weston: Add support for "--foo bar" style options

A little earlier today I ended up spending a lot of time trying to
figure out why weston wasn't managing to launch over SSH and telling me
that I did not have a --tty option specified, despite me passing the
option strings ["--tty", "3"]. Turns out weston just doesn't support
that.

So, add support for this kind of format in addition to "--foo=bar" to
save others from making the same mistake I did.

Changes since v1:
 - Add comment about unreachable boolean check in long_option_with_arg()
 - Convert boolean check in long_option_with_arg() to assert

Signed-off-by: Lyude <lyude@redhat.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>

shared/option-parser.c

@@ -86,6 +86,31 @@ long_option(const struct weston_option *options, int count, char *arg)
 	return 0;
 }
 
+static int
+long_option_with_arg(const struct weston_option *options, int count, char *arg,
+		     char *param)
+{
+	int k, len;
+
+	for (k = 0; k < count; k++) {
+		if (!options[k].name)
+			continue;
+
+		len = strlen(options[k].name);
+		if (strncmp(options[k].name, arg + 2, len) != 0)
+			continue;
+
+		/* Since long_option() should handle all booleans, we should
+		 * never reach this
+		 */
+		assert(options[k].type != WESTON_OPTION_BOOLEAN);
+
+		return handle_option(options + k, param);
+	}
+
+	return 0;
+}
+
 static int
 short_option(const struct weston_option *options, int count, char *arg)
 {
@@ -148,6 +173,13 @@ parse_options(const struct weston_option *options,
 				if (long_option(options, count, argv[i]))
 					continue;
 
+				/* ...also handle --foo bar */
+				if (i + 1 < *argc &&
+				    long_option_with_arg(options, count,
+							 argv[i], argv[i+1])) {
+					i++;
+					continue;
+				}
 			} else {
 				/* Short option, e.g -f or -f42 */
 				if (short_option(options, count, argv[i]))