make a csv-reader that takes in an input-port

[yinso.chen@…]

Based on the doc, the csv.ss currently exposes a csv-reader-maker functions that creates a closure over the input port for reading the csv data.

While this is convenient for just reading csv files, it doesn't work well for composing different readers as it doesn't follow the scheme pattern of

(read <input-port>)

.

It would be nice to have a csv-reader-maker that'll make a procedures that takes an input-port so the reader can be composed.