json-to-dhall initial implementation

dhall-json/dhall-json.cabal

@@ -73,6 +73,29 @@ Executable dhall-to-yaml
         text
     GHC-Options: -Wall
 
+Executable json-to-dhall
+    Hs-Source-Dirs: json-to-dhall
+    Main-Is: Main.hs
+    Build-Depends:
+        base                                       ,
+        aeson                                      ,
+        aeson-pretty                        < 0.9  ,
+        bytestring                          < 0.11 ,
+        dhall                                      ,
+        optparse-applicative                       ,
+        text                                < 1.3  ,
+        scientific           >= 0.3.0.0  && < 0.4  ,
+        exceptions           >= 0.8.3    && < 0.11 ,
+        containers                                 ,
+        unordered-containers >= 0.1.3.0  && < 0.3
+    if !impl(ghc >= 8.0) && !impl(eta >= 0.8.4)
+      Build-Depends: semigroups == 0.18.*
+    Other-Modules:
+        Paths_dhall_json
+    GHC-Options: -Wall
+    if impl(ghc < 8.0)
+      Buildable: False
+
 Test-Suite tasty
     Type: exitcode-stdio-1.0
     Hs-Source-Dirs: tasty

dhall-json/examples/bower.dhall

@@ -0,0 +1,13 @@
+-- Using this file:
+-- json-to-dhall ./bower.dhall < ./bower.json | dhall
+-- Round-trip test:
+-- json-to-dhall ./bower.dhall < ./bower.json | dhall | dhall-to-json
+
+{ name            : Text
+, description     : Text
+, license         : Text
+, keywords        : List Text
+, repository      : { type : Text, url : Text}
+, dependencies    : List { mapKey: Text, mapValue: Text }
+, devDependencies : List { mapKey: Text, mapValue: Text }
+}

dhall-json/examples/bower.json

@@ -0,0 +1,20 @@
+{
+  "name": "purescript-package",
+  "description": "A simple PS package",
+  "keywords": [
+    "purescript"
+  ],
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/purescript/purescript-package.git"
+  },
+  "dependencies": {
+    "purescript-prelude": "^4.0.0",
+    "purescript-effect": "^2.0.0"
+  },
+  "devDependencies": {
+    "purescript-math": "^2.1.1",
+    "purescript-integers": "^4.0.0"
+  }
+}