bug#24861: [PATCH] Fix annoying "Parsing...done" message in c++-mode

[Hong Xu]

On 2016-11-18 Fri 23:50 GMT-0800, Eli Zaretskii <eliz@gnu.org> wrote:

>> Cc: 24861@debbugs.gnu.org
>> From: Hong Xu <hong@topbug.net>
>> Date: Fri, 18 Nov 2016 11:55:28 -0800
>> 
>> Allow users to customize the maximum frequency that
>> `cpp-progress-message' prints messages.
>> 
>>      * progmodes/cpp.el (cpp-message-min-time-interval)
>>      (cpp-progress-message): Add variable
>>      `cpp-message-min-time-interval' to indicate the minimum time
>>      interval in seconds that `cpp-progress-message' prints messages.
>> 
>>      * progmodes/cpp.el (cpp-progress-time): Initialize to '(0 0 0 0) 
>> instead of
>>      0 and improve the documentation.
>> 
>>      * progmodes/cpp.el (cpp-highlight-buffer): Use
>>      `cpp-progress-message' instead of `message'.
>
> Thanks, but there are still left-overs:
>
>> +(defcustom cpp-message-min-time-interval 1.0
>> +  "Indicate the minimum time interval in seconds that
>> +`cpp-progress-message' should print messages.
>
> This should be one line, so the sentence should be shorter to fit.  If
> you drop the redundant "Indicate the" part, it will come close.
>
>> -(defvar cpp-progress-time 0)
>> -;; Last time we issued a progress message.
>> +(defvar cpp-progress-time '(0 0 0 0)
>
> You could leave it at 0, no need to have a list here.
>
>> +  "Indicate the last time `cpp-progress-message' issued a
>> +  progress message.")
>
> This should be a single line.  Once again, please drop the uneeded
> "Indicate" part.
>
>>  (defun cpp-progress-message (&rest args)
>> -  ;; Report progress at most once a second.  Take same ARGS as `message'.
>> -  (let ((time (nth 1 (current-time))))
>> -    (if (= time cpp-progress-time)
>> -    ()
>> -      (setq cpp-progress-time time)
>> -      (apply 'message args))))
>> +  "Report progress by printing messages at most once every
>> +`cpp-message-min-time-interval' seconds for functions whose names
>> +start with \"cpp-\".  If `cpp-message-min-time-interval' is nil,
>> +it prints no message.  The ARGS are the same as in `message'."
>
> The first sentence of the doc string should take only one line.

Thanks, updated.



Allow users to customize the maximum frequency that `cpp-progress-message' 
prints messages.

* progmodes/cpp.el (cpp-message-min-time-interval)
(cpp-progress-message): Add variable
`cpp-message-min-time-interval' to indicate the minimum time
interval in seconds that `cpp-progress-message' prints messages.

* progmodes/cpp.el (cpp-progress-time): Improve the documentation.

* progmodes/cpp.el (cpp-highlight-buffer): Use
`cpp-progress-message' instead of `message' to print messages.

diff --git a/lisp/progmodes/cpp.el b/lisp/progmodes/cpp.el
index 7d641ab47f09..fc8c271cc5ec 100644
--- a/lisp/progmodes/cpp.el
+++ b/lisp/progmodes/cpp.el
@@ -104,6 +104,13 @@ cpp-edit-list
                               (const :tag "Both branches writable" both))))
   :group 'cpp)
 
+(defcustom cpp-message-min-time-interval 1.0
+  "The minimum time interval in seconds that `cpp-progress-message' prints 
messages.
+If it is set to nil, `cpp-progress-message' prints no message."
+  :type 'float
+  :group 'cpp
+  :version "26.1")
+
 (defvar cpp-overlay-list nil)
 ;; List of cpp overlays active in the current buffer.
 (make-variable-buffer-local 'cpp-overlay-list)
@@ -278,7 +285,7 @@ cpp-highlight-buffer
                          (cpp-parse-close from to))
                         (t
                          (cpp-parse-error "Parser error"))))))))
-      (message "Parsing...done"))
+      (cpp-progress-message "Parsing...done"))
     (if cpp-state-stack
       (save-excursion
        (goto-char (nth 3 (car cpp-state-stack)))
@@ -819,16 +826,21 @@ cpp-face-name
 
 ;;; Utilities:
 
-(defvar cpp-progress-time 0)
-;; Last time we issued a progress message.
+(defvar cpp-progress-time 0
+  "The last time `cpp-progress-message' issued a progress message.")
 
 (defun cpp-progress-message (&rest args)
-  ;; Report progress at most once a second.  Take same ARGS as `message'.
-  (let ((time (nth 1 (current-time))))
-    (if (= time cpp-progress-time)
-       ()
-      (setq cpp-progress-time time)
-      (apply 'message args))))
+  "Report progress by printing messages used by \"cpp-\" functions.
+It prints messages at most once every
+`cpp-message-min-time-interval' seconds.  If
+`cpp-message-min-time-interval' is nil, it prints no message.
+The ARGS are the same as in `message'."
+  (when cpp-message-min-time-interval
+    (let ((time (current-time)))
+      (when (>= (float-time (time-subtract time cpp-progress-time))
+                cpp-message-min-time-interval)
+        (setq cpp-progress-time time)
+        (apply 'message args)))))
 
 (provide 'cpp)

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