Mercurial > hg > xemacs-beta

view lisp/help-macro.el @ 613:023b83f4e54b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[xemacs-hg @ 2001-06-10 10:42:16 by ben] ------ signal-code changes ------ data.c, device-tty.c, emacs.c, floatfns.c, linuxplay.c, nas.c, process-unix.c, signal.c, sunplay.c, sysdep.c, syssignal.h: use EMACS_SIGNAL everywhere instead of playing preprocessing games with signal(). s\windowsnt.h, s\mingw32.h, syssignal.h: Remove mswindows signal code from s+m headers and move to syssignal.h as one of the five ways of signal handling, instead of playing preprocessing games. fileio.c, sysdep.c: Rename sys_do_signal to qxe_reliable_signal. signal.c, process-unix.c, profile.c: Create set_timeout_signal(); use instead of just EMACS_SIGNAL to establish a signal handler on a timeout signal; this does special things under Cygwin. nt.c: Eliminate term_ntproc(), which is blank; used as a SIGABRT handler, which was wrong anyway. nt.c, win32.c: Move signal code from nt.c to win32.c, since Cygwin needs it too when dealing with timeout signals. s\cygwin32.h: Define CYGWIN_BROKEN_SIGNALS. ------ other changes ------ s\mingw32.h: Fix problems with NOT_C_CODE being in the wrong place and excluding defines needed when building Makefile.in.in. filelock.c, mule-canna.c, mule-ccl.c, mule-ccl.h, ralloc.c, unexalpha.c, unexapollo.c, unexcw.c, unexelfsgi.c, unexnt.c, unexsni.c, s\aix3-1.h, s\bsd4-1.h, s\bsd4-2.h, s\bsd4-3.h, s\cxux.h, s\cygwin32.h, s\dgux.h, s\dgux5-4r2.h, s\dgux5-4r3.h, s\dgux5-4r4.h, s\ewsux5r4.h, s\gnu.h, s\hpux.h, s\iris3-5.h, s\iris3-6.h, s\irix3-3.h, s\linux.h, s\mingw32.h, s\newsos5.h, s\nextstep.h, s\ptx.h, s\riscix1-1.h, s\riscix1-2.h, s\rtu.h, s\sco4.h, s\sco5.h, s\template.h, s\ultrix.h, s\umax.h, s\umips.h, s\unipl5-0.h, s\unipl5-2.h, s\usg5-0.h, s\usg5-2-2.h, s\usg5-2.h, s\usg5-3.h, s\usg5-4.h, s\windowsnt.h, s\xenix.h: Rename 'GNU Emacs' to XEmacs in the copyright and comments. nas.c: Stylistic cleanup. Avoid preprocessing games with names such as play_sound_file. ------ signal-code changes ------ data.c, device-tty.c, emacs.c, floatfns.c, linuxplay.c, nas.c, process-unix.c, signal.c, sunplay.c, sysdep.c, syssignal.h: use EMACS_SIGNAL everywhere instead of playing preprocessing games with signal(). s\windowsnt.h, s\mingw32.h, syssignal.h: Remove mswindows signal code from s+m headers and move to syssignal.h as one of the five ways of signal handling, instead of playing preprocessing games. fileio.c, sysdep.c: Rename sys_do_signal to qxe_reliable_signal. signal.c, process-unix.c, profile.c: Create set_timeout_signal(); use instead of just EMACS_SIGNAL to establish a signal handler on a timeout signal; this does special things under Cygwin. nt.c: Eliminate term_ntproc(), which is blank; used as a SIGABRT handler, which was wrong anyway. nt.c, win32.c: Move signal code from nt.c to win32.c, since Cygwin needs it too when dealing with timeout signals. s\cygwin32.h: Define CYGWIN_BROKEN_SIGNALS. ------ other changes ------ s\mingw32.h: Fix problems with NOT_C_CODE being in the wrong place and excluding defines needed when building Makefile.in.in. filelock.c, mule-canna.c, mule-ccl.c, mule-ccl.h, ralloc.c, unexalpha.c, unexapollo.c, unexcw.c, unexelfsgi.c, unexnt.c, unexsni.c, s\aix3-1.h, s\bsd4-1.h, s\bsd4-2.h, s\bsd4-3.h, s\cxux.h, s\cygwin32.h, s\dgux.h, s\dgux5-4r2.h, s\dgux5-4r3.h, s\dgux5-4r4.h, s\ewsux5r4.h, s\gnu.h, s\hpux.h, s\iris3-5.h, s\iris3-6.h, s\irix3-3.h, s\linux.h, s\mingw32.h, s\newsos5.h, s\nextstep.h, s\ptx.h, s\riscix1-1.h, s\riscix1-2.h, s\rtu.h, s\sco4.h, s\sco5.h, s\template.h, s\ultrix.h, s\umax.h, s\umips.h, s\unipl5-0.h, s\unipl5-2.h, s\usg5-0.h, s\usg5-2-2.h, s\usg5-2.h, s\usg5-3.h, s\usg5-4.h, s\windowsnt.h, s\xenix.h: Rename 'GNU Emacs' to XEmacs in the copyright and comments. nas.c: Stylistic cleanup. Avoid preprocessing games with names such as play_sound_file. xemacs-faq.texi: Update sections on Windows and MacOS availability. alist.el, apropos.el, autoload.el, bytecomp.el, cl-compat.el, cl-extra.el, cl-macs.el, cl-seq.el, cl.el, cmdloop.el, cus-edit.el, derived.el, gpm.el, itimer.el, lisp-mode.el, shadow.el, version.el, wid-browse.el: Rename 'GNU Emacs' to XEmacs in the copyright. Fix other references to GNU Emacs that should be XEmacs or just Emacs. files.el: Fix warning. simple.el: transpose-line-up/down will now move the region up or down by a line if active. cvtmail.c, fakemail.c, gnuserv.c, gnuserv.h, gnuslib.c, make-msgfile.c, make-path.c, pop.c, pop.h, profile.c, tcp.c: Rename 'GNU Emacs' to XEmacs in the copyright. Fix comments in similar ways. digest-doc.c, sorted-doc.c: Fix program and author name to reflect XEmacs.
author ben
date Sun, 10 Jun 2001 10:42:39 +0000
parents 7039e6323819
children 445bd1969ed0
line wrap: on
line source

