2001-11-26 19:52:07 +00:00
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;;; help-fns.el --- Complex help functions
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2001-10-09 11:15:19 +00:00
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2004-04-07 19:38:54 +00:00
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;; Copyright (C) 1985, 86, 93, 94, 98, 1999, 2000, 01, 02, 03, 2004
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2001-10-09 11:15:19 +00:00
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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 file contains those help commands which are complicated, and
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;; which may not be used in every session. For example
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;; `describe-function' will probably be heavily used when doing elisp
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;; programming, but not if just editing C files. Simpler help commands
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;; are in help.el
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;;; Code:
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2001-10-11 23:34:07 +00:00
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(require 'help-mode)
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2001-10-09 11:15:19 +00:00
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;;;###autoload
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(defun help-with-tutorial (&optional arg)
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"Select the Emacs learn-by-doing tutorial.
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If there is a tutorial version written in the language
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of the selected language environment, that version is used.
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If there's no tutorial in that language, `TUTORIAL' is selected.
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2002-09-27 22:59:41 +00:00
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With ARG, you are asked to choose which language."
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2001-10-09 11:15:19 +00:00
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(interactive "P")
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(let ((lang (if arg
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2004-05-09 00:45:49 +00:00
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(let ((minibuffer-setup-hook minibuffer-setup-hook))
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(add-hook 'minibuffer-setup-hook
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'minibuffer-completion-help)
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(read-language-name 'tutorial "Language: " "English"))
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2001-10-09 11:15:19 +00:00
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(if (get-language-info current-language-environment 'tutorial)
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current-language-environment
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"English")))
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file filename)
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(setq filename (get-language-info lang 'tutorial))
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(setq file (expand-file-name (concat "~/" filename)))
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(delete-other-windows)
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(if (get-file-buffer file)
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(switch-to-buffer (get-file-buffer file))
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(switch-to-buffer (create-file-buffer file))
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(setq buffer-file-name file)
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(setq default-directory (expand-file-name "~/"))
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(setq buffer-auto-save-file-name nil)
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(insert-file-contents (expand-file-name filename data-directory))
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2004-04-18 22:12:23 +00:00
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(hack-local-variables)
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2001-10-09 11:15:19 +00:00
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(goto-char (point-min))
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(search-forward "\n<<")
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(beginning-of-line)
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2002-04-01 12:32:02 +00:00
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;; Convert the <<...>> line to the proper [...] line,
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;; or just delete the <<...>> line if a [...] line follows.
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(cond ((save-excursion
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(forward-line 1)
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(looking-at "\\["))
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(delete-region (point) (progn (forward-line 1) (point))))
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((looking-at "<<Blank lines inserted.*>>")
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(replace-match "[Middle of page left blank for didactic purposes. Text continues below]"))
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(t
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(looking-at "<<")
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(replace-match "[")
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(search-forward ">>")
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(replace-match "]")))
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(beginning-of-line)
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2001-10-09 11:15:19 +00:00
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(let ((n (- (window-height (selected-window))
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(count-lines (point-min) (point))
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6)))
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2002-04-01 12:32:02 +00:00
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(if (< n 8)
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(progn
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;; For a short gap, we don't need the [...] line,
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;; so delete it.
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(delete-region (point) (progn (end-of-line) (point)))
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(newline n))
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2001-10-09 11:15:19 +00:00
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;; Some people get confused by the large gap.
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(newline (/ n 2))
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2003-02-04 11:26:42 +00:00
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2002-04-01 12:32:02 +00:00
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;; Skip the [...] line (don't delete it).
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(forward-line 1)
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2001-10-09 11:15:19 +00:00
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(newline (- n (/ n 2)))))
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(goto-char (point-min))
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2005-02-03 19:42:19 +00:00
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(setq buffer-undo-list nil)
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2001-10-09 11:15:19 +00:00
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(set-buffer-modified-p nil))))
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;;;###autoload
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(defun locate-library (library &optional nosuffix path interactive-call)
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"Show the precise file name of Emacs library LIBRARY.
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2002-08-15 01:38:45 +00:00
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This command searches the directories in `load-path' like `\\[load-library]'
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to find the file that `\\[load-library] RET LIBRARY RET' would load.
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2001-10-12 21:00:54 +00:00
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Optional second arg NOSUFFIX non-nil means don't add suffixes `load-suffixes'
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2001-10-09 11:15:19 +00:00
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to the specified name LIBRARY.
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If the optional third arg PATH is specified, that list of directories
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is used instead of `load-path'.
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When called from a program, the file name is normaly returned as a
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string. When run interactively, the argument INTERACTIVE-CALL is t,
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and the file name is displayed in the echo area."
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2002-08-15 01:38:45 +00:00
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(interactive (list (completing-read "Locate library: "
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'locate-file-completion
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(cons load-path load-suffixes))
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2001-10-09 11:15:19 +00:00
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nil nil
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t))
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2002-08-15 01:38:45 +00:00
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(let ((file (locate-file library
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(or path load-path)
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(append (unless nosuffix load-suffixes) '("")))))
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2001-10-12 21:00:54 +00:00
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(if interactive-call
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2002-08-15 01:38:45 +00:00
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(if file
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(message "Library is file %s" (abbreviate-file-name file))
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(message "No library %s in search path" library)))
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file))
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2001-10-09 11:15:19 +00:00
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;; Functions
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;;;###autoload
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(defun describe-function (function)
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"Display the full documentation of FUNCTION (a symbol)."
