feat: update to Zig v0.13.0

.gitignore

@@ -1,2 +1,3 @@
 zig-out/
 zig-cache/
+.zig-cache/

build.zig

@@ -15,17 +15,21 @@ pub fn build(b: *std.Build) void {
     // set a preferred release mode, allowing the user to decide how to optimize.
     const optimize = b.standardOptimizeOption(.{});
 
-    _ = b.addModule("bit-string", .{ .root_source_file = .{ .path = "src/lib.zig" } });
-
     const lib = b.addStaticLibrary(.{
         .name = "bit-string",
         // In this case the main source file is merely a path, however, in more
         // complicated build scripts, this could be a generated file.
-        .root_source_file = .{ .path = "src/lib.zig" },
+        .root_source_file = b.path("src/lib.zig"),
         .target = target,
         .optimize = optimize,
     });
 
+    const docs = b.addInstallDirectory(.{
+        .install_dir = .prefix,
+        .install_subdir = "docs",
+        .source_dir = lib.getEmittedDocs(),
+    });
+
     // This declares intent for the library to be installed into the standard
     // location when the user invokes the "install" step (the default step when
     // running `zig build`).
@@ -33,27 +37,20 @@ pub fn build(b: *std.Build) void {
 
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
-    const lib_tests = b.addTest(.{
-        .root_source_file = .{ .path = "src/test.zig" },
+    const lib_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/test.zig"),
         .target = target,
         .optimize = optimize,
     });
 
-    const run_main_tests = b.addRunArtifact(lib_tests);
+    const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
 
-    // This creates a build step. It will be visible in the `zig build --help` menu,
-    // and can be selected like this: `zig build test`
-    // This will evaluate the `test` step rather than the default, which is "install".
-    const test_step = b.step("test", "Run library tests");
-    test_step.dependOn(&run_main_tests.step);
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_lib_unit_tests.step);
 
-    // Build Documentation
-    const doc = b.addInstallDirectory(.{
-        .source_dir = lib.getEmittedDocs(),
-        .install_dir = .prefix,
-        .install_subdir = "docs",
-    });
-
-    const doc_step = b.step("doc", "Generate documentation");
-    doc_step.dependOn(&doc.step);
+    const docs_step = b.step("docs", "Emit docs");
+    docs_step.dependOn(&docs.step);
 }

build.zig.zon

@@ -1,12 +1,72 @@
 .{
+    // This is the default name used by packages depending on this one. For
+    // example, when a user runs `zig fetch --save <url>`, this field is used
+    // as the key in the `dependencies` table. Although the user can choose a
+    // different name, most users will stick with this provided value.
+    //
+    // It is redundant to include "zig" in this name because it is already
+    // within the Zig package namespace.
     .name = "bit-string",
+
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
     .version = "0.1.0",
+
+    // This field is optional.
+    // This is currently advisory only; Zig does not yet do anything
+    // with this value.
+    //.minimum_zig_version = "0.11.0",
+
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
+        //.example = .{
+        //    // When updating this field to a new URL, be sure to delete the corresponding
+        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
+        //    // the new URL.
+        //    .url = "https://example.com/foo.tar.gz",
+        //
+        //    // This is computed from the file contents of the directory of files that is
+        //    // obtained after fetching `url` and applying the inclusion rules given by
+        //    // `paths`.
+        //    //
+        //    // This field is the source of truth; packages do not come from a `url`; they
+        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
+        //    // obtain a package matching this `hash`.
+        //    //
+        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
+        //    .hash = "...",
+        //
+        //    // When this is provided, the package is found in a directory relative to the
+        //    // build root. In this case the package's hash is irrelevant and therefore not
+        //    // computed. This field and `url` are mutually exclusive.
+        //    .path = "foo",
+
+        //    // When this is set to `true`, a package is declared to be lazily
+        //    // fetched. This makes the dependency only get fetched if it is
+        //    // actually used.
+        //    .lazy = false,
+        //},
+    },
+
+    // Specifies the set of files and directories that are included in this package.
+    // Only files and directories listed here are included in the `hash` that
+    // is computed for this package. Only files listed here will remain on disk
+    // when using the zig package manager. As a rule of thumb, one should list
+    // files required for compilation plus any license(s).
+    // Paths are relative to the build root. Use the empty string (`""`) to refer to
+    // the build root itself.
+    // A directory listed here means that all files within, recursively, are included.
     .paths = .{
         "build.zig",
         "build.zig.zon",
-        "LICENSE",
-        "README.md",
-        "src"
+        "src",
+        // For example...
+        //"LICENSE",
+        //"README.md",
     },
-    .dependencies = .{},
 }

src/lib.zig

@@ -287,7 +287,7 @@ pub fn Bitfield(comptime bit_string: []const u8) type {
     };
 
     return @Type(.{ .Struct = .{
-        .layout = .Auto,
+        .layout = .auto,
         .fields = &fields,
         .decls = &.{},
         .is_tuple = false,
@@ -327,7 +327,7 @@ const pext = struct {
     }
 
     inline fn sw(comptime T: type, value: T, mask: T) T {
-        // FIXME: will be replaced in the future by  https://github.com/ziglang/zig/issues/14995 (hopefully?)
+        // FIXME: will be replaced in the future by https://github.com/ziglang/zig/issues/14995 (hopefully?)
 
         return switch (T) {
             u32, u64 => {