Text change listener: converts dot to comma as you type

Extensions.kt

/**
 * [this] text manipulation to be applied to
 * converts dot to comma in input field
 * prevents second comma
 * "editing" is used to prevent code to re-execute on recall of doAfterTextChanged after setText()
 */
fun TextInputEditText.dotToComma() {
    // you should set inputType to numberDecimal from xml
    keyListener = DigitsKeyListener.getInstance("1234567890.,")
    var editing = false
    doAfterTextChanged { editable ->
        if (!editing) {
            editing = true
            editable?.let { text ->
                if (text.contains('.', false)) {
                    val dotsReplaced = text.toString().replace('.', ',')
                    if (dotsReplaced.count { it == ',' } > 1) {
                        val index = text.lastIndexOf('.')
                        val commaDeleted = text.toString().removeRange(index, index + 1)
                        setText(commaDeleted)
                        setSelection(text.length - 1)
                    } else {
                        setText(dotsReplaced)
                        setSelection(text.length)
                    }
                    return@let
                }
                if (text.count { it == ',' } > 1) {
                    val index = text.lastIndexOf(',')
                    val lastCommaDeleted = text.toString().removeRange(index, index + 1)
                    setText(lastCommaDeleted)
                    setSelection(text.length - 1)
                }
            }
            editing = false
        }
    }
}