src/gui/font_options.zig

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//! Shared font option validation for config files and native CLI flags.
const std = @import("std");

pub const Error = error{InvalidValue};

/// Ghostty-style point size: finite, inclusive range 1–192 points.
/// The upper limit is 256 pixels at Linux's 96 DPI and 100% display scale.
pub fn parsePointSize(text: []const u8) Error!f64 {
    const value = std.fmt.parseFloat(f64, text) catch return error.InvalidValue;
    if (!std.math.isFinite(value) or value < 1 or value > 192) return error.InvalidValue;
    return value;
}

test "point size validation is shared and bounded" {
    try std.testing.expectEqual(@as(f64, 12.5), try parsePointSize("12.5"));
    try std.testing.expectError(error.InvalidValue, parsePointSize("nan"));
    try std.testing.expectError(error.InvalidValue, parsePointSize("0"));
    try std.testing.expectError(error.InvalidValue, parsePointSize("193"));
}