.gitconfig

[alias]
  # keep working (it opens current changed files)
  kw = !git status --porcelain --ignore-submodules | awk '$1 != "D" { print $2}' | xargs $EDITOR
  # previous work (it opens changed files from previous commit)
  pw = !git log -1 --raw | grep ^: | awk '$5 != "D" { print $6}' | xargs $EDITOR

http://explainshell.com/explain?cmd=git+status+--porcelain+--ignore-submodules+%7C+awk+%27%241+%21%3D+%22D%22+%7B+print+%242%7D%27+%7C+xargs+%24EDITOR

http://explainshell.com/explain?cmd=git+log+-1+--raw+%7C+grep+%5E%3A+%7C+awk+%27%245+%21%3D+%22D%22+%7B+print+%246%7D%27+%7C+xargs+%24EDITOR

There's a lot of room for improvement