Add support for opening from topmost browser

If there is no URL in the paste buffer, use the GitHub context from the
topmost browser.

Author: jcansdale

src/GitHub.App/Services/GitHubContextService.cs

@@ -2,12 +2,14 @@
 using System.Text;
 using System.Linq;
 using System.Collections.Generic;
+using System.ComponentModel.Composition;
 using System.Text.RegularExpressions;
 using System.Runtime.InteropServices;
 using GitHub.Primitives;
 
 namespace GitHub.App.Services
 {
+    [Export(typeof(GitHubContextService))]
     public class GitHubContextService
     {
         // USERID_REGEX = /[a-z0-9][a-z0-9\-\_]*/i
@@ -37,7 +39,7 @@ public GitHubContext FindContextFromUrl(UriString url)
             {
                 Host = url.Host,
                 Owner = url.Owner,
-                RepositoryName = url.RepositoryName
+                RepositoryName = url.RepositoryName,
             };
         }
 

src/GitHub.VisualStudio/Commands/OpenFromUrlCommand.cs

@@ -6,6 +6,7 @@
 using GitHub.Commands;
 using GitHub.Services;
 using GitHub.Primitives;
+using GitHub.App.Services;
 using GitHub.Services.Vssdk.Commands;
 using EnvDTE;
 using Microsoft.VisualStudio;
@@ -15,6 +16,7 @@ namespace GitHub.VisualStudio.Commands
     [Export(typeof(IOpenFromUrlCommand))]
     public class OpenFromUrlCommand : VsCommand<string>, IOpenFromUrlCommand
     {
+        readonly Lazy<GitHubContextService> gitHubContextService;
         readonly Lazy<IRepositoryCloneService> repositoryCloneService;
         readonly Lazy<IPullRequestEditorService> pullRequestEditorService;
         readonly Lazy<IGitHubToolWindowManager> gitHubToolWindowManager;
@@ -32,11 +34,13 @@ public class OpenFromUrlCommand : VsCommand<string>, IOpenFromUrlCommand
 
         [ImportingConstructor]
         public OpenFromUrlCommand(
+            Lazy<GitHubContextService> gitHubContextService,
             Lazy<IRepositoryCloneService> repositoryCloneService,
             Lazy<IPullRequestEditorService> pullRequestEditorService,
             [Import(typeof(Microsoft.VisualStudio.Shell.SVsServiceProvider))] IServiceProvider sp) :
             base(CommandSet, CommandId)
         {
+            this.gitHubContextService = gitHubContextService;
             this.repositoryCloneService = repositoryCloneService;
             this.pullRequestEditorService = pullRequestEditorService;
             dte = new Lazy<DTE>(() => (DTE)sp.GetService(typeof(DTE)));
@@ -56,6 +60,21 @@ public override async Task Execute(string url)
 
             var gitHubUrl = new UriString(url);
             if (!gitHubUrl.IsValidUri || !gitHubUrl.IsHypertextTransferProtocol)
+            {
+                gitHubUrl = null;
+            }
+
+            if (gitHubUrl == null)
+            {
+                // HACK: Reconstruct a GitHub URL from the topmost browser window
+                var context = gitHubContextService.Value.FindContextFromBrowser();
+                if (context != null)
+                {
+                    gitHubUrl = $"https://github.com/{context.Owner}/{context.RepositoryName}";
+                }
+            }
+
+            if (gitHubUrl == null)
             {
                 return;
             }