chore: add the linter to a separate Python script (#2500)

scripts/file_linter.py

@@ -0,0 +1,39 @@
+import os
+import subprocess
+import sys
+
+print("Python {}.{}.{}".format(*sys.version_info))  # Python 3.8
+with open("git_diff.txt") as in_file:
+    modified_files = sorted(in_file.read().splitlines())
+    print("{} files were modified.".format(len(modified_files)))
+    
+    cpp_exts = tuple(".c .c++ .cc .cpp .cu .cuh .cxx .h .h++ .hh .hpp .hxx".split())
+    cpp_files = [file for file in modified_files if file.lower().endswith(cpp_exts)]
+    print(f"{len(cpp_files)} C++ files were modified.")
+    if not cpp_files:
+        sys.exit(0)
+
+        subprocess.run(["clang-tidy", "--fix", "-p=build", "--extra-arg=-std=c++11", *cpp_files, "--"], 
+            check=True, text=True, stderr=subprocess.STDOUT)
+
+        subprocess.run(["clang-format", "-i", "-style=file", *cpp_files], 
+            check=True, text=True, stderr=subprocess.STDOUT)
+
+        upper_files = [file for file in cpp_files if file != file.lower()]
+        if upper_files:
+            print(f"{len(upper_files)} files contain uppercase characters:")
+            print("\n".join(upper_files) + "\n")
+
+        space_files = [file for file in cpp_files if " " in file or "-" in file]
+        if space_files:
+            print(f"{len(space_files)} files contain space or dash characters:")
+            print("\n".join(space_files) + "\n")
+
+        nodir_files = [file for file in cpp_files if file.count(os.sep) != 1]
+        if nodir_files:
+            print(f"{len(nodir_files)} files are not in one and only one directory:")
+            print("\n".join(nodir_files) + "\n")
+
+        bad_files = len(upper_files + space_files + nodir_files)
+        if bad_files:
+            sys.exit(bad_files)