Re: emacs -nw FILE incurs 2-second wait before displaying anything

Re: emacs -nw FILE incurs 2-second wait before displaying anything

[Jim Meyering]

On Mon, May 26, 2014 at 8:28 PM, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
>> This problem arises only with OS X's "Terminal" (2.3 (309)), but not
>> with aterm, xterm, or iTerm.  Here's the output of "C-h l":
>
>> ESC [ > 8 3 ; 4 0 0 0 3 ; 0 c C-h l
>
> Hmmm... can you check with the Emacs pretest (24.3.91 or checked out
> from `emacs-24')?  If you still see the problem there, please make it
> a bug report so we can better track it.

I confirm that the 2-second delay still strikes when using a
just-bootstrapped-from-"emacs-24" binary and running
src/emacs -nw -Q FILE.  I see the same output as above for "C-h l".

As mentioned above, it appears to be terminal specific,
striking only when using OS X's "Terminal".
The delay arises before the contents of the FILE is first displayed,
and can be skipped if you know to type a key during that short
interval.  For some initial discussion, see this thread:

  https://lists.gnu.org/archive/html/emacs-devel/2014-05/msg00445.html

bug#17607: emacs -nw FILE incurs 2-second wait before displaying anything

[Stefan Monnier]

[ Please don't crosspost messages between emacs-devel and bug-gnu-emacs.
  Or between bug-gnu-emacs and pretty much anything else.  ]

>>> This problem arises only with OS X's "Terminal" (2.3 (309)), but not
>>> with aterm, xterm, or iTerm.  Here's the output of "C-h l":
>>> ESC [ > 8 3 ; 4 0 0 0 3 ; 0 c C-h l
>> Hmmm... can you check with the Emacs pretest (24.3.91 or checked out
>> from `emacs-24')?  If you still see the problem there, please make it
>> a bug report so we can better track it.
> I confirm that the 2-second delay still strikes when using a
> just-bootstrapped-from-"emacs-24" binary and running
> src/emacs -nw -Q FILE.  I see the same output as above for "C-h l".

Does the patch below fix the 2-second wait?


        Stefan


=== modified file 'lisp/term/xterm.el'
--- lisp/term/xterm.el	2014-04-22 20:35:33 +0000
+++ lisp/term/xterm.el	2014-06-12 13:30:56 +0000
@@ -509,6 +509,10 @@
           ;; Gnome terminal 3.6.1 reports 1;3406;0
           ;; Gnome terminal 2.32.1 reports 1;2802;0
           (setq version 200))
+        (when (and (> version 2000) (equal (match-string 1 str) "83"))
+          ;; OSX's Terminal.app (version 2.3 (309), which returns 83;40003;0)
+          ;; seems to also lack support for some of these.
+          (setq version 240))
         ;; If version is 242 or higher, assume the xterm supports
         ;; reporting the background color (TODO: maybe earlier
         ;; versions do too...)

bug#17607: emacs -nw FILE incurs 2-second wait before displaying anything

[Jim Meyering]

On Thu, Jun 12, 2014 at 6:35 AM, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
...
> Does the patch below fix the 2-second wait?
...

Yes, it does.  Thank you!

bug#17607: emacs -nw FILE incurs 2-second wait before displaying anything

[Stefan Monnier]

>> Does the patch below fix the 2-second wait?
> Yes, it does.  Thank you!

Thanks, installed into emacs-24.


        Stefan