Tool Locations

• clang-format: ../../../prebuilts/clang/ohos/linux-x86_64/llvm/bin/clang-format

• clang-format-diff.py: ../../../prebuilts/clang/ohos/linux-x86_64/llvm/share/clang/clang-format-diff.py

Approach

Use clang-format-diff.py which is designed specifically for this use case - it reads a diff from stdin and only applies formatting to lines that were changed.

Working Command

Navigate to repo root and run:

git diff HEAD -- 'graphic_2d//*.cpp' 'graphic_2d//*.h' 2>/dev/null |
python3 prebuilts/clang/ohos/linux-x86_64/llvm/share/clang/clang-format-diff.py
-p1 -binary prebuilts/clang/ohos/linux-x86_64/llvm/bin/clang-format -i

Why This Works

• git diff HEAD

• Shows all unstaged changes relative to HEAD

• -- 'graphic_2d//*.cpp' 'graphic_2d//*.h'

• Filters to C++ source files

• clang-format-diff.py

• Reads the diff and only formats changed lines

• -p1

• Strips one path component (graphic_2d/ ) from diff paths

• -binary ...

• Specifies the clang-format executable to use

• -i

• Applies edits directly to files

Important Notes

• Must run from repo root of OpenHarmony so file paths in the diff match actual file locations

• The tool only applies formatting if changed lines violate style rules

• If changed lines are already properly formatted, no changes are made

• This avoids the problem of formatting thousands of unchanged lines in a file