git aliases for managing autogenerated code

.gitconfig

# autogen files are files with diff unset in .gitattribute
ls-check-attr-diff = "!git ls-files --exclude-standard --modified | git check-attr --stdin diff"
ls-autogen         = "!git ls-check-attr-diff | grep    'diff: unset' | sed 's/: diff:.*//'"
ls-no-autogen      = "!git ls-check-attr-diff | grep -v 'diff: unset' | sed 's/: diff:.*//'"
discard-autogen    = "!git ls-autogen    | xargs git checkout --"
add-autogen        = "!git ls-autogen    | xargs git add"
add-no-autogen     = "!git ls-no-autogen | xargs git add"