacs does NOT have."
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(interactive)
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(describe-copying)
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(let (case-fold-search)
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(search-forward "NO WARRANTY")
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(recenter 0)))
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(defun describe-prefix-bindings ()
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"Describe the bindings of the prefix used to reach this command.
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The prefix described consists of all but the last event
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of the key sequence that ran this command."
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(interactive)
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(let* ((key (this-command-keys)))
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(describe-bindings
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(if (stringp key)
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(substring key 0 (1- (length key)))
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(let ((prefix (make-vector (1- (length key)) nil))
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(i 0))
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(while (< i (length prefix))
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(aset prefix i (aref key i))
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(setq i (1+ i)))
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prefix)))))
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;; Make C-h after a prefix, when not specifically bound,
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;; run describe-prefix-bindings.
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(setq prefix-help-command 'describe-prefix-bindings)
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(defun view-emacs-news (&optional arg)
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"Display info on recent changes to Emacs.
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With numeric argument, display information on correspondingly older changes."
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(interactive "P")
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(let* ((arg (if arg (prefix-numeric-value arg) 0))
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(file (cond ((eq arg 0) "NEWS")
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((eq arg 1) "ONEWS")
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(t
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(nth (- arg 2)
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(nreverse (directory-files data-directory
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nil "^ONEWS\\.[0-9]+$"
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nil)))))))
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(if file
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(view-file (expand-file-name file data-directory))
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(error "No such old news"))))
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(defun view-todo (&optional arg)
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"Display the Emacs TODO list."
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(interactive "P")
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(view-file (expand-file-name "TODO" data-directory)))
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(defun view-echo-area-messages ()
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"View the log of recent echo-area messages: the `*Messages*' buffer.
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The number of messages retained in that buffer
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is specified by the variable `message-log-max'."
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(interactive)
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(switch-to-buffer (get-buffer-create "*Messages*")))
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(defun view-order-manuals ()
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"Display the Emacs ORDERS file."
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(interactive)
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(view-file (expand-file-name "ORDERS" data-directory))
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(goto-address))
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(defun view-emacs-FAQ ()
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"Display the Emacs Frequently Asked Questions (FAQ) file."
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(interactive)
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;; (find-file-read-only (expand-file-name "FAQ" data-directory))
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(info "(efaq)"))
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(defun view-emacs-problems ()
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"Display info on known problems with Emacs and possible workarounds."
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(interactive)
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(view-file (expand-file-name "PROBLEMS" data-directory)))
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(defun view-lossage ()
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"Display last 100 input keystrokes.
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To record all your input on a file, use `open-dribble-file'."
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(interactive)
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(help-setup-xref (list #'view-lossage) (interactive-p))
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(with-output-to-temp-buffer (help-buffer)
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(princ (mapconcat (lambda (key)
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(if (or (integerp key) (symbolp key) (listp key))
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(single-key-description key)
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(prin1-to-string key nil)))
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(recent-keys)
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" "))
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(with-current-buffer standard-output
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(goto-char (point-min))
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(while (progn (move-to-column 50) (not (eobp)))
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(search-forward " " nil t)
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(insert "\n")))
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(print-help-return-message)))
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;; Key bindings
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(defun describe-bindings (&optional prefix buffer)
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"Show a list of all defined keys, and their definitions.
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We put that list in a buffer, and display the buffer.
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The optional argument PREFIX, if non-nil, should be a key sequence;
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then we display only bindings that start with that prefix.
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The optional argument BUFFER specifies which buffer's bindings
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to display (default, the current buffer)."
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(interactive)
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(or buffer (setq buffer (current-buffer)))
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(help-setup-xref (list #'describe-bindings prefix buffer) (interactive-p))
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(with-current-buffer buffer
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(describe-bindings-internal nil prefix)))
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;; This function used to be in keymap.c.
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(defun describe-bindings-internal (&optional menus prefix)
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"Show a list of all defined keys, and their definitions.
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We put that list in a buffer, and display the buffer.
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The optional argument MENUS, if non-nil, says to mention menu bindings.
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\(Ordinarily these are omitted from the output.)
