chore: slight restructuring of check-clang-tidy.sh (#6282)

scripts/check-clang-tidy.sh

@@ -1,12 +1,32 @@
 #!/usr/bin/env bash
 
+# example usage: FAST=1 ./scripts/check-clang-tidy.sh --checks '-*,modernize-return-braced-init-list' --fix
+
 set -eu
 
 clang-tidy --version
 
-find \
-    src/ \
-    tests/src/ \
-    benchmarks/src/ \
-    mocks/include/ \
-    -type f \( -name "*.hpp" -o -name "*.cpp" \) -print0 | parallel -0 -j16 -I {} clang-tidy --quiet "$@" "{}"
+if [ "$FAST" = "1" ]; then
+    if ! command -v parallel >/dev/null 2>&1; then
+        echo "Missing parallel command"
+        exit 1
+    fi
+
+    NUM_TIDY_JOBS=${NUM_TIDY_JOBS:-$(nproc)}
+
+    echo "Running clang-tidy with args '$*', with ${NUM_TIDY_JOBS} jobs"
+
+    find . \( \
+        -regex '\./src/.*\.\(hpp\|cpp\)' -o \
+        -regex '\./tests/src/.*\.\(hpp\|cpp\)' -o \
+        -regex '\./benchmarks/src/.*\.\(hpp\|cpp\)' -o \
+        -regex '\./mocks/include/.*\.\(hpp\|cpp\)' \
+        \) | parallel --jobs "$NUM_TIDY_JOBS" --verbose clang-tidy --quiet "$@"
+else
+    find . \( \
+        -regex '\./src/.*\.\(hpp\|cpp\)' -o \
+        -regex '\./tests/src/.*\.\(hpp\|cpp\)' -o \
+        -regex '\./benchmarks/src/.*\.\(hpp\|cpp\)' -o \
+        -regex '\./mocks/include/.*\.\(hpp\|cpp\)' \
+        \) -exec clang-tidy --quiet "$@" {} \;
+fi