 Decides which column we should be on after the given character.
colMove :: IndentSettings -> Int -> Char -> Int
colMove is col '\t' | tabSize is > 1 = col + tabSize is
col
colMove :: IndentSettings -> Int -> Char -> Int
colMove is col '\t' | tabSize is > 1 = col + tabSize is
colMove is col '\t' | tabSize is > 1 = col + tabSize is