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The optional argument PREFIX, if non-nil, should be a key sequence;
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then we display only bindings that start with that prefix."
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(interactive)
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(let ((buf (current-buffer)))
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(with-output-to-temp-buffer "*Help*"
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(with-current-buffer standard-output
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(describe-buffer-bindings buf prefix menus)))))
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(defun where-is (definition &optional insert)
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"Print message listing key sequences that invoke the command DEFINITION.
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Argument is a command definition, usually a symbol with a function definition.
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If INSERT (the prefix arg) is non-nil, insert the message in the buffer."
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(interactive
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(let ((fn (function-called-at-point))
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(enable-recursive-minibuffers t)
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val)
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(setq val (completing-read
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(if fn
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(format "Where is command (default %s): " fn)
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"Where is command: ")
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obarray 'commandp t))
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(list (if (equal val "") fn (intern val)) current-prefix-arg)))
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(let ((func (indirect-function definition))
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(defs nil)
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(standard-output (if insert (current-buffer) t)))
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(mapatoms (lambda (symbol)
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(and (fboundp symbol)
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(not (eq symbol definition))
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(eq func (condition-case ()
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(indirect-function symbol)
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(error symbol)))
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(push symbol defs))))
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(princ (mapconcat
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#'(lambda (symbol)
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(let* ((remapped (command-remapping symbol))
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(keys (where-is-internal
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symbol overriding-local-map nil nil remapped))
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(keys (mapconcat 'key-description keys ", ")))
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(if insert
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(if (> (length keys) 0)
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(if remapped
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(format "%s (%s) (remapped from %s)"
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keys remapped symbol)
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(format "%s (%s)" keys symbol))
|
||
(format "M-x %s RET" symbol))
|
||
(if (> (length keys) 0)
|
||
(if remapped
|
||
(format "%s is remapped to %s which is on %s"
|
||
definition symbol keys)
|
||
(format "%s is on %s" symbol keys))
|
||
(format "%s is not on any key" symbol)))))
|
||
(cons definition defs)
|
||
";\nand ")))
|
||
nil)
|
||
|
||
(defun string-key-binding (key)
|
||
"Value is the binding of KEY in a string.
|
||
If KEY is an event on a string, and that string has a `local-map'
|
||
or `keymap' property, return the binding of KEY in the string's keymap."
|
||
(let* ((defn nil)
|
||
(start (when (vectorp key)
|
||
(if (memq (aref key 0)
|
||
'(mode-line header-line left-margin right-margin))
|
||
(event-start (aref key 1))
|
||
(and (consp (aref key 0))
|
||
(event-start (aref key 0))))))
|
||
(string-info (and (consp start) (nth 4 start))))
|
||
(when string-info
|
||
(let* ((string (car string-info))
|
||
(pos (cdr string-info))
|
||
(local-map (and (>= pos 0)
|
||
(< pos (length string))
|
||
(or (get-text-property pos 'local-map string)
|
||
(get-text-property pos 'keymap string)))))
|
||
(setq defn (and local-map (lookup-key local-map key)))))
|
||
defn))
|
||
|
||
(defun help-key-description (key untranslated)
|
||
(let ((string (key-description key)))
|
||
(if (or (not untranslated)
|
||
(and (eq (aref untranslated 0) ?\e) (not (eq (aref key 0) ?\e))))
|
||
string
|
||
(let ((otherstring (key-description untranslated)))
|
||
(if (equal string otherstring)
|
||
string
|
||
(format "%s (translated from %s)" string otherstring))))))
|
||
|
||
(defun describe-key-briefly (key &optional insert untranslated)
|
||
"Print the name of the function KEY invokes. KEY is a string.
|
||
If INSERT (the prefix arg) is non-nil, insert the message in the buffer.
|
||
If non-nil UNTRANSLATED is a vector of the untranslated events.
|
||
It can also be a number in which case the untranslated events from
|
||
the last key hit are used."