;;; help-macro.el --- Makes command line help such as help-for-help

;; Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc.

;; Author: Lynn Slater <lrs@indetech.com>
;; Maintainer: FSF
;; Created: : Mon Oct  1 11:42:39 1990
;; Adapted-By: ESR

;; This file is part of XEmacs.

;; XEmacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; XEmacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;; Synched up with: FSF 20.2.

;; This file supplies the macro make-help-screen which constructs
;; single character dispatching with browsable help such as that provided
;; by help-for-help. This can be used to make many modes easier to use; for
;; example, the Gnu Emacs Empire Tool uses this for every "nested" mode map
;; called from the main mode map.

;;       The name of this package was changed from help-screen.el to
;; help-macro.el in order to fit in a 14-character limit.

;;-> ***********************  Example of use *********************************

;;->(make-help-screen help-for-empire-redistribute-map
;;->		  "c:civ m:mil p:population f:food ?"
;;->		  "You have discovered the GEET redistribution commands
;;->   From here, you can use the following options:
;;->
;;->c	Redistribute civs from overfull sectors into connected underfull ones
;;->	  The functions typically named by empire-ideal-civ-fcn control
;;->          based in part on empire-sector-civ-threshold  
;;->m	Redistribute military using levels given by empire-ideal-mil-fcn
;;->p	Redistribute excess population to highways for max pop growth
;;->	  Excess is any sector so full babies will not be born.
;;->f	Even out food on highways to highway min and leave levels
;;->	  This is good to pump max food to all warehouses/dist pts
;;->
;;->
;;->Use \\[help-for-empire-redistribute-map] for help on redistribution.
;;->Use \\[help-for-empire-extract-map] for help on data extraction.
;;->Please use \\[describe-key] to find out more about any of the other keys."
;;->		  empire-shell-redistribute-map)

;;->  (define-key c-mp "\C-h" 'help-for-empire-redistribute-map)
;;->  (define-key c-mp help-character 'help-for-empire-redistribute-map)