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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 (if fn
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(format "Describe function (default %s): " fn)
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"Describe function: ")
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obarray 'fboundp t nil nil (symbol-name fn)))
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(list (if (equal val "")
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fn (intern val)))))
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(if (null function)
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(message "You didn't specify a function")
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2001-10-11 23:34:07 +00:00
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(help-setup-xref (list #'describe-function function) (interactive-p))
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2002-01-07 05:20:40 +00:00
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(save-excursion
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(with-output-to-temp-buffer (help-buffer)
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(prin1 function)
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;; Use " is " instead of a colon so that
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;; it is easier to get out the function name using forward-sexp.
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(princ " is ")
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(describe-function-1 function)
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(print-help-return-message)
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(with-current-buffer standard-output
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;; Return the text we displayed.
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(buffer-string))))))
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2001-10-09 11:15:19 +00:00
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2004-05-11 23:50:25 +00:00
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(defun help-split-fundoc (docstring def)
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"Split a function DOCSTRING into the actual doc and the usage info.
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2002-08-19 21:23:08 +00:00
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Return (USAGE . DOC) or nil if there's no usage info.
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2004-05-11 23:50:25 +00:00
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DEF is the function whose usage we're looking for in DOCSTRING."
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2002-08-19 21:23:08 +00:00
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;; Functions can get the calling sequence at the end of the doc string.
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2002-07-16 16:24:59 +00:00
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;; In cases where `function' has been fset to a subr we can't search for
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2002-08-19 21:23:08 +00:00
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;; function's name in the doc string so we use `fn' as the anonymous
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;; function name instead.
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2004-05-11 23:50:25 +00:00
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(when (and docstring (string-match "\n\n(fn\\(\\( .*\\)?)\\)\\'" docstring))
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2002-09-27 22:59:41 +00:00
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(cons (format "(%s%s"
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;; Replace `fn' with the actual function name.
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(if (consp def) "anonymous" def)
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2004-05-11 23:50:25 +00:00
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(match-string 1 docstring))
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(substring docstring 0 (match-beginning 0)))))
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2002-09-27 22:59:41 +00:00
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2004-05-11 23:50:25 +00:00
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(defun help-add-fundoc-usage (docstring arglist)
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"Add the usage info to DOCSTRING.
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If DOCSTRING already has a usage info, then just return it unchanged.
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The usage info is built from ARGLIST. DOCSTRING can be nil.
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ARGLIST can also be t or a string of the form \"(FUN ARG1 ARG2 ...)\"."
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(unless (stringp docstring) (setq docstring "Not documented"))
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(if (or (string-match "\n\n(fn\\(\\( .*\\)?)\\)\\'" docstring) (eq arglist t))
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docstring
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2004-05-22 01:58:25 +00:00
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(concat docstring
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2004-05-11 23:50:25 +00:00
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(if (string-match "\n?\n\\'" docstring)
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2003-04-12 04:28:43 +00:00
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(if (< (- (match-end 0) (match-beginning 0)) 2) "\n" "")
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2002-09-27 22:59:41 +00:00
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"\n\n")
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2003-05-04 00:30:34 +00:00
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(if (and (stringp arglist)
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(string-match "\\`([^ ]+\\(.*\\))\\'" arglist))
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(concat "(fn" (match-string 1 arglist) ")")
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2004-05-22 01:58:25 +00:00
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(format "%S" (help-make-usage 'fn arglist))))))
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2002-07-16 16:24:59 +00:00
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(defun help-function-arglist (def)
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2002-08-15 01:38:45 +00:00
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;; Handle symbols aliased to other symbols.
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(if (and (symbolp def) (fboundp def)) (setq def (indirect-function def)))
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;; If definition is a macro, find the function inside it.
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(if (eq (car-safe def) 'macro) (setq def (cdr def)))
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2002-07-16 16:24:59 +00:00
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(cond
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((byte-code-function-p def) (aref def 0))
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((eq (car-safe def) 'lambda) (nth 1 def))
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((and (eq (car-safe def) 'autoload) (not (eq (nth 4 def) 'keymap)))
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"[Arg list not available until function definition is loaded.]")
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(t t)))
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(defun help-make-usage (function arglist)
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(cons (if (symbolp function) function 'anonymous)
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(mapcar (lambda (arg)
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2002-08-19 21:23:08 +00:00
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(if (not (symbolp arg))
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(if (and (consp arg) (symbolp (car arg)))
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;; CL style default values for optional args.
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(cons (intern (upcase (symbol-name (car arg))))
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(cdr arg))
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arg)
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2002-07-16 16:24:59 +00:00
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(let ((name (symbol-name arg)))
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(if (string-match "\\`&" name) arg
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(intern (upcase name))))))
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arglist)))
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2005-01-07 16:12:34 +00:00
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;;; Could be this, if we make symbol-file do the work below.
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;;; (defun help-C-file-name (subr-or-var kind)
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;;; "Return the name of the C file where SUBR-OR-VAR is defined.
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;;; KIND should be `var' for a variable or `subr' for a subroutine."
