Clangd

tools/clangd_headers.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+"""Runs only in the build image, during configure/lsp, never server startup."""
+import json
+import pathlib
+import re
+import subprocess
+import sys
+
+def header_roots(config):
+  roots = set()
+  for driver in config["query_drivers"]:
+    for language in ("c", "c++"):
+      result = subprocess.run([driver, "-E", "-v", "-x", language, "-"], input="",
+                              stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, check=True)
+      listing = False
+      for line in result.stderr.splitlines():
+        if line == "#include <...> search starts here:":
+          listing = True
+        elif line == "End of search list.":
+          listing = False
+        elif listing:
+          roots.add(pathlib.Path(line.strip()).resolve())
+  version = subprocess.check_output([config["executable"], "--version"], text=True)
+  major = re.search(r"version (\d+)", version).group(1)
+  builtin = pathlib.Path(f"/usr/lib/llvm-{major}/lib/clang/{major}/include")
+  roots.add(builtin)
+  roots.update(pathlib.Path(root) for root in config["header_roots"])
+  for root in roots:
+    if not root.is_dir() or root == pathlib.Path("/"):
+      raise ValueError(f"missing or invalid header directory: {root}")
+  return sorted(str(root) for root in roots if not any(parent in roots for parent in root.parents))
+
+if __name__ == "__main__":
+  print(json.dumps(header_roots(json.loads(sys.argv[1]))))