git/Documentation/git-shortlog.txt
Taylor Blau 3dc95e09e1 shortlog: support arbitrary commit format --groups
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>
2022-10-24 14:48:05 -07:00

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git-shortlog(1)
===============
NAME
----
git-shortlog - Summarize 'git log' output
SYNOPSIS
--------
[verse]
'git shortlog' [<options>] [<revision-range>] [[--] <path>...]
git log --pretty=short | 'git shortlog' [<options>]
DESCRIPTION
-----------
Summarizes 'git log' output in a format suitable for inclusion
in release announcements. Each commit will be grouped by author and title.
Additionally, "[PATCH]" will be stripped from the commit description.
If no revisions are passed on the command line and either standard input
is not a terminal or there is no current branch, 'git shortlog' will
output a summary of the log read from standard input, without
reference to the current repository.
OPTIONS
-------
-n::
--numbered::
Sort output according to the number of commits per author instead
of author alphabetic order.
-s::
--summary::
Suppress commit description and provide a commit count summary only.
-e::
--email::
Show the email address of each author.
--format[=<format>]::
Instead of the commit subject, use some other information to
describe each commit. '<format>' can be any string accepted
by the `--format` option of 'git log', such as '* [%h] %s'.
(See the "PRETTY FORMATS" section of linkgit:git-log[1].)
Each pretty-printed commit will be rewrapped before it is shown.
--date=<format>::
Show dates formatted according to the given date string. (See
the `--date` option in the "Commit Formatting" section of
linkgit:git-log[1]). Useful with `--group=format:<format>`.
--group=<type>::
Group commits based on `<type>`. If no `--group` option is
specified, the default is `author`. `<type>` is one of:
+
--
- `author`, commits are grouped by author
- `committer`, commits are grouped by committer (the same as `-c`)
- `trailer:<field>`, the `<field>` is interpreted as a case-insensitive
commit message trailer (see linkgit:git-interpret-trailers[1]). For
example, if your project uses `Reviewed-by` trailers, you might want
to see who has been reviewing with
`git shortlog -ns --group=trailer:reviewed-by`.
- `format:<format>`, any string accepted by the `--format` option of
'git log'. (See the "PRETTY FORMATS" section of
linkgit:git-log[1].)
+
Note that commits that do not include the trailer will not be counted.
Likewise, commits with multiple trailers (e.g., multiple signoffs) may
be counted more than once (but only once per unique trailer value in
that commit).
+
Shortlog will attempt to parse each trailer value as a `name <email>`
identity. If successful, the mailmap is applied and the email is omitted
unless the `--email` option is specified. If the value cannot be parsed
as an identity, it will be taken literally and completely.
--
+
If `--group` is specified multiple times, commits are counted under each
value (but again, only once per unique value in that commit). For
example, `git shortlog --group=author --group=trailer:co-authored-by`
counts both authors and co-authors.
-c::
--committer::
This is an alias for `--group=committer`.
-w[<width>[,<indent1>[,<indent2>]]]::
Linewrap the output by wrapping each line at `width`. The first
line of each entry is indented by `indent1` spaces, and the second
and subsequent lines are indented by `indent2` spaces. `width`,
`indent1`, and `indent2` default to 76, 6 and 9 respectively.
+
If width is `0` (zero) then indent the lines of the output without wrapping
them.
<revision-range>::
Show only commits in the specified revision range. When no
<revision-range> is specified, it defaults to `HEAD` (i.e. the
whole history leading to the current commit). `origin..HEAD`
specifies all the commits reachable from the current commit
(i.e. `HEAD`), but not from `origin`. For a complete list of
ways to spell <revision-range>, see the "Specifying Ranges"
section of linkgit:gitrevisions[7].
[--] <path>...::
Consider only commits that are enough to explain how the files
that match the specified paths came to be.
+
Paths may need to be prefixed with `--` to separate them from
options or the revision range, when confusion arises.
:git-shortlog: 1
include::rev-list-options.txt[]
MAPPING AUTHORS
---------------
See linkgit:gitmailmap[5].
Note that if `git shortlog` is run outside of a repository (to process
log contents on standard input), it will look for a `.mailmap` file in
the current directory.
GIT
---
Part of the linkgit:git[1] suite