X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/657a790941c2074501634e2d278225af0d729d1d..09fd8197ffbbd7e7fe6339f86a3477531d20ab27:/lisp/help-macro.el diff --git a/lisp/help-macro.el b/lisp/help-macro.el index 61fde2c58b..cc78bd7121 100644 --- a/lisp/help-macro.el +++ b/lisp/help-macro.el @@ -1,12 +1,12 @@ -;;; help-macro.el --- Makes command line help such as help-for-help +;;; help-macro.el --- makes command line help such as help-for-help -;; Copyright (C) 1993 Free Software Foundation, Inc. +;; Copyright (C) 1993, 1994, 2002, 2003, 2004, +;; 2005, 2006 Free Software Foundation, Inc. ;; Author: Lynn Slater -;; Created: : Mon Oct 1 11:42:39 1990 +;; Maintainer: FSF +;; Created: Mon Oct 1 11:42:39 1990 ;; Adapted-By: ESR -;; Last Modified By: Lynn Slater x2048 -;; Last Modified On: Mon Sep 23 14:40:19 1991 ;; This file is part of GNU Emacs. @@ -21,15 +21,16 @@ ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License -;; along with GNU Emacs; see the file COPYING. If not, write to -;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. +;; along with GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. ;;; Commentary: -;; -;; This file supplies the macro make-help-screen which constructs + +;; 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 +;; 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 @@ -44,7 +45,7 @@ ;;-> ;;->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 +;;-> 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. @@ -62,83 +63,140 @@ ;;; Change Log: ;; -;; 22-Jan-1991 Lynn Slater x2048 +;; 22-Jan-1991 Lynn Slater x2048 ;; Last Modified: Mon Oct 1 11:43:52 1990 #3 (Lynn Slater) ;; documented better ;;; Code: -(provide 'help-macro) (require 'backquote) +;;;###autoload +(defcustom three-step-help nil + "*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) + (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 is requested, FNAME displays HELP-TEXT +If the command is the help character, FNAME displays HELP-TEXT and continues trying to read a command using HELPED-MAP. +If HELP-TEXT contains the sequence `%THIS-KEY%', that is replaced +with the key sequence that invoked FNAME. When FNAME finally does get a command, it executes that command and then returns." - (` (defun (, fname) () - (, help-text) + (let ((doc-fn (intern (concat (symbol-name fname) "-doc")))) + `(progn + (defun ,doc-fn () ,help-text) + (defun ,fname () + "Help command." (interactive) (let ((line-prompt - (substitute-command-keys (, help-line))) - (help-screen (documentation (quote (, fname))))) - (message line-prompt) - (let ((old-local-map (current-local-map)) - (old-global-map (current-global-map)) - (minor-mode-map-alist nil) - config key char) + (substitute-command-keys ,help-line))) + (if three-step-help + (message "%s" line-prompt)) + (let* ((help-screen (documentation (quote ,doc-fn))) + ;; 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 char) + (if (string-match "%THIS-KEY%" help-screen) + (setq help-screen + (replace-match (key-description (substring (this-command-keys) 0 -1)) + t t help-screen))) (unwind-protect (progn - (use-global-map (, helped-map)) - (use-local-map nil) - (setq key (read-key-sequence nil)) - (setq char (aref key 0)) - (if (or (eq char ??) (eq char help-char)) + (setcdr local-map ,helped-map) + (define-key local-map [t] 'undefined) + ;; Make the scroll bar keep working normally. + (define-key local-map [vertical-scroll-bar] + (lookup-key global-map [vertical-scroll-bar])) + (if three-step-help + (progn + (setq key (let ((overriding-local-map local-map)) + (read-key-sequence nil))) + ;; Make the HELP key translate to C-h. + (if (lookup-key function-key-map key) + (setq key (lookup-key function-key-map key))) + (setq char (aref key 0))) + (setq char ??)) + (if (or (eq char ??) (eq char help-char) + (memq char help-event-list)) (progn (setq config (current-window-configuration)) (switch-to-buffer-other-window "*Help*") - (erase-buffer) - (insert help-screen) + (and (fboundp 'make-frame) + (not (eq (window-frame (selected-window)) + prev-frame)) + (setq new-frame (window-frame (selected-window)) + config nil)) + (setq buffer-read-only nil) + (let ((inhibit-read-only t)) + (erase-buffer) + (insert help-screen)) + (help-mode) (goto-char (point-min)) - (while (memq char (cons help-char '(?? ?\C-v ?\ ?\177 ?\M-v))) + (while (or (memq char (append help-event-list + (cons help-char '(?? ?\C-v ?\s ?\177 delete backspace vertical-scroll-bar ?\M-v)))) + (eq (car-safe char) 'switch-frame) + (equal key "\M-v")) (condition-case nil (progn + (if (eq (car-safe char) 'switch-frame) + (handle-switch-frame char)) (if (memq char '(?\C-v ?\ )) (scroll-up)) - (if (memq char '(?\177 ?\M-v)) + (if (or (memq char '(?\177 ?\M-v + delete backspace)) + (equal key "\M-v")) (scroll-down))) (error nil)) - (message "%s%s: " - line-prompt - (if (pos-visible-in-window-p (point-max)) - "" " or Space to scroll")) - (let ((cursor-in-echo-area t)) - (setq key (read-key-sequence nil) - char (aref key 0)))))) + (let ((cursor-in-echo-area t) + (overriding-local-map local-map)) + (setq key (read-key-sequence + (format "Type one of the options listed%s: " + (if (pos-visible-in-window-p + (point-max)) + "" ", or SPACE or DEL to scroll"))) + char (aref key 0))) + + ;; If this is a scroll bar command, just run it. + (when (eq char 'vertical-scroll-bar) + (command-execute (lookup-key local-map key) nil key))))) + ;; We don't need the prompt any more. + (message "") ;; Mouse clicks are not part of the help feature, ;; so reexecute them in the standard environment. (if (listp char) (setq unread-command-events (cons char unread-command-events) config nil) - (let ((defn (key-binding key))) + (let ((defn (lookup-key local-map key))) (if defn (progn (if config (progn (set-window-configuration config) (setq config nil))) - (use-local-map old-local-map) - (use-global-map old-global-map) + (if new-frame + (progn (iconify-frame new-frame) + (setq new-frame nil))) (call-interactively defn)) (ding))))) - (use-local-map old-local-map) - (use-global-map old-global-map) + (if new-frame (iconify-frame new-frame)) (if config (set-window-configuration config)))))) - )) + ))) -;;; help-macro.el +(provide 'help-macro) +;;; arch-tag: 59fee949-1686-485a-8a05-83418073e257 +;;; help-macro.el ends here