fix being incorrectly escaped

ircfmt/ircfmt.go

@@ -171,8 +171,16 @@ func Escape(in string) string {
 			out.WriteRune(']')
 
 		} else {
-			out.WriteRune(inRunes[0])
-			inRunes = inRunes[1:]
+			// special case for $$c
+			if len(inRunes) > 2 && inRunes[0] == '$' && inRunes[1] == '$' && inRunes[2] == 'c' {
+				out.WriteRune(inRunes[0])
+				out.WriteRune(inRunes[1])
+                out.WriteRune(inRunes[2])
+				inRunes = inRunes[3:]
+			} else {
+				out.WriteRune(inRunes[0])
+				inRunes = inRunes[1:]
+			}
 		}
 	}
 

ircfmt/ircfmt_test.go

@@ -14,6 +14,9 @@ var tests = []testcase{
 	{"te$c[green]4st", "te\x03034st"},
 	{"te$c[red,green]9st", "te\x034,039st"},
 	{" ▀█▄▀▪.▀  ▀ ▀  ▀ ·▀▀▀▀  ▀█▄▀ ▀▀ █▪ ▀█▄▀▪", " ▀█▄▀▪.▀  ▀ ▀  ▀ ·▀▀▀▀  ▀█▄▀ ▀▀ █▪ ▀█▄▀▪"},
+	{"test $$c", "test $c"},
+	{"test $c[]", "test \x03"},
+	{"test $$", "test $"},
 }
 
 var escapetests = []testcase{
@@ -61,6 +64,16 @@ func TestEscape(t *testing.T) {
 	}
 }
 
+func TestChain(t *testing.T) {
+	for _, pair := range tests {
+		escaped := Escape(pair.unescaped)
+		unescaped := Unescape(escaped)
+		if unescaped != pair.unescaped {
+			t.Errorf("for %q expected %q got %q", pair.unescaped, pair.unescaped, unescaped)
+		}
+	}
+}
+
 func TestUnescape(t *testing.T) {
 	for _, pair := range tests {
 		val := Unescape(pair.escaped)