|
||
(interactive "kDescribe key briefly: \nP\np")
|
||
(if (numberp untranslated)
|
||
(setq untranslated (this-single-command-raw-keys)))
|
||
(save-excursion
|
||
(let ((modifiers (event-modifiers (aref key 0)))
|
||
(standard-output (if insert (current-buffer) t))
|
||
window position)
|
||
;; For a mouse button event, go to the button it applies to
|
||
;; to get the right key bindings. And go to the right place
|
||
;; in case the keymap depends on where you clicked.
|
||
(if (or (memq 'click modifiers) (memq 'down modifiers)
|
||
(memq 'drag modifiers))
|
||
(setq window (posn-window (event-start (aref key 0)))
|
||
position (posn-point (event-start (aref key 0)))))
|
||
(if (windowp window)
|
||
(progn
|
||
(set-buffer (window-buffer window))
|
||
(goto-char position)))
|
||
;; Ok, now look up the key and name the command.
|
||
(let ((defn (or (string-key-binding key)
|
||
(key-binding key)))
|
||
(key-desc (help-key-description key untranslated)))
|
||
(if (or (null defn) (integerp defn) (equal defn 'undefined))
|
||
(princ (format "%s is undefined" key-desc))
|
||
(princ (format (if (windowp window)
|
||
"%s at that spot runs the command %s"
|
||
"%s runs the command %s")
|
||
key-desc
|
||
(if (symbolp defn) defn (prin1-to-string defn)))))))))
|
||
|
||
|
||
(defun describe-key (key &optional untranslated)
|
||
"Display documentation of the function invoked by KEY.
|
||
KEY should be a key sequence--when calling from a program,
|
||
pass a string or a vector.
|
||
If non-nil UNTRANSLATED is a vector of the untranslated events.
|
||
It can also be a number in which case the untranslated events from
|
||
the last key hit are used."
|
||
(interactive "kDescribe key: \np")
|
||
(if (numberp untranslated)
|
||
(setq untranslated (this-single-command-raw-keys)))
|
||
(save-excursion
|
||
(let ((modifiers (event-modifiers (aref key 0)))
|
||
window position)
|
||
;; For a mouse button event, go to the button it applies to
|
||
;; to get the right key bindings. And go to the right place
|
||
;; in case the keymap depends on where you clicked.
|
||
(if (or (memq 'click modifiers) (memq 'down modifiers)
|
||
(memq 'drag modifiers))
|
||
(setq window (posn-window (event-start (aref key 0)))
|
||
position (posn-point (event-start (aref key 0)))))
|
||
(when (windowp window)
|
||
(set-buffer (window-buffer window))
|
||
(goto-char position))
|
||
(let ((defn (or (string-key-binding key) (key-binding key))))
|
||
(if (or (null defn) (integerp defn) (equal defn 'undefined))
|
||
(message "%s is undefined" (help-key-description key untranslated))
|
||
(help-setup-xref (list #'describe-function defn) (interactive-p))
|
||
(with-output-to-temp-buffer (help-buffer)
|
||
(princ (help-key-description key untranslated))
|
||
(if (windowp window)
|
||
(princ " at that spot"))
|
||
(princ " runs the command ")
|
||
(prin1 defn)
|
||
(princ "\n which is ")
|
||
(describe-function-1 defn)
|
||
(print-help-return-message)))))))
|
||
|
||
|
||
(defun describe-mode (&optional buffer)
|
||
"Display documentation of current major mode and minor modes.
|
||
The major mode description comes first, followed by the minor modes,
|
||
each on a separate page.
|
||
For this to work correctly for a minor mode, the mode's indicator variable
|
||
\(listed in `minor-mode-alist') must also be a function whose documentation
|
||
describes the minor mode."
|
||
(interactive)
|
||
(help-setup-xref (list #'describe-mode (or buffer (current-buffer)))
|
||
(interactive-p))
|
||
;; For the sake of help-do-xref and help-xref-go-back,
|
||
;; don't switch buffers before calling `help-buffer'.
|
||
(with-output-to-temp-buffer (help-buffer)
|
||
(save-excursion
|
||
(when buffer (set-buffer buffer))
|
||
(when minor-mode-alist
|
||
(princ "The major mode is described first.
