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Re: Repeat lambda

From: Juri Linkov
Subject: Re: Repeat lambda
Date: Mon, 29 Mar 2021 22:28:43 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (x86_64-pc-linux-gnu)

>> diff --git a/lisp/repeat.el b/lisp/repeat.el
>> index 84a613da0c..4be4f766ef 100644
>> --- a/lisp/repeat.el
>> +++ b/lisp/repeat.el
>> @@ -398,7 +398,7 @@ repeat-post-hook
>>             (when repeat-exit-key
>>               (define-key map repeat-exit-key 'ignore))
>> -            (set-transient-map map)))))))
>> +            (set-transient-map map t)))))))
> So there is no help message “[Repeat with o, O, ...]” displayed when use 'C-x 
> o O’.

Also I noticed another problem with using `t' for KEEP-PRED in 
it doesn't handle `repeat-exit-key' after every command.  So `t' can't be used.

> Maybe we can wrap all commands in `repeat-map’ and show the help
> message first, then invoke the bound function?

The problem is that currently we get `repeat-map' only from command symbol:

  (get this-command 'repeat-map)

But maybe we could allow the command to set its next repeat-map explicitly:

  (define-key map "O" (lambda ()
                        (setq repeat-map 'other-window-repeat-map)
                        (other-window -1)))

with such patch:

diff --git a/lisp/repeat.el b/lisp/repeat.el
index a2b04b81b0..5ae2ec2967 100644
--- a/lisp/repeat.el
+++ b/lisp/repeat.el
@@ -342,6 +342,8 @@ repeat-exit-key
   :group 'convenience
   :version "28.1")
+;;;###autoload (defvar repeat-map nil)
 (define-minor-mode repeat-mode
   "Toggle Repeat mode.
@@ -364,8 +366,9 @@ repeat-mode
 (defun repeat-post-hook ()
   "Function run after commands to set transient keymap for repeatable keys."
   (when repeat-mode
-    (let ((repeat-map (and (symbolp this-command)
-                           (get this-command 'repeat-map))))
+    (let ((repeat-map (or (and (symbolp this-command)
+                               (get this-command 'repeat-map))
+                          repeat-map)))
       (when repeat-map
         (when (boundp repeat-map)
           (setq repeat-map (symbol-value repeat-map)))
@@ -398,7 +401,8 @@ repeat-post-hook
             (when repeat-exit-key
               (define-key map repeat-exit-key 'ignore))
-            (set-transient-map map)))))))
+            (set-transient-map map))))))
+  (setq repeat-map nil))
 (provide 'repeat)

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