Code Formatter

This skill automatically formats code files after editing or writing, using project-specific formatters.

How It Works

When you edit or write code files, a post-edit hook runs to format the file using:

• Python: black or autopep8
• JavaScript/TypeScript: prettier
• Go: gofmt
• Rust: rustfmt

Instructions

1. Edit or write code as normal
2. Automatic formatting happens via the PostToolUse hook
3. Formatted code is applied back to the file

Hook Script

The hook script (.claude/hooks/format-code.sh) should:

• Detect file type from extension
• Run appropriate formatter
• Handle errors gracefully
• Return formatted content

Example Hook Script

#!/bin/bash
# .claude/hooks/format-code.sh

FILE_PATH=$(echo "$1" | jq -r '.file_path')
EXT="${FILE_PATH##*.}"

case "$EXT" in
  py)
    black "$FILE_PATH" 2>/dev/null || autopep8 -i "$FILE_PATH"
    ;;
  js|jsx|ts|tsx)
    prettier --write "$FILE_PATH" 2>/dev/null
    ;;
  go)
    gofmt -w "$FILE_PATH"
    ;;
  rs)
    rustfmt "$FILE_PATH"
    ;;
esac

exit 0

Setup

1. Create the hook script at .claude/hooks/format-code.sh
2. Make it executable: chmod +x .claude/hooks/format-code.sh
3. Install formatters for your languages