urbit/pkg/base-dev
Philip Monk e3a8cab943 khan: support inline threads
This allows you to pass a thread directly into khan, instead of passing
a filename.  This has several implications:

- The friction for using threads from an app is significantly lower.
  Consider:

    =/  shed
      =/  m  (strand ,vase)
      ;<  ~  bind:m  (poke:strandio [our %hood] %helm-hi !>('hi'))
      ;<  ~  bind:m  (poke:strandio [our %hood] %helm-hi !>('there'))
      (pure:m !>('product'))
    [%pass /wire %arvo %k %lard %base shed]

- These threads close over their subject, so you don't need to parse
  arguments out from a vase -- you can just refer to them.  The produced
  value must still be a vase.

    ++  hi-ship
      |=  [=ship msg1=@t msg2=@t]
      =/  shed
        =/  m  (strand ,vase)
        ;<  ~  bind:m  (poke:strandio [ship %hood] %helm-hi !>(msg1))
        ;<  ~  bind:m  (poke:strandio [ship %hood] %helm-hi !>(msg2))
        (pure:m !>('product'))
      [%pass /wire %arvo %k %lard %base shed]

- Inline threads can be added to the dojo, though this PR does not add
  any sugar for this.

    =strandio -build-file %/lib/strandio/hoon
    =sh |=  message=@t
        =/  m  (strand:rand ,vase)
        ;<  ~  bind:m  (poke:strandio [our %hood] %helm-hi !>('hi'))
        ;<  ~  bind:m  (poke:strandio [our %hood] %helm-hi !>(message))
        (pure:m !>('product'))
    |pass [%k %lard %base (sh 'the message')]

Implementation notes:
- Review the commits separately: the first is small and implements the
  real feature.  The second moves the strand types into lull so khan can
  refer to them.

- In lull, I wanted to put +rand inside +khan, but this fails to that
  issue that puts the compiler in a loop.  +rand depends on +gall, which
  depends on +sign-arvo, which depends on +khan.  If +rand is in +khan,
  this spins the compiler.  The usual solution is to either move
  everything into the same battery (very ugly here) or break the
  recursion (which we do here).
2022-08-29 21:04:50 -08:00
..
lib khan: support inline threads 2022-08-29 21:04:50 -08:00
mar Merge branch 'master' into next/landscape 2022-06-03 10:48:39 -05:00
sur khan: support inline threads 2022-08-29 21:04:50 -08:00