Merge pull request #81 from nodes-vapor/feature/more-env-features

Add more convenience for getting env variables

Sources/Sugar/Helpers/Environment.swift

@@ -1,11 +1,34 @@
 import Vapor
 
 public extension Environment {
+    enum EnvironmentError: Error {
+        case keyNotFound(key: String)
+    }
+
     public static func get(_ key: String, _ fallback: String) -> String {
         return ProcessInfo.processInfo.environment[key] ?? fallback
     }
+
+    public static func get(_ key: String) -> String? {
+        return ProcessInfo.processInfo.environment[key]
+    }
+
+    public static func assertGet(_ key: String) throws -> String {
+        guard let value = Environment.get(key) else {
+            throw Environment.EnvironmentError.keyNotFound(key: key)
+        }
+        return value
+    }
 }
 
 public func env(_ key: String, _ fallback: String) -> String {
     return Environment.get(key, fallback)
 }
+
+public func env(_ key: String) -> String? {
+    return Environment.get(key)
+}
+
+public func assertEnv(_ key: String) throws -> String {
+    return try Environment.assertGet(key)
+}