Re: git diff: print hunk numbers?

[Aleksey Midenkov <midenok@gmail.com>]

On Thu, Sep 9, 2021 at 12:39 AM Jeff King <peff@peff.net> wrote:
>
> On Wed, Sep 08, 2021 at 11:40:20PM +0300, Aleksey Midenkov wrote:
>
> > Is that possible/how to print hunk numbers with git diff?
> >
> > F.ex. instead of:
> >
> > @@ -106,7 +110,6 @@ while ($r < $statement_count)
> > ...
> >
> > To print something like:
> >
> > @@ -106,7 +110,6 @@ 4 @@ while ($r < $statement_count)
> > ...
> >
> > filterdiff uses hunk numbers intensively. Work with line-number ranges
> > is not so effective.
>
> No, Git doesn't know how to do any annotations on hunk lines (aside from
> finding and reporting the funcname lines from the source). So you'd have
> to post-process it, like:
>
>   git diff ... |
>   perl -pe 's/^@@.*?@@/join(" ", $&, ++$i, "@@")/e'
>
> but I'm not sure if that's quite what you're after. If you're using
> filterdiff to pick out hunks, then piping through "filterdiff
> --annotate" does something similar.
>
> If you want to post-process your diffs all the time, you can do
> something like:
>
>   git config pager.color false
>   git config pager.diff 'filterdiff --annotate | less'
>

Thanks!

 git config pager.color false
 git config pager.diff 'filterdiff --annotate | colordiff | less -FRX'
 git config pager.show 'filterdiff --annotate | colordiff | less -FRX'

did the job for me.

> to show the annotations anytime the output is going to a terminal.
> Though sadly filterdiff does not handle the colors; other
> post-processors like diff-highlight parse around them.
>
> And finally, if your ultimate goal is to use filterdiff to pick out
> hunks, you might find using Git's picking tools like "checkout -p"
> easier. Even if you are starting with an actual patch, you can apply it
> and then pick out bits, like:
>
>   git checkout --detach ;# temporary head for applying patch
>   git apply </path/to/patch
>   git commit -m "temporary commit for patch"
>   git checkout - ;# back to the original branch
>   git checkout -p HEAD@{1} ;# now selectively grab parts
>
> Of course that only helps if the patch actually applies. If your goal is
> to filter out hunks that don't apply, it won't help. :)
>
> -Peff

-- 
@midenok