|
||
For minor modes, see following pages.\n\n"))
|
||
(princ mode-name)
|
||
(princ " mode:\n")
|
||
(princ (documentation major-mode))
|
||
(let ((minor-modes minor-mode-alist))
|
||
(while minor-modes
|
||
(let* ((minor-mode (car (car minor-modes)))
|
||
(indicator (car (cdr (car minor-modes)))))
|
||
;; Document a minor mode if it is listed in minor-mode-alist,
|
||
;; bound locally in this buffer, non-nil, and has a function
|
||
;; definition.
|
||
(if (and (boundp minor-mode)
|
||
(symbol-value minor-mode)
|
||
(fboundp minor-mode))
|
||
(let ((pretty-minor-mode minor-mode))
|
||
(if (string-match "\\(-minor\\)?-mode\\'"
|
||
(symbol-name minor-mode))
|
||
(setq pretty-minor-mode
|
||
(capitalize
|
||
(substring (symbol-name minor-mode)
|
||
0 (match-beginning 0)))))
|
||
(while (and indicator (symbolp indicator)
|
||
(boundp indicator)
|
||
(not (eq indicator (symbol-value indicator))))
|
||
(setq indicator (symbol-value indicator)))
|
||
(princ "\n\f\n")
|
||
(princ (format "%s minor mode (%s):\n"
|
||
pretty-minor-mode
|
||
(if indicator
|
||
(format "indicator%s" indicator)
|
||
"no indicator")))
|
||
(princ (documentation minor-mode)))))
|
||
(setq minor-modes (cdr minor-modes))))
|
||
(print-help-return-message))))
|
||
|
||
(defun describe-minor-mode (minor-mode)
|
||
"Display documentation of a minor mode given as MINOR-MODE.
|
||
MINOR-MODE can be a minor mode symbol or a minor mode indicator string
|
||
appeared on the mode-line."
|
||
(interactive (list (completing-read
|
||
"Minor mode: "
|
||
(nconc
|
||
(describe-minor-mode-completion-table-for-symbol)
|
||
(describe-minor-mode-completion-table-for-indicator)
|
||
))))
|
||
(if (symbolp minor-mode)
|
||
(setq minor-mode (symbol-name minor-mode)))
|
||
(let ((symbols (describe-minor-mode-completion-table-for-symbol))
|
||
(indicators (describe-minor-mode-completion-table-for-indicator)))
|
||
(cond
|
||
((member minor-mode symbols)
|
||
(describe-minor-mode-from-symbol (intern minor-mode)))
|
||
((member minor-mode indicators)
|
||
(describe-minor-mode-from-indicator minor-mode))
|
||
(t
|
||
(error "No such minor mode: %s" minor-mode)))))
|
||
|
||
;; symbol
|
||
(defun describe-minor-mode-completion-table-for-symbol ()
|
||
;; In order to list up all minor modes, minor-mode-list
|
||
;; is used here instead of minor-mode-alist.
|
||
(delq nil (mapcar 'symbol-name minor-mode-list)))
|
||
(defun describe-minor-mode-from-symbol (symbol)
|
||
"Display documentation of a minor mode given as a symbol, SYMBOL"
|
||
(interactive (list (intern (completing-read
|
||
"Minor mode symbol: "
|
||
(describe-minor-mode-completion-table-for-symbol)))))
|
||
(if (fboundp symbol)
|
||
(describe-function symbol)
|
||
(describe-variable symbol)))
|
||
|
||
;; indicator
|
||
(defun describe-minor-mode-completion-table-for-indicator ()
|
||
(delq nil
|
||
(mapcar (lambda (x)
|
||
(let ((i (format-mode-line x)))
|
||
;; remove first space if existed
|
||
(cond
|
||
((= 0 (length i))
|
||
nil)
|
||
((eq (aref i 0) ?\ )
|
||
(substring i 1))
|
||
(t
|
||
i))))
|
||
minor-mode-alist)))
|
||
(defun describe-minor-mode-from-indicator (indicator)
|
||
"Display documentation of a minor mode specified by INDICATOR.
