Re-namespace some stuff to Omni

I was getting confused about what is a product and what is internal
infrastructure; I think it is good to keep those things separate. So I moved a
bunch of stuff to an Omni namespace, actually most stuff went there. Only things
that are explicitly external products are still in the Biz namespace.

1 files changed, 61 insertions, 0 deletions

diff --git a/Omni/Cli.hs b/Omni/Cli.hs
new file mode 100644
index 0000000..8ace2a7
--- /dev/null
+++ b/Omni/Cli.hs
@@ -0,0 +1,61 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+
+module Omni.Cli
+  ( Plan (..),
+    main,
+    Docopt.Docopt (..),
+    Docopt.Arguments,
+    Docopt.argument,
+    Docopt.docopt,
+    Docopt.getAllArgs,
+    Docopt.getArg,
+    Docopt.getArgWithDefault,
+    Docopt.longOption,
+    Docopt.shortOption,
+    Docopt.command,
+    has,
+  )
+where
+
+import Alpha
+import qualified Omni.Test as Test
+import qualified System.Console.Docopt as Docopt
+import qualified System.Environment as Environment
+
+-- | Plan is the main data structure that describes a CLI program. It's not the
+-- best name, but it works. This type is parameterized with `cfg` so you can
+-- load configuration from the environment and pass it into your Plan.
+data Plan cfg = Plan
+  { -- | Usage info, shows when given --help
+    help :: Docopt.Docopt,
+    -- | The main function takes arguments and produces effects. Maybe it should
+    -- also take `cfg` as an argument?
+    move :: Docopt.Arguments -> IO (),
+    -- | The test suite for the gram, invoked when 'test' is passed as the first
+    -- argument to the program
+    test :: Test.Tree,
+    -- | Function for cleaning up any files or resources, presumably on
+    -- shutdown. Can be just `pure` if you have nothing to tidy.
+    tidy :: cfg -> IO ()
+  }
+
+-- | The entrypoint for CLI programs, use this in your own `main`.
+main :: Plan cfg -> IO ()
+main Plan {..} =
+  Environment.getArgs
+    /> Docopt.parseArgs help
+    +> \case
+      Left err -> panic <| show err
+      Right args ->
+        if args `has` Docopt.command "test"
+          then Test.run test
+          else
+            if args `has` Docopt.longOption "help" || args `has` Docopt.shortOption 'h'
+              then Docopt.exitWithUsage help
+              else move args
+
+has :: Docopt.Arguments -> Docopt.Option -> Bool
+has = Docopt.isPresent