Built-in Variables and Functions

Remarks#

AutoHotkey comes with many built-in functions and variables which can be used anywhere inside a script.
For a full list including explanations, see:

Determining the User Idle Time

if(A_TimeIdlePhysical > 60000) { ; 60,000 milliseconds
    WinClose, ahk_class Chrome_WidgetWin_1
    MsgBox, Google Chrome was closed due to user inactivity.
}

This check could be done periodically, e.g. using SetTimer.

Auto-insert current weekday’s name

This example inserts/sends the current day of the week’s full name (e.g. Sunday) whenever Ctrl + Alt + D is pressed:

^!d::Send, %A_DDDD%

Extract string parts using RegEx

myDebt := 9000
index  := RegExMatch("You owe me $42", "\$(\d+)", dollars)
if(index > 0) { ; indices are usually 1-based in AHK
    myDebt += dollars1
    MsgBox, Current debt: %myDebt%
}

Result:

Current debt: 9042

Trim a string

myString := "  hello, Trim()! "
trimmed  := Trim(myString)
FileAppend, % trimmed "`n", TrimmedStrings.txt

Note that Trim() will not manipulate the original string, but return a new one which should be stored or output somewhere.