Re: [PATCH/RFC 0/4] grep: support to match by line number

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On Mon, May 2, 2011 at 18:46, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Bert Wesarg <bert.wesarg@xxxxxxxxxxxxxx> writes:
>
>>> Can you give a concrete example of how you'd use this? I'm not sure I
>>> understand the described use case.
>>
>> I parse the output of compiling a file, there may be warnings or even
>> errors, I collect the given line numbers, and then call 'git grep -p
>> -C -n (-@ <lno>)+ -- <path>' to show me what these warnings are about.
>
> What would you do next after doing that? ÂOpen the file in your editor and
> jump to the line found by the grep? ÂOh, wait, that's the same line as
> your compiler already found for you.

A build run will probably produce many warnings or errors (think of
-j) for many files, so you need to handle more than one file. After
the build run, you get a list of files which have warnings/errors,
selecting one of the files will give you the original messages
including the grep -@ output, from there you can select which message
you want to consider opening in the editor, so grep -@ helps you in
your decision what to open in your editor. If this would all be in a
terminal your original output would be far away anyhow.

I haven't implemented this 'workflow' for the terminal, but for a GUI,
so I can jump to original output easily and open the file in the
editor easily too. Prior to this I did this all on the command line,
but with recursive make this become too cumbersome.

>
> And when you open the file in your editor, doesn't it show offending line
> in the middle of the screen? ÂYou can even fix it up right there. ÂIsn't
> your editor wonderful?
>
> The extra "grep -@" step in-between looks like a totally made-up use case
> that is not interesting nor convincing.
>
>

Visually parsing many warnings/errors of one file by successively
jumping to the offending line in the editor doesn't sound very
productive to me, but having all offending lines with context and
--show-functions in one output does sound.

Bert
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