Use AutoHotKey + Google for spell-checking: in Gvim.exe (Vim on Windows)

spell_check_Vim.ahk

; How it works? Well, when you type a single word with erranous spellings to Google, it way "Did you mean ...". 
; This AHK script grab that piece of Google Suggestion and pass it back to the clipboard.

; Purpose: select the world to the left of the cursor, and correct using Google:
; Credits: AutoHotkey Community (Linfeng is not able to find the original source.)
; Please comment if you are able to find the source of those fantastic regex expressions 

;; Usage: use Ctrl + Alt + Shift + H, to select the word to the left of your
;; active cursor, and replace it with whatever Google corrects it to be.
;; Warning: only work best for very-close, but wrong, spellings.

;; Hint on Vim usage: as long as you type a long-wrong-word, Google will try to correct, and the `cw` keystrokes towards the end of this script will convert that whole thing into something reasonable.


#IfWinActive ahk_exe gvim.exe
    ; Upgraded: select the world to the left of the cursor, and correct using Google:
    ^+!h::
    send {esc}
    send b
    send viw
    clipback := ClipboardAll
    clipboard=
    Send ^c
    ClipWait, 0
    UrlDownloadToFile % "https://www.google.com/search?q=" . clipboard, temp
    FileRead, contents, temp
    FileDelete temp
    if (RegExMatch(contents, "(Showing results for|Did you mean:)</span>.*?>(.*?)</a>", match)) {
    StringReplace, clipboard, match2, <b><i>,, All
    StringReplace, clipboard, clipboard, </i></b>,, All
    clipboard := RegExReplace(clipboard, "&#39;", "'")
    clipboard := RegExReplace(clipboard, "&amp;", "&")
    }
    send cw
    Send ^v
    Sleep 500
    clipboard := clipback
    return
#IfWinActive