[libcxx-commits] [libcxx] [libc++] Rewrite the IWYU generation (PR #78295)

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``````````bash
darker --check --diff -r a9bfad2b9b04772836827c351a9365a7cbddcba0...ba2481c61141ce0f84bfe040592870c9704a4528 libcxx/utils/generate_iwyu_mapping.py libcxx/utils/libcxx/header_information.py
``````````

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View the diff from darker here.
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``````````diff
--- generate_iwyu_mapping.py	2024-01-16 15:25:26.000000 +0000
+++ generate_iwyu_mapping.py	2024-01-16 15:31:32.748781 +0000
@@ -38,32 +38,42 @@
         return ["functional"]
     elif header == "__fwd/pair.h":
         return ["utility"]
     elif header == "__fwd/subrange.h":
         return ["ranges"]
-    elif re.match("__fwd/(.+)[.]h", header): # Handle remaining forward declaration headers
+    elif re.match(
+        "__fwd/(.+)[.]h", header
+    ):  # Handle remaining forward declaration headers
         return [re.match("__fwd/(.+)[.]h", header).group(1)]
-    elif re.match("__(.+?)/.+", header): # Handle detail headers for things like <__algorithm/foo.h>
+    elif re.match(
+        "__(.+?)/.+", header
+    ):  # Handle detail headers for things like <__algorithm/foo.h>
         return [re.match("__(.+?)/.+", header).group(1)]
     else:
         return None
 
 def main():
-    mappings = [] # Pairs of (header, public_header)
+    mappings = []  # Pairs of (header, public_header)
     for header in libcxx.header_information.all_headers:
         public_headers = IWYU_mapping(header)
         if public_headers is not None:
             mappings.extend((header, public) for public in public_headers)
 
     # Validate that we only have valid public header names -- otherwise the mapping above
     # needs to be updated.
-    for (header, public) in mappings:
-        assert public in libcxx.header_information.public_headers, f"{header}: Header {public} is not a valid header"
+    for header, public in mappings:
+        assert (
+            public in libcxx.header_information.public_headers
+        ), f"{header}: Header {public} is not a valid header"
 
     with open(libcxx.header_information.include / "libcxx.imp", "w") as f:
         f.write("[\n")
-        for (header, public) in sorted(mappings):
-            f.write("""  {{ include: [ "<{}>", "private", "<{}>", "public" ] }},\n""".format(header, public))
+        for header, public in sorted(mappings):
+            f.write(
+                """  {{ include: [ "<{}>", "private", "<{}>", "public" ] }},\n""".format(
+                    header, public
+                )
+            )
         f.write("]\n")
 
 if __name__ == "__main__":
     main()

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https://github.com/llvm/llvm-project/pull/78295