GNU bug report logs - #43016
replace-region-contents takes a lot of time when called from json-pretty-print-buffer

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Package: emacs;

Reported by: ljell <laszlomail <at> protonmail.com>

Date: Mon, 24 Aug 2020 09:26:02 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: ljell <laszlomail <at> protonmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: "43016 <at> debbugs.gnu.org" <43016 <at> debbugs.gnu.org>, Tassilo Horn <tsdh <at> gnu.org>
Subject: bug#43016: replace-region-contents takes a lot of time when called from json-pretty-print-buffer
Date: Mon, 24 Aug 2020 12:29:49 +0000

>
> If you run M-x json-pretty-print-buffer on the already pretty file then it's much faster,so maybe it's related to the single long line generated by json-encode.


The json-encode part was missing in my first post, so the relevant code looks like this:

...
  (with-temp-buffer
    (insert (json-encode data))
    (json-pretty-print-buffer)
    (write-file "data.json"))
...


So I insert json encoded lisp data into a temp buffer and then run prettyfing on it, so the json file is more readable and there are no long lines. This code took a few seconds on 26 and it takes much longer with 27.
This bug report was last modified 4 years and 355 days ago.

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