add --bar to enable statusbar

ref: https://codeberg.org/nsxiv/nsxiv/issues/404

etc/nsxiv.1

@@ -44,8 +44,14 @@ is set to 0 then animation playback is disabled.
 .B "\-a, \-\-animate"
 Play animations of multi-frame images.
 .TP
-.B "\-b, \-\-no\-bar"
-Do not show statusbar at the bottom of the window.
+.B "\-b"
+Do not show statusbar.
+.TP
+.B "\-\-bar, \-\-no\-bar"
+Enables or disables statusbar.
+.B "\-\-no\-bar"
+is equivalent to
+.BR "\-b" .
 .TP
 .B "\-c, \-\-clean\-cache"
 Remove all orphaned cache files from the thumbnail cache directory and exit.

options.c

@@ -77,6 +77,7 @@ void parse_options(int argc, char **argv)
 		OPT_AA,
 		OPT_AL,
 		OPT_THUMB,
+		OPT_BAR,
 		OPT_BG,
 		OPT_CA,
 		OPT_CD
@@ -85,6 +86,7 @@ void parse_options(int argc, char **argv)
 		{ "framerate",      'A',     OPTPARSE_REQUIRED },
 		{ "animate",        'a',     OPTPARSE_NONE },
 		{ "no-bar",         'b',     OPTPARSE_NONE },
+		{ "bar",          OPT_BAR,   OPTPARSE_NONE },
 		{ "clean-cache",    'c',     OPTPARSE_NONE },
 		{ "embed",          'e',     OPTPARSE_REQUIRED },
 		{ "fullscreen",     'f',     OPTPARSE_NONE },
@@ -179,8 +181,8 @@ void parse_options(int argc, char **argv)
 		case 'a':
 			_options.animate = true;
 			break;
-		case 'b':
-			_options.hide_bar = true;
+		case 'b': case OPT_BAR:
+			_options.hide_bar = (opt == 'b');
 			break;
 		case 'c':
 			_options.clean_cache = true;