Implement support for strikethrough text.

https://defs.ircdocs.horse/info/formatting.html

src/common/outbound.c

@@ -4434,6 +4434,9 @@ check_special_chars (char *cmd, int do_ascii) /* check for %X */
 				case 'I':
 					buf[i] = '\035';
 					break;
+				case 'S':
+					buf[i] = '\036';
+					break;
 				case 'C':
 					buf[i] = '\003';
 					break;

src/common/util.c

@@ -329,6 +329,7 @@ strip_color2 (const char *src, int len, char *dst, int flags)
 			case '\026':			  /*ATTR_REVERSE: */
 			case '\002':			  /*ATTR_BOLD: */
 			case '\037':			  /*ATTR_UNDERLINE: */
+			case '\036':			  /*ATTR_STRIKETHROUGH: */
 			case '\035':			  /*ATTR_ITALICS: */
 				if (!(flags & STRIP_ATTRIB)) goto pass_char;
 				break;

src/fe-gtk/maingui.c

@@ -1394,6 +1394,8 @@ mg_color_insert (GtkWidget *item, gpointer userdata)
 			text = "\037"; break;
 		case 102:
 			text = "\035"; break;
+		case 103:
+			text = "\036"; break;
 		default:
 			text = "\017"; break;
 		}
@@ -1447,7 +1449,8 @@ mg_create_color_menu (GtkWidget *menu, session *sess)
 	mg_markup_item (submenu, _("<b>Bold</b>"), 100);
 	mg_markup_item (submenu, _("<u>Underline</u>"), 101);
 	mg_markup_item (submenu, _("<i>Italic</i>"), 102);
-	mg_markup_item (submenu, _("Normal"), 103);
+	mg_markup_item (submenu, _("<s>Strikethrough</s>"), 103);
+	mg_markup_item (submenu, _("Normal"), 999);
 
 	subsubmenu = mg_submenu (submenu, _("Colors 0-7"));
 

src/fe-gtk/sexy-spell-entry.c

@@ -389,6 +389,17 @@ insert_italic (SexySpellEntry *entry, guint start, gboolean toggle)
 	pango_attr_list_change (entry->priv->attr_list, iattr);
 }
 
+static void
+insert_strikethrough (SexySpellEntry *entry, guint start, gboolean toggle)
+{
+	PangoAttribute *sattr;
+
+	sattr  = pango_attr_strikethrough_new (!toggle);
+	sattr->start_index = start;
+	sattr->end_index = PANGO_ATTR_INDEX_TO_TEXT_END;
+	pango_attr_list_change (entry->priv->attr_list, sattr);
+}
+
 static void
 insert_color (SexySpellEntry *entry, guint start, int fgcolor, int bgcolor)
 {
@@ -429,6 +440,7 @@ insert_reset (SexySpellEntry *entry, guint start)
 	insert_bold (entry, start, TRUE);
 	insert_underline (entry, start, TRUE);
 	insert_italic (entry, start, TRUE);
+	insert_strikethrough (entry, start, TRUE);
 	insert_color (entry, start, -1, -1);
 }
 
@@ -918,6 +930,7 @@ check_attributes (SexySpellEntry *entry, const char *text, int len)
 	gboolean bold = FALSE;
 	gboolean italic = FALSE;
 	gboolean underline = FALSE;
+	gboolean strikethrough = FALSE;
 	int parsing_color = 0;
 	char fg_color[3];
 	char bg_color[3];
@@ -942,6 +955,12 @@ check_attributes (SexySpellEntry *entry, const char *text, int len)
 			italic = !italic;
 			goto check_color;
 
+		case ATTR_STRIKETHROUGH:
+			insert_hiddenchar (entry, i, i + 1);
+			insert_strikethrough (entry, i, strikethrough);
+			strikethrough = !strikethrough;
+			goto check_color;
+
 		case ATTR_UNDERLINE:
 			insert_hiddenchar (entry, i, i + 1);
 			insert_underline (entry, i, underline);
@@ -954,6 +973,7 @@ check_attributes (SexySpellEntry *entry, const char *text, int len)
 			bold = FALSE;
 			italic = FALSE;
 			underline = FALSE;
+			strikethrough = FALSE;
 			goto check_color;
 
