###### IntelliSense -- by Rajat (requires XP/2k/NT)

This script watches while you edit an AutoHotkey script. When it sees you type a command followed by a comma or space, it displays that command's parameter list to guide you. In addition, you can press Ctrl+F1 (or another hotkey of your choice) to display that command's page in the help file. To dismiss the parameter list, press Escape or Enter.

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    ; Requires v1.0.41+

    ; CONFIGURATION SECTION: Customize the script with the following variables.

    ; The hotkey below is pressed to display the current command's page in the
    ; help file:
    I_HelpHotkey = ^F1

    ; The string below must exist somewhere in the active window's title for
    ; IntelliSense to be in effect while you're typing.  Make it blank to have
    ; IntelliSense operate in all windows.  Make it Pad to have it operate in
    ; editors such as Metapad, Notepad, and Textpad.  Make it .ahk to have it
    ; operate only when a .ahk file is open in Notepad, Metapad, etc.
    I_Editor = pad

    ; If you wish to have a different icon for this script to distinguish it from
    ; other scripts in the tray, provide the filename below (leave blank to have
    ; no icon). For example: E:\stuff\Pics\icons\GeoIcons\Information.ico
    I_Icon =

    ; END OF CONFIGURATION SECTION (do not make changes below this point unless
    ; you want to change the basic functionality of the script).

    SetKeyDelay, 0
    #SingleInstance

    if I_HelpHotkey <>
        Hotkey, %I_HelpHotkey%, I_HelpHotkey

    ; Change tray icon (if one was specified in the configuration section above):
    if I_Icon <>
        IfExist, %I_Icon%
            Menu, Tray, Icon, %I_Icon%

    ; Determine AutoHotkey's location:
    RegRead, ahk_dir, HKEY_LOCAL_MACHINE, SOFTWARE\AutoHotkey, InstallDir
    if ErrorLevel  ; Not found, so look for it in some other common locations.
    {
        if A_AhkPath
            SplitPath, A_AhkPath,, ahk_dir
        else IfExist ..\..\AutoHotkey.chm
            ahk_dir = ..\..
        else IfExist %A_ProgramFiles%\AutoHotkey\AutoHotkey.chm
            ahk_dir = %A_ProgramFiles%\AutoHotkey
        else
        {
            MsgBox Could not find the AutoHotkey folder.
            ExitApp
        }
    }

    ahk_help_file = %ahk_dir%\AutoHotkey.chm

    ; Read command syntaxes:
    Loop, Read, %ahk_dir%\Extras\Editors\Syntax\Commands.txt
    {
        I_FullCmd = %A_LoopReadLine%

        ; Directives have a first space instead of a first comma.
        ; So use whichever comes first as the end of the command name:
        StringGetPos, I_cPos, I_FullCmd, `,
        StringGetPos, I_sPos, I_FullCmd, %A_Space%
        if (I_cPos = -1 or (I_cPos > I_sPos and I_sPos <> -1))
            I_EndPos := I_sPos
        else
            I_EndPos := I_cPos

        if I_EndPos <> -1
            StringLeft, I_CurrCmd, I_FullCmd, %I_EndPos%
        else  ; This is a directive/command with no parameters.
            I_CurrCmd = %A_LoopReadLine%

        StringReplace, I_CurrCmd, I_CurrCmd, [,, All
        StringReplace, I_CurrCmd, I_CurrCmd, %A_Space%,, All
        StringReplace, I_FullCmd, I_FullCmd, ``n, `n, All
        StringReplace, I_FullCmd, I_FullCmd, ``t, `t, All

        ; Make arrays of command names and full cmd syntaxes:
        I_Cmd%A_Index% = %I_CurrCmd%
        I_FullCmd%A_Index% = %I_FullCmd%
    }

    ; Use the Input command to watch for commands that the user types:
    Loop
    {
        ; Editor window check:
        WinGetTitle, ActiveTitle, A
        IfNotInString, ActiveTitle, %I_Editor%
        {
            ToolTip
            Sleep, 500
            Continue
        }

        ; Get all keys till endkey:
        Input, I_Word, V, {enter}{escape}{space}`,
        I_EndKey = %ErrorLevel%

        ; Tooltip is hidden in these cases:
        if I_EndKey in EndKey:Enter,EndKey:Escape
        {
            ToolTip
            Continue
        }

        ; Editor window check again!
        WinGetActiveTitle, ActiveTitle
        IfNotInString, ActiveTitle, %I_Editor%
        {
            ToolTip
            Continue
        }

        ; Compensate for any indentation that is present:
        StringReplace, I_Word, I_Word, %A_Space%,, All
        StringReplace, I_Word, I_Word, %A_Tab%,, All
        if I_Word =
            Continue

        ; Check for commented line:
        StringLeft, I_Check, I_Word, 1
        if (I_Check = ";" or I_Word = "If")  ; "If" seems a little too annoying to show tooltip for.
            Continue

        ; Match word with command:
        I_Index =
        Loop
        {
            ; It helps performance to resolve dynamic variables only once.
            ; In addition, the value put into I_ThisCmd is also used by the
            ; I_HelpHotkey subroutine:
            I_ThisCmd := I_Cmd%A_Index%
            if I_ThisCmd =
                break
            if (I_Word = I_ThisCmd)
            {
                I_Index := A_Index
                I_HelpOn = %I_ThisCmd%
                break
            }
        }

        ; If no match then resume watching user input:
        if I_Index =
            Continue

        ; Show matched command to guide the user:
        I_ThisFullCmd := I_FullCmd%I_Index%
        ToolTip, %I_ThisFullCmd%, A_CaretX, A_CaretY + 20
    }

    I_HelpHotkey:
    WinGetTitle, ActiveTitle, A
    IfNotInString, ActiveTitle, %I_Editor%, Return

    ToolTip  ; Turn off syntax helper since there is no need for it now.

    SetTitleMatchMode, 1  ; In case it's 3. This setting is in effect only for this thread.
    IfWinNotExist, AutoHotkey Help
    {
        IfNotExist, %ahk_help_file%
        {
            MsgBox, Could not find the help file: %ahk_help_file%.
            return
        }
        Run, %ahk_help_file%
        WinWait, AutoHotkey Help
    }

    if I_ThisCmd =  ; Instead, use what was most recently typed.
        I_ThisCmd := I_Word

    ; The above has set the "last found" window which we use below:
    WinActivate
    WinWaitActive
    StringReplace, I_ThisCmd, I_ThisCmd, #, {#}  ; Replace leading #, if any.
    Send, !n{home}+{end}%I_HelpOn%{enter}
    return