AutoHotkey Logging function for debug and other uses since there's nothing native that seems to work well for this.

DebugLogger.ahk

DebugLogger(logText, debugLevel:="DEBUG") {
    ; Debug logging functionality for AutoHotkey (AHK).
    ; Creates one log file per day, and appends date/time to each log line.
    ; Uses debug levels: DEBUG, INFO, WARNING, ERROR, CRITICAL.

    FormatTime, CurrentDate,, yyyy-MM-dd
    FormatTime, CurrentDateTime,, yyyy-MM-dd hh:mm:ss
    IfNotExist, .\log\
        FileCreateDir, .\log\

    stdout := FileOpen(".\log\" CurrentDate ".log", "a")
    if (logText == "") {
        stdout.WriteLine(CurrentDateTime " - No log text provided - WARNING")
    } else if (InStr("DEBUG,INFO,WARNING,ERROR,CRITICAL", debugLevel) == 0) {
        stdout.WriteLine(CurrentDateTime " - Invalid debug level provided - CRITICAL")
    } else {
        stdout.WriteLine(CurrentDateTime " - " logText " - " debugLevel)
    }
}