chore: import upstream snapshot with attribution

.github/utils/pyproject_to_requirements.py

@@ -0,0 +1,53 @@
+import argparse
+import re
+import sys
+from pathlib import Path
+
+import toml
+
+matcher = re.compile(r"farm-haystack\[(.+)\]")
+parser = argparse.ArgumentParser(
+    prog="pyproject_to_requirements.py", description="Convert pyproject.toml to requirements.txt"
+)
+parser.add_argument("pyproject_path")
+parser.add_argument("--extra", default="")
+
+
+def resolve(target: str, extras: dict, results: set) -> None:
+    """
+    Resolve the dependencies for a given target.
+    """
+    if target not in extras:
+        results.add(target)
+        return
+
+    for t in extras[target]:
+        m = matcher.match(t)
+        if m:
+            for i in m.group(1).split(","):
+                resolve(i, extras, results)
+        else:
+            resolve(t, extras, results)
+
+
+def main(pyproject_path: Path, extra: str = "") -> None:
+    """
+    Convert a pyproject.toml file to a requirements.txt file.
+    """
+    content = toml.load(pyproject_path)
+    # basic set of dependencies
+    deps = set(content["project"]["dependencies"])
+
+    if extra:
+        extras = content["project"]["optional-dependencies"]
+        resolve(extra, extras, deps)
+
+    sys.stdout.write("\n".join(sorted(deps)))
+    sys.stdout.write("\n")
+
+
+if __name__ == "__main__":
+    args = parser.parse_args()
+    pyproject_path = Path(args.pyproject_path).absolute()
+
+    main(pyproject_path, args.extra)