[Haskell-cafe] "Dynamic" CSV Parsing - Parsec

Hello, I'm trying to build a CSV parser that can dynamically assemble a parser from the values of the first line. As the most simple example the parse of the first line would return a parser with which subsequent lines would then be parsed. This parser would, for instance, only parse lines with the exact number of columns as found in the first line. Where I eventually want to go is a bit more complicated than this, but for now I'd be grateful for suggestions on how to go about the simple case. Best regards Günther