bug#70507: 30.0.50; eshell: grep -H and -n flags are hardcoded and the latter cannot be overwritten

bug#70507: 30.0.50; eshell: grep -H and -n flags are hardcoded and the latter cannot be overwritten

[Jose A Ortega Ruiz]

Hi,

I've noticed that -Hn flags are hardcoded when calling eshell's grep
command. Specially in pipes, where -H prints a noisy (standard input)
prefix for every line, those flags are rarely what I personally want,
and I'd like to have the option to disable them. For -H i can add -h to
the call, or even redefine eshell/grep to not use -H, but there's no
flag to disable -n.

Thanks!


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-- 
Ignorance more frequently begets confidence than does knowledge
  - Charles Darwin

bug#70507: 30.0.50; eshell: grep -H and -n flags are hardcoded and the latter cannot be overwritten

[Stefan Kangas]

Jose A Ortega Ruiz <jao@gnu.org> writes:

> Hi,
>
> I've noticed that -Hn flags are hardcoded when calling eshell's grep
> command. Specially in pipes, where -H prints a noisy (standard input)
> prefix for every line, those flags are rarely what I personally want,
> and I'd like to have the option to disable them. For -H i can add -h to
> the call, or even redefine eshell/grep to not use -H, but there's no
> flag to disable -n.
>
> Thanks!

Jim, any comments on the above bug report?

Thanks.

bug#70507: 30.0.50; eshell: grep -H and -n flags are hardcoded and the latter cannot be overwritten

[Jim Porter]

On 5/20/2024 1:18 PM, Stefan Kangas wrote:
> Jose A Ortega Ruiz <jao@gnu.org> writes:
> 
>> I've noticed that -Hn flags are hardcoded when calling eshell's grep
>> command. Specially in pipes, where -H prints a noisy (standard input)
>> prefix for every line, those flags are rarely what I personally want,
>> and I'd like to have the option to disable them. For -H i can add -h to
>> the call, or even redefine eshell/grep to not use -H, but there's no
>> flag to disable -n.
> 
> Jim, any comments on the above bug report?

It would probably be reasonable to define some new 
'eshell-grep-default-interactive-flags' variable, defaulting to "-nH" 
and only taking effect when being redirected to a compilation buffer. 
Maybe 'eshell-compile' could also take an EXTRA-ARGS argument that holds 
extra args to use. There are a few edge cases here I haven't fully 
though through, so maybe this is all wrong.

In the short term though, you have a few options:

1. "alias grep '*grep $@*'": This just makes "grep" always use the real 
"grep" program on your computer, with no fancy compilation buffers.

2. "alias grep 'compile --mode=grep-mode grep $@*'": This ensures that 
"grep" opens in a compilation buffer when called interactively (and not 
in a pipeline, etc), but only with the flags you explicitly specify.

bug#70507: 30.0.50; eshell: grep -H and -n flags are hardcoded and the latter cannot be overwritten

[jao]

On Mon, May 20 2024, Jim Porter wrote:

> On 5/20/2024 1:18 PM, Stefan Kangas wrote:
>> Jose A Ortega Ruiz <jao@gnu.org> writes:
>>
>>> I've noticed that -Hn flags are hardcoded when calling eshell's grep
>>> command. Specially in pipes, where -H prints a noisy (standard input)
>>> prefix for every line, those flags are rarely what I personally want,
>>> and I'd like to have the option to disable them. For -H i can add -h to
>>> the call, or even redefine eshell/grep to not use -H, but there's no
>>> flag to disable -n.
>>
>> Jim, any comments on the above bug report?
>
> It would probably be reasonable to define some new
> 'eshell-grep-default-interactive-flags' variable, defaulting to "-nH"
> and only taking effect when being redirected to a compilation buffer.
> Maybe 'eshell-compile' could also take an EXTRA-ARGS argument that holds
> extra args to use. There are a few edge cases here I haven't fully
> though through, so maybe this is all wrong.
>
> In the short term though, you have a few options:
>
> 1. "alias grep '*grep $@*'": This just makes "grep" always use the real
> "grep" program on your computer, with no fancy compilation buffers.
>
> 2. "alias grep 'compile --mode=grep-mode grep $@*'": This ensures that
> "grep" opens in a compilation buffer when called interactively (and not
> in a pipeline, etc), but only with the flags you explicitly specify.

Thanks for your feedback. For my use cases, solution 2 is probably
covering all the bases.

Cheers,
jao
-- 
“I’m all these words, all these strangers, this dust of words, with no
ground for their setting, no sky for their dispersing.”
 - Samuel Beckett, The Unnamable