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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 20 Nov 2020

      Magnolia can now run Probably tests in the compiler and report on how many derivations are done and how fast they are, using a @​performance annotation. Here's the report from running the unit tests. (Not all derivations succeed, but that's normal.)pic.twitter.com/HSAUDyZ7Pl

      Probably test report produced by Magnolia at compiletime.
      3 replies 2 retweets 32 likes
      Show this thread
    2. Julien Truffaut‏ @JulienTruffaut 20 Nov 2020
      Replying to @propensive

      Could we use it to measure the optics generation macro in Monocle?

      1 reply 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 20 Nov 2020
      Replying to @JulienTruffaut

      Yes. When I've added the general "macro" functionality to Probably, it would be a matter of wrapping any expression you want to measure in a block like, Macros.test(ctx)("test name") { <your expression> }.check() and it will include "test name" in a report at the end.

      2 replies 0 retweets 1 like
    4. Jon Pretty‏ @propensive 20 Nov 2020
      Replying to @propensive @JulienTruffaut

      The whole thing returns the same value your expression would. `Macros.test(ctx)` gets the "runner" object which records tests. (It needs the black/whitebox context just so that it can hook printing the report into the end of compilation.

      1 reply 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 20 Nov 2020
      Replying to @propensive @JulienTruffaut

      The `check` assertion would normally take a lambda which operates on the expression, and whose outcome will be recorded in the report. I'm going to make it optional, though (so it would just check the expression returns normally).

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 20 Nov 2020
      Replying to @propensive @JulienTruffaut

      You also have the option of choosing your "test name" string dynamically. The runner just records whatever test names it's given, and counts the ones that are the same.

      3:23 AM - 20 Nov 2020
      1 reply 0 retweets 0 likes
        1. Jon Pretty‏ @propensive 20 Nov 2020
          Replying to @propensive @JulienTruffaut

          There is one thing to beware of, though: You can capture the time spent in macro generation, but not any consequential time spent typechecking the macro-generated code that happens outside of the macro.

          0 replies 0 retweets 1 like
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