create

pub fn create(owner: *std.Build, options: Options) *ConfigHeader {
    const config_header = owner.allocator.create(ConfigHeader) catch @panic("OOM");

    var include_path: []const u8 = "config.h";

    if (options.style.getPath()) |s| default_include_path: {
        const sub_path = switch (s) {
            .src_path => |sp| sp.sub_path,
            .generated => break :default_include_path,
            .cwd_relative => |sub_path| sub_path,
            .dependency => |dependency| dependency.sub_path,
        };
        const basename = std.fs.path.basename(sub_path);
        if (std.mem.endsWith(u8, basename, ".h.in")) {
            include_path = basename[0 .. basename.len - 3];
        }
    }

    if (options.include_path) |p| {
        include_path = p;
    }

    const name = if (options.style.getPath()) |s|
        owner.fmt("configure {s} header {s} to {s}", .{
            @tagName(options.style), s.getDisplayName(), include_path,
        })
    else
        owner.fmt("configure {s} header to {s}", .{ @tagName(options.style), include_path });

    config_header.* = .{
        .step = .init(.{
            .id = base_id,
            .name = name,
            .owner = owner,
            .makeFn = make,
            .first_ret_addr = options.first_ret_addr orelse @returnAddress(),
        }),
        .style = options.style,
        .values = .init(owner.allocator),

        .max_bytes = options.max_bytes,
        .include_path = include_path,
        .include_guard_override = options.include_guard_override,
        .generated_dir = .{ .step = &config_header.step },
    };

    if (options.style.getPath()) |s| {
        s.addStepDependencies(&config_header.step);
    }
    return config_header;
}