Staging from diffs

Stage all hunks matching the pattern stub: .+:

git diff -U0 \
  | grepdiff -E 'stub: .+' --output-matching hunk \
  | git apply --cached --unidiff-zero

Stage all renames:

git status --porcelain \
  | awk '/^ R { print $2"\n"$4 }' \
  | xargs git add