Break out the logic to match context/unified diff params into separat… #49

Job	Run time
cargo clippy -- -D warnings (ubuntu-latest)	17s
cargo fmt --all -- --check	8s
cargo clippy -- -D warnings (macOS-latest)	45s
Code Coverage (ubuntu-latest, unix)	2m 11s
cargo check (ubuntu-latest)	30s
cargo clippy -- -D warnings (windows-latest)	28s
Code Coverage (macos-latest, macos)	6m 11s
cargo check (macOS-latest)	35s
GNU test suite	28s
Code Coverage (windows-latest, windows)	51s
cargo check (windows-latest)	1m 11s
cargo test (ubuntu-latest)	48s
cargo test (macOS-latest)	4m 40s
cargo test (windows-latest)	58s
	20m 1s

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