Re: [racket-users] Converting Windows line-endings for arbitrary ports

[Greg Hendershott]

Could you use `read-line`, supplying 'any for the optional `mode` argument?

  
https://docs.racket-lang.org/reference/Byte_and_String_Input.html#(def._((quote._~23~25kernel)._read-line))


If reading in line-sized chunks would be awkward for your existing
code: I suppose you add a second pipe just to do this aspect? :)

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[racket-users] Converting Windows line-endings for arbitrary ports

[Philip McGrath]

I would like to apply the same line-ending conversion that open-input-file
with a #:mode of 'text does on Windows to arbitrary input ports, like
Racket-level pipes (in the sense of make-pipe).

Specifically, I have an external program that I invoke with system* which
reads from and writes to standard IO. On Windows, I have discovered
(painfully), it writes "\r\n" line endings in its output, but I want to
read "\n" line endings on all platforms. Elsewhere I do this by calling IO
functions with #:mode 'text, but there doesn't seem to be an equivalent
transformation for Racket pipes or ports in general. It looks like the
conversion for open-input-file and friends is implemented in C as part of
rktio
;
it doesn't seem to do be available at the Racket level. I might be able to
use reencode-input-port  with its ability to convert newlines, but it
doesn't seem to be precisely the same transformation as open-input-file.
Likewise, I could probably implement the right transformation myself, but
I'm concerned about introducing subtle bugs, especially because I don't
have ready access to a Windows machine for testing.

Is there an existing solution for this?

Right now, my workaround is to have the external program write to a
temporary file, then read in the temporary file with #:mode 'text.

-Philip

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