On Monday, May 19, 2014 10:24:42 PM UTC+2, Gabriel Gonzalez wrote: > > It reads from standard input so you either have to type some lines in and > hit Ctrl-D or pipe a file to standard input using the shell. >
So it is actually `Pipes.Prelude.fold" that makes the program to wait for the EOF signal before returning `ls` in ls <- purely fold (lastN 10) stdinLn On May 19, 2014 4:17 PM, "Pierre R" <[email protected] <javascript:>> > wrote: > >> >> >> On Monday, May 12, 2014 4:27:37 AM UTC+2, Gabriel Gonzalez wrote: >>> >>> Earlier today I wrote up a fold for somebody else for retrieving the >>> last N elements of a sequence. That's the non-trivial bit: >>> >>> http://lpaste.net/103997<http://www.google.com/url?q=http%3A%2F%2Flpaste.net%2F103997&sa=D&sntz=1&usg=AFQjCNGn-hu-CTTeuqPcUTfgK2xhH7QjHg> >>> >>> >> I am almost ashamed to ask but I fail to see why the `main` (in the above >> lpaste) does not output a thing >> >> while it works as expected with a file >> >> main = withFile "test" ReadMode $ \hIn -> do >> ls <- purely fold (lastN 5) $ P.fromHandle hIn >> runEffect $ for (each ls) (lift . putStrLn) >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Haskell Pipes" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected]<javascript:> >> . >> > -- You received this message because you are subscribed to the Google Groups "Haskell Pipes" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected].
