#ifndef BUILTIN_H
#define BUILTIN_H

#include "git-compat-util.h"
#include "repository.h"

/*
 * 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, struct repository *repo);
 *
 * . Add the external declaration for the function to `builtin.h`.
 *
 * . Add the command to the `commands[]` table defined in `git.c`.
 *   The entry should look like:
 *
 *	{ "foo", cmd_foo, <options> },
 *
 * where options is the bitwise-or of:
 *
 * `RUN_SETUP`:
 *
 *	If there is not a Git directory to work on, abort.  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.
 *
 * `RUN_SETUP_GENTLY`:
 *
 *	If there is a Git directory, chdir as per RUN_SETUP, otherwise,
 *	don't chdir anywhere.
 *
 * `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.
 *
 * `DELAY_PAGER_CONFIG`:
 *
 *	If RUN_SETUP or RUN_SETUP_GENTLY is set, git.c normally handles
 *	the `pager.<cmd>`-configuration. If this flag is used, git.c
 *	will skip that step, instead allowing the built-in to make a
 *	more informed decision, e.g., by ignoring `pager.<cmd>` for
 *	certain subcommands.
 *
 * `NO_PARSEOPT`:
 *
 *	Most Git builtins use the parseopt library for parsing options.
 *	This flag indicates that a custom parser is used and thus the
 *	builtin would not appear in 'git --list-cmds=parseopt'.
 *
 * . Add `builtin/foo.o` to `BUILTIN_OBJS` in `Makefile`.
 *
 * Additionally, if `foo` is a new command, there are 4 more things to do:
 *
 * . Add tests to `t/` directory.
 *
 * . Write documentation in `Documentation/git-foo.adoc`.
 *
 * . Add an entry for `git-foo` to `command-list.txt`.
 *
 * . Add an entry for `/git-foo` to `.gitignore`.
 *
 * As you work on implementing your builtin, be mindful that the
 * following tests will check different aspects of the builtin's
 * readiness and adherence to matching the documentation:
 *
 * * t0012-help.sh checks that the builtin can handle -h, which comes
 *   automatically with the parseopt API.
 *
 * * t0450-txt-doc-vs-help.sh checks that the -h help output matches the
 *   SYNOPSIS in the documentation for the builtin.
 *
 * * t1517-outside-repo.sh checks that the builtin can handle -h when
 *   run outside of the context of a repository. Note that this test
 *   requires that the usage has a space after the builtin name, so some
 *   minimum description of options is required.
 *
 *
 * 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.
 */

extern const char git_usage_string[];
extern const char git_more_info_string[];

/**
 * If a built-in has DELAY_PAGER_CONFIG set, the built-in should call this early
 * when it wishes to respect the `pager.foo`-config. The `cmd` is the name of
 * the built-in, e.g., "foo". If a paging-choice has already been setup, this
 * does nothing. The default in `def` should be 0 for "pager off", 1 for "pager
 * on" or -1 for "punt".
 *
 * You should most likely use a default of 0 or 1. "Punt" (-1) could be useful
 * to be able to fall back to some historical compatibility name.
 */
void setup_auto_pager(const char *cmd, int def);

int is_builtin(const char *s);

/*
 * Builtins which do not use RUN_SETUP should never see
 * a prefix that is not empty; use this to protect downstream
 * code which is not prepared to call prefix_filename(), etc.
 */
#define BUG_ON_NON_EMPTY_PREFIX(prefix) do { \
	if ((prefix)) \
		BUG("unexpected prefix in builtin: %s", (prefix)); \
} while (0)

int cmd_add(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_am(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_annotate(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_apply(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_archive(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_backfill(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_bisect(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_blame(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_branch(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_bugreport(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_bundle(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_cat_file(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_checkout(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_checkout__worker(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_checkout_index(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_check_attr(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_check_ignore(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_check_mailmap(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_check_ref_format(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_cherry(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_cherry_pick(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_clone(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_clean(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_column(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_commit(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_commit_graph(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_commit_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_config(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_count_objects(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_credential(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_credential_cache(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_credential_cache_daemon(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_credential_store(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_describe(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_diagnose(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_diff_files(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_diff_index(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_diff(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_diff_pairs(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_diff_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_difftool(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_env__helper(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fast_export(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fast_import(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fetch(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fetch_pack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_for_each_ref(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_for_each_repo(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_format_patch(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fsck(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_gc(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_grep(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_hash_object(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_help(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_history(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_hook(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_index_pack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_init_db(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_interpret_trailers(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_last_modified(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_log_reflog(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_log(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_ls_files(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_ls_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_ls_remote(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_mailinfo(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_mailsplit(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_maintenance(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge_base(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge_index(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge_ours(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge_file(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge_recursive(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_merge_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_mktag(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_mktree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_multi_pack_index(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_mv(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_name_rev(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_notes(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_pack_objects(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_pack_redundant(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_patch_id(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_prune(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_prune_packed(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_pull(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_push(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_range_diff(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_read_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_rebase(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_rebase__interactive(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_receive_pack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_reflog(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_refs(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_remote(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_remote_ext(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_remote_fd(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_repack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_replay(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_repo(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_rerere(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_reset(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_restore(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_rev_list(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_rev_parse(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_revert(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_rm(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_send_pack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_shortlog(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_show(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_show_branch(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_show_index(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_sparse_checkout(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_status(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_stash(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_stripspace(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_submodule__helper(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_switch(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_symbolic_ref(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_tag(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_unpack_file(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_unpack_objects(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_update_index(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_update_ref(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_update_server_info(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_upload_archive(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_upload_pack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_var(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_verify_commit(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_verify_tag(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_version(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_whatchanged(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_worktree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_write_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_verify_pack(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_show_ref(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_pack_refs(int argc, const char **argv, const char *prefix, struct repository *repo);
int cmd_replace(int argc, const char **argv, const char *prefix, struct repository *repo);

#endif