 		case ATTR_HIDDEN:

src/fe-gtk/xtext.c

@@ -433,6 +433,7 @@ gtk_xtext_init (GtkXText * xtext)
 	xtext->nc = 0;
 	xtext->pixel_offset = 0;
 	xtext->underline = FALSE;
+	xtext->strikethrough = FALSE;
 	xtext->hidden = FALSE;
 	xtext->font = NULL;
 	xtext->layout = NULL;
@@ -2451,6 +2452,7 @@ gtk_xtext_strip_color (unsigned char *text, int len, unsigned char *outbuf,
 			case ATTR_REVERSE:
 			case ATTR_BOLD:
 			case ATTR_UNDERLINE:
+			case ATTR_STRIKETHROUGH:
 			case ATTR_ITALICS:
 				xtext_do_chunk (&c);
 				if (*text == ATTR_RESET)
@@ -2627,6 +2629,13 @@ gtk_xtext_render_flush (GtkXText * xtext, int x, int y, unsigned char *str,
 		g_object_unref (pix);
 	}
 
+	if (xtext->strikethrough)
+	{
+		/* pango_attr_strikethrough_new does not render in the custom widget so we need to reinvent the wheel */
+		y = dest_y + (xtext->fontsize / 2);
+		gdk_draw_line (xtext->draw_buf, gc, dest_x, y, dest_x + str_width - 1, y);
+	}
+
 	if (xtext->underline)
 	{
 dounder:
@@ -2651,6 +2660,7 @@ gtk_xtext_reset (GtkXText * xtext, int mark, int attribs)
 	if (attribs)
 	{
 		xtext->underline = FALSE;
+		xtext->strikethrough = FALSE;
 		xtext->hidden = FALSE;
 	}
 	if (!mark)
@@ -2961,6 +2971,12 @@ gtk_xtext_render_str (GtkXText * xtext, int y, textentry * ent,
 				pstr += j + 1;
 				j = 0;
 				break;
+			case ATTR_STRIKETHROUGH:
+				RENDER_FLUSH;
+				xtext->strikethrough = !xtext->strikethrough;
+				pstr += j + 1;
+				j = 0;
+				break;
 			case ATTR_ITALICS:
 				RENDER_FLUSH;
 				*emphasis ^= EMPH_ITAL;
@@ -3191,6 +3207,7 @@ find_next_wrap (GtkXText * xtext, textentry * ent, unsigned char *str,
 			case ATTR_REVERSE:
 			case ATTR_BOLD:
 			case ATTR_UNDERLINE:
+			case ATTR_STRIKETHROUGH:
 			case ATTR_ITALICS:
 				if (*str == ATTR_RESET)
 					emphasis = 0;

src/fe-gtk/xtext.h

@@ -29,16 +29,17 @@
 #define GTK_IS_XTEXT_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_XTEXT))
 #define GTK_XTEXT_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_XTEXT, GtkXTextClass))
 
-#define ATTR_BOLD			'\002'
-#define ATTR_COLOR		'\003'
-#define ATTR_BLINK		'\006'
-#define ATTR_BEEP			'\007'
-#define ATTR_HIDDEN		'\010'
-#define ATTR_ITALICS2	'\011'
-#define ATTR_RESET		'\017'
-#define ATTR_REVERSE		'\026'
-#define ATTR_ITALICS		'\035'
-#define ATTR_UNDERLINE	'\037'
+#define ATTR_BOLD				'\002'
+#define ATTR_COLOR			'\003'
+#define ATTR_BLINK			'\006'
+#define ATTR_BEEP				'\007'
+#define ATTR_HIDDEN			'\010'
+#define ATTR_ITALICS2		'\011'
+#define ATTR_RESET			'\017'
+#define ATTR_REVERSE			'\026'
+#define ATTR_ITALICS			'\035'
+#define ATTR_STRIKETHROUGH	'\036'
+#define ATTR_UNDERLINE		'\037'
 
 /* these match palette.h */
 #define XTEXT_MIRC_COLS 32
@@ -207,6 +208,7 @@ struct _GtkXText
 
 	/* current text states */
 	unsigned int underline:1;
+	unsigned int strikethrough:1;
 	unsigned int hidden:1;
 
 	/* text parsing states */