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From: Roel Janssen <roel@gnu.org>
To: Steve Sprang <steve.sprang@gmail.com>
Cc: 30053@debbugs.gnu.org
Subject: [bug#30053] [PATCH 1/3] Improve appearance of tabular output.
Date: Fri, 12 Jan 2018 14:28:30 +0100	[thread overview]
Message-ID: <87fu7b2old.fsf@gnu.org> (raw)
In-Reply-To: <CA+xn8YDjApPwzx_1kR2pTuwVAyajXO+n5KN27WCGNAF2eX+rDg@mail.gmail.com>


Steve Sprang writes:

> Hi Ludovic,
>
> On Thu, Jan 11, 2018 at 1:32 PM, Ludovic Courtès <ludo@gnu.org> wrote:
>> Long time no see!  ;-)
>
> Yeah, it's been a while!
>
>> I have a disappointing explanation I’m afraid: the reason columns look
>> this way is because they are tab-separated, which in turn makes it easy
>> to filter with ‘cut’:
>>
>> --8<---------------cut here---------------start------------->8---
>> $ guix package -A | cut -f1 | head
>> 0ad
>> 0ad-data
>> 0xffff
>> 4store
>> 4ti2
>> a2ps
>> aalib
>> abbaye
>> abc
>> abcde
>> --8<---------------cut here---------------end--------------->8---
>
> I'm still inserting a tab between columns, so I believe 'cut' still
> works as expected in this case. Initially, I was separating columns
> with a few spaces, but that broke some of the tests that were relying
> on cut, so I switched back to tab.
>
>> An example from the manual (info "(guix) Invoking guix build"):
>>
>>      guix build --quiet --keep-going \
>>        `guix package -A | cut -f1,2 --output-delimiter=@`
>
> Argh, this use case fails because of the extra inserted whitespace.
>
>> The idea was to have this shell-scripting-friendly format, and to
>> provide fancier output in other commands, such as --search (which is in
>> fact script-friendly as well thanks to recutils).
>>
>> Silly? Awesome? Ugly? What do people think?  :-)
>
> Another potential drawback of this patch is that it tends to make
> output lines longer than before. This might make line-wrapping less
> pleasant when using smaller terminal windows/screens.
>
> -Steve

If we use GNU awk instead of cut, I think any whitespace will work:
  $ guix package -A | awk '{ print $1 "@" $2 }'

And then we can optimize the output reading experience for our users
instead of for the 'cut' program.

Kind regards,
Roel Janssen

  reply	other threads:[~2018-01-12 13:30 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-09 22:34 [bug#30053] [PATCH 1/3] Improve appearance of tabular output Steve Sprang
2018-01-09 22:37 ` [bug#30053] [PATCH 2/3] " Steve Sprang
2018-01-09 22:37 ` [bug#30053] [PATCH 3/3] " Steve Sprang
2018-01-11 21:32 ` [bug#30053] [PATCH 1/3] " Ludovic Courtès
2018-01-11 23:32   ` Steve Sprang
2018-01-12 13:28     ` Roel Janssen [this message]
2018-01-13 19:59       ` Steve Sprang
2018-01-16 14:16         ` Ludovic Courtès
2018-01-16 23:56           ` Steve Sprang
2021-07-15  5:39           ` Maxim Cournoyer
2021-07-15 17:36             ` [bug#30053] [PATCH 1/3 v2] " Maxim Cournoyer
2021-07-15 20:15               ` bug#30053: [PATCH 1/3] " Maxim Cournoyer
2021-07-21 16:56               ` [bug#30053] " Ludovic Courtès
2021-07-21 21:43                 ` Maxim Cournoyer
2021-07-15 22:05             ` Sarah Morgensen via Guix-patches via
2021-07-16  1:25               ` Maxim Cournoyer
2018-01-12 14:56   ` Danny Milosavljevic
2018-01-12 15:26     ` Leo Famulari
2018-01-12 15:50       ` bug#30087: "guix package -A" hangs with attached package set Danny Milosavljevic
2020-12-03  0:10         ` zimoun
2020-12-22 16:12           ` zimoun
2021-01-11 12:29             ` zimoun
2018-01-13 13:47       ` [bug#30053] [PATCH 1/3] Improve appearance of tabular output Ludovic Courtès

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