[clang-tools-extra] [run-clang-tidy.py] Add option to ignore source files from compilation database (PR #82416)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-tools-extra

@llvm/pr-subscribers-clang-tidy

Author: Alexander (duddel)

<details>
<summary>Changes</summary>

I added the option `-source-ignore` to the `run-clang-tidy.py` script in the clang-tools-extra.

This option allows for handing over a regex, to ignore matching source files from the compilation database (not run `clang-tidy` on them).

**Why "ignore" instead of "filter"?**
I found it more useful to actively filter out (ignore) source files, rather than the inverse logic. One usually knows where the source files reside and can now easily ignore e.g. the `thirdparty/` directory.

---
Full diff: https://github.com/llvm/llvm-project/pull/82416.diff


1 Files Affected:

- (modified) clang-tools-extra/clang-tidy/tool/run-clang-tidy.py (+15) 


``````````diff
diff --git a/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py b/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
index 70f8cbcdcb2f11..ba4314dfb50aa1 100755
--- a/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
+++ b/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
@@ -300,6 +300,12 @@ def main():
         "the main file of each translation unit are always "
         "displayed.",
     )
+    parser.add_argument(
+        "-source-ignore",
+        default=None,
+        help="Regular expression matching the names of the "
+        "source files from compilation database to ignore.",
+    )
     parser.add_argument(
         "-line-filter",
         default=None,
@@ -462,6 +468,15 @@ def main():
         [make_absolute(entry["file"], entry["directory"]) for entry in database]
     )
 
+    # Remove source file to be ignored from database.
+    if args.source_ignore:
+        try:
+            source_ignore_re = re.compile(args.source_ignore)
+        except:
+            print("Error: unable to compile regex from arg -source-ignore.", file=sys.stderr)
+            sys.exit(1)
+        files = {f for f in files if not source_ignore_re.match(f)}
+
     max_task = args.j
     if max_task == 0:
         max_task = multiprocessing.cpu_count()

``````````

</details>


https://github.com/llvm/llvm-project/pull/82416