1 files changed, 72 insertions, 0 deletions
diff --git a/testing/web-platform/tests/tools/manifest/utils.py b/testing/web-platform/tests/tools/manifest/utils.py
new file mode 100644
index 0000000000..7ccd3afb71
--- /dev/null
+++ b/testing/web-platform/tests/tools/manifest/utils.py
@@ -0,0 +1,72 @@
+import os
+import subprocess
+import sys
+from typing import Any, Callable, Generic, Optional, Text, TypeVar
+T = TypeVar("T")
+
+
+def rel_path_to_url(rel_path: Text, url_base: Text = "/") -> Text:
+    assert not os.path.isabs(rel_path), rel_path
+    if url_base[0] != "/":
+        url_base = "/" + url_base
+    if url_base[-1] != "/":
+        url_base += "/"
+    return url_base + rel_path.replace(os.sep, "/")
+
+
+def from_os_path(path: Text) -> Text:
+    assert os.path.sep == "/" or sys.platform == "win32"
+    if "/" == os.path.sep:
+        rv = path
+    else:
+        rv = path.replace(os.path.sep, "/")
+    if "\\" in rv:
+        raise ValueError("path contains \\ when separator is %s" % os.path.sep)
+    return rv
+
+
+def to_os_path(path: Text) -> Text:
+    assert os.path.sep == "/" or sys.platform == "win32"
+    if "\\" in path:
+        raise ValueError("normalised path contains \\")
+    if "/" == os.path.sep:
+        return path
+    return path.replace("/", os.path.sep)
+
+
+def git(path: Text) -> Optional[Callable[..., Text]]:
+    def gitfunc(cmd: Text, *args: Text) -> Text:
+        full_cmd = ["git", cmd] + list(args)
+        try:
+            return subprocess.check_output(full_cmd, cwd=path, stderr=subprocess.STDOUT).decode('utf8')
+        except Exception as e:
+            if sys.platform == "win32" and isinstance(e, WindowsError):
+                full_cmd[0] = "git.bat"
+                return subprocess.check_output(full_cmd, cwd=path, stderr=subprocess.STDOUT).decode('utf8')
+            else:
+                raise
+
+    try:
+        # this needs to be a command that fails if we aren't in a git repo
+        gitfunc("rev-parse", "--show-toplevel")
+    except (subprocess.CalledProcessError, OSError):
+        return None
+    else:
+        return gitfunc
+
+
+class cached_property(Generic[T]):
+    def __init__(self, func: Callable[[Any], T]) -> None:
+        self.func = func
+        self.__doc__ = getattr(func, "__doc__")
+        self.name = func.__name__
+
+    def __get__(self, obj: Any, cls: Optional[type] = None) -> T:
+        if obj is None:
+            return self  # type: ignore
+
+        # we can unconditionally assign as next time this won't be called
+        assert self.name not in obj.__dict__
+        rv = obj.__dict__[self.name] = self.func(obj)
+        obj.__dict__.setdefault("__cached_properties__", set()).add(self.name)
+        return rv