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Fix key bindings.
(electric-help-mode): Use mouse-leave-buffer-hook. (electric-help-retain): Remove mouse-leave-buffer-hook. (with-electric-help): New argument minheight. (electric-help-execute-extended): New function. (electric-help-ctrl-x-prefix): New function. (electric-help-command-loop): Make messages more consistent. Include strategic sit-for 0, so that pos-visible-in-window-p will return the right thing. Make 2nd arg of Electric-command-loop return 'noprompt if we are in isearch-mode. Eval to-be-executed at the very end. (ehelp-map): Electrify apropos too.
This commit is contained in:
Richard M. Stallman
parent
f135afd313
commit
f98e758c2f
@ -45,8 +45,20 @@
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(if electric-help-map
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()
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(let ((map (make-keymap)))
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;; allow all non-self-inserting keys - search, scroll, etc
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;; allow all non-self-inserting keys - search, scroll, etc, but
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;; let M-x and C-x exit ehelp mode and retain buffer:
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(suppress-keymap map)
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(define-key map "\C-u" 'electric-help-undefined)
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(define-key map [?\C-0] 'electric-help-undefined)
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(define-key map [?\C-1] 'electric-help-undefined)
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(define-key map [?\C-2] 'electric-help-undefined)
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(define-key map [?\C-3] 'electric-help-undefined)
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(define-key map [?\C-4] 'electric-help-undefined)
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(define-key map [?\C-5] 'electric-help-undefined)
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(define-key map [?\C-6] 'electric-help-undefined)
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(define-key map [?\C-7] 'electric-help-undefined)
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(define-key map [?\C-8] 'electric-help-undefined)
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(define-key map [?\C-9] 'electric-help-undefined)
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(define-key map (char-to-string help-char) 'electric-help-help)
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(define-key map "?" 'electric-help-help)
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(define-key map " " 'scroll-up)
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@ -60,9 +72,11 @@
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;;a better key than this?
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(define-key map "r" 'electric-help-retain)
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(define-key map "R" 'electric-help-retain)
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(define-key map "\ex" 'electric-help-execute-extended)
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(define-key map "\C-x" 'electric-help-ctrl-x-prefix)
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(setq electric-help-map map)))
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(defun electric-help-mode ()
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"`with-electric-help' temporarily places its buffer in this mode.
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\(On exit from `with-electric-help', the buffer is put in `default-major-mode'.)"
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@ -71,6 +85,7 @@
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(setq major-mode 'help)
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(setq mode-line-buffer-identification '(" Help: %b"))
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(use-local-map electric-help-map)
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(setq mouse-leave-buffer-hook '(electric-help-retain))
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;; this is done below in with-electric-help
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;(run-hooks 'electric-help-mode-hook)
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)
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@ -78,10 +93,11 @@
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;;;###autoload
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(defun with-electric-help (thunk &optional buffer noerase)
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"Pop up an \"electric\" help buffer.
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Arguments are THUNK &optional BUFFER NOERASE. BUFFER defaults to `*Help*'.
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THUNK is a function of no arguments which is called to initialize
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the contents of BUFFER. BUFFER will be erased before THUNK is called unless
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NOERASE is non-nil. THUNK will be called with `standard-output' bound to
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The arguments are THUNK &optional BUFFER NOERASE MINHEIGHT.
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THUNK is a function of no arguments which is called to initialize the
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contents of BUFFER. BUFFER defaults to `*Help*'. BUFFER will be
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erased before THUNK is called unless NOERASE is non-nil. THUNK will
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be called while BUFFER is current and with `standard-output' bound to
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the buffer specified by BUFFER.
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If THUNK returns nil, we display BUFFER starting at the top, and
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@ -89,14 +105,21 @@ shrink the window to fit. If THUNK returns non-nil, we don't do those things.
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After THUNK has been called, this function \"electrically\" pops up a window
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in which BUFFER is displayed and allows the user to scroll through that buffer
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in electric-help-mode.
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in electric-help-mode. The window's height will be at least MINHEIGHT if
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this value is non-nil.
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If THUNK returns nil, we display BUFFER starting at the top, and
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shrink the window to fit. If THUNK returns non-nil, we don't do those
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things.
