(GH-120) Add support for npm view

src/Cake.Npm/NpmViewAliases.cs

@@ -0,0 +1,36 @@
+using Cake.Core;
+using Cake.Core.Annotations;
+using Cake.Npm.View;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Cake.Npm
+{
+    /// <summary>
+    /// Npm view aliases
+    /// </summary>
+    [CakeAliasCategory("Npm")]
+    [CakeNamespaceImport("Cake.Npm")]
+    public static class NpmViewAliases
+    {
+        /// <summary>
+        /// Call npm view with --json attribute.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <param name="packageName">Name of the package</param>
+        /// <param name="workingDirectory"></param>
+        /// <returns>An empty string if the package was not found on the repository</returns>
+        [CakeMethodAlias]
+        [CakeAliasCategory("View")]
+        public static string NpmView(this ICakeContext context, string packageName = null, string workingDirectory = null)
+        {
+            NpmViewSettings settings = new NpmViewSettings()
+            {
+                PackageName = packageName,
+                WorkingDirectory = workingDirectory
+            };
+            return new NpmViewTool(context.FileSystem, context.Environment, context.ProcessRunner, context.Tools, context.Log).View(settings);
+        }
+    }
+}

src/Cake.Npm/View/NpmViewSettings.cs

@@ -0,0 +1,35 @@
+namespace Cake.Npm.View
+{
+    using System.Linq;
+    using Cake.Core;
+    using Cake.Core.IO;
+
+    /// <summary>
+    /// Contains settings used by <see cref="NpmViewTool"/>.
+    /// </summary>
+    public class NpmViewSettings : NpmSettings
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NpmViewSettings"/> class.
+        /// </summary>
+        public NpmViewSettings() 
+            : base("view")
+        {
+            RedirectStandardOutput = true;
+        }
+
+        /// <summary>
+        /// Gets or sets the name of the package for which the registry entry should be shown.
+        /// </summary>
+        public string PackageName { get; set; }
+
+        /// <inheritdoc />
+        protected override void EvaluateCore(ProcessArgumentBuilder args)
+        {
+            base.EvaluateCore(args);
+
+            args.Append("--json");
+            args.Append(PackageName);
+        }
+    }
+}

src/Cake.Npm/View/NpmViewTool.cs

@@ -0,0 +1,58 @@
+namespace Cake.Npm.View
+{
+    using Cake.Core;
+    using Cake.Core.Diagnostics;
+    using Cake.Core.IO;
+    using Cake.Core.Tooling;
+    using System.Collections.Generic;
+
+    /// <summary>
+    /// Tool for viewing registry info.
+    /// </summary>
+    public class NpmViewTool : NpmTool<NpmSettings>
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NpmViewTool"/> class.
+        /// </summary>
+        /// <param name="fileSystem">The file system.</param>
+        /// <param name="environment">The environment.</param>
+        /// <param name="processRunner">The process runner.</param>
+        /// <param name="tools">The tool locator.</param>
+        /// <param name="log">Cake log instance.</param>
+        public NpmViewTool(
+            IFileSystem fileSystem,
+            ICakeEnvironment environment,
+            IProcessRunner processRunner,
+            IToolLocator tools,
+            ICakeLog log)
+            : base(fileSystem, environment, processRunner, tools, log)
+        {
+        }
+
+        /// <summary>
+        /// Returns information about a package registry entry.
+        /// </summary>
+        /// <param name="settings">The settings.</param>
+        public string View(NpmViewSettings settings)
+        {
+            try
+            {
+                IEnumerable<string> output = new List<string>();
+                RunCore(
+                    settings,
+                    new ProcessSettings(),
+                    process =>
+                    {
+                        output = process.GetStandardOutput();
+                    });
+                return string.Join("\n", output);
+
+            }
+            catch (CakeException)
+            {
+                CakeLog.Information("Error should be a 404 and i ignore it.");
+                return "";
+            }
+        }
+    }
+}