const std = @import("std"); pub const InputAppearance = enum {    lines,    tint,     pub const default: InputAppearance = .tint;     pub fn label(self: InputAppearance) []const u8 {        return switch (self) {            .lines => "lines",            .tint => "tint",        };    }     pub fn parse(value: []const u8) ?InputAppearance {        const trimmed = std.mem.trim(u8, value, " \t");        if (std.ascii.eqlIgnoreCase(trimmed, InputAppearance.lines.label())) return .lines;        if (std.ascii.eqlIgnoreCase(trimmed, InputAppearance.tint.label())) return .tint;        return null;    }     pub fn isPersistedLabel(value: []const u8) bool {        return std.mem.eql(u8, value, InputAppearance.lines.label()) or            std.mem.eql(u8, value, InputAppearance.tint.label());    }}; test "input appearance owns parsing defaults and persisted labels" {    try std.testing.expectEqual(InputAppearance.tint, InputAppearance.default);    try std.testing.expectEqual(InputAppearance.lines, InputAppearance.parse(" LINES ").?);    try std.testing.expectEqualStrings("lines", InputAppearance.lines.label());    try std.testing.expectEqual(InputAppearance.tint, InputAppearance.parse("tint").?);    try std.testing.expectEqualStrings("tint", InputAppearance.tint.label());    try std.testing.expect(InputAppearance.parse("minimal-maxxing") == null);    try std.testing.expect(InputAppearance.parse("no-lines") == null);    try std.testing.expect(InputAppearance.isPersistedLabel("lines"));    try std.testing.expect(InputAppearance.isPersistedLabel("tint"));    try std.testing.expect(!InputAppearance.isPersistedLabel(" LINES "));}