Add pangram exercise (closes #24)

config.json

@@ -7,6 +7,7 @@
   "problems": [
      "hello-world",
      "leap",
+     "pangram",
      "bob"
   ],
   "deprecated": [

elm-package.json

@@ -7,6 +7,7 @@
         ".",
         "./exercises/hello_world",
         "./exercises/leap",
+        "./exercises/pangram",
         "./exercises/bob"
     ],
     "exposed-modules": [],

exercises/pangram/Pangram.elm

@@ -0,0 +1 @@
+module Pangram where

exercises/pangram/Pangram.example

@@ -0,0 +1,17 @@
+module Pangram (..) where
+
+import String exposing (toLower, contains, fromChar)
+
+
+isPangram : String -> Bool
+isPangram sentence =
+  let
+    normalized =
+      toLower sentence
+  in
+    String.all (\c -> contains (fromChar c) normalized) alphabet
+
+
+alphabet : String
+alphabet =
+  "abcdefghijklmnopqrstuvwxyz"

exercises/pangram/PangramTests.elm

@@ -0,0 +1,48 @@
+module Main (..) where
+
+import Task
+import Console
+import ElmTest exposing (..)
+import Pangram exposing (isPangram)
+
+
+tests : Test
+tests =
+  suite
+    "Pangram"
+    [ test
+        "sentence empty"
+        (assertEqual
+          False
+          (isPangram "")
+        )
+    , test
+        "pangram with only lower case"
+        (assertEqual
+          True
+          (isPangram "the quick brown fox jumps over the lazy dog")
+        )
+    , test
+        "missing character 'x'"
+        (assertEqual
+          False
+          (isPangram "a quick movement of the enemy will jeopardize five gunboats")
+        )
+    , test
+        "pangram with mixed case and punctuation"
+        (assertEqual
+          True
+          (isPangram "\"Five quacking Zephyrs jolt my wax bed.\"")
+        )
+    , test
+        "pangram with non ascii characters"
+        (assertEqual
+          True
+          (isPangram "Victor jagt zwölf Boxkämpfer quer über den großen Sylter Deich.")
+        )
+    ]
+
+
+port runner : Signal (Task.Task x ())
+port runner =
+  Console.run (consoleRunner tests)

exercises/pangram/elm-package.json

@@ -0,0 +1,16 @@
+{
+    "version": "1.0.0",
+    "summary": "Exercism problems in Elm.",
+    "repository": "https://github.com/exercism/xelm.git",
+    "license": "BSD3",
+    "source-directories": [
+        "."
+    ],
+    "exposed-modules": [],
+    "dependencies": {
+        "deadfoxygrandpa/elm-test": "3.0.1 <= v < 4.0.0",
+        "elm-lang/core": "2.0.0 <= v < 4.0.0",
+        "laszlopandy/elm-console": "1.1.0 <= v < 2.0.0"
+    },
+    "elm-version": "0.15.0 <= v < 0.17.0"
+}