Re: [PATCH v4] log,diff-tree: add --combined-all-names option

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Elijah Newren <newren@xxxxxxxxx> writes:

There is one place that says combined-all-paths, and everywhere else
it says combined-all-names.  The former is probably techincally more
correct, I think ;-)

> The combined diff format for merges will only list one filename, even if
> rename or copy detection is active.  For example, with raw format one
> might see:
>
>   ::100644 100644 100644 fabadb8 cc95eb0 4866510 MM	describe.c
>   ::100755 100755 100755 52b7a2d 6d1ac04 d2ac7d7 RM	bar.sh
>   ::100644 100644 100644 e07d6c5 9042e82 ee91881 RR	phooey.c
>
> This doesn't let us know what the original name of bar.sh was in the
> first parent, and doesn't let us know what either of the original names
> of phooey.c were in either of the parents.  In contrast, for non-merge
> commits, raw format does provide original filenames (and a rename score
> to boot).  In order to also provide original filenames for merge
> commits, add a --combined-all-names option (which must be used with
> either -c or --cc, and is likely only useful with rename or copy
> detection active) so that we can print tab-separated filenames when
> renames are involved.  This transforms the above output to:
>
>   ::100644 100644 100644 fabadb8 cc95eb0 4866510 MM	desc.c	desc.c	desc.c
>   ::100755 100755 100755 52b7a2d 6d1ac04 d2ac7d7 RM	foo.sh	bar.sh	bar.sh
>   ::100644 100644 100644 e07d6c5 9042e82 ee91881 RR	fooey.c	fuey.c	phooey.c
>
> Further, in patch format, this changes the from/to headers so that
> instead of just having one "from" header, we get one for each parent.
> For example, instead of having
>
>   --- a/phooey.c
>   +++ b/phooey.c
>
> we would see
>
>   --- a/fooey.c
>   --- a/fuey.c
>   +++ b/phooey.c

Do we have the three "rename from fooey.c", "rename from fuey.c" and
"rename to "phooey.c" extended headers, too?  That's what I meant in
my response, but I do like what I see in the above example ;-)

> -. single path, only for "dst"
> +. tab-separated pathname(s) of the file
>  
> -Example:
> +For `-c` and `--cc`, only the destination or final path is shown even
> +if the file was renamed on any side of history.  With
> +`--combined-all-names`, the name of the path in each parent is shown
> +followed by the name of the path in the merge commit.
> +
> +Examples for `-c` and `-cc` without `--combined-all-names`:
> +------------------------------------------------
> +::100644 100644 100644 fabadb8 cc95eb0 4866510 MM	desc.c
> +::100755 100755 100755 52b7a2d 6d1ac04 d2ac7d7 RM	bar.sh
> +::100644 100644 100644 e07d6c5 9042e82 ee91881 RR	phooey.c
> +------------------------------------------------
> +
> +Examples when `--combined-all-names` added to either `-c` or `--cc`:



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