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;;; (symbol-file (if (symbolp subr-or-var) subr-or-var
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;;; (subr-name subr-or-var))
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;;; (if (eq kind 'var) 'defvar 'defun)))
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2004-04-07 19:38:54 +00:00
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(defun help-C-file-name (subr-or-var kind)
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"Return the name of the C file where SUBR-OR-VAR is defined.
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KIND should be `var' for a variable or `subr' for a subroutine."
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(let ((docbuf (get-buffer-create " *DOC*"))
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(name (if (eq 'var kind)
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(concat "V" (symbol-name subr-or-var))
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2004-04-29 18:46:13 +00:00
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(concat "F" (subr-name subr-or-var)))))
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2004-04-07 19:38:54 +00:00
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(with-current-buffer docbuf
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(goto-char (point-min))
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(if (eobp)
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(insert-file-contents-literally
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(expand-file-name internal-doc-file-name doc-directory)))
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2004-11-09 08:20:44 +00:00
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(let ((file (catch 'loop
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(while t
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(let ((pnt (search-forward (concat "" name "\n"))))
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2005-01-07 16:12:34 +00:00
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(re-search-backward "S\\(.*\\)")
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(let ((file (match-string 1)))
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2004-11-09 08:20:44 +00:00
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(if (member file build-files)
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(throw 'loop file)
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(goto-char pnt))))))))
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2004-04-07 19:38:54 +00:00
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(if (string-match "\\.\\(o\\|obj\\)\\'" file)
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2004-04-29 18:46:13 +00:00
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(setq file (replace-match ".c" t t file)))
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(if (string-match "\\.c\\'" file)
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(concat "src/" file)
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2004-04-07 19:38:54 +00:00
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file)))))
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2004-06-04 23:26:14 +00:00
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;;;###autoload
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2004-06-06 21:44:22 +00:00
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(defface help-argument-name '((((supports :slant italic)) :inherit italic))
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2004-06-06 02:49:56 +00:00
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"Face to highlight argument names in *Help* buffers."
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:group 'help)
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2004-06-04 23:26:14 +00:00
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2004-05-13 01:18:00 +00:00
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(defun help-default-arg-highlight (arg)
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"Default function to highlight arguments in *Help* buffers.
|
2004-06-04 23:26:14 +00:00
|
|
|
|
It returns ARG in face `help-argument-name'; ARG is also
|
|
|
|
|
downcased if it displays differently than the default
|
|
|
|
|
face (according to `face-differs-from-default-p')."
|
|
|
|
|
(propertize (if (face-differs-from-default-p 'help-argument-name)
|
|
|
|
|
(downcase arg)
|
|
|
|
|
arg)
|
|
|
|
|
'face 'help-argument-name))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
|
|
|
|
|
(defun help-do-arg-highlight (doc args)
|
2004-05-07 22:41:22 +00:00
|
|
|
|
(with-syntax-table (make-syntax-table emacs-lisp-mode-syntax-table)
|
|
|
|
|
(modify-syntax-entry ?\- "w")
|
|
|
|
|
(while args
|
|
|
|
|
(let ((arg (prog1 (car args) (setq args (cdr args)))))
|
|
|
|
|
(setq doc (replace-regexp-in-string
|
2004-05-11 23:50:25 +00:00
|
|
|
|
;; This is heuristic, but covers all common cases
|
|
|
|
|
;; except ARG1-ARG2
|
|
|
|
|
(concat "\\<" ; beginning of word
|
|
|
|
|
"\\(?:[a-z-]+-\\)?" ; for xxx-ARG
|
|
|
|
|
"\\("
|
|
|
|
|
arg
|
|
|
|
|
"\\)"
|
|
|
|
|
"\\(?:es\\|s\\|th\\)?" ; for ARGth, ARGs
|
|
