While at it add git-interpret-trailers to "command-list.txt".

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 Documentation/git-interpret-trailers.txt | 143 +++++++++++++++++++++++++++++++
 command-list.txt                         |   1 +
 2 files changed, 144 insertions(+)
 create mode 100644 Documentation/git-interpret-trailers.txt

diff --git a/Documentation/git-interpret-trailers.txt 
b/Documentation/git-interpret-trailers.txt
new file mode 100644
index 0000000..450ec54
--- /dev/null
+++ b/Documentation/git-interpret-trailers.txt
@@ -0,0 +1,143 @@
+git-interpret-trailers(1)
+=========================
+
+NAME
+----
+git-interpret-trailers - help add stuctured information into commit messages
+
+SYNOPSIS
+--------
+[verse]
+'git interpret-trailers' [--trim-empty] [(--trailer <token>[(=|:)<value>])...] 
[<file>...]
+
+DESCRIPTION
+-----------
+Help adding 'trailers' lines, that look similar to RFC 822 e-mail
+headers, at the end of the otherwise free-form part of a commit
+message.
+
+This command reads some patches or commit messages from either the
+<file> arguments or the standard input if no <file> is specified. Then
+this command applies the arguments passed using the `--trailer`
+option, if any, to the commit message part of each input file. The
+result is emitted on the standard output.
+
+Some configuration variables control the way the `--trailer` arguments
+are applied to each commit message and the way any existing trailer in
+the commit message is changed. They also make it possible to
+automatically add some trailers.
+
+By default, a '<token>=<value>' or '<token>:<value>' argument given
+using `--trailer` will be added only if no trailer with the same
+(<token>, <value>) pair is already in the message. The <token> and
+<value> parts will be trimmed to remove starting and trailing
+whitespace, and the resulting trimmed <token> and <value> will appear
+in the message like this:
+
+------------------------------------------------
+token: value
+------------------------------------------------
+
+By default, if there are already trailers with the same <token>, the
+new trailer will appear just after the last trailer with the same
+<token>. Otherwise it will appear at the end of the message.
+
+The trailers are recognized in the input commit message using the
+following rules:
+
+* only lines that contains a ':' are considered trailers,
+* the trailer lines must all be next to each other,
+* after them it's only possible to have some lines that contain only spaces,
+* before them there must be at least one line with only spaces.
+
+Note that 'trailers' do not follow and are not intended to follow many
+rules for RFC 822 headers. For example they do not follow the line
+folding rules, the encoding rules and probably many other rules.
+
+OPTIONS
+-------
+--trim-empty::
+       If the <value> part of any trailer contains only whitespace,
+       the whole trailer will be removed from the resulting message.
+       This apply to existing trailers as well as new trailers.
+
+--trailer <token>[(=|:)<value>]::
+       Specify a (<token>, <value>) pair that should be applied as a
+       trailer to the input messages. See the description of this
+       command.
+
+CONFIGURATION VARIABLES
+-----------------------
+
+trailer.<token>.key::
+       This `key` will be used instead of <token> in the
+       trailer. After the last alphanumeric character, it can contain
+       some non alphanumeric characters like ':', '=' or '#' that
+       will be used instead of ':' to separate the <token> from the
+       <value> in the trailer, though the default ':' is more
+       standard.
+
+trailer.<token>.where::
+       This can be either `after`, which is the default, or
+       `before`. If it is `before`, then a trailer with the specified
+       <token>, will appear before, instead of after, other trailers
+       with the same <token>, or otherwise at the beginning, instead
+       of at the end, of all the trailers.
+
+trailer.<token>.ifexist::
+       This option makes it possible to choose what action will be
+       performed when there is already at least one trailer with the
+       same <token> in the message.
++
+The valid values for this option are: `addIfDifferent` (this is the
+default), `addIfDifferentNeighbor`, `add`, `overwrite` or `doNothing`.
++
+With `addIfDifferent`, a new trailer will be added only if no trailer
+with the same (<token>, <value>) pair is already in the message.
++
+With `addIfDifferentNeighbor`, a new trailer will be added only if no
+trailer with the same (<token>, <value>) pair is above or below the line
+where the new trailer will be added.
++
+With `add`, a new trailer will be added, even if some trailers with
+the same (<token>, <value>) pair are already in the message.
++
+With `overwrite`, the new trailer will overwrite an existing trailer
+with the same <token>.
++
+With `doNothing`, nothing will be done; that is no new trailer will be
+added if there is already one with the same <token> in the message.
+
+trailer.<token>.ifmissing::
+       This option makes it possible to choose what action will be
+       performed when there is not yet any trailer with the same
+       <token> in the message.
++
+The valid values for this option are: `add` (this is the default) and
+`doNothing`.
++
+With `add`, a new trailer will be added.
++
+With `doNothing`, nothing will be done.
+
+trailer.<token>.command::
+       This option can be used to specify a shell command that will
+       be used to automatically add or modify a trailer with the
+       specified <token>.
++
+When this option is specified, the behavior is as if a special
+'<token>=<value>' argument were added at the end of the command line,
+where <value> is taken to be the standard output of the specified
+command with any leading and trailing whitespace trimmed off.
++
+If the command contains the `$ARG` string, this string will be
+replaced with the <value> part of an existing trailer with the same
+<token>, if any, before the command is launched.
+
+SEE ALSO
+--------
+linkgit:git-commit[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite
diff --git a/command-list.txt b/command-list.txt
index cf36c3d..d5e0bed 100644
--- a/command-list.txt
+++ b/command-list.txt
@@ -62,6 +62,7 @@ git-imap-send                           foreignscminterface
 git-index-pack                          plumbingmanipulators
 git-init                                mainporcelain common
 git-instaweb                            ancillaryinterrogators
+git-interpret-trailers                  purehelpers
 gitk                                    mainporcelain
 git-log                                 mainporcelain common
 git-ls-files                            plumbinginterrogators
-- 
1.9.1.636.g20d5f34

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