urbit/pkg/king/lib/Vere/Term/API.hs
2019-09-17 22:22:19 -07:00

39 lines
874 B
Haskell

module Vere.Term.API (Ev(..), Client(..), trace, spin, stopSpin) where
import UrbitPrelude hiding (trace)
import Arvo (Blit, Belt)
-- External Types --------------------------------------------------------------
{-
Input Event for terminal driver:
%blits -- list of blits from arvo.
%trace -- stderr line from runtime.
%blank -- print a blank line
%spinr -- Start or stop the spinner
-}
data Ev = Blits [Blit]
| Trace Text
| Blank
| Spinr (Maybe (Maybe Text))
data Client = Client
{ take :: STM Belt
, give :: Ev -> STM ()
}
-- Utilities -------------------------------------------------------------------
trace :: Client -> Text -> STM ()
trace ts = give ts . Trace
spin :: Client -> Maybe Text -> STM ()
spin ts = give ts . Spinr . Just
stopSpin :: Client -> STM ()
stopSpin ts = give ts (Spinr Nothing)