|
|
|
"\\(?:-[a-z-]+\\)?" ; for ARG-xxx
|
|
|
|
|
"\\>") ; end of word
|
2004-05-13 01:18:00 +00:00
|
|
|
|
(help-default-arg-highlight arg)
|
2004-05-07 22:41:22 +00:00
|
|
|
|
doc t t 1))))
|
|
|
|
|
doc))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
|
|
|
|
|
(defun help-highlight-arguments (usage doc &rest args)
|
|
|
|
|
(when usage
|
2004-05-09 00:45:49 +00:00
|
|
|
|
(with-temp-buffer
|
|
|
|
|
(insert usage)
|
|
|
|
|
(goto-char (point-min))
|
|
|
|
|
(let ((case-fold-search nil)
|
|
|
|
|
(next (not (or args (looking-at "\\["))))
|
|
|
|
|
(opt nil))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
;; Make a list of all arguments
|
2004-05-22 01:58:25 +00:00
|
|
|
|
(skip-chars-forward "^ ")
|
2004-05-04 00:22:29 +00:00
|
|
|
|
(while next
|
2004-05-07 22:41:22 +00:00
|
|
|
|
(or opt (not (looking-at " &")) (setq opt t))
|
2004-05-09 00:45:49 +00:00
|
|
|
|
(if (not (re-search-forward " \\([\\[(]*\\)\\([^] &)\.]+\\)" nil t))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
(setq next nil)
|
|
|
|
|
(setq args (cons (match-string 2) args))
|
2004-05-07 22:41:22 +00:00
|
|
|
|
(when (and opt (string= (match-string 1) "("))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
;; A pesky CL-style optional argument with default value,
|
|
|
|
|
;; so let's skip over it
|
|
|
|
|
(search-backward "(")
|
|
|
|
|
(goto-char (scan-sexps (point) 1)))))
|
|
|
|
|
;; Highlight aguments in the USAGE string
|
2004-05-09 01:28:34 +00:00
|
|
|
|
(setq usage (help-do-arg-highlight (buffer-string) args))
|
|
|
|
|
;; Highlight arguments in the DOC string
|
2004-05-09 22:41:34 +00:00
|
|
|
|
(setq doc (and doc (help-do-arg-highlight doc args))))))
|
|
|
|
|
;; Return value is like the one from help-split-fundoc, but highlighted
|
|
|
|
|
(cons usage doc))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
|
2001-10-11 23:34:07 +00:00
|
|
|
|
;;;###autoload
|
|
|
|
|
(defun describe-function-1 (function)
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(let* ((def (if (symbolp function)
|
|
|
|
|
(symbol-function function)
|
|
|
|
|
function))
|
2001-10-11 23:34:07 +00:00
|
|
|
|
file-name string
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(beg (if (commandp def) "an interactive " "a ")))
|
|
|
|
|
(setq string
|
|
|
|
|
(cond ((or (stringp def)
|
|
|
|
|
(vectorp def))
|
|
|
|
|
"a keyboard macro")
|
|
|
|
|
((subrp def)
|
|
|
|
|
(if (eq 'unevalled (cdr (subr-arity def)))
|
|
|
|
|
(concat beg "special form")
|
|
|
|
|
(concat beg "built-in function")))
|
|
|
|
|
((byte-code-function-p def)
|
|
|
|
|
(concat beg "compiled Lisp function"))
|
|
|
|
|
((symbolp def)
|
|
|
|
|
(while (symbolp (symbol-function def))
|
|
|
|
|
(setq def (symbol-function def)))
|
|
|
|
|
(format "an alias for `%s'" def))
|
|
|
|
|
((eq (car-safe def) 'lambda)
|
|
|
|
|
(concat beg "Lisp function"))
|
|
|
|
|
((eq (car-safe def) 'macro)
|
|
|
|
|
"a Lisp macro")
|
|
|
|
|
((eq (car-safe def) 'autoload)
|
|
|
|
|
(setq file-name (nth 1 def))
|
|
|
|
|
(format "%s autoloaded %s"
|
|
|
|
|
(if (commandp def) "an interactive" "an")
|
|
|
|
|
(if (eq (nth 4 def) 'keymap) "keymap"
|
|
|
|
|
(if (nth 4 def) "Lisp macro" "Lisp function"))
|
|
|
|
|
))
|
2002-08-15 01:38:45 +00:00
|
|
|
|
((keymapp def)
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(let ((is-full nil)
|
|
|
|
|
(elts (cdr-safe def)))
|
|
|
|
|
(while elts
|
|
|
|
|
(if (char-table-p (car-safe elts))
|
|
|
|
|
(setq is-full t
|
|
|
|
|
elts nil))
|
|
|
|
|
(setq elts (cdr-safe elts)))
|
|
|
|
|
(if is-full
|
|
|
|
|
"a full keymap"
|
|
|
|
|
"a sparse keymap")))
|
|
|
|
|
(t "")))
|
|
|
|
|
(princ string)
|
2001-10-11 23:34:07 +00:00
|
|
|
|
(with-current-buffer standard-output
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(save-excursion
|
|
|
|
|
(save-match-data
|
|
|
|
|
(if (re-search-backward "alias for `\\([^`']+\\)'" nil t)
|
|
|
|
|
(help-xref-button 1 'help-function def)))))
|
|
|
|
|
(or file-name
|
2004-12-27 16:24:20 +00:00
|
|
|
|
(setq file-name (symbol-file function 'defun)))
|
2002-05-08 18:05:28 +00:00
|
|
|
|
(when (equal file-name "loaddefs.el")
|
|
|
|
|
;; Find the real def site of the preloaded function.
|
|
|
|
|
;; This is necessary only for defaliases.
|
|
|
|
|
(let ((location
|
|
|
|
|
(condition-case nil
|
2002-06-23 21:02:45 +00:00
|
|
|
|
(find-function-search-for-symbol function nil "loaddefs.el")
|
2002-05-08 18:05:28 +00:00
|
|
|
|
(error nil))))
|
|
|
|
|
(when location
|
|
|
|
|
(with-current-buffer (car location)
|
|
|
|
|
(goto-char (cdr location))
|
|
|
|
|
(when (re-search-backward
|
|
|
|
|
"^;;; Generated autoloads from \\(.*\\)" nil t)
|
|
|
|
|
(setq file-name (match-string 1)))))))
|
2004-04-29 18:46:13 +00:00
|
|
|
|
(when (and (null file-name) (subrp def))
|
2004-04-07 19:38:54 +00:00
|
|
|
|
;; Find the C source file name.
|
2004-04-29 18:46:13 +00:00
|
|
|
|
(setq file-name (if (get-buffer " *DOC*")
|
|
|
|
|
(help-C-file-name def 'subr)
|
|
|
|
|
'C-source)))
|
2004-04-07 19:38:54 +00:00
|
|
|
|
(when file-name
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(princ " in `")
|
|
|
|
|
;; We used to add .el to the file name,
|
|
|
|
|
;; but that's completely wrong when the user used load-file.
