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From: Eric S. Raymond <esr@thyrsus.com>
Abstract: This is how-to documentation for people who want to add extension
 commands to Git.  It should be read alongside api-builtin.txt.
Content-type: text/asciidoc

How to integrate new subcommands
================================

This is how-to documentation for people who want to add extension
commands to Git.  It should be read alongside api-builtin.txt.

Runtime environment
-------------------

Git subcommands are standalone executables that live in the Git exec
path, normally /usr/lib/git-core.  The git executable itself is a
thin wrapper that knows where the subcommands live, and runs them by
passing command-line arguments to them.

(If "git foo" is not found in the Git exec path, the wrapper
will look in the rest of your $PATH for it.  Thus, it's possible
to write local Git extensions that don't live in system space.)

Implementation languages
------------------------

Most subcommands are written in C or shell.  A few are written in
Perl.

While we strongly encourage coding in portable C for portability,
these specific scripting languages are also acceptable.  We won't
accept more without a very strong technical case, as we don't want
to broaden the Git suite's required dependencies.  Import utilities,
surgical tools, remote helpers and other code at the edges of the
Git suite are more lenient and we allow Python (and even Tcl/tk),
but they should not be used for core functions.

This may change in the future.  Especially Python is not allowed in
core because we need better Python integration in the Git Windows
installer before we can be confident people in that environment
won't experience an unacceptably large loss of capability.

C commands are normally written as single modules, named after the
command, that link a collection of functions called libgit.  Thus,
your command 'git-foo' would normally be implemented as a single
"git-foo.c" (or "builtin/foo.c" if it is to be linked to the main
binary); this organization makes it easy for people reading the code
to find things.

See the CodingGuidelines document for other guidance on what we consider
good practice in C and shell, and api-builtin.txt for the support
functions available to built-in commands written in C.

What every extension command needs
----------------------------------

You must have a man page, written in asciidoc (this is what Git help
followed by your subcommand name will display).  Be aware that there is
a local asciidoc configuration and macros which you should use.  It's
often helpful to start by cloning an existing page and replacing the
text content.

You must have a test, written to report in TAP (Test Anything Protocol).
Tests are executables (usually shell scripts) that live in the 't'
subdirectory of the tree.  Each test name begins with 't' and a sequence
number that controls where in the test sequence it will be executed;
conventionally the rest of the name stem is that of the command
being tested.

Read the file t/README to learn more about the conventions to be used
in writing tests, and the test support library.

Integrating a command
---------------------

Here are the things you need to do when you want to merge a new
subcommand into the Git tree.

1. Don't forget to sign off your patch!

2. Append your command name to one of the variables BUILTIN_OBJS,
EXTRA_PROGRAMS, SCRIPT_SH, SCRIPT_PERL or SCRIPT_PYTHON.

3. Drop its test in the t directory.

4. If your command is implemented in an interpreted language with a
p-code intermediate form, make sure .gitignore in the main directory
includes a pattern entry that ignores such files.  Python .pyc and
.pyo files will already be covered.

5. If your command has any dependency on a particular version of
your language, document it in the INSTALL file.

6. There is a file command-list.txt in the distribution main directory
that categorizes commands by type, so they can be listed in appropriate
subsections in the documentation's summary command list.  Add an entry
for yours.  To understand the categories, look at git-cmmands.txt
in the main directory.

7. Give the maintainer one paragraph to include in the RelNotes file
to describe the new feature; a good place to do so is in the cover
letter [PATCH 0/n].

That's all there is to it.

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