Add support for relative paths to the Bazel build

BUILD

@@ -15,6 +15,7 @@
 load("@bazel_ios_warnings//:strict_warnings_objc_library.bzl", "strict_warnings_objc_library")
 load("@build_bazel_rules_apple//apple:swift.bzl", "swift_library")
 load("@build_bazel_rules_apple//apple:ios.bzl", "ios_unit_test")
+load(":apple_framework_relative_headers.bzl", "apple_framework_relative_headers")
 
 licenses(["notice"])  # Apache 2.0
 
@@ -38,12 +39,20 @@ strict_warnings_objc_library(
     visibility = ["//visibility:public"],
 )
 
+apple_framework_relative_headers(
+    name = "MDFInternationalizationFrameworkHeaders",
+    hdrs = glob([
+        "Sources/*.h",
+    ]),
+    framework_name = "MDFInternationalization",
+)
+
 objc_library(
     name = "UnitTestsLib",
     srcs = glob([
         "Tests/*.m",
     ]),
-    deps = [":MDFInternationalization"],
+    deps = [":MDFInternationalization", ":MDFInternationalizationFrameworkHeaders"],
     visibility = ["//visibility:private"],
 )
 

WORKSPACE

@@ -12,6 +12,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+
+#git_repository(
+#    name = "io_bazel",
+#    remote = "https://github.com/bazelbuild/bazel.git",
+#    tag = "0.14.0",
+#)
+
+
+
+git_repository(
+    name = "com_github_bazelbuild_buildtools",
+    remote = "https://github.com/bazelbuild/buildtools.git",
+    tag = "0.11.1",
+)
+
 git_repository(
     name = "build_bazel_rules_apple",
     remote = "https://github.com/bazelbuild/rules_apple.git",

apple_framework_relative_headers.bzl

@@ -0,0 +1,60 @@
+"""Bazel rules for supporting framework-relative header imports."""
+
+load("@build_bazel_rules_apple//apple/bundling:file_actions.bzl", "file_actions")
+
+
+def _apple_framework_relative_headers_impl(ctx):
+  """Implementation for apple_framework_relative_headers rule."""
+  output_dir = ctx.attr.framework_name + "_apple_framework_relative_headers"
+
+  outputs = []
+  for f in ctx.files.hdrs:
+    framework_path =  "/".join([output_dir, ctx.attr.framework_name, f.basename])
+    framework_header_file = ctx.actions.declare_file(framework_path)
+    file_actions.symlink(ctx, f, framework_header_file)
+    outputs.append(framework_header_file)
+
+  include_dir = "/".join([
+      ctx.configuration.bin_dir.path, ctx.label.package, output_dir])
+  return [
+      apple_common.new_objc_provider(
+          header=depset(outputs),
+          include=depset([include_dir]),
+      ),
+      DefaultInfo(files=depset(outputs)),
+  ]
+
+
+apple_framework_relative_headers = rule(
+    _apple_framework_relative_headers_impl,
+    attrs = {
+        "hdrs": attr.label_list(allow_files=[".h"], allow_empty=False),
+        "framework_name": attr.string(mandatory=True),
+        "_realpath": attr.label(
+            cfg="host",
+            allow_files=True,
+            single_file=True,
+            default=Label("@bazel_tools//tools/objc:realpath"),
+        ),
+    },
+)
+"""Creates a directory structure suitable for framework-relative import
+statements.
+
+For example, one would be able to #import <Foo/Bar.h> given the following rules:
+
+    apple_framework_relative_headers(
+      name = "FooFrameworkHeaders",
+      hdrs = ["Source/Bar.h"],
+      framework_name = "Foo",
+    )
+
+    objc_library(
+      ...
+      deps = [":FooFrameworkHeaders"],
+    )
+
+Args:
+  hdrs: The list of header files.
+  framework_name: The name of the framework.
+"""