zig init: also create a build.zig.zon

lib/init/build.zig.zon

@@ -0,0 +1,61 @@
+.{
+    .name = "$",
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+
+    // 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 = .{
+        // A future version of Zig will provide a `zig add <url>` subcommand
+        // for easily 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 an `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.
+        //    .path = "foo",
+        //},
+    },
+
+    // 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.
+    // 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 = .{
+        // This makes *all* files, recursively, included in this package. It is generally
+        // better to explicitly list the files and directories instead, to insure that
+        // fetching from tarballs, file system paths, and version control all result
+        // in the same contents hash.
+        "",
+        // For example...
+        //"build.zig",
+        //"build.zig.zon",
+        //"src",
+    },
+}

src/main.zig

@@ -4883,6 +4883,7 @@ pub fn cmdInit(gpa: Allocator, arena: Allocator, args: []const []const u8) !void
     const max_bytes = 10 * 1024 * 1024;
     const template_paths = [_][]const u8{
         "build.zig",
+        "build.zig.zon",
         "src" ++ s ++ "main.zig",
         "src" ++ s ++ "root.zig",
     };

test/tests.zig

@@ -783,6 +783,7 @@ pub fn addCliTests(b: *std.Build) *Step {
         init_exe.setName("zig init");
         init_exe.expectStdOutEqual("");
         init_exe.expectStdErrEqual("info: created build.zig\n" ++
+            "info: created build.zig.zon\n" ++
             "info: created src" ++ s ++ "main.zig\n" ++
             "info: created src" ++ s ++ "root.zig\n" ++
             "info: see `zig build --help` for a menu of options\n");