(GH-121) Add support for reading npm configuration

src/Cake.Npm/Get/NpmGetSettings.cs

@@ -0,0 +1,24 @@
+using Cake.Core;
+using Cake.Core.IO;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Cake.Npm.Get
+{
+    class NpmGetSettings : NpmSettings
+    {
+        public NpmGetSettings() : base("get")
+        {
+            RedirectStandardOutput = true;
+        }
+        public string Key { get; set; }
+
+        protected override void EvaluateCore(ProcessArgumentBuilder args)
+        {
+            base.EvaluateCore(args);
+            args.Append(Key);
+        }
+    }
+}

src/Cake.Npm/Get/NpmGetTools.cs

@@ -0,0 +1,39 @@
+using Cake.Core;
+using Cake.Core.Diagnostics;
+using Cake.Core.IO;
+using Cake.Core.Tooling;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Cake.Npm.Get
+{
+    class NpmGetTools : NpmTool<NpmSettings>
+    {
+        public NpmGetTools(
+            IFileSystem fileSystem,
+            ICakeEnvironment environment,
+            IProcessRunner processRunner,
+            IToolLocator tools,
+            ICakeLog log)
+            : base(fileSystem, environment, processRunner, tools, log)
+        {
+        }
+
+
+        public string Get(NpmGetSettings settings)
+        {
+            if (string.IsNullOrWhiteSpace(settings.Key))
+            {
+                throw new ArgumentException();
+            }
+            IEnumerable<string> output = new List<string>();
+            RunCore(settings, new ProcessSettings(), process =>
+            {
+                output = process.GetStandardOutput();
+            });
+            return output.SingleOrDefault();
+        }
+    }
+}

src/Cake.Npm/NpmGetAliases.cs

@@ -0,0 +1,40 @@
+using Cake.Core;
+using Cake.Core.Annotations;
+using Cake.Npm.Get;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Cake.Npm
+{
+    /// <summary>
+    /// Npm get aliases
+    /// </summary>
+    [CakeAliasCategory("Npm")]
+    [CakeNamespaceImport("Cake.Npm")]
+    public static class NpmGetAliases
+    {
+        /// <summary>
+        /// Gets the npm config on the given key
+        /// </summary>
+        /// <param name="context">The cake context.</param>
+        /// <param name="key">The config key.</param>
+        /// <param name="workingDirectory">The working directory</param>
+        /// <returns>The value on the given key.</returns>
+        [CakeMethodAlias]
+        [CakeAliasCategory("Get")]
+        public static string NpmGet(this ICakeContext context, string key, string workingDirectory = null)
+        {
+            if (key == null)
+            {
+                throw new ArgumentNullException("key can't be null");
+            }
+            NpmGetSettings settings = new NpmGetSettings()
+            {
+                Key = key,
+                WorkingDirectory = workingDirectory
+            };
+            return new NpmGetTools(context.FileSystem, context.Environment, context.ProcessRunner, context.Tools, context.Log).Get(settings);
+        }
+    }
+}