debug.zig
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debug.zig
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	const std = @import("std");
	const builtin = @import("builtin");

	pub var enabled: bool = false;

	pub fn log(comptime fmt: []const u8, args: anytype) void {
	if (!enabled) return;

	var buf: [2048]u8 = undefined;
	const msg = std.fmt.bufPrint(&buf, "[pkg] " ++ fmt ++ "\n", args) catch return;

	if (comptime builtin.os.tag == .windows) {
	const handle = std.os.windows.GetStdHandle(std.os.windows.STD_ERROR_HANDLE) catch return;
	_ = std.os.windows.WriteFile(handle, msg, null) catch {};
	} else _ = std.c.write(2, msg.ptr, msg.len);
	}

	pub fn timer(comptime label: []const u8, start: u64) u64 {
	if (!enabled) return start;

	const now = std.time.nanoTimestamp();
	const elapsed_ns: u64 = @intCast(now - @as(i128, start));
	const elapsed_ms = elapsed_ns / 1_000_000;

	log("{s}: {d}ms", .{ label, elapsed_ms });

	return @intCast(now);
	}