degesch: add support for crossed-out text

Assuming that sgr0 includes rmxx behaviour, which should be true.

degesch.c

@@ -2761,11 +2761,12 @@ init_colors (struct app_context *ctx)
 
 enum
 {
-	TEXT_BOLD      = 1 << 0,
-	TEXT_ITALIC    = 1 << 1,
-	TEXT_UNDERLINE = 1 << 2,
-	TEXT_INVERSE   = 1 << 3,
-	TEXT_BLINK     = 1 << 4
+	TEXT_BOLD        = 1 << 0,
+	TEXT_ITALIC      = 1 << 1,
+	TEXT_UNDERLINE   = 1 << 2,
+	TEXT_INVERSE     = 1 << 3,
+	TEXT_BLINK       = 1 << 4,
+	TEXT_CROSSED_OUT = 1 << 5
 };
 
 struct attr_printer
@@ -2939,9 +2940,14 @@ attr_printer_apply (struct attr_printer *self,
 			0,   // blank
 			0,   // protect
 			0)); // acs
-	if (enter_italics_mode && (text_attrs & TEXT_ITALIC))
+	if ((text_attrs & TEXT_ITALIC) && enter_italics_mode)
 		attr_printer_tputs (self, enter_italics_mode);
 
+	char *smxx = NULL;
+	if ((text_attrs & TEXT_CROSSED_OUT)
+	 && (smxx = tigetstr ("smxx")) && smxx != (char *) -1)
+		attr_printer_tputs (self, smxx);
+
 	if (fg >= 0)
 		attr_printer_tputs (self, g_terminal.color_set_fg[fg]);
 	if (bg >= 0)
@@ -3199,10 +3205,12 @@ formatter_parse_mirc (struct formatter *self, const char *s)
 
 		switch (c)
 		{
-		case '\x02': FORMATTER_ADD_SIMPLE (self, BOLD);      break;
-		case '\x1d': FORMATTER_ADD_SIMPLE (self, ITALIC);    break;
-		case '\x1f': FORMATTER_ADD_SIMPLE (self, UNDERLINE); break;
-		case '\x16': FORMATTER_ADD_SIMPLE (self, INVERSE);   break;
+		case '\x02': FORMATTER_ADD_SIMPLE (self, BOLD);        break;
+		case '\x11': /* monospace, N/A */                      break;
+		case '\x1d': FORMATTER_ADD_SIMPLE (self, ITALIC);      break;
+		case '\x1e': FORMATTER_ADD_SIMPLE (self, CROSSED_OUT); break;
+		case '\x1f': FORMATTER_ADD_SIMPLE (self, UNDERLINE);   break;
+		case '\x16': FORMATTER_ADD_SIMPLE (self, INVERSE);     break;
 
 		case '\x03':
 			s = formatter_parse_mirc_color (self, s);
@@ -13523,6 +13531,9 @@ process_mirc_escape (const struct pollfd *fd, struct app_context *ctx)
 	case 'i' ^ 96:
 	case 'i':
 	case ']': CALL_ (ctx->input, insert, "\x1d"); break;
+	case 'x' ^ 96:
+	case 'x':
+	case '^': CALL_ (ctx->input, insert, "\x1e"); break;
 	case 'u' ^ 96:
 	case 'u':
 	case '_': CALL_ (ctx->input, insert, "\x1f"); break;