|
2004-04-29 18:46:13 +00:00
|
|
|
|
(princ (if (eq file-name 'C-source) "C source code" file-name))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(princ "'")
|
|
|
|
|
;; Make a hyperlink to the library.
|
2001-10-11 23:34:07 +00:00
|
|
|
|
(with-current-buffer standard-output
|
2004-04-07 19:38:54 +00:00
|
|
|
|
(save-excursion
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(re-search-backward "`\\([^`']+\\)'" nil t)
|
2004-04-07 19:38:54 +00:00
|
|
|
|
(help-xref-button 1 'help-function-def function file-name))))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(princ ".")
|
|
|
|
|
(terpri)
|
|
|
|
|
(when (commandp function)
|
2003-02-12 23:13:43 +00:00
|
|
|
|
(let* ((remapped (command-remapping function))
|
2002-02-06 23:05:03 +00:00
|
|
|
|
(keys (where-is-internal
|
2004-04-20 20:51:11 +00:00
|
|
|
|
(or remapped function) overriding-local-map nil nil))
|
|
|
|
|
non-modified-keys)
|
|
|
|
|
;; Which non-control non-meta keys run this command?
|
|
|
|
|
(dolist (key keys)
|
|
|
|
|
(if (member (event-modifiers (aref key 0)) '(nil (shift)))
|
|
|
|
|
(push key non-modified-keys)))
|
2002-02-06 23:05:03 +00:00
|
|
|
|
(when remapped
|
|
|
|
|
(princ "It is remapped to `")
|
|
|
|
|
(princ (symbol-name remapped))
|
|
|
|
|
(princ "'"))
|
2004-04-20 20:51:11 +00:00
|
|
|
|
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(when keys
|
2002-02-06 23:05:03 +00:00
|
|
|
|
(princ (if remapped " which is bound to " "It is bound to "))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
;; FIXME: This list can be very long (f.ex. for self-insert-command).
|
2004-04-20 20:51:11 +00:00
|
|
|
|
;; If there are many, remove them from KEYS.
|
|
|
|
|
(if (< (length non-modified-keys) 10)
|
2004-05-01 13:55:16 +00:00
|
|
|
|
(princ (mapconcat 'key-description keys ", "))
|
2004-04-20 20:51:11 +00:00
|
|
|
|
(dolist (key non-modified-keys)
|
|
|
|
|
(setq keys (delq key keys)))
|
|
|
|
|
(if keys
|
|
|
|
|
(progn
|
|
|
|
|
(princ (mapconcat 'key-description keys ", "))
|
|
|
|
|
(princ ", and many ordinary text characters"))
|
|
|
|
|
(princ "many ordinary text characters"))))
|
|
|
|
|
(when (or remapped keys non-modified-keys)
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(princ ".")
|
|
|
|
|
(terpri))))
|
2002-07-16 16:24:59 +00:00
|
|
|
|
(let* ((arglist (help-function-arglist def))
|
|
|
|
|
(doc (documentation function))
|
2002-08-19 21:23:08 +00:00
|
|
|
|
(usage (help-split-fundoc doc function)))
|
2004-05-04 00:22:29 +00:00
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
;; If definition is a keymap, skip arglist note.
|
|
|
|
|
(unless (keymapp def)
|
|
|
|
|
(let* ((use (cond
|
|
|
|
|
(usage (setq doc (cdr usage)) (car usage))
|
|
|
|
|
((listp arglist)
|
|
|
|
|
(format "%S" (help-make-usage function arglist)))
|
|
|
|
|
((stringp arglist) arglist)
|
|
|
|
|
;; Maybe the arglist is in the docstring of the alias.
|
|
|
|
|
((let ((fun function))
|
|
|
|
|
(while (and (symbolp fun)
|
|
|
|
|
(setq fun (symbol-function fun))
|
|
|
|
|
(not (setq usage (help-split-fundoc
|
|
|
|
|
(documentation fun)
|
|
|
|
|
function)))))
|
|
|
|
|
usage)
|
|
|
|
|
(car usage))
|
|
|
|
|
((or (stringp def)
|
|
|
|
|
(vectorp def))
|
|
|
|
|
(format "\nMacro: %s" (format-kbd-macro def)))
|
|
|
|
|
(t "[Missing arglist. Please make a bug report.]")))
|
|
|
|
|
(high (help-highlight-arguments use doc)))
|
|
|
|
|
(insert (car high) "\n")
|
|
|
|
|
(setq doc (cdr high))))
|
|
|
|
|
(let ((obsolete (and
|
|
|
|
|
;; function might be a lambda construct.
|
|
|
|
|
(symbolp function)
|
|
|
|
|
(get function 'byte-obsolete-info))))
|
|
|
|
|
(when obsolete
|
|
|
|
|
(princ "\nThis function is obsolete")
|
|
|
|
|
(when (nth 2 obsolete)
|
|
|
|
|
(insert (format " since %s" (nth 2 obsolete))))
|
|
|
|
|
(insert ";\n"
|
|
|
|
|
(if (stringp (car obsolete)) (car obsolete)
|
|
|
|
|
(format "use `%s' instead." (car obsolete)))
|
|
|
|
|
"\n"))
|
|
|
|
|
(insert "\n"
|
|
|
|
|
(or doc "Not documented.")))))))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; Variables
|
|
|
|
|
|
|
|
|
|
;;;###autoload
|
2005-01-05 01:09:23 +00:00
|
|
|
|
(defun variable-at-point (&optional any-symbol)
|
2001-10-09 11:15:19 +00:00
|
|
|
|
"Return the bound variable symbol found around point.
