render_blank

fn render_blank(
    gpa: std.mem.Allocator,
    bw: *Writer,
    defines: std.StringArrayHashMap(Value),
    include_path: []const u8,
    include_guard_override: ?[]const u8,
) !void {
    const include_guard_name = include_guard_override orelse blk: {
        const name = try gpa.dupe(u8, include_path);
        for (name) |*byte| {
            switch (byte.*) {
                'a'...'z' => byte.* = byte.* - 'a' + 'A',
                'A'...'Z', '0'...'9' => continue,
                else => byte.* = '_',
            }
        }
        break :blk name;
    };
    defer if (include_guard_override == null) gpa.free(include_guard_name);

    try bw.print(
        \\#ifndef {[0]s}
        \\#define {[0]s}
        \\
    , .{include_guard_name});

    const values = defines.values();
    for (defines.keys(), 0..) |name, i| try renderValueC(bw, name, values[i]);

    try bw.print(
        \\#endif /* {s} */
        \\
    , .{include_guard_name});
}