GNU bug report logs - #33123
ls: add case-sensitive --color option

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Package: coreutils; Severity: wishlist; Reported by: Matt Martini <matt.martini@HIDDEN>; dated Tue, 23 Oct 2018 03:46:02 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.

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Subject: Re: bug#33123: ls: add case-sensitive --color option
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To: Mikael Magnusson <mikachu@HIDDEN>, 33123 <at> debbugs.gnu.org
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On 10/05/2022 09:45, Mikael Magnusson wrote:
> Hi,
> 
> In bug #9086 [1] there was a lot of good discussion about case
> insensitive matching for dircolors. This was all then summarily
> ignored in [2] which made the behaviour unconditional. This breaks
> coloring of uppercase files that should have a different color from
> lowercase files, for example .C which is a c++ source file, not a c
> source file. And as mentioned in [1] it is also very useful to notice
> incorrectly (eg uppercase extension files) quickly by them being
> white, so you can fix them.
> 
> I'm not sure if the suggestion in this bug (33123) is good though;
> since ls --color=auto-case will just error on older releases, you
> can't easily sync your aliases. Unfortunately ls also ignores all of
> LS_COLORS if it contains any unknown values (why??) so we can't add a
> "CS" field there for case sensitiveness either (unless there's some
> extra options field already I don't know about?).
> 
> If anyone has some ideas I would be happy to produce a patch (assuming
> you don't need copyright assignment).
> 
> [1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=9086
> [2] https://lists.gnu.org/archive/html/coreutils/2018-06/msg00011.html

Thanks for taking the time to tie all these threads together.

Yes we forgot about [1] when implementing [2].

The ideas in [1] are sound. I.e. we shouldn't need a new option.
We just need to honor any capitalized extension entries,
and fall back to case insensitive for lower case extensions.
We do need to be cognizant of performance though.
We could sort the list of extensions, which would auto give
precedence to capitalized entries, and we might also use that
sorting to break out of the match loop early.

I'll look at this soon.

cheers,
Pádraig
Information forwarded to bug-coreutils@HIDDEN:
bug#33123; Package coreutils. Full text available.

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From: Mikael Magnusson <mikachu@HIDDEN>
Date: Tue, 10 May 2022 10:45:37 +0200
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Subject: ls: add case-sensitive --color option
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Hi,

In bug #9086 [1] there was a lot of good discussion about case
insensitive matching for dircolors. This was all then summarily
ignored in [2] which made the behaviour unconditional. This breaks
coloring of uppercase files that should have a different color from
lowercase files, for example .C which is a c++ source file, not a c
source file. And as mentioned in [1] it is also very useful to notice
incorrectly (eg uppercase extension files) quickly by them being
white, so you can fix them.

I'm not sure if the suggestion in this bug (33123) is good though;
since ls --color=auto-case will just error on older releases, you
can't easily sync your aliases. Unfortunately ls also ignores all of
LS_COLORS if it contains any unknown values (why??) so we can't add a
"CS" field there for case sensitiveness either (unless there's some
extra options field already I don't know about?).

If anyone has some ideas I would be happy to produce a patch (assuming
you don't need copyright assignment).

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=9086
[2] https://lists.gnu.org/archive/html/coreutils/2018-06/msg00011.html

-- 
Mikael Magnusson
Information forwarded to bug-coreutils@HIDDEN:
bug#33123; Package coreutils. Full text available.
Changed bug title to 'ls: add case-sensitive --color option' from 'ls-quotes: non-backwards compatible change to ls' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Severity set to 'wishlist' from 'normal' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Changed bug title to 'ls-quotes: non-backwards compatible change to ls' from 'non-backwards compatible change to ls' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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There was a change in the behavior of ls that is unconditional (no
way to revert to the old behavior) and incompatible with the
previous behavior.

The change is listed in the Changelog for 8.30:

2018-06-20  Kaxandra Labat  <kaxandra.labat@HIDDEN>
 ls: ignore case when coloring file extensions
   * src/ls.c (get_color_indicator): s/STREQ_LEN/c_strncasecmp/
   * src/dircolors.hin: Remove a now redundant entry.
   * tests/ls/color-ext.sh: Add a new test.
   * tests/local.mk: Reference the new test.
   * NEWS: Mention the change in behavior.

