Summary

Add git-aware flags to reduce shell piping in common CI/pre-commit workflows.

Motivation

Currently users must pipe git output:

git diff --name-only main | loq check -

Native flags make the common case easy:

loq check --staged
loq check --diff main

Design

New flags (on check command):

• --staged - Check only files in the git staging area
• --diff <ref> - Check files changed since ref (e.g., main, origin/main..HEAD)

Behavior with paths: Intersect

• loq check src/ --staged checks only staged files within src/
• This is the most intuitive behavior

Git not available: Hard error with helpful message

• "error: --staged requires git, but git is not available"

Implementation notes:

• Shell out to git diff --name-only under the hood
• Reuse existing stdin/path-list logic
• Filter to only files (not directories) that exist

Tasks

• Add --staged flag to check command
• Add --diff <ref> flag to check command
• Implement git command execution
• Handle intersection with path arguments
• Add clear error when git unavailable
• Integration tests for git workflows
• Document in README