[WIP] Bazel support (#14)

* Added .bazelversion and updated gitignore.

* Added bazel files.

* fixup! Added bazel files.

* Generated bazel files. Having trouble with the test fixtures and Bundle.

* Treat helloworld.swift as txt since is just a fixture and reference for
the binary under the tests/.../fixture folder.

* Added tidy macro.

* fixup! Added tidy macro.

* Added some configs to .bazelrc

.bazelrc

@@ -0,0 +1,22 @@
+common --enable_bzlmod
+
+# Verbose Failures
+build --verbose_failures
+
+# Test output information
+test --test_output=errors --test_summary=detailed
+
+# Strict PATH. Helps prevent build cache invalidation due to PATH differences.
+build --incompatible_strict_action_env=true
+
+# Set minimum macOS version
+# This prevents the tests from failing
+build --macos_minimum_os=13.0
+build --host_macos_minimum_os=13.0
+
+# Configure Apple CC toolchain
+# https://github.com/bazelbuild/apple_support#toolchain-setup
+build --enable_platform_specific_config
+build:macos --apple_crosstool_top=@local_config_apple_cc//:toolchain
+build:macos --crosstool_top=@local_config_apple_cc//:toolchain
+build:macos --host_crosstool_top=@local_config_apple_cc//:toolchain

.bazelversion

@@ -0,0 +1 @@
+7.0.2

.gitignore

@@ -7,3 +7,9 @@ DerivedData/
 .swiftpm/config/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
+# gitignore template for Bazel build system
+# website: https://bazel.build/
+
+# Ignore all bazel-* symlinks. There is no full list since this can change
+# based on the name of the directory bazel is cloned into.
+/bazel-*

BUILD

@@ -0,0 +1,54 @@
+load("@gazelle//:def.bzl", "gazelle", "gazelle_binary")
+load("@rules_swift_package_manager//swiftpkg:defs.bzl", "swift_update_packages")
+load("@cgrindel_bazel_starlib//bzltidy:defs.bzl", "tidy")
+
+# Ignore the `.build` folder that is created by running Swift package manager
+# commands. The Swift Gazelle plugin executes some Swift package manager
+# commands to resolve external dependencies. This results in a `.build` file
+# being created.
+# NOTE: Swift package manager is not used to build any of the external packages.
+# The `.build` directory should be ignored. Be sure to configure your source
+# control to ignore it (i.e., add it to your `.gitignore`).
+# gazelle:exclude .build
+
+# This declaration builds a Gazelle binary that incorporates all of the Gazelle
+# plugins for the languages that you use in your workspace. In this example, we
+# are only listing the Gazelle plugin for Swift from rules_swift_package_manager.
+gazelle_binary(
+    name = "gazelle_bin",
+    languages = [
+        "@rules_swift_package_manager//gazelle",
+    ],
+)
+
+# This macro defines two targets: `swift_update_pkgs` and
+# `swift_update_pkgs_to_latest`.
+#
+# The `swift_update_pkgs` target should be run whenever the list of external
+# dependencies is updated in the `Package.swift`. Running this target will
+# populate the `swift_deps.bzl` with `swift_package` declarations for all of
+# the direct and transitive Swift packages that your project uses.
+#
+# The `swift_update_pkgs_to_latest` target should be run when you want to
+# update your Swift dependencies to their latest eligible version.
+swift_update_packages(
+    name = "swift_update_pkgs",
+    gazelle = ":gazelle_bin",
+    generate_swift_deps_for_workspace = False,
+    update_bzlmod_stanzas = True,
+)
+
+# This target updates the Bazel build files for your project. Run this target
+# whenever you add or remove source files from your project.
+gazelle(
+    name = "update_build_files",
+    gazelle = ":gazelle_bin",
+)
+
+tidy(
+    name = "tidy",
+    targets = [
+        ":swift_update_pkgs",
+        ":update_build_files",
+    ],
+)

MODULE.bazel

@@ -0,0 +1,22 @@
+# Source: https://www.buildbuddy.io/blog/how-to-migrate-an-ios-app-to-bazel/#swift-packages-swiftpm
+bazel_dep(name = "apple_support", version = "1.14.0")
+bazel_dep(name = "rules_swift", version = "1.16.0", repo_name = "build_bazel_rules_swift")
+# Support swift-package-manager
+bazel_dep(name = "rules_swift_package_manager", version = "0.29.2")
+bazel_dep(name = "gazelle", version = "0.35.0")
+# Allows the use of `tidy`
+bazel_dep(name = "cgrindel_bazel_starlib", version = "0.18.1")
+
+# swift_deps START
+swift_deps = use_extension(
+    "@rules_swift_package_manager//:extensions.bzl",
+    "swift_deps",
+)
+swift_deps.from_file(
+    deps_index = "//:swift_deps_index.json",
+)
+use_repo(
+    swift_deps,
+    "swiftpkg_swift_argument_parser",
+)
+# swift_deps END