This breaks the use case where different colors are assigned to suffixes
whose case is different. The old behavior allowed for making visually
distinct different cased suffixes.

For example:

    image.jpg    could be rendered in green
    image.JPG    could be rendered in green with a yellow background=20

This would allow for easy identification of non-uniform cases,
especially in directories with large numbers of files.

What I am requesting is a way to get the old behavior back.=20

One suggestion would be adding a setting to the =E2=80=94color option, =
whereby

    --color=3Dauto				would turn on =
colorization case-insensitive (as the new behavior works)
    --color=3Dauto-case		would turn on colorization =
case-sensitive (as the old behavior worked)

Thank you.

Matt=

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div class=3D""><div class=3D"">There was a change in the =
behavior of ls that is unconditional (no</div><div class=3D"">way to =
revert to the old behavior) and incompatible with the</div><div =
class=3D"">previous behavior.</div><div class=3D""><br =
class=3D""></div></div><div class=3D"">The change is listed in the =
Changelog for 8.30:</div><div class=3D""><br class=3D""></div><div =
class=3D""><font face=3D"Courier" class=3D"">2018-06-20 &nbsp;Kaxandra =
Labat &nbsp;&lt;<a href=3D"mailto:kaxandra.labat@HIDDEN" =
class=3D"">kaxandra.labat@HIDDEN</a>&gt;</font></div><div =
class=3D""><div class=3D""><font face=3D"Courier" class=3D"">&nbsp;ls: =
ignore case when coloring file extensions</font></div><div =
class=3D""><font face=3D"Courier" class=3D"">&nbsp; &nbsp;* src/ls.c =
(get_color_indicator): s/STREQ_LEN/c_strncasecmp/</font></div><div =
class=3D""><font face=3D"Courier" class=3D"">&nbsp; &nbsp;* =
src/dircolors.hin: Remove a now redundant entry.</font></div><div =
class=3D""><font face=3D"Courier" class=3D"">&nbsp; &nbsp;* =
tests/ls/color-ext.sh: Add a new test.</font></div><div class=3D""><font =
face=3D"Courier" class=3D"">&nbsp; &nbsp;* tests/local.mk: Reference the =
new test.</font></div><div class=3D""><font face=3D"Courier" =
class=3D"">&nbsp; &nbsp;* NEWS: Mention the change in =
behavior.</font></div></div><div class=3D""><br class=3D""></div><div =
class=3D""><div class=3D"">This breaks the use case where different =
colors are assigned to suffixes</div><div class=3D"">whose case is =
different. The old behavior allowed for making visually</div><div =
class=3D"">distinct different cased suffixes.</div></div><div =
class=3D""><br class=3D""></div><div class=3D"">For example:</div><div =
class=3D""><br class=3D""></div><div class=3D"">&nbsp; &nbsp; <font =
face=3D"Courier" class=3D"">image.jpg</font> &nbsp; &nbsp;could be =
rendered in green</div><div class=3D"">&nbsp; &nbsp; <font =
face=3D"Courier" class=3D"">image.JPG</font>&nbsp; &nbsp; could be =
rendered in green with a yellow background&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D""><div class=3D"">This would allow for =
easy identification of non-uniform cases,</div><div class=3D"">especially =
in directories with large numbers of files.</div><div class=3D""><br =
class=3D""></div><div class=3D"">What I am requesting is a way to get =
the old behavior back.&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">One suggestion would be adding a =
setting to the <font face=3D"Courier" class=3D"">=E2=80=94color</font> =
option, whereby</div></div><div class=3D""><br class=3D""></div><div =
class=3D"">&nbsp; &nbsp;&nbsp;<font face=3D"Courier" =
class=3D"">--color=3Dauto</font><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">				</span>would =
turn on colorization case-insensitive (as the new behavior =
works)</div><div class=3D"">&nbsp; &nbsp;&nbsp;<font face=3D"Courier" =
class=3D"">--color=3Dauto-case</font><span class=3D"Apple-tab-span" =
style=3D"white-space: pre;">		</span>would turn on =
colorization case-sensitive (as the old behavior worked)</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thank you.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Matt</div></body></html>=

--Apple-Mail=_92E458B0-F90A-4EC7-B472-8710B3A6E553--
Acknowledgement sent to Matt Martini <matt.martini@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#33123; Package coreutils. Full text available.
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