ohmyzsh/plugins/sudo/sudo.plugin.zsh

# ------------------------------------------------------------------------------
# Description
# -----------
#
# sudo or sudoedit will be inserted before the command
#
# ------------------------------------------------------------------------------
# Authors
# -------
#
# * Dongweiming <ciici123@gmail.com>
# * Subhaditya Nath <github.com/subnut>
# * Marc Cornellà <github.com/mcornella>
#
# ------------------------------------------------------------------------------

__sudo-replace-buffer() {
  local old=$1 new=$2 space=${2:+ }
  if [[ ${#LBUFFER} -le ${#old} ]]; then
    RBUFFER="${space}${BUFFER#$old }"
    LBUFFER="${new}"
  else
    LBUFFER="${new}${space}${LBUFFER#$old }"
  fi
}

sudo-command-line() {
  [[ -z $BUFFER ]] && LBUFFER="$(fc -ln -1)"

  # Save beginning space
  local WHITESPACE=""
  if [[ ${LBUFFER:0:1} = " " ]]; then
    WHITESPACE=" "
    LBUFFER="${LBUFFER:1}"
  fi

  # Get the first part of the typed command and check if it's an alias to $EDITOR
  # If so, locally change $EDITOR to the alias so that it matches below
  if [[ -n "$EDITOR" ]]; then
    local cmd="${${(Az)BUFFER}[1]}"
    if [[ "${aliases[$cmd]} " = (\$EDITOR|$EDITOR)\ * ]]; then
      local EDITOR="$cmd"
    fi
  fi

  if [[ -n $EDITOR && $BUFFER = $EDITOR\ * ]]; then
    __sudo-replace-buffer "$EDITOR" "sudoedit"
  elif [[ -n $EDITOR && $BUFFER = \$EDITOR\ * ]]; then
    __sudo-replace-buffer "\$EDITOR" "sudoedit"
  elif [[ $BUFFER = sudoedit\ * ]]; then
    __sudo-replace-buffer "sudoedit" "$EDITOR"
  elif [[ $BUFFER = sudo\ * ]]; then
    __sudo-replace-buffer "sudo" ""
  else
    LBUFFER="sudo $LBUFFER"
  fi

  # Preserve beginning space
  LBUFFER="${WHITESPACE}${LBUFFER}"
}

zle -N sudo-command-line

# Defined shortcut keys: [Esc] [Esc]
bindkey -M emacs '\e\e' sudo-command-line
bindkey -M vicmd '\e\e' sudo-command-line
bindkey -M viins '\e\e' sudo-command-line