Re: [racket-users] Help needed in file processing idioms

see docs for (read-line) On Sat, Aug 20, 2016 at 5:16 PM, Pekka Niiranen wrote: > Thank you guys, > > > both functions work. Looks like single function (for/or) could be used > if the calling side handles #f, #t and a list. > > Another issue: > > I am planning to

Re: [racket-users] Help needed in file processing idioms

Thank you guys, both functions work. Looks like single function (for/or) could be used if the calling side handles #f, #t and a list. Another issue: I am planning to support both Unix and Windows, but have not found a way to define 'return-linefeed as system-wide default (aside using global

Re: [racket-users] Help needed in file processing idioms

Minor fix: In the first function "read-on-row" you must replace for/first with for/last. Gustavo PS for Pekka: In this case it's better to use for/last and for/or, but in more complicated cases you can try with for/fold. On Fri, Aug 19, 2016 at 10:34 AM, WarGrey Gyoudmon Ju

Re: [racket-users] Help needed in file processing idioms

(define (read-on-row *params*) ;; Returns the last line in "myfile" which contains ;; substring "ON", otherwise #f (call-with-input-file (hash-ref *params* "myfile") (lambda (inp) (for/first ([row (in-lines inp 'return-linefeed)] #:when (string-contains? row

[racket-users] Help needed in file processing idioms

Hello users, I would like to read lines from a file, process each line and return either the success of the operation or the processed line to another function located in another module. Below are two functions that work OK, but are in my opinion "ugly" because they use "set!". It there a