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* bug#44983: Truncate long lines of grep output
@ 2020-12-01  8:45 Juri Linkov
  2020-12-01 15:02 ` Dmitry Gutov
  0 siblings, 1 reply; 57+ messages in thread
From: Juri Linkov @ 2020-12-01  8:45 UTC (permalink / raw)
  To: 44983

[New bug report from emacs-devel]
>>>> For grep output a bigger problem is that grep on binary data
>>>> might output too long lines before the terminating newline.
>>>
>>> (*) We already have this kind of problem with "normal" files which contain
>>> minified assets (JS or CSS). The file contents are usually normal ASCII,
>>> but it's just one line which can reach several MBs in length.
>>>
>>> The usual way to deal with that is with project-ignores and
>>> grep-find-ignored-files. That works for both cases.
>> This is a bug problem - often grep output lines are so long
>> that Emacs freezes, so need to kill the process.  Updating
>> manually ignored-files every time a new file causes freeze
>> is very unreliable and time-consuming workaround.
>
> And a non-obvious one (for an average user).
>
> Is the same problem exhibited by commands using the Xref UI? I don't
> remember seeing it, but of course our projects can be very different.

No difference from grep, Xref output has the same problem.

>> I tried to fix this problem, and fortunately the fix is simple
>> with the 1-liner patch.
>> It does exactly the same thing that we recently did to hide
>> overly long grep command lines with 'grep-find-abbreviate'.
>> The patch even uses the same 'grep-find-abbreviate-properties'
>> to allow clicking the hidden part to expand it.
>> diff --git a/lisp/progmodes/grep.el b/lisp/progmodes/grep.el
>> index dafba22f77..e0df2402ee 100644
>> --- a/lisp/progmodes/grep.el
>> +++ b/lisp/progmodes/grep.el
>> @@ -492,6 +492,9 @@ grep-mode-font-lock-keywords
>>         (0 grep-context-face)
>>         (1 (if (eq (char-after (match-beginning 1)) ?\0)
>>                `(face nil display ,(match-string 2)))))
>> +     ;; Hide excessive parts of grep output lines
>> +     ("^.+?:.\\{,64\\}\\(.*\\).\\{10\\}$"
>> +      1 grep-find-abbreviate-properties)
>>        ;; Hide excessive part of rgrep command
>>        ("^find \\(\\. -type d .*\\\\)\\)"
>>         (1 (if grep-find-abbreviate grep-find-abbreviate-properties
>>
>> More customizability could be added later to define the
>> length of the hidden part, etc.
>
> Maybe we'll want it to be dynamically determined by fill-column.
>
> Or just be a big enough value (e.g. 256) that the only lines where this
> rule is hit are obviously too long.

Or maybe determined by the frame width.

This will avoid the need of using such workarounds as in bug#44941:

grep -a "$@" | cut -c -200





^ permalink raw reply	[flat|nested] 57+ messages in thread

end of thread, other threads:[~2022-05-01 17:14 UTC | newest]

Thread overview: 57+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-12-01  8:45 bug#44983: Truncate long lines of grep output Juri Linkov
2020-12-01 15:02 ` Dmitry Gutov
2020-12-01 16:09   ` Eli Zaretskii
2020-12-01 16:46     ` Andreas Schwab
2020-12-01 18:26       ` Eli Zaretskii
2020-12-01 20:35     ` Juri Linkov
2020-12-02  3:21       ` Eli Zaretskii
2020-12-02  9:35         ` Juri Linkov
2020-12-02 10:28           ` Eli Zaretskii
2020-12-02 20:53             ` Juri Linkov
2020-12-03 14:47               ` Eli Zaretskii
2020-12-03 16:30                 ` Rudolf Schlatte
2020-12-03 21:17                 ` Juri Linkov
2020-12-05 19:47                   ` Juri Linkov
2020-12-06 20:39                     ` Juri Linkov
2020-12-06 21:37                       ` Dmitry Gutov
2020-12-06 21:54                         ` Juri Linkov
2020-12-07  2:41                           ` Dmitry Gutov
2020-12-08 19:41                             ` Juri Linkov
2020-12-09  3:00                               ` Dmitry Gutov
2020-12-09 19:17                                 ` Juri Linkov
2020-12-09 20:06                                   ` Dmitry Gutov
2020-12-10  8:18                                     ` Juri Linkov
2020-12-10 20:48                                       ` Dmitry Gutov
2020-12-09 21:43                                   ` Jean Louis
2020-12-10  8:06                                     ` Juri Linkov
2020-12-10 10:08                                       ` Jean Louis
2020-12-12 20:42                                         ` Juri Linkov
2020-12-13 10:57                                           ` Jean Louis
2020-12-13 15:11                                           ` Eli Zaretskii
2020-12-13 15:37                                             ` Jean Louis
2020-12-13 20:17                                             ` Juri Linkov
2020-12-14 16:15                                               ` Eli Zaretskii
2020-12-14 20:09                                                 ` Dmitry Gutov
2020-12-24 20:33                                   ` Juri Linkov
2020-12-24 23:38                                     ` Dmitry Gutov
2020-12-08  5:35                         ` Richard Stallman
2020-12-08 19:15                           ` Dmitry Gutov
2022-04-29 11:39           ` Lars Ingebrigtsen
2022-04-29 12:22             ` Eli Zaretskii
2022-04-29 12:41               ` Lars Ingebrigtsen
2022-04-29 13:08                 ` Eli Zaretskii
2022-04-30  9:24                   ` Lars Ingebrigtsen
2022-04-30  9:36                     ` Lars Ingebrigtsen
2022-04-30 10:15                       ` Eli Zaretskii
2022-04-30 11:04                         ` Lars Ingebrigtsen
2022-04-29 16:02             ` Dmitry Gutov
2022-04-30  9:40               ` Lars Ingebrigtsen
2022-04-30  9:56                 ` Lars Ingebrigtsen
2022-04-30 10:09                   ` Eli Zaretskii
2022-04-30 10:59                     ` Lars Ingebrigtsen
2022-04-30 11:02                     ` Lars Ingebrigtsen
2022-04-30 11:12                       ` Eli Zaretskii
2022-04-29 17:15             ` Juri Linkov
2022-04-30  0:27               ` Dmitry Gutov
2022-05-01 17:14                 ` Juri Linkov
2020-12-01 20:34   ` Juri Linkov

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