mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Heiko Voigt](/assets/img/avatar_default.png)
If the author forgets the gitignore entry the built result will show up as new file in the git working directory. Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
71 lines
2 KiB
Plaintext
71 lines
2 KiB
Plaintext
builtin API
|
|
===========
|
|
|
|
Adding a new built-in
|
|
---------------------
|
|
|
|
There are 4 things to do to add a built-in command implementation to
|
|
git:
|
|
|
|
. Define the implementation of the built-in command `foo` with
|
|
signature:
|
|
|
|
int cmd_foo(int argc, const char **argv, const char *prefix);
|
|
|
|
. Add the external declaration for the function to `builtin.h`.
|
|
|
|
. Add the command to `commands[]` table in `handle_internal_command()`,
|
|
defined in `git.c`. The entry should look like:
|
|
|
|
{ "foo", cmd_foo, <options> },
|
|
+
|
|
where options is the bitwise-or of:
|
|
|
|
`RUN_SETUP`::
|
|
|
|
Make sure there is a git directory to work on, and if there is a
|
|
work tree, chdir to the top of it if the command was invoked
|
|
in a subdirectory. If there is no work tree, no chdir() is
|
|
done.
|
|
|
|
`USE_PAGER`::
|
|
|
|
If the standard output is connected to a tty, spawn a pager and
|
|
feed our output to it.
|
|
|
|
`NEED_WORK_TREE`::
|
|
|
|
Make sure there is a work tree, i.e. the command cannot act
|
|
on bare repositories.
|
|
This only makes sense when `RUN_SETUP` is also set.
|
|
|
|
. Add `builtin-foo.o` to `BUILTIN_OBJS` in `Makefile`.
|
|
|
|
Additionally, if `foo` is a new command, there are 3 more things to do:
|
|
|
|
. Add tests to `t/` directory.
|
|
|
|
. Write documentation in `Documentation/git-foo.txt`.
|
|
|
|
. Add an entry for `git-foo` to `command-list.txt`.
|
|
|
|
. Add an entry for `/git-foo` to `.gitignore`.
|
|
|
|
|
|
How a built-in is called
|
|
------------------------
|
|
|
|
The implementation `cmd_foo()` takes three parameters, `argc`, `argv,
|
|
and `prefix`. The first two are similar to what `main()` of a
|
|
standalone command would be called with.
|
|
|
|
When `RUN_SETUP` is specified in the `commands[]` table, and when you
|
|
were started from a subdirectory of the work tree, `cmd_foo()` is called
|
|
after chdir(2) to the top of the work tree, and `prefix` gets the path
|
|
to the subdirectory the command started from. This allows you to
|
|
convert a user-supplied pathname (typically relative to that directory)
|
|
to a pathname relative to the top of the work tree.
|
|
|
|
The return value from `cmd_foo()` becomes the exit status of the
|
|
command.
|