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--check doesn't print to stderr as the documentation says #1429

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tdhopper opened this issue Aug 28, 2020 · 4 comments · Fixed by #1435
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--check doesn't print to stderr as the documentation says #1429

tdhopper opened this issue Aug 28, 2020 · 4 comments · Fixed by #1435
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@sztamas
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bug Something isn't working documentation Improvements or additions to documentation
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5.5.0

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@tdhopper
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I believe I'm correct that running --check prints the required changes to stdout despite what the README says.
@timothycrosley timothycrosley added bug Something isn't working documentation Improvements or additions to documentation labels Aug 29, 2020
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timothycrosley commented Aug 29, 2020 •
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Hi @tdhopper!

Thanks for pointing out the inconsistency! I did some digging to see why this was, and it looks like originally it did print to stderr, and then intentionally was changed (here: be10c4a) as a result of the discussion here: #156. .

Personally, looking back on it, I think the wrong course of action was taking and that errors (and only the errors) should have been sent to stderr and the documentation should be made consist, I'll take the opportunity in the next minor release to fix this behaviour.

Thanks for shedding light on a ~6 year old bug that's probably caused confusion for many!

~Timothy

@timothycrosley timothycrosley added this to the 5.5.0 milestone Aug 29, 2020
@sztamas sztamas self-assigned this Aug 31, 2020
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sztamas commented Aug 31, 2020

I already noticed this inconsistency when added the colored output code, but didn't want to break backward compatibility and left a TODO to make the changes later on.

I haven't noticed that the documentation say we should print to stderr already, which gives us the option of treating this as a bugfix and fix it right away.

sztamas added a commit that referenced this issue Aug 31, 2020
@sztamas
Print errors to stderr.
edd3aa0 
Fixes #1429
@sztamas sztamas mentioned this issue Aug 31, 2020
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This change has just been deployed to PyPI in version 5.5.0

Thanks!

~Timothy

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tdhopper commented Sep 3, 2020

Thanks for jumping on it!

jparise added a commit to pinterest/arcanist-linters that referenced this issue Sep 3, 2020
@jparise
Update diff parsing for isort 5.5+
b363f04 
PyCQA/isort#1429 fixed `--check`'s output so
that the error message and diff output are separated into STDERR and
STDOUT rather than combined in STDOUT. This means we need to update our
diff parsing function accordingly.

Also fix the version parsing routine to read from STDOUT. This was
busted for at least a few versions.
@jparise jparise mentioned this issue Sep 3, 2020
Merged
jparise added a commit to pinterest/arcanist-linters that referenced this issue Sep 3, 2020
@jparise
Update diff parsing for isort 5.5+ (#49)
4963ba2 
PyCQA/isort#1429 fixed --check's output so
that the error message and diff output are separated into STDERR and
STDOUT rather than combined in STDOUT. This means we need to update our
diff parsing function accordingly.

Also fix the version parsing routine to read from STDOUT. This was
busted for at least a few versions.
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Print errors to stderr. PyCQA/isort
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@tdhopper @sztamas @timothycrosley