remove-unused-includes

Development

Look through a given folder to find and safely remove unused includes specifically for Clang-compiled code (using clang-include-cleaner), verifying that referencing targets compile.

QUICK START

How to use this skill

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Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/chromium/chromium/blob/HEAD/agents/skills/remove-unused-includes/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

🧹 Remove Unused Includes Skill

This skill provides a workflow and script to look through a given folder, identify unused includes using clang-include-cleaner, and safely remove them only if the affected targets continue to compile successfully.

Prerequisites

Compilation Database (compile_commands.json): Ensure your compilation database is up-to-date. If not, generate a fresh compilation database using:
```
python3 tools/clang/scripts/generate_compdb.py -p out/Default -o compile_commands.json
```

Workflow Steps

1. Run the Cleanup Script

Run the automated cleanup script located inside this skill's directory (resolve the absolute <skill_directory_path> from the skill metadata):

python3 <skill_directory_path>/scripts/remove_unused_includes.py --src-root . --folder <relative_or_absolute_folder_path>

2. Verify Compilation

The script automatically:

Finds all .cc files in the specified folder.
Detects unused includes using clang-include-cleaner.
Locates all referencing GN targets for each modified file via gn refs.
Edits the file and compiles each referencing target.
Reverts the edit if any compilation errors occur.

3. Review Git Status

Once execution is complete, verify the final changes using git:

git status
git diff