|
2005-01-05 01:09:23 +00:00
|
|
|
|
Return 0 if there is no such symbol.
|
|
|
|
|
If ANY-SYMBOL is non-nil, don't insist the symbol be bound."
|
2004-09-02 16:37:22 +00:00
|
|
|
|
(or (condition-case ()
|
|
|
|
|
(with-syntax-table emacs-lisp-mode-syntax-table
|
|
|
|
|
(save-excursion
|
|
|
|
|
(or (not (zerop (skip-syntax-backward "_w")))
|
|
|
|
|
(eq (char-syntax (following-char)) ?w)
|
|
|
|
|
(eq (char-syntax (following-char)) ?_)
|
|
|
|
|
(forward-sexp -1))
|
|
|
|
|
(skip-chars-forward "'")
|
|
|
|
|
(let ((obj (read (current-buffer))))
|
|
|
|
|
(and (symbolp obj) (boundp obj) obj))))
|
|
|
|
|
(error nil))
|
|
|
|
|
(let* ((str (find-tag-default))
|
2004-12-16 13:06:05 +00:00
|
|
|
|
(sym (if str (intern-soft str))))
|
2005-01-05 01:09:23 +00:00
|
|
|
|
(if (and sym (or any-symbol (boundp sym)))
|
2004-12-16 13:06:05 +00:00
|
|
|
|
sym
|
|
|
|
|
(save-match-data
|
|
|
|
|
(when (and str (string-match "\\`\\W*\\(.*?\\)\\W*\\'" str))
|
|
|
|
|
(setq sym (intern-soft (match-string 1 str)))
|
2005-01-05 01:09:23 +00:00
|
|
|
|
(and (or any-symbol (boundp sym)) sym)))))
|
2004-09-02 16:37:22 +00:00
|
|
|
|
0))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
|
|
|
|
|
;;;###autoload
|
|
|
|
|
(defun describe-variable (variable &optional buffer)
|
|
|
|
|
"Display the full documentation of VARIABLE (a symbol).
|
|
|
|
|
Returns the documentation as a string, also.
|
|
|
|
|
If VARIABLE has a buffer-local value in BUFFER (default to the current buffer),
|
|
|
|
|
it is displayed along with the global value."
|
|
|
|
|
(interactive
|
|
|
|
|
(let ((v (variable-at-point))
|
|
|
|
|
(enable-recursive-minibuffers t)
|
|
|
|
|
val)
|
|
|
|
|
(setq val (completing-read (if (symbolp v)
|
|
|
|
|
(format
|
|
|
|
|
"Describe variable (default %s): " v)
|
|
|
|
|
"Describe variable: ")
|
|
|
|
|
obarray 'boundp t nil nil
|
|
|
|
|
(if (symbolp v) (symbol-name v))))
|
|
|
|
|
(list (if (equal val "")
|
|
|
|
|
v (intern val)))))
|
2002-06-23 21:02:45 +00:00
|
|
|
|
(unless (buffer-live-p buffer) (setq buffer (current-buffer)))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(if (not (symbolp variable))
|
|
|
|
|
(message "You did not specify a variable")
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(save-excursion
|
2002-08-15 01:38:45 +00:00
|
|
|
|
(let* ((valvoid (not (with-current-buffer buffer (boundp variable))))
|
|
|
|
|
;; Extract the value before setting up the output buffer,
|
|
|
|
|
;; in case `buffer' *is* the output buffer.
|
|
|
|
|
(val (unless valvoid (buffer-local-value variable buffer))))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(help-setup-xref (list #'describe-variable variable buffer)
|
|
|
|
|
(interactive-p))
|
|
|
|
|
(with-output-to-temp-buffer (help-buffer)
|
|
|
|
|
(with-current-buffer buffer
|
|
|
|
|
(prin1 variable)
|
2002-08-15 01:38:45 +00:00
|
|
|
|
(if valvoid
|
|
|
|
|
(princ " is void")
|
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(princ "'s value is ")
|
|
|
|
|
(terpri)
|
|
|
|
|
(let ((from (point)))
|
|
|
|
|
(pp val)
|
|
|
|
|
(help-xref-on-pp from (point))
|
|
|
|
|
(if (< (point) (+ from 20))
|
2002-08-19 21:23:08 +00:00
|
|
|
|
(delete-region (1- from) from)))))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(terpri)
|
|
|
|
|
(when (local-variable-p variable)
|
2003-05-13 18:35:16 +00:00
|
|
|
|
(princ (format "%socal in buffer %s; "
|
|
|
|
|
(if (get variable 'permanent-local)
|
|
|
|
|
"Permanently l" "L")
|
|
|
|
|
(buffer-name)))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(if (not (default-boundp variable))
|
|
|
|
|
(princ "globally void")
|
|
|
|
|
(let ((val (default-value variable)))
|
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(princ "global value is ")
|
|
|
|
|
(terpri)
|
|
|
|
|
;; Fixme: pp can take an age if you happen to
|
|
|
|
|
;; ask for a very large expression. We should
|
|
|
|
|
;; probably print it raw once and check it's a
|
|
|
|
|
;; sensible size before prettyprinting. -- fx
|
|
|
|
|
(let ((from (point)))
|
|
|
|
|
(pp val)
|
|
|
|
|
(help-xref-on-pp from (point))
|
|
|
|
|
(if (< (point) (+ from 20))
|
2002-06-23 21:02:45 +00:00
|
|
|
|
(delete-region (1- from) from))))))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(terpri))
|
|
|
|
|
(terpri)
|
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(when (> (count-lines (point-min) (point-max)) 10)
|
|
|
|
|
;; Note that setting the syntax table like below
|
|
|
|
|
;; makes forward-sexp move over a `'s' at the end
|
|
|
|
|
;; of a symbol.
