GN: Change gen command syntax, support relative dirs.

tools/gn/filesystem_utils_unittest.cc

Index: tools/gn/filesystem_utils_unittest.cc
diff --git a/tools/gn/filesystem_utils_unittest.cc b/tools/gn/filesystem_utils_unittest.cc
index f62f4820c671d29d30ca6da96d9691ba6b89bb23..69ae67c2878f9c202a1fa27d49d9efb5293901e2 100644
--- a/tools/gn/filesystem_utils_unittest.cc
+++ b/tools/gn/filesystem_utils_unittest.cc
@@ -254,6 +254,55 @@ TEST(FilesystemUtils, DirectoryWithNoLastSlash) {
   EXPECT_EQ("/bar", DirectoryWithNoLastSlash(SourceDir("/bar/")));
 }
 
+TEST(FilesystemUtils, SourceDirForPath) {
+#if defined(OS_WIN)
+  base::FilePath root(L"C:\\source\\foo\\");
+  EXPECT_EQ("/C:/foo/bar/", SourceDirForPath(root,
+            base::FilePath(L"C:\\foo\\bar")).value());
+  EXPECT_EQ("/", SourceDirForPath(root,
+            base::FilePath(L"/")).value());
+  EXPECT_EQ("//", SourceDirForPath(root,
+            base::FilePath(L"C:\\source\\foo")).value());
+  EXPECT_EQ("//bar/", SourceDirForPath(root,
+            base::FilePath(L"C:\\source\\foo\\bar\\")). value());
+  EXPECT_EQ("//bar/baz/", SourceDirForPath(root,
+            base::FilePath(L"C:\\source\\foo\\bar\\baz")).value());
+
+  // Should be case-and-slash-insensitive.
+  EXPECT_EQ("//baR/", SourceDirForPath(root,
+            base::FilePath(L"c:/SOURCE\\Foo/baR/")).value());
+
+  // Some "weird" Windows paths.
+  EXPECT_EQ("/foo/bar/", SourceDirForPath(root,
+            base::FilePath(L"/foo/bar/")).value());
+  EXPECT_EQ("/C:/foo/bar/", SourceDirForPath(root,
+            base::FilePath(L"C:foo/bar/")).value());
+
+  // Also allow absolute GN-style Windows paths.
+  EXPECT_EQ("/C:/foo/bar/", SourceDirForPath(root,
+            base::FilePath(L"/C:/foo/bar")).value());
+  EXPECT_EQ("//bar/", SourceDirForPath(root,
+            base::FilePath(L"/C:/source/foo/bar")).value());
+
+#else
+  base::FilePath root("/source/foo/");
+  EXPECT_EQ("/foo/bar/", SourceDirForPath(root,
+            base::FilePath("/foo/bar/")).value());
+  EXPECT_EQ("/", SourceDirForPath(root,
+            base::FilePath("/")).value());
+  EXPECT_EQ("//", SourceDirForPath(root,
+            base::FilePath("/source/foo")).value());
+  EXPECT_EQ("//bar/", SourceDirForPath(root,
+            base::FilePath("/source/foo/bar/")).value());
+  EXPECT_EQ("//bar/baz/", SourceDirForPath(root,
+            base::FilePath("/source/foo/bar/baz/")).value());
+
+  // Should be case-sensitive.
+  EXPECT_EQ("/SOURCE/foo/bar/", SourceDirForPath(root,
+            base::FilePath("/SOURCE/foo/bar/")).value());
+#endif
+}
+
 TEST(FilesystemUtils, GetToolchainDirs) {
   BuildSettings build_settings;
   build_settings.SetBuildDir(SourceDir("//out/Debug/"));