Sync OpenBSD patchset 1032:

Allow a single option to be specified to show-options to show just that
option.

cmd-set-option.c

@@ -29,9 +29,6 @@
 
 int	cmd_set_option_exec(struct cmd *, struct cmd_ctx *);
 
-int	cmd_set_option_find(const char *, const struct options_table_entry **,
-	    const struct options_table_entry **);
-
 int	cmd_set_option_unset(struct cmd *, struct cmd_ctx *,
 	    const struct options_table_entry *, struct options *,
 	    const char *);
@@ -81,39 +78,6 @@ const struct cmd_entry cmd_set_window_option_entry = {
 	cmd_set_option_exec
 };
 
-/* Look for an option in all three tables. */
-int
-cmd_set_option_find(
-    const char *optstr, const struct options_table_entry **table,
-    const struct options_table_entry **oe)
-{
-	static const struct options_table_entry	*tables[] = {
-		server_options_table,
-		window_options_table,
-		session_options_table
-	};
-	const struct options_table_entry	*oe_loop;
-	u_int					 i;
-
-	for (i = 0; i < nitems(tables); i++) {
-		for (oe_loop = tables[i]; oe_loop->name != NULL; oe_loop++) {
-			if (strncmp(oe_loop->name, optstr, strlen(optstr)) != 0)
-				continue;
-
-			/* If already found, ambiguous. */
-			if (*oe != NULL)
-				return (-1);
-			*oe = oe_loop;
-			*table = tables[i];
-
-			/* Bail now if an exact match. */
-			if (strcmp((*oe)->name, optstr) == 0)
-				break;
-		}
-	}
-	return (0);
-}
-
 int
 cmd_set_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 {
@@ -139,7 +103,7 @@ cmd_set_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 	/* Find the option entry, try each table. */
 	table = oe = NULL;
-	if (cmd_set_option_find(optstr, &table, &oe) != 0) {
+	if (options_table_find(optstr, &table, &oe) != 0) {
 		ctx->error(ctx, "ambiguous option: %s", optstr);
 		return (-1);
 	}

cmd-show-options.c

@@ -31,8 +31,8 @@ int	cmd_show_options_exec(struct cmd *, struct cmd_ctx *);
 
 const struct cmd_entry cmd_show_options_entry = {
 	"show-options", "show",
-	"gst:w", 0, 0,
+	"gst:w", 0, 1,
-	"[-gsw] [-t target-session|target-window]",
+	"[-gsw] [-t target-session|target-window] [option]",
 	0,
 	NULL,
 	NULL,
@@ -41,8 +41,8 @@ const struct cmd_entry cmd_show_options_entry = {
 
 const struct cmd_entry cmd_show_window_options_entry = {
 	"show-window-options", "showw",
-	"gt:", 0, 0,
+	"gt:", 0, 1,
-	"[-g] " CMD_TARGET_WINDOW_USAGE,
+	"[-g] " CMD_TARGET_WINDOW_USAGE " [option]",
 	0,
 	NULL,
 	NULL,
@@ -86,12 +86,28 @@ cmd_show_options_exec(struct cmd *self, struct cmd_ctx *ctx)
 		}
 	}
 
+	if (args->argc != 0) {
+		table = oe = NULL;
+		if (options_table_find(args->argv[0], &table, &oe) != 0) {
+			ctx->error(ctx, "ambiguous option: %s", args->argv[0]);
+			return (-1);
+		}
+		if (oe == NULL) {
+			ctx->error(ctx, "unknown option: %s", args->argv[0]);
+			return (-1);
+		}
+		if ((o = options_find1(oo, oe->name)) == NULL)
+			return (0);
+		optval = options_table_print_entry(oe, o);
+		ctx->print(ctx, "%s %s", oe->name, optval);
+	} else {
 		for (oe = table; oe->name != NULL; oe++) {
 			if ((o = options_find1(oo, oe->name)) == NULL)
 				continue;
 			optval = options_table_print_entry(oe, o);
 			ctx->print(ctx, "%s %s", oe->name, optval);
 		}
+	}
 
 	return (0);
 }

options-table.c

@@ -731,3 +731,36 @@ options_table_print_entry(
 	}
 	return (out);
 }
+
+/* Find an option. */
+int
+options_table_find(
+    const char *optstr, const struct options_table_entry **table,
+    const struct options_table_entry **oe)
+{
+	static const struct options_table_entry	*tables[] = {
+		server_options_table,
+		window_options_table,
+		session_options_table
+	};
+	const struct options_table_entry	*oe_loop;
+	u_int					 i;
+
+	for (i = 0; i < nitems(tables); i++) {
+		for (oe_loop = tables[i]; oe_loop->name != NULL; oe_loop++) {
+			if (strncmp(oe_loop->name, optstr, strlen(optstr)) != 0)
+				continue;
+
+			/* If already found, ambiguous. */
+			if (*oe != NULL)
+				return (-1);
+			*oe = oe_loop;
+			*table = tables[i];
+
+			/* Bail now if an exact match. */
+			if (strcmp((*oe)->name, optstr) == 0)
+				break;
+		}
+	}
+	return (0);
+}

tmux.1

@@ -2626,9 +2626,10 @@ The default is off.
 .It Xo Ic show-options
 .Op Fl gsw
 .Op Fl t Ar target-session | Ar target-window
+.Op Ar option
 .Xc
 .D1 (alias: Ic show )
-Show the window options with
+Show the window options (or a single window option if given) with
 .Fl w
 (equivalent to
 .Ic show-window-options ) ,
@@ -2642,9 +2643,10 @@ is used.
 .It Xo Ic show-window-options
 .Op Fl g
 .Op Fl t Ar target-window
+.Op Ar option
 .Xc
 .D1 (alias: Ic showw )
-List the window options for
+List the window options or a single option for
 .Ar target-window ,
 or the global window options if
 .Fl g

tmux.h

@@ -1415,6 +1415,9 @@ void	options_table_populate_tree(
 	    const struct options_table_entry *, struct options *);
 const char *options_table_print_entry(
 	    const struct options_table_entry *, struct options_entry *);
+int	options_table_find(
+	    const char *, const struct options_table_entry **,
+	    const struct options_table_entry **);
 
 /* job.c */
 extern struct joblist all_jobs;