|
|
|
|
|
(set-syntax-table emacs-lisp-mode-syntax-table)
|
|
|
|
|
(goto-char (point-min))
|
|
|
|
|
(if valvoid
|
|
|
|
|
(forward-line 1)
|
|
|
|
|
(forward-sexp 1)
|
|
|
|
|
(delete-region (point) (progn (end-of-line) (point)))
|
|
|
|
|
(save-excursion
|
2004-10-13 18:54:21 +00:00
|
|
|
|
(insert "\n\nValue:")
|
|
|
|
|
(set (make-local-variable 'help-button-cache)
|
|
|
|
|
(point-marker)))
|
|
|
|
|
(insert " value is shown ")
|
|
|
|
|
(insert-button "below"
|
|
|
|
|
'action help-button-cache
|
2004-12-17 15:17:02 +00:00
|
|
|
|
'follow-link t
|
2004-10-13 18:54:21 +00:00
|
|
|
|
'help-echo "mouse-2, RET: show value")
|
|
|
|
|
(insert ".\n\n")))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
;; Add a note for variables that have been make-var-buffer-local.
|
|
|
|
|
(when (and (local-variable-if-set-p variable)
|
|
|
|
|
(or (not (local-variable-p variable))
|
|
|
|
|
(with-temp-buffer
|
|
|
|
|
(local-variable-if-set-p variable))))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(save-excursion
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(forward-line -1)
|
|
|
|
|
(insert "Automatically becomes buffer-local when set in any fashion.\n"))))
|
2002-07-12 16:56:03 +00:00
|
|
|
|
;; Mention if it's an alias
|
2002-07-15 15:38:49 +00:00
|
|
|
|
(let* ((alias (condition-case nil
|
2002-07-12 16:56:03 +00:00
|
|
|
|
(indirect-variable variable)
|
2002-07-15 15:38:49 +00:00
|
|
|
|
(error variable)))
|
|
|
|
|
(obsolete (get variable 'byte-obsolete-variable))
|
|
|
|
|
(doc (or (documentation-property variable 'variable-documentation)
|
|
|
|
|
(documentation-property alias 'variable-documentation))))
|
2002-07-12 16:56:03 +00:00
|
|
|
|
(unless (eq alias variable)
|
|
|
|
|
(princ (format "This variable is an alias for `%s'." alias))
|
|
|
|
|
(terpri)
|
2002-07-15 15:38:49 +00:00
|
|
|
|
(terpri))
|
|
|
|
|
(when obsolete
|
|
|
|
|
(princ "This variable is obsolete")
|
|
|
|
|
(if (cdr obsolete) (princ (format " since %s" (cdr obsolete))))
|
2002-07-15 16:17:01 +00:00
|
|
|
|
(princ ";") (terpri)
|
2002-07-15 15:38:49 +00:00
|
|
|
|
(princ (if (stringp (car obsolete)) (car obsolete)
|
|
|
|
|
(format "use `%s' instead." (car obsolete))))
|
|
|
|
|
(terpri)
|
|
|
|
|
(terpri))
|
|
|
|
|
(princ (or doc "Not documented as a variable.")))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
;; Make a link to customize if this variable can be customized.
|
2003-01-07 19:17:46 +00:00
|
|
|
|
(if (custom-variable-p variable)
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(let ((customize-label "customize"))
|
|
|
|
|
(terpri)
|
|
|
|
|
(terpri)
|
|
|
|
|
(princ (concat "You can " customize-label " this variable."))
|
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(save-excursion
|
|
|
|
|
(re-search-backward
|
|
|
|
|
(concat "\\(" customize-label "\\)") nil t)
|
|
|
|
|
(help-xref-button 1 'help-customize-variable variable)))))
|
|
|
|
|
;; Make a hyperlink to the library if appropriate. (Don't
|
|
|
|
|
;; change the format of the buffer's initial line in case
|
|
|
|
|
;; anything expects the current format.)
|
2004-12-27 16:24:20 +00:00
|
|
|
|
(let ((file-name (symbol-file variable 'defvar)))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(when (equal file-name "loaddefs.el")
|
|
|
|
|
;; Find the real def site of the preloaded variable.
|
|
|
|
|
(let ((location
|
|
|
|
|
(condition-case nil
|
|
|
|
|
(find-variable-noselect variable file-name)
|
|
|
|
|
(error nil))))
|
|
|
|
|
(when location
|
|
|
|
|
(with-current-buffer (car location)
|
|
|
|
|
(goto-char (cdr location))
|
|
|
|
|
(when (re-search-backward
|
|
|
|
|
"^;;; Generated autoloads from \\(.*\\)" nil t)
|
|
|
|
|
(setq file-name (match-string 1)))))))
|
2004-04-07 19:38:54 +00:00
|
|
|
|
(when (and (null file-name)
|
|
|
|
|
(integerp (get variable 'variable-documentation)))
|
|
|
|
|
;; It's a variable not defined in Elisp but in C.