|
||
If you call this function interactively, you can give indicator which
|
||
is currently activated with completion."
|
||
(interactive (list
|
||
(completing-read
|
||
"Minor mode indicator: "
|
||
(describe-minor-mode-completion-table-for-indicator))))
|
||
(let ((minor-mode (lookup-minor-mode-from-indicator indicator)))
|
||
(if minor-mode
|
||
(describe-minor-mode-from-symbol minor-mode)
|
||
(error "Cannot find minor mode for `%s'" indicator))))
|
||
|
||
(defun lookup-minor-mode-from-indicator (indicator)
|
||
"Return a minor mode symbol from its indicator on the modeline."
|
||
;; remove first space if existed
|
||
(if (and (< 0 (length indicator))
|
||
(eq (aref indicator 0) ?\ ))
|
||
(setq indicator (substring indicator 1)))
|
||
(let ((minor-modes minor-mode-alist)
|
||
result)
|
||
(while minor-modes
|
||
(let* ((minor-mode (car (car minor-modes)))
|
||
(anindicator (format-mode-line
|
||
(car (cdr (car minor-modes))))))
|
||
;; remove first space if existed
|
||
(if (and (stringp anindicator)
|
||
(> (length anindicator) 0)
|
||
(eq (aref anindicator 0) ?\ ))
|
||
(setq anindicator (substring anindicator 1)))
|
||
(if (equal indicator anindicator)
|
||
(setq result minor-mode
|
||
minor-modes nil)
|
||
(setq minor-modes (cdr minor-modes)))))
|
||
result))
|
||
|
||
|
||
;;; Automatic resizing of temporary buffers.
|
||
|
||
(defcustom temp-buffer-max-height (lambda (buffer) (/ (- (frame-height) 2) 2))
|
||
"*Maximum height of a window displaying a temporary buffer.
|
||
This is the maximum height (in text lines) which `resize-temp-buffer-window'
|
||
will give to a window displaying a temporary buffer.
|
||
It can also be a function which will be called with the object corresponding
|
||
to the buffer to be displayed as argument and should return an integer
|
||
positive number."
|
||
:type '(choice integer function)
|
||
:group 'help
|
||
:version "20.4")
|
||
|
||
(define-minor-mode temp-buffer-resize-mode
|
||
"Toggle the mode which makes windows smaller for temporary buffers.
|
||
With prefix argument ARG, turn the resizing of windows displaying temporary
|
||
buffers on if ARG is positive or off otherwise.
|
||
This makes the window the right height for its contents, but never
|
||
more than `temp-buffer-max-height' nor less than `window-min-height'.
|
||
This applies to `help', `apropos' and `completion' buffers, and some others."
|
||
:global t :group 'help
|
||
(if temp-buffer-resize-mode
|
||
;; `help-make-xrefs' may add a `back' button and thus increase the
|
||
;; text size, so `resize-temp-buffer-window' must be run *after* it.
|
||
(add-hook 'temp-buffer-show-hook 'resize-temp-buffer-window 'append)
|
||
(remove-hook 'temp-buffer-show-hook 'resize-temp-buffer-window)))
|
||
|
||
(defun resize-temp-buffer-window ()
|
||
"Resize the current window to fit its contents.
|
||
Will not make it higher than `temp-buffer-max-height' nor smaller than
|
||
`window-min-height'. Do nothing if it is the only window on its frame, if it
|
||
is not as wide as the frame or if some of the window's contents are scrolled
|
||
out of view."
|
||
(unless (or (one-window-p 'nomini)
|
||
(not (pos-visible-in-window-p (point-min)))
|
||
(/= (frame-width) (window-width)))
|
||
(fit-window-to-buffer
|
||
(selected-window)
|
||
(if (functionp temp-buffer-max-height)
|
||
(funcall temp-buffer-max-height (current-buffer))
|
||
temp-buffer-max-height))))
|
||
|
||
;; Provide this for the sake of define-minor-mode which generates
|
||
;; defcustoms which require 'help'.
|
||
(provide 'help)
|
||
|
||
;;; help.el ends here
|