Use width 2 when skin tone modifier detected

Fix: #82

1 files changed, 5 insertions, 0 deletions

diff --git a/src/DisplayWidth.zig b/src/DisplayWidth.zig
index d15dbae..9919a55 100644
--- a/src/DisplayWidth.zig
+++ b/src/DisplayWidth.zig
@@ -126,6 +126,8 @@ pub fn strWidth(dw: DisplayWidth, str: []const u8) usize {
                     // emoji text sequence.
                     if (ncp.code == 0xFE0E) w = 1;
                     if (ncp.code == 0xFE0F) w = 2;
+                    // Skin tones
+                    if (0x1F3FB <= ncp.code and ncp.code <= 0x1F3FF) w = 2;
                 }
 
                 // Only adding width of first non-zero-width code point.
@@ -201,6 +203,9 @@ test "strWidth" {
     try testing.expectEqual(@as(usize, 9), dw.strWidth("Ẓ̌á̲l͔̝̞̄̑͌g̖̘̘̔̔͢͞͝o̪̔T̢̙̫̈̍͞e̬͈͕͌̏͑x̺̍ṭ̓̓ͅ"));
     try testing.expectEqual(@as(usize, 17), dw.strWidth("슬라바 우크라이나"));
     try testing.expectEqual(@as(usize, 1), dw.strWidth("\u{378}"));
+
+    // https://codeberg.org/atman/zg/issues/82
+    try testing.expectEqual(@as(usize, 12), dw.strWidth("✍️✍🏻✍🏼✍🏽✍🏾✍🏿"));
 }
 
 /// centers `str` in a new string of width `total_width` (in display cells) using `pad` as padding.