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parse-options-cb: implement parse_opt_passthru()

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Certain git commands, such as git-pull, are simply wrappers around other
git commands like git-fetch, git-merge and git-rebase. As such, these
wrapper commands will typically need to "pass through" command-line
options of the commands they wrap.

Implement the parse_opt_passthru() parse-options callback, which will
reconstruct the command-line option into an char* string, such that it
can be passed to another git command.

Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Paul Tan 2015-06-14 16:41:48 +08:00 committed by Junio C Hamano
parent 7974889a05
commit 6b3ee18dc5
3 changed files with 59 additions and 0 deletions
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7
Documentation/technical/api-parse-options.txt
View File

@ -212,6 +212,13 @@ There are some macros to easily define options:
Use it to hide deprecated options that are still to be recognized
and ignored silently.
`OPT_PASSTHRU(short, long, &char_var, arg_str, description, flags)`::
Introduce an option that will be reconstructed into a char* string,
which must be initialized to NULL. This is useful when you need to
pass the command-line option to another command. Any previous value
will be overwritten, so this should only be used for options where
the last one specified on the command line wins.
The last element of the array must be `OPT_END()`.

49
parse-options-cb.c
View File

@ -134,3 +134,52 @@ int parse_opt_noop_cb(const struct option *opt, const char *arg, int unset)
{
return 0;
}
/**
* Recreates the command-line option in the strbuf.
*/
static int recreate_opt(struct strbuf *sb, const struct option *opt,
const char *arg, int unset)
{
strbuf_reset(sb);
if (opt->long_name) {
strbuf_addstr(sb, unset ? "--no-" : "--");
strbuf_addstr(sb, opt->long_name);
if (arg) {
strbuf_addch(sb, '=');
strbuf_addstr(sb, arg);
}
} else if (opt->short_name && !unset) {
strbuf_addch(sb, '-');
strbuf_addch(sb, opt->short_name);
if (arg)
strbuf_addstr(sb, arg);
} else
return -1;
return 0;
}
/**
* For an option opt, recreates the command-line option in opt->value which
* must be an char* initialized to NULL. This is useful when we need to pass
* the command-line option to another command. Since any previous value will be
* overwritten, this callback should only be used for options where the last
* one wins.
*/
int parse_opt_passthru(const struct option *opt, const char *arg, int unset)
{
static struct strbuf sb = STRBUF_INIT;
char **opt_value = opt->value;
if (recreate_opt(&sb, opt, arg, unset) < 0)
return -1;
if (*opt_value)
free(*opt_value);
*opt_value = strbuf_detach(&sb, NULL);
return 0;
}

3
parse-options.h
View File

@ -224,6 +224,7 @@ extern int parse_opt_with_commit(const struct option *, const char *, int);
extern int parse_opt_tertiary(const struct option *, const char *, int);
extern int parse_opt_string_list(const struct option *, const char *, int);
extern int parse_opt_noop_cb(const struct option *, const char *, int);
extern int parse_opt_passthru(const struct option *, const char *, int);
#define OPT__VERBOSE(var, h) OPT_COUNTUP('v', "verbose", (var), (h))
#define OPT__QUIET(var, h) OPT_COUNTUP('q', "quiet", (var), (h))
@ -242,5 +243,7 @@ extern int parse_opt_noop_cb(const struct option *, const char *, int);
OPT_COLOR_FLAG(0, "color", (var), (h))
#define OPT_COLUMN(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
#define OPT_PASSTHRU(s, l, v, a, h, f) \
{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru }
#endif