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git/builtin.h
Martin Ågren c409824cc2 git.c: let builtins opt for handling `pager.foo` themselves 
Before launching a builtin git foo and unless mechanisms with precedence
are in use, we check for and handle the `pager.foo` config. This is done
without considering exactly how git foo is being used, and indeed, git.c
cannot (and should not) know what the arguments to git foo are supposed
to achieve.

In practice this means that, e.g., `git -c pager.tag tag -a new-tag`
results in errors such as "Vim: Warning: Output is not to a terminal"
and a garbled terminal. Someone who makes use of both `git tag -a` and
`git tag -l` will probably not set `pager.tag`, so that `git tag -a`
will actually work, at the cost of not paging output of `git tag -l`.

To allow individual builtins to make more informed decisions about when
to respect `pager.foo`, introduce a flag DELAY_PAGER_CONFIG. If the flag
is set, do not check `pager.foo`.

Do not check for DELAY_PAGER_CONFIG in `execv_dashed_external()`. That
call site is arguably wrong, although in a way that is not yet visible,
and will be changed in a slightly different direction in a later patch.

Don't add any users of DELAY_PAGER_CONFIG just yet, one will follow in a
later patch.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-03 11:08:10 -07:00

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#ifndef BUILTIN_H
#define BUILTIN_H
#include "git-compat-util.h"
#include "strbuf.h"
#include "cache.h"
#include "commit.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);
*
* . 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.
*
* `SUPPORT_SUPER_PREFIX`:
*
* The built-in supports `--super-prefix`.
*
* `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.
*
* . 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.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.
*/
#define DEFAULT_MERGE_LOG_LEN 20
extern const char git_usage_string[];
extern const char git_more_info_string[];
#define PRUNE_PACKED_DRY_RUN 01
#define PRUNE_PACKED_VERBOSE 02
extern void prune_packed_objects(int);
struct fmt_merge_msg_opts {
unsigned add_title:1,
credit_people:1;
int shortlog_len;
};
extern int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
struct fmt_merge_msg_opts *);
extern int is_builtin(const char *s);
extern int cmd_add(int argc, const char **argv, const char *prefix);
extern int cmd_am(int argc, const char **argv, const char *prefix);
extern int cmd_annotate(int argc, const char **argv, const char *prefix);
extern int cmd_apply(int argc, const char **argv, const char *prefix);
extern int cmd_archive(int argc, const char **argv, const char *prefix);
extern int cmd_bisect__helper(int argc, const char **argv, const char *prefix);
extern int cmd_blame(int argc, const char **argv, const char *prefix);
extern int cmd_branch(int argc, const char **argv, const char *prefix);
extern int cmd_bundle(int argc, const char **argv, const char *prefix);
extern int cmd_cat_file(int argc, const char **argv, const char *prefix);
extern int cmd_checkout(int argc, const char **argv, const char *prefix);
extern int cmd_checkout_index(int argc, const char **argv, const char *prefix);
extern int cmd_check_attr(int argc, const char **argv, const char *prefix);
extern int cmd_check_ignore(int argc, const char **argv, const char *prefix);
extern int cmd_check_mailmap(int argc, const char **argv, const char *prefix);
extern int cmd_check_ref_format(int argc, const char **argv, const char *prefix);
extern int cmd_cherry(int argc, const char **argv, const char *prefix);
extern int cmd_cherry_pick(int argc, const char **argv, const char *prefix);
extern int cmd_clone(int argc, const char **argv, const char *prefix);
extern int cmd_clean(int argc, const char **argv, const char *prefix);
extern int cmd_column(int argc, const char **argv, const char *prefix);
extern int cmd_commit(int argc, const char **argv, const char *prefix);
extern int cmd_commit_tree(int argc, const char **argv, const char *prefix);
extern int cmd_config(int argc, const char **argv, const char *prefix);
extern int cmd_count_objects(int argc, const char **argv, const char *prefix);
extern int cmd_credential(int argc, const char **argv, const char *prefix);
extern int cmd_describe(int argc, const char **argv, const char *prefix);
extern int cmd_diff_files(int argc, const char **argv, const char *prefix);
extern int cmd_diff_index(int argc, const char **argv, const char *prefix);
extern int cmd_diff(int argc, const char **argv, const char *prefix);
extern int cmd_diff_tree(int argc, const char **argv, const char *prefix);
extern int cmd_difftool(int argc, const char **argv, const char *prefix);
extern int cmd_fast_export(int argc, const char **argv, const char *prefix);
extern int cmd_fetch(int argc, const char **argv, const char *prefix);
extern int cmd_fetch_pack(int argc, const char **argv, const char *prefix);
extern int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix);
extern int cmd_for_each_ref(int argc, const char **argv, const char *prefix);
extern int cmd_format_patch(int argc, const char **argv, const char *prefix);
extern int cmd_fsck(int argc, const char **argv, const char *prefix);
extern int cmd_gc(int argc, const char **argv, const char *prefix);
extern int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix);
extern int cmd_grep(int argc, const char **argv, const char *prefix);
