renderer/metal: underline urls

src/config/url.zig

@@ -0,0 +1,26 @@
+const std = @import("std");
+const oni = @import("oniguruma");
+
+/// Default URL regex. This is used to detect URLs in terminal output.
+/// This is here in the config package because one day the matchers will be
+/// configurable and this will be a default.
+///
+/// This is taken from the Alacritty project.
+pub const regex = "(ipfs:|ipns:|magnet:|mailto:|gemini://|gopher://|https://|http://|news:|file:|git://|ssh:|ftp://)[^\u{0000}-\u{001F}\u{007F}-\u{009F}<>\x22\\s{-}\\^⟨⟩\x60]+";
+
+test "url regex" {
+    try oni.testing.ensureInit();
+    var re = try oni.Regex.init(regex, .{}, oni.Encoding.utf8, oni.Syntax.default, null);
+    defer re.deinit();
+
+    // The URL cases to test that our regex matches. Feel free to add to this
+    // as we find bugs or just want more coverage.
+    const cases: []const []const u8 = &.{
+        "https://example.com",
+    };
+
+    for (cases) |case| {
+        var reg = try re.search(case, .{});
+        defer reg.deinit();
+    }
+}