summaryrefslogtreecommitdiff
path: root/parse-options.c
diff options
context:
space:
mode:
authorPierre Habouzit <madcoder@debian.org>2007-10-14 23:38:30 (GMT)
committerJunio C Hamano <gitster@pobox.com>2007-10-30 04:03:30 (GMT)
commitd7a38c54a6ccbcbcf29d8cf1110b2702c8b3f7f8 (patch)
treea251284aae998f1eca3349c662e2d05fe3744820 /parse-options.c
parent4a59fd131229968b08af9bdf221c341f54c52983 (diff)
downloadgit-d7a38c54a6ccbcbcf29d8cf1110b2702c8b3f7f8.zip
git-d7a38c54a6ccbcbcf29d8cf1110b2702c8b3f7f8.tar.gz
git-d7a38c54a6ccbcbcf29d8cf1110b2702c8b3f7f8.tar.bz2
parse-options: be able to generate usages automatically
Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Diffstat (limited to 'parse-options.c')
-rw-r--r--parse-options.c73
1 files changed, 68 insertions, 5 deletions
diff --git a/parse-options.c b/parse-options.c
index 7bdffdb..57a2a11 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -123,7 +123,7 @@ static int parse_long_opt(struct optparse_t *p, const char *arg,
}
int parse_options(int argc, const char **argv, const struct option *options,
- const char *usagestr, int flags)
+ const char * const usagestr[], int flags)
{
struct optparse_t args = { argv + 1, argc - 1, NULL };
int j = 0;
@@ -140,9 +140,9 @@ int parse_options(int argc, const char **argv, const struct option *options,
args.opt = arg + 1;
do {
if (*args.opt == 'h')
- usage(usagestr);
+ usage_with_options(usagestr, options);
if (parse_short_opt(&args, options) < 0)
- usage(usagestr);
+ usage_with_options(usagestr, options);
} while (args.opt);
continue;
}
@@ -156,12 +156,75 @@ int parse_options(int argc, const char **argv, const struct option *options,
}
if (!strcmp(arg + 2, "help"))
- usage(usagestr);
+ usage_with_options(usagestr, options);
if (parse_long_opt(&args, arg + 2, options))
- usage(usagestr);
+ usage_with_options(usagestr, options);
}
memmove(argv + j, args.argv, args.argc * sizeof(*argv));
argv[j + args.argc] = NULL;
return j + args.argc;
}
+
+#define USAGE_OPTS_WIDTH 24
+#define USAGE_GAP 2
+
+void usage_with_options(const char * const *usagestr,
+ const struct option *opts)
+{
+ struct strbuf sb;
+
+ strbuf_init(&sb, 4096);
+ strbuf_addstr(&sb, *usagestr);
+ strbuf_addch(&sb, '\n');
+ while (*++usagestr)
+ strbuf_addf(&sb, " %s\n", *usagestr);
+
+ if (opts->type != OPTION_GROUP)
+ strbuf_addch(&sb, '\n');
+
+ for (; opts->type != OPTION_END; opts++) {
+ size_t pos;
+ int pad;
+
+ if (opts->type == OPTION_GROUP) {
+ strbuf_addch(&sb, '\n');
+ if (*opts->help)
+ strbuf_addf(&sb, "%s\n", opts->help);
+ continue;
+ }
+
+ pos = sb.len;
+ strbuf_addstr(&sb, " ");
+ if (opts->short_name)
+ strbuf_addf(&sb, "-%c", opts->short_name);
+ if (opts->long_name && opts->short_name)
+ strbuf_addstr(&sb, ", ");
+ if (opts->long_name)
+ strbuf_addf(&sb, "--%s", opts->long_name);
+
+ switch (opts->type) {
+ case OPTION_INTEGER:
+ strbuf_addstr(&sb, " <n>");
+ break;
+ case OPTION_STRING:
+ if (opts->argh)
+ strbuf_addf(&sb, " <%s>", opts->argh);
+ else
+ strbuf_addstr(&sb, " ...");
+ break;
+ default:
+ break;
+ }
+
+ pad = sb.len - pos;
+ if (pad <= USAGE_OPTS_WIDTH)
+ pad = USAGE_OPTS_WIDTH - pad;
+ else {
+ strbuf_addch(&sb, '\n');
+ pad = USAGE_OPTS_WIDTH;
+ }
+ strbuf_addf(&sb, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
+ }
+ usage(sb.buf);
+}