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When the user exits (with `electric-help-exit', or otherwise) the help
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buffer's window disappears (i.e., we use `save-window-excursion')
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BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
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(setq buffer (get-buffer-create (or buffer "*Help*")))
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(let ((one (one-window-p t))
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(config (current-window-configuration))
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(bury nil))
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(bury nil)
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(to-be-executed nil))
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(unwind-protect
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(save-excursion
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(if one (goto-char (window-start (selected-window))))
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@ -104,8 +127,9 @@ BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
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(pop-to-buffer buffer))
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(save-excursion
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(set-buffer buffer)
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(if (and minheight (< (window-height) minheight))
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(enlarge-window (- minheight (window-height))))
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(electric-help-mode)
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(setq buffer-read-only nil)
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(or noerase (erase-buffer)))
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(let ((standard-output buffer))
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(if (not (funcall thunk))
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@ -133,7 +157,8 @@ BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
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;; so that when we say "Press space to bury" we mean it
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(replace-buffer-in-windows buffer)
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;; must do this outside of save-window-excursion
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(bury-buffer buffer))))))
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(bury-buffer buffer)))
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(eval to-be-executed))))
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(defun electric-help-command-loop ()
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(catch 'exit
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@ -155,9 +180,13 @@ BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
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(Electric-command-loop
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'exit
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(function (lambda ()
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(sit-for 0) ;necessary if last command was end-of-buffer or
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;beginning-of-buffer - otherwise pos-visible-in-window-p
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;will yield a wrong result.
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(let ((min (pos-visible-in-window-p (point-min)))
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(max (pos-visible-in-window-p (point-max))))
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(cond ((and min max)
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(cond (isearch-mode 'noprompt)
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((and min max)
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(cond (standard "Press q to exit, r to retain ")
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(neither)
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(t (setq neither (substitute-command-keys "Press \\[electric-help-exit] to exit, \\[electric-help-retain] to retain ")))))
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@ -166,11 +195,11 @@ BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
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(up)
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(t (setq up (substitute-command-keys "Press \\[scroll-up] to scroll, \\[electric-help-exit] to exit, \\[electric-help-retain] to retain ")))))
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(max
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(cond (standard "Press DEL to scroll back, q to exit ")
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(cond (standard "Press DEL to scroll back, q to exit, r to retain ")
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(down)
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(t (setq down (substitute-command-keys "Press \\[scroll-down] to scroll back, \\[electric-help-exit] to exit, \\[electric-help-retain] to retain ")))))
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(t
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(cond (standard "Press SPC to scroll, DEL to scroll back, q to exit ")
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(cond (standard "Press SPC to scroll, DEL to scroll back, q to exit, r to retain ")
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(both)
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(t (setq both (substitute-command-keys "Press \\[scroll-up] to scroll, \\[scroll-down] to scroll back, \\[electric-help-exit] to exit, \\[electric-help-retain] to retain ")))))))))
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t))))
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@ -194,15 +223,20 @@ BUFFER is put into `default-major-mode' (or `fundamental-mode') when we exit."
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\(The *Help* buffer will not be selected, but \\[switch-to-buffer-other-window] RET
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will select it.)"
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(interactive)
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(throw 'exit '(retain)))
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;; Make sure that we don't throw twice, even if two events cause
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;; calling this function:
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(if mouse-leave-buffer-hook
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(progn
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(setq mouse-leave-buffer-hook nil)
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(throw 'exit '(retain)))))
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(defun electric-help-undefined ()
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(interactive)
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(error "%s is undefined -- Press %s to exit"
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(mapconcat 'single-key-description (this-command-keys) " ")
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(if (eq (key-binding "Q") 'electric-help-exit)
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"Q"
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(if (eq (key-binding "q") 'electric-help-exit)
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"q"
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(substitute-command-keys "\\[electric-help-exit]"))))
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@ -270,6 +304,22 @@ will select it.)"
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(set-buffer-modified-p m))))))
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(with-electric-help 'ignore name t))))
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;; This is to be bound to M-x in ehelp mode. Retains ehelp buffer and then
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;; continues with execute-extended-command.
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(defun electric-help-execute-extended (prefixarg)
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(interactive "p")
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(setq to-be-executed '(execute-extended-command nil))
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(electric-help-retain))
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;; This is to be buond to C-x in ehelp mode. Retains ehelp buffer and then
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;; continues with ctrl-x prefix.
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(defun electric-help-ctrl-x-prefix (prefixarg)
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(interactive "p")
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(setq to-be-executed '(progn (message nil) (setq unread-command-char ?\C-x)))
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(electric-help-retain))
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(defun electric-describe-key ()
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(interactive)
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@ -321,6 +371,7 @@ will select it.)"
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(if ehelp-map
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nil
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(let ((map (copy-keymap help-map)))
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(substitute-key-definition 'apropos 'electric-apropos map)
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(substitute-key-definition 'command-apropos 'electric-command-apropos map)
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(substitute-key-definition 'describe-key 'electric-describe-key map)
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(substitute-key-definition 'describe-mode 'electric-describe-mode map)
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