logchanged() {
  local thiscommit
  local prevcommit
  (( numcommits < 0 )) || unset numcommits
  while read prevcommit; do
    if [[ $thiscommit && $prevcommit ]]; then
      printf -- '========================================\n'
      printf -- '%s\n' "$thiscommit"
      printf -- '----------------------------------------\n'
      git diff --name-only "$thiscommit" "$prevcommit"
      echo
    fi
    thiscommit="$prevcommit"
  done < <(git log --pretty=format:%H)
}