ircfmt: Add Reverse Colour (0x16)

ircfmt/doc.go

@@ -16,18 +16,19 @@ and such.
 The escape character we use in this library is the dollar sign ("$"), along
 with the given escape characters:
 
-	-------------------------------
-	 Name          | Escape | Raw
-	-------------------------------
-	 Dollarsign    |   $$   |  $
-	 Bold          |   $b   | 0x02
-	 Colour        |   $c   | 0x03
-	 Monospace     |   $m   | 0x11
-	 Italic        |   $i   | 0x1d
-	 Strikethrough |   $s   | 0x1e
-	 Underscore    |   $u   | 0x1f
-	 Reset         |   $r   | 0x0f
-	-------------------------------
+	--------------------------------
+	 Name           | Escape | Raw
+	--------------------------------
+	 Dollarsign     |   $$   |  $
+	 Bold           |   $b   | 0x02
+	 Colour         |   $c   | 0x03
+	 Monospace      |   $m   | 0x11
+	 Reverse Colour |   $v   | 0x16
+	 Italic         |   $i   | 0x1d
+	 Strikethrough  |   $s   | 0x1e
+	 Underscore     |   $u   | 0x1f
+	 Reset          |   $r   | 0x0f
+	--------------------------------
 
 Colours are escaped in a slightly different way, using the actual names of them
 rather than just the raw numbers.

ircfmt/ircfmt.go

@@ -12,6 +12,7 @@ const (
 	bold          string = "\x02"
 	colour        string = "\x03"
 	monospace     string = "\x11"
+	reverseColour string = "\x16"
 	italic        string = "\x1d"
 	strikethrough string = "\x1e"
 	underline     string = "\x1f"
@@ -25,7 +26,7 @@ const (
 
 var (
 	// valtoescape replaces most of IRC characters with our escapes.
-	valtoescape = strings.NewReplacer("$", "$$", colour, "$c", bold, "$b", italic, "$i", strikethrough, "$s", underline, "$u", monospace, "$m", reset, "$r")
+	valtoescape = strings.NewReplacer("$", "$$", colour, "$c", reverseColour, "$v", bold, "$b", italic, "$i", strikethrough, "$s", underline, "$u", monospace, "$m", reset, "$r")
 
 	// escapetoval contains most of our escapes and how they map to real IRC characters.
 	// intentionally skips colour, since that's handled elsewhere.
@@ -33,6 +34,7 @@ var (
 		'$': "$",
 		'b': bold,
 		'i': italic,
+		'v': reverseColour,
 		's': strikethrough,
 		'u': underline,
 		'm': monospace,