[nSLUG] Any Perl Experience around?

Joel Maxuel j.maxuel at gmail.com
Thu Jun 22 17:45:53 ADT 2017

Interestingly enough (on my system), comparing the last two examples to one
previous to that, it's the last two examples that have indenting issues
whereas the one previous does not.  The `column` command may have been
fixed in Debian Stretch for that matter (the version I am running) to
render colourization.  For chuckles, I also tried with the GNU Autogen's
Columns command, and decided to not mess with a good thing.

This is relevant for others:

The final side effect is that a few colourized files are truncated 7
characters shorter than their peers (first half of second line)...

bitware-lite-3.22-01...    bitware-lite-3.22-01...    blankdisk.img
budget - 2014...    BudgetDBFront...    budget - last 12mo.p...    budget -
last year.p...
Build/            camera2.log        camera.log        camshite

But I am not concerned about that.

Hatem, do you have a github account?  If you like I can attribute you in
this work in the commit message for my cli tools project (I usually use the
format of "First and Last Name (GithubAccountName)").  Thanks once again.

Joel Maxuel

"One should strive to achieve, not sit in bitter regret."
 - Ronan Harris / Mark Jackson

On Thu, Jun 22, 2017 at 1:27 PM, Hatem Nassrat <hnassrat at gmail.com> wrote:

> On Thu, Jun 22, 2017 at 12:46 PM, Hatem Nassrat <hnassrat at gmail.com>
> wrote:
>> Your problem is most likely with the column command. Also this is a long
>> explanation to say my regex is solid :P
> Here is a version of the command that works, it essentially adds 10 spaces
> on lines that have colors, (counted by looking at the file in vim, without
> the initial escape character, each colored line has 10 characters of color
> stuff). This means that your columnar output is now 10 chars longer, so you
> need to consider that in your char count inside the curly brackets inside.
> Essentially none colored file names are penalized ... what can be done
> there is a slightly more complex regex where the non colored lines are
> allowed an extra 10 characters from their colored counterparts. Both below.
> /bin/ls -Fc --color | perl -lne 's/((?:\e\[\d+(?:;\d+)?m)*)([^
> \e]{24})[^\e]*(.*)/$1$2...$3/s; print' | column -x | perl -lne
> 's/(\e\[0m[^\t]*)(\t)/$1          $2/sg; print'
> OR
> # note I made the length 5 and 15 for testing, changing it to 24 and 34
> should match the original github code size for the 2 col version
> /bin/ls -Fc --color | perl -lne 's/(?:((?:\e\[\d+(?:;\d+)?m)+)
> ([^\e]{5})[^\e]*(.*))|(?:(.{15}).*)/$1$2$4...$3/s; print' | column -x |
> perl -lne 's/(\e\[0m[^\t]*)(\t)/$1          $2/sg; print'
> --
> Hatem
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