;;; Code:

(provide 'help-macro)

;;;###autoload
(defcustom three-step-help t
  "*Non-nil means give more info about Help command in three steps.
The three steps are simple prompt, prompt with all options,
and window listing and describing the options.
A value of nil means skip the middle step, so that
\\[help-command] \\[help-command] gives the window that lists the options."
  :type 'boolean
  :group 'help-appearance)

(defmacro make-help-screen (fname help-line help-text helped-map)
  "Construct help-menu function name FNAME.
When invoked, FNAME shows HELP-LINE and reads a command using
HELPED-MAP.  If the command is the help character, FNAME displays
HELP-TEXT and continues trying to read a command using HELPED-MAP.
When FNAME finally does get a command, it executes that command and
then returns.  As of 21.5 (or 21.4?), HELP-LINE and HELP-TEXT are
`eval'd, just like for a function call.  This allows you to place
Lisp expressions in those arguments."
  `(defun ,fname ()
     ,(eval help-text)
     (interactive)
     (flet ((help-read-key (prompt)
	      ;; This is in `flet' to avoid problems with autoloading.
	      ;; #### The function is ill-conceived -- there should be
	      ;; a way to do it without all the hassle!
	      (let (events)
		(while (not (key-press-event-p
			     (aref (setq events (read-key-sequence prompt)) 0)))
		  ;; Mouse clicks are not part of the help feature, so
		  ;; reexecute them in the standard environment.
		  (mapc 'dispatch-event events))
		(let ((key (nconc (event-modifiers (aref events 0))
				  (list (event-key (aref events 0))))))
		  ;; Make the HELP key translate to C-h.
		  (when (lookup-key function-key-map key)
		    (setq key (lookup-key function-key-map key)))
		  (if (eq (length key) 1)
		      (car key)
		    key)))))
       (let ((line-prompt
	      (substitute-command-keys ,(eval help-line))))
	 (when three-step-help
	   (message "%s" line-prompt))
	 (let* ((help-screen (documentation (quote ,fname)))
		;; We bind overriding-local-map for very small
		;; sections, *excluding* where we switch buffers and
		;; where we execute the chosen help command.
		(local-map (make-sparse-keymap))
		(minor-mode-map-alist nil)
		(prev-frame (selected-frame))
		config new-frame key)
	   (unwind-protect
	       (progn
		 (set-keymap-parents local-map (list ,helped-map))
		 (cond (three-step-help
			(let* ((overriding-local-map local-map))
			  (setq key (help-read-key nil))))
		       (t
			(setq key ??)))
		 (when (or (equal key ??)
			   (equal key (list help-char)))
		   (setq config (current-window-configuration))
		   (switch-to-buffer-other-window "*Help*")
		   (and (not (eq (window-frame (selected-window))
				 prev-frame))
			(setq new-frame (window-frame (selected-window))
			      config nil))
		   (setq buffer-read-only nil)
		   (erase-buffer)
		   (insert help-screen)
		   (help-mode)
		   (goto-char (point-min))
		   (while (member key `((,help-char) ?? (control v) space ?\177
					delete backspace (meta v)))
		     (ignore-errors
		       (cond ((member key '((control v) space))
			      (scroll-up))
			     ((member key '(?\177 delete (meta v) backspace))
			      (scroll-down))))
		     (let ((cursor-in-echo-area t)
			   (overriding-local-map local-map))
		       (setq key (help-read-key
				  (format "Type one of the options listed%s: "
					  (if (pos-visible-in-window-p
					       (point-max))
					      "" " or Space to scroll")))))))
		 ;; We don't need the prompt any more.
		 (message nil)
		 (let ((defn (lookup-key local-map key)))
		   (cond (defn
			   (when config
			     (set-window-configuration config)
			     (setq config nil))
			   (when new-frame
			     (iconify-frame new-frame)
			     (setq new-frame nil))
			   (call-interactively defn))
			 (t
			  (ding)))))
	     (and (get-buffer "*Help*")
		  (bury-buffer "*Help*"))
	     (and new-frame (iconify-frame new-frame))
	     (and config
		  (set-window-configuration config))))))))

;;; help-macro.el