#racket on 2019-03-25 — irc logs at freenode.irclog.whitequark.org

2019-03-10 18:20 lexi-lambda changed the topic of #racket to: Racket v7.2 has been released: https://blog.racket-lang.org/2019/01/racket-v7-2.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

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02:45 <technomancy> any idea why the draw-ellipse calls here are resulting in non-circular ellipses despite being called with the same value for width and height? https://p.hagelb.org/v2.rkt.html

02:46 <technomancy> output: https://p.hagelb.org/kb2.svg

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03:23 <technomancy> wait the x and y of draw-ellipse are for the top left of the bounding box, not one of the focal points?

03:23 <technomancy> wat

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17:39 <badkins> Anyone familiar with using Racket's subprocess procedure with multiple arguments, in particular when some of those arguments contain spaces?

17:41 <badkins> I discovered that the first line below succeeds where the second line fails:

17:41 <badkins> (subprocess #f #f #f "/usr/local/bin/foo" "-trace" "Y:L:ssl:123"))

17:41 <badkins> (subprocess #f #f #f "/usr/local/bin/foo" "-trace Y:L:ssl:123"))

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17:42 <badkins> so something is going on with args & spaces, and I need to pass an arg with an embedded space, such as the following:

17:42 <badkins> (subprocess #f #f #f "/usr/local/bin/foo" "-trace" "-xrm 's.xyz: true'" "Y:L:ssl:123"))

17:43 <tonyg> badkins: how would you write it on the shell command-line?

17:43 <badkins> concat all those strings with spaces

17:44 <tonyg> so like this: $ /usr/local/bin/foo -trace -xrm 's.xyz: true' Y:L:ssl:123

17:44 <tonyg> ?

17:44 <badkins> yes

17:44 <tonyg> cool. so,

17:44 <tonyg> shell will split that line up into an array of strings at every space on the line except the one in single-quotes

17:44 <tonyg> the single-quotes will not be included in the array of strings

17:44 <tonyg> the resulting array will be handed off to execv

17:45 <tonyg> subprocess takes an execv-style array of strings

17:45 <tonyg> so you want:

17:45 <badkins> ah

17:45 <tonyg> (subprocess #f #f #f "/usr/local/bin/foo" "-trace" "-xrm" "s.xyz: true" "Y:L:ssl:123")

17:46 <tonyg> an alternative is to build a line of input for the shell to then take apart again :-) but that's hideously error prone. much better to build the execv-style array yourself imo

17:46 <badkins> Thanks!

17:46 <tonyg> yw

17:48 <badkins> Wow - just tried that, and it worked flawlessly. Been struggling with this for a bit today. If you're at RacketCon - lunch or dinner is on me!

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21:42 <tonyg> badkins: :) glad it worked for you! Won't be at racketcon this year sadly, so pick a random attendee and shout them a lunch instead if you like :)

21:44 <badkins> Sounds good :)

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