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#2Literate Haskell is not visible in .dia blocks

dominic

I am probably missing something but definitions written inside Bird tracks are not visible inside .dia blocks and it seems one has to repeat them.

Here's an example

We define the usual factorial function:

> fact 0 = 1 > fact n = n * fact (n-1)

NOTE: Square brackets below should be replaced by curly braces. Haddock chokes on curly braces.

Here is a green square:

dia = gSq

And another

dia = gSq

Green squares like gSq and blue circles like circle 1 # fc blue are extremely important.

[dia-def]

fact 0 = 1
fact n = n * fact (n-1)

gSq = square (1 / fact 1) # fc green # opacity 0.5 <>
      square (1 / fact 2) # fc blue # opacity 0.5

• Brent YorgeyThu Mar 14 17:23:32 UTC 2013

  Hmm, you're absolutely right. At the moment, BlogLiteratelyD makes no attempt to have the .lhs file itself in scope for diagram definitions.

  Part of what makes this tricky is that you might not always want the .lhs file contents in scope. For example, sometimes people just use .lhs to format/syntax-highlight Haskell code without worrying about having it be a valid Haskell file. And sometimes there may be no Haskell code at all (which confuses the interpreter).

  Anyway, I will try to give it more thought soon and see if I can come up with something that works well.

• Brent YorgeyThu Apr 4 20:19:47 UTC 2013

  Note that in the meantime you can simply import your module itself into any diagrams that want to reference stuff in scope. For example, you could have a file called Foo.hs which looks like this:

  > module Foo where
  
  Here is some text, and some code.
  
  > foo = 5
  
  Here is a diagram:
  
  ```{.dia width='100'}
  import Foo
  dia = hcat (replicate foo (circle 1))
  ```

• Brent YorgeyThu Apr 4 20:20:26 UTC 2013

  Argh, the formatting is horrible. But hopefully you can tell what I mean.

• dominicTue Apr 9 13:24:33 UTC 2013

  I can and it works for some cases. But consider the case where I want to explain the factorial function in my blog post so I define it inside some bird tracks but I also want to use it to generate a diagram. I can put the factorial function inside another module that I can then import both to generate a value and to generate a diagram but I can't show the code the to the reader. Does that make sense?

• Brent YorgeyTue Apr 9 14:28:08 UTC 2013

  No, that's the point, you don't have to put the factorial function inside another module. You make a file called MyBlogPost.lhs. Inside that file you have module MyBlogPost where in some bird tracks and also the definition of factorial in some bird tracks, to show the code to the reader. Then later you have a diagram defined like

  import MyBlogPost
  dia = ... factorial ...

  Does that make sense? So inside MyBlogPost.lhs you can have diagrams which import MyBlogPost itself.

• dominicWed Apr 10 09:40:58 UTC 2013
  • status set to closed

  Apologies. It did make sense.