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shortlog: support arbitrary commit format --groups

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In addition to generating a shortlog based on committer, author, or the
identity in one or more specified trailers, it can be useful to generate
a shortlog based on an arbitrary commit format.

This can be used, for example, to generate a distribution of commit
activity over time, like so:

    $ git shortlog --group='%cd' --date='format:%Y-%m' -s v2.37.0..
       117  2022-06
       274  2022-07
       324  2022-08
       263  2022-09
         7  2022-10

Arbitrary commit formats can be used. In fact, `git shortlog`'s default
behavior (to count by commit authors) can be emulated as follows:

    $ git shortlog --group='%aN <%aE>' ...

and future patches will make the default behavior (as well as
`--committer`, and `--group=trailer:<trailer>`) special cases of the
more flexible `--group` option.

Note also that the SHORTLOG_GROUP_FORMAT enum value is used only to
designate that `--group:<format>` is in use when in stdin mode to
declare that the combination is invalid.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2022-10-24 14:55:39 -04:00
committed by Junio C Hamano
parent b017d3dae9
commit 3dc95e09e1
4 changed files with 78 additions and 2 deletions
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2
shortlog.h
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@@ -22,8 +22,10 @@ struct shortlog {
SHORTLOG_GROUP_AUTHOR = (1 << 0),
SHORTLOG_GROUP_COMMITTER = (1 << 1),
SHORTLOG_GROUP_TRAILER = (1 << 2),
SHORTLOG_GROUP_FORMAT = (1 << 3),
} groups;
struct string_list trailers;
struct string_list format;
int email;
struct string_list mailmap;