Move stuff around + add lean and idris experiments

purescript/compose/.gitignore

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+/bower_components/
+/node_modules/
+/.pulp-cache/
+/output/
+/generated-docs/
+/.psc-package/
+/.psc*
+/.purs*
+/.psa*
+/.spago

purescript/compose/packages.dhall

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+{-
+Welcome to your new Dhall package-set!
+
+Below are instructions for how to edit this file for most use
+cases, so that you don't need to know Dhall to use it.
+
+## Use Cases
+
+Most will want to do one or both of these options:
+1. Override/Patch a package's dependency
+2. Add a package not already in the default package set
+
+This file will continue to work whether you use one or both options.
+Instructions for each option are explained below.
+
+### Overriding/Patching a package
+
+Purpose:
+- Change a package's dependency to a newer/older release than the
+    default package set's release
+- Use your own modified version of some dependency that may
+    include new API, changed API, removed API by
+    using your custom git repo of the library rather than
+    the package set's repo
+
+Syntax:
+where `entityName` is one of the following:
+- dependencies
+- repo
+- version
+-------------------------------
+let upstream = --
+in  upstream
+  with packageName.entityName = "new value"
+-------------------------------
+
+Example:
+-------------------------------
+let upstream = --
+in  upstream
+  with halogen.version = "master"
+  with halogen.repo = "https://example.com/path/to/git/repo.git"
+
+  with halogen-vdom.version = "v4.0.0"
+  with halogen-vdom.dependencies = [ "extra-dependency" ] # halogen-vdom.dependencies
+-------------------------------
+
+### Additions
+
+Purpose:
+- Add packages that aren't already included in the default package set
+
+Syntax:
+where `<version>` is:
+- a tag (i.e. "v4.0.0")
+- a branch (i.e. "master")
+- commit hash (i.e. "701f3e44aafb1a6459281714858fadf2c4c2a977")
+-------------------------------
+let upstream = --
+in  upstream
+  with new-package-name =
+    { dependencies =
+       [ "dependency1"
+       , "dependency2"
+       ]
+    , repo =
+       "https://example.com/path/to/git/repo.git"
+    , version =
+        "<version>"
+    }
+-------------------------------
+
+Example:
+-------------------------------
+let upstream = --
+in  upstream
+  with benchotron =
+      { dependencies =
+          [ "arrays"
+          , "exists"
+          , "profunctor"
+          , "strings"
+          , "quickcheck"
+          , "lcg"
+          , "transformers"
+          , "foldable-traversable"
+          , "exceptions"
+          , "node-fs"
+          , "node-buffer"
+          , "node-readline"
+          , "datetime"
+          , "now"
+          ]
+      , repo =
+          "https://github.com/hdgarrood/purescript-benchotron.git"
+      , version =
+          "v7.0.0"
+      }
+-------------------------------
+-}
+let upstream =
+      https://github.com/purescript/package-sets/releases/download/psc-0.14.2-20210713/packages.dhall sha256:654c3148cb995f642c73b4508d987d9896e2ad3ea1d325a1e826c034c0d3cd7b
+
+in  upstream

purescript/compose/spago.dhall

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+{-
+Welcome to a Spago project!
+You can edit this file as you like.
+
+Need help? See the following resources:
+- Spago documentation: https://github.com/purescript/spago
+- Dhall language tour: https://docs.dhall-lang.org/tutorials/Language-Tour.html
+
+When creating a new Spago project, you can use
+`spago init --no-comments` or `spago init -C`
+to generate this file without the comments in this block.
+-}
+{ name = "my-project"
+, dependencies = [ "console", "effect", "exists", "prelude", "psci-support" ]
+, packages = ./packages.dhall
+, sources = [ "src/**/*.purs", "test/**/*.purs" ]
+}

purescript/compose/src/Compose.purs

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+module Compose where
+
+import Prelude hiding (bind, discard)
+
+
+bind :: forall a b c. (a -> b) -> (b -> c) -> (a -> c)
+bind = (>>>)
+
+discard :: forall a b c. (a -> b) -> (Unit -> b -> c) -> (a -> c)
+discard f g = f >>> g unit

purescript/compose/src/Main.purs

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+module Main where
+
+import Prelude
+
+import Compose as Compose
+import Data.Exists (Exists)
+import Effect (Effect)
+import Effect.Class.Console (logShow)
+import Unsafe.Coerce (unsafeCoerce)
+
+
+c :: Int -> Int
+c = Compose.do
+    add2
+    double
+
+add2 :: Int -> Int
+add2 = (+) 2
+
+double :: Int -> Int
+double = (*) 2
+
+newtype I a = I a
+type EI = Exists I
+
+type Showable f = forall result. (forall r. Show r => f r -> result) -> result
+
+mkShowable :: forall a f. Show a => f a -> Showable f
+mkShowable a f = f a
+
+test :: String
+test = do
+  I something <- mkShowable $ I 0
+  show something
+  where
+  bind :: forall f result. Showable f -> (forall r. Show r => f r -> result) -> result 
+  bind e f = e f
+
+  magicShow :: forall r. r -> String
+  magicShow = unsafeCoerce
+
+main :: Effect Unit
+main = do
+  logShow $ c 3

purescript/compose/test/Main.purs

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+module Test.Main where
+
+import Prelude
+
+import Effect (Effect)
+import Effect.Class.Console (log)
+
+main :: Effect Unit
+main = do
+  log "🍝"
+  log "You should add some tests."