Saved_Key_State := Ime().getStatus() ; 한글 상태일 때 true
VIM_Command_Mode := false

/**
 * @author zero-plusplus (https://github.com/zero-plusplus)
 * @licence MIT
 * @link https://gist.github.com/zero-plusplus/ad54d19d3e0d34587396c4667fa10079
 */
/**
 * This class provides static methods for getting/setting the state of the [Input Method Editor (IME)](https://en.wikipedia.org/wiki/Input_method).
 */
class Ime {
  /**
   * Get/Set IME status. Enable if `true` IME status, disable if `false`.
   * @static
   * @type {boolean}
   */
  status {
    get {
      return this.get()
    }
    set {
      return this.set(value)
    }
  }
  /**
   * Get a boolean value indicating whether the IME is enabled or disabled.
   * @return {boolean}
   */
  getStatus() {
    static IMC_GETOPENSTATUS := 0x0005

    return !!(this._sendMessage(IMC_GETOPENSTATUS))
  }
  /**
   * Set the IME status.
   * @static
   * @param {boolean} status - Enable if `true`, disable if `false`.
   * @throws Error - Throw an exception if the state setting fails.
   */
  setStatus(status) {
    static IMC_SETOPENSTATUS := 0x006

    errorCode := this._sendMessage(IMC_SETOPENSTATUS, status)
    if (0 < errorCode) {
    ;   throw Exception("Failed to set status. code: " errorCode)
    }
  }
  /**
   * Common process for sending SendMessage.
   * @private
   * @static
   * @param {number} wParam
   * @param {number} [lParam := 0]
   */
  _sendMessage(wParam, lParam := 0) {
    static WM_IME_CONTROL := 0x0283

    return DllCall( "SendMessage"
                  , "UInt", DllCall("imm32\ImmGetDefaultIMEWnd", "Uint", WinActive("A"))
                  , "UInt", msg := WM_IME_CONTROL
                  , "Int", wParam
                  , "Int", lParam )
  }
}

#HotIF WinActive("ahk_exe Code.exe") | WinActive("ahk_exe Obsidian.exe")
Esc:: 
{
    global VIM_Command_Mode
    global Saved_Key_State
    bHangul := Ime().getStatus()
    if bHangul ; 현재 한글키이면,
    {
        Send "{vk15sc138}" ; 한/영 변환키 누르기
    }
    Send "{Esc}" ; V2
    VIM_Command_Mode := true
    Saved_Key_State := bHangul
    return
}

/*
    입력모드로 들어갈 때 이전 한영키로 전환 
*/
i::
+i:: ; I
o::
+o:: ; O
a::
+a:: ; A
{
    global VIM_Command_Mode
    global Saved_Key_State
    ; MsgBox Format("i - {1}, {2}", VIM_Command_Mode, Saved_Key_State) ; Debugging messsage
    Send A_ThisHotkey

    if VIM_Command_Mode
    {
        ; Ime().setStatus(Saved_Key_State)
        if Saved_Key_State ; 편집모드에서 한글 키였으면
        {
            Send "{vk15sc138}" ; 한/영 변환키 누르기
        }
        VIM_Command_Mode := false
    }
    return
}

/*
    Debugging Stuffs
*/
#HotIF
; ^1::
; {
;     MsgBox Ime().getStatus()
; }

; ^2::
; {
;     Ime().setStatus(true)
; }

; ^3::
; {
;     Ime().setStatus(false)
; }

; ^4::
; {
;     Send "{vk15sc138}" ; 한/영 변환키 누르기, V2
; }