zsh edit-command-line zle widget that sets the cursor position in Vim

edit-command-line.zsh

function edit-command-line() {
  tmpfile=$(mktemp -t zsheditXXXXXXXX.sh)
  print -R - "$PREBUFFER$BUFFER" > $tmpfile
  editor=${VISUAL:-${EDITOR:-vi}}
  args=()
  if [[ "$editor" =~ vim ]]; then
    pb=${#PREBUFFER}
    (( b=pb+CURSOR ))
    args+=("-c" ":call cursor(byte2line($b), ($b - $pb) + 1)")
  fi
  args+=($tmpfile)

  exec </dev/tty
  $editor ${args[@]}

  print -z - "$(<$tmpfile)"
  command rm -f $tmpfile
  zle send-break
}

bindkey '^F' edit-command-line
zle -N edit-command-line