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bug#51037: [PATCH] Make `print-level` & `print-length` customizable in E

From: Andy Moreton
Subject: bug#51037: [PATCH] Make `print-level` & `print-length` customizable in ERT batch tests
Date: Thu, 07 Oct 2021 22:04:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (windows-nt)

On Thu 07 Oct 2021, Lars Ingebrigtsen wrote:

> Eli Zaretskii <eliz@gnu.org> writes:
>> Why do we limit print-length in batch mode?  In interactive session,
>> one can click or type RET on the ellipsis and get it expanded, but no
>> such joy in batch.  See
>>   https://lists.gnu.org/archive/html/emacs-devel/2021-10/msg00395.html
>> for how that makes debugging more difficult than it has to be.
>> So how about using huge values in batch?  Are there any downsides?
> It'll make the error summaries completely unreadable, which isn't what
> you want when doing a "make check" -- you just want to see that there's
> a problem and where it is.  (Well, at least I do.)
> But when making a specific test (i.e., "make subr-tests" etc) it would
> indeed be nice to have untruncated backtraces.  I think adding these new
> variables would allow us to do this.

Isn't that what ert-batch-backtrace-right-margin is for ?

  (defcustom ert-batch-backtrace-right-margin 70
    "Maximum length of lines in ERT backtraces in batch mode.
  Use nil for no limit (caution: backtrace lines can be very long)."
    :type '(choice (const :tag "No truncation" nil) integer))

Also the TEST_BACKTRACE_LINE_LENGTH environment variable can be
used to set it (see test/Makefile.in).


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