sgr: parse italic (render not implemented)

src/terminal/sgr.zig

@@ -21,6 +21,9 @@ pub const Attribute = union(enum) {
     /// Bold the text.
     bold: void,
 
+    /// Italic text.
+    italic: void,
+
     /// Faint/dim text.
     faint: void,
 
@@ -97,6 +100,8 @@ pub const Parser = struct {
 
             2 => return Attribute{ .faint = {} },
 
+            3 => return Attribute{ .italic = {} },
+
             4 => return Attribute{ .underline = {} },
 
             5 => return Attribute{ .blink = {} },
@@ -224,6 +229,11 @@ test "sgr: bold" {
     try testing.expect(v == .bold);
 }
 
+test "sgr: italic" {
+    const v = testParse(&[_]u16{3});
+    try testing.expect(v == .italic);
+}
+
 test "sgr: inverse" {
     {
         const v = testParse(&[_]u16{7});