1 files changed, 48 insertions, 0 deletions
diff --git a/mesonbuild/mesondata.py b/mesonbuild/mesondata.py
new file mode 100644
index 0000000..da641fd
--- /dev/null
+++ b/mesonbuild/mesondata.py
@@ -0,0 +1,48 @@
+# Copyright 2021 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import annotations
+
+
+import importlib.resources
+from pathlib import PurePosixPath, Path
+import typing as T
+
+if T.TYPE_CHECKING:
+    from .environment import Environment
+
+class DataFile:
+    def __init__(self, path: str) -> None:
+        self.path = PurePosixPath(path)
+
+    def write_once(self, path: Path) -> None:
+        if not path.exists():
+            data = importlib.resources.read_text( # [ignore encoding] it's on the next lines, Mr. Lint
+                    ('mesonbuild' / self.path.parent).as_posix().replace('/', '.'),
+                    self.path.name,
+                    encoding='utf-8')
+            path.write_text(data, encoding='utf-8')
+
+    def write_to_private(self, env: 'Environment') -> Path:
+        try:
+            resource = importlib.resources.files('mesonbuild') / self.path
+            if isinstance(resource, Path):
+                return resource
+        except AttributeError:
+            # fall through to python 3.7 compatible code
+            pass
+
+        out_file = Path(env.scratch_dir) / 'data' / self.path.name
+        out_file.parent.mkdir(exist_ok=True)
+        self.write_once(out_file)
+        return out_file