extern int cmd_hash_object(int argc, const char **argv, const char *prefix);
extern int cmd_help(int argc, const char **argv, const char *prefix);
extern int cmd_index_pack(int argc, const char **argv, const char *prefix);
extern int cmd_init_db(int argc, const char **argv, const char *prefix);
extern int cmd_interpret_trailers(int argc, const char **argv, const char *prefix);
extern int cmd_log(int argc, const char **argv, const char *prefix);
extern int cmd_log_reflog(int argc, const char **argv, const char *prefix);
extern int cmd_ls_files(int argc, const char **argv, const char *prefix);
extern int cmd_ls_tree(int argc, const char **argv, const char *prefix);
extern int cmd_ls_remote(int argc, const char **argv, const char *prefix);
extern int cmd_mailinfo(int argc, const char **argv, const char *prefix);
extern int cmd_mailsplit(int argc, const char **argv, const char *prefix);
extern int cmd_merge(int argc, const char **argv, const char *prefix);
extern int cmd_merge_base(int argc, const char **argv, const char *prefix);
extern int cmd_merge_index(int argc, const char **argv, const char *prefix);
extern int cmd_merge_ours(int argc, const char **argv, const char *prefix);
extern int cmd_merge_file(int argc, const char **argv, const char *prefix);
extern int cmd_merge_recursive(int argc, const char **argv, const char *prefix);
extern int cmd_merge_tree(int argc, const char **argv, const char *prefix);
extern int cmd_mktag(int argc, const char **argv, const char *prefix);
extern int cmd_mktree(int argc, const char **argv, const char *prefix);
extern int cmd_mv(int argc, const char **argv, const char *prefix);
extern int cmd_name_rev(int argc, const char **argv, const char *prefix);
extern int cmd_notes(int argc, const char **argv, const char *prefix);
extern int cmd_pack_objects(int argc, const char **argv, const char *prefix);
extern int cmd_pack_redundant(int argc, const char **argv, const char *prefix);
extern int cmd_patch_id(int argc, const char **argv, const char *prefix);
extern int cmd_prune(int argc, const char **argv, const char *prefix);
extern int cmd_prune_packed(int argc, const char **argv, const char *prefix);
extern int cmd_pull(int argc, const char **argv, const char *prefix);
extern int cmd_push(int argc, const char **argv, const char *prefix);
extern int cmd_read_tree(int argc, const char **argv, const char *prefix);
extern int cmd_rebase__helper(int argc, const char **argv, const char *prefix);
extern int cmd_receive_pack(int argc, const char **argv, const char *prefix);
extern int cmd_reflog(int argc, const char **argv, const char *prefix);
extern int cmd_remote(int argc, const char **argv, const char *prefix);
extern int cmd_remote_ext(int argc, const char **argv, const char *prefix);
extern int cmd_remote_fd(int argc, const char **argv, const char *prefix);
extern int cmd_repack(int argc, const char **argv, const char *prefix);
extern int cmd_rerere(int argc, const char **argv, const char *prefix);
extern int cmd_reset(int argc, const char **argv, const char *prefix);
extern int cmd_rev_list(int argc, const char **argv, const char *prefix);
extern int cmd_rev_parse(int argc, const char **argv, const char *prefix);
extern int cmd_revert(int argc, const char **argv, const char *prefix);
extern int cmd_rm(int argc, const char **argv, const char *prefix);
extern int cmd_send_pack(int argc, const char **argv, const char *prefix);
extern int cmd_shortlog(int argc, const char **argv, const char *prefix);
extern int cmd_show(int argc, const char **argv, const char *prefix);
extern int cmd_show_branch(int argc, const char **argv, const char *prefix);
extern int cmd_status(int argc, const char **argv, const char *prefix);
extern int cmd_stripspace(int argc, const char **argv, const char *prefix);
extern int cmd_submodule__helper(int argc, const char **argv, const char *prefix);
extern int cmd_symbolic_ref(int argc, const char **argv, const char *prefix);
extern int cmd_tag(int argc, const char **argv, const char *prefix);
extern int cmd_tar_tree(int argc, const char **argv, const char *prefix);
extern int cmd_unpack_file(int argc, const char **argv, const char *prefix);
extern int cmd_unpack_objects(int argc, const char **argv, const char *prefix);
extern int cmd_update_index(int argc, const char **argv, const char *prefix);
extern int cmd_update_ref(int argc, const char **argv, const char *prefix);
extern int cmd_update_server_info(int argc, const char **argv, const char *prefix);
extern int cmd_upload_archive(int argc, const char **argv, const char *prefix);
extern int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix);
extern int cmd_var(int argc, const char **argv, const char *prefix);
extern int cmd_verify_commit(int argc, const char **argv, const char *prefix);
extern int cmd_verify_tag(int argc, const char **argv, const char *prefix);
extern int cmd_version(int argc, const char **argv, const char *prefix);
extern int cmd_whatchanged(int argc, const char **argv, const char *prefix);
extern int cmd_worktree(int argc, const char **argv, const char *prefix);
extern int cmd_write_tree(int argc, const char **argv, const char *prefix);
extern int cmd_verify_pack(int argc, const char **argv, const char *prefix);
extern int cmd_show_ref(int argc, const char **argv, const char *prefix);
extern int cmd_pack_refs(int argc, const char **argv, const char *prefix);
extern int cmd_replace(int argc, const char **argv, const char *prefix);
#endif
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