|
2004-04-29 18:46:13 +00:00
|
|
|
|
(setq file-name
|
|
|
|
|
(if (get-buffer " *DOC*")
|
|
|
|
|
(help-C-file-name variable 'var)
|
|
|
|
|
'C-source)))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(when file-name
|
|
|
|
|
(princ "\n\nDefined in `")
|
2004-04-29 18:46:13 +00:00
|
|
|
|
(princ (if (eq file-name 'C-source) "C source code" file-name))
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(princ "'.")
|
2001-10-09 11:15:19 +00:00
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(save-excursion
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(re-search-backward "`\\([^`']+\\)'" nil t)
|
|
|
|
|
(help-xref-button 1 'help-variable-def
|
|
|
|
|
variable file-name)))))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
|
2002-01-07 05:20:40 +00:00
|
|
|
|
(print-help-return-message)
|
|
|
|
|
(save-excursion
|
|
|
|
|
(set-buffer standard-output)
|
|
|
|
|
;; Return the text we displayed.
|
|
|
|
|
(buffer-string))))))))
|
2001-10-09 11:15:19 +00:00
|
|
|
|
|
|
|
|
|
|
2001-11-25 22:03:45 +00:00
|
|
|
|
;;;###autoload
|
|
|
|
|
(defun describe-syntax (&optional buffer)
|
|
|
|
|
"Describe the syntax specifications in the syntax table of BUFFER.
|
|
|
|
|
The descriptions are inserted in a help buffer, which is then displayed.
|
|
|
|
|
BUFFER defaults to the current buffer."
|
2001-11-26 10:04:00 +00:00
|
|
|
|
(interactive)
|
2001-11-25 22:03:45 +00:00
|
|
|
|
(setq buffer (or buffer (current-buffer)))
|
|
|
|
|
(help-setup-xref (list #'describe-syntax buffer) (interactive-p))
|
|
|
|
|
(with-output-to-temp-buffer (help-buffer)
|
|
|
|
|
(let ((table (with-current-buffer buffer (syntax-table))))
|
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(describe-vector table 'internal-describe-syntax-value)
|
|
|
|
|
(while (setq table (char-table-parent table))
|
|
|
|
|
(insert "\nThe parent syntax table is:")
|
|
|
|
|
(describe-vector table 'internal-describe-syntax-value))))))
|
|
|
|
|
|
2001-11-27 00:26:41 +00:00
|
|
|
|
(defun help-describe-category-set (value)
|
|
|
|
|
(insert (cond
|
|
|
|
|
((null value) "default")
|
|
|
|
|
((char-table-p value) "deeper char-table ...")
|
|
|
|
|
(t (condition-case err
|
|
|
|
|
(category-set-mnemonics value)
|
|
|
|
|
(error "invalid"))))))
|
|
|
|
|
|
|
|
|
|
;;;###autoload
|
|
|
|
|
(defun describe-categories (&optional buffer)
|
|
|
|
|
"Describe the category specifications in the current category table.
|
2004-02-20 03:48:32 +00:00
|
|
|
|
The descriptions are inserted in a buffer, which is then displayed.
|
|
|
|
|
If BUFFER is non-nil, then describe BUFFER's category table instead.
|
|
|
|
|
BUFFER should be a buffer or a buffer name."
|
2001-11-27 00:26:41 +00:00
|
|
|
|
(interactive)
|
|
|
|
|
(setq buffer (or buffer (current-buffer)))
|
|
|
|
|
(help-setup-xref (list #'describe-categories buffer) (interactive-p))
|
|
|
|
|
(with-output-to-temp-buffer (help-buffer)
|
|
|
|
|
(let ((table (with-current-buffer buffer (category-table))))
|
|
|
|
|
(with-current-buffer standard-output
|
|
|
|
|
(describe-vector table 'help-describe-category-set)
|
|
|
|
|
(let ((docs (char-table-extra-slot table 0)))
|
|
|
|
|
(if (or (not (vectorp docs)) (/= (length docs) 95))
|
|
|
|
|
(insert "Invalid first extra slot in this char table\n")
|
|
|
|
|
(insert "Meanings of mnemonic characters are:\n")
|
|
|
|
|
(dotimes (i 95)
|
|
|
|
|
(let ((elt (aref docs i)))
|
|
|
|
|
(when elt
|
|
|
|
|
(insert (+ i ?\ ) ": " elt "\n"))))
|
|
|
|
|
(while (setq table (char-table-parent table))
|
|
|
|
|
(insert "\nThe parent category table is:")
|
|
|
|
|
(describe-vector table 'help-describe-category-set))))))))
|
|
|
|
|
|
2001-11-26 19:52:07 +00:00
|
|
|
|
(provide 'help-fns)
|
2001-10-09 11:15:19 +00:00
|
|
|
|
|
2003-09-01 15:45:59 +00:00
|
|
|
|
;;; arch-tag: 9e10331c-ae81-4d13-965d-c4819aaab0b3
|
2001-11-26 19:52:07 +00:00
|
|
|
|
;;; help-fns.el ends here
|