#Requires AutoHotkey v2

; Function to convert Fahrenheit to Celsius
FahrenheitToCelsius(f) {
    return (f - 32) * 5 / 9
}

; Hotstring to trigger the conversion
::fc::
{
    ; Create an InputHook object
    ih := InputHook("V")
    ih.KeyOpt("{Space}{Enter}{Tab}", "E") ; End input on space, enter, or tab
    ih.Start()
    ih.Wait()
    num := ih.Input
    ; Extract the numeric part from the input
    num := RegExReplace(num, "[^\d.-]")
    if (num != "") {
        ; Convert the number to Celsius
        celsius := FahrenheitToCelsius(num)
        ; Delete the original number and "fc"
        Send("{Backspace " StrLen(num) + 2 "}")
        ; Insert the converted value
        Send(Round(celsius, 2) "°C")
    }
    return
}