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Functor Kwcsv.Fold

module Fold: 
functor (Portaline : PF) -> sig .. end
Folding over CSV files, possibly Unicode ones.

It's against my policy to have this library depend on any 3rd-party libraries whose absence might prevent its compilation. I also want to avoid the complexities of conditional compilation.

So, the Kwcsv.Fold module is functorized to push the dependency on Uutf into the app that needs this module.

To use this module to build a Unicode-aware Kwcsv.Fold.fold, just say e.g.: 

        module F = Kwcsv.Fold (Kwcsv.Unicode (Uutf) (struct let encoding = None end))
        module F = Kwcsv.Fold (Kwcsv.Unicode (Uutf) (AUTO))
        module F = Kwcsv.Fold (Kwcsv.Unicode (Uutf) (struct let encoding = Some `UTF_8 end))
and use F.fold.

For an old-fashioned ASCII-only fold, use Kwcsv.Fold.fold.

Parameters:
Portaline : PF 
val fold : ?eol:Kwcsv.eoltype ->
       ?q:string ->
       ?comma:string ->
       ?warn:(int -> unit) ->
       ('a -> int -> string list -> 'a) -> 'a -> Pervasives.in_channel -> 'a
fold ?eol ?q ?comma ?warn func init chan: fold func over records in CSV file open on chan.
Raises CSV when invalid character found after quoted quote
eol : end-of-line type (default: AUTO)
q : quote character (default: '"')
comma : field-separator character (default: ',')
warn : function to handle "EOF in quoted string" warning (default: none)
func : function to fold
init : initial accumulator value
chan : opened input channel