Initial version of work function

functions/WorkItem.linq

@@ -0,0 +1,83 @@
+<Query Kind="Program">
+  <NuGetReference>Microsoft.ApplicationInsights</NuGetReference>
+  <NuGetReference>Microsoft.AspNetCore.Mvc</NuGetReference>
+  <NuGetReference>Microsoft.Extensions.Logging.Console</NuGetReference>
+  <NuGetReference>Microsoft.Extensions.Logging.Debug</NuGetReference>
+  <NuGetReference>xunit.assert</NuGetReference>
+  <Namespace>Microsoft.ApplicationInsights</Namespace>
+  <Namespace>Microsoft.AspNetCore.Http</Namespace>
+  <Namespace>Microsoft.AspNetCore.Http.Internal</Namespace>
+  <Namespace>Microsoft.AspNetCore.Mvc</Namespace>
+  <Namespace>Microsoft.Extensions.DependencyInjection</Namespace>
+  <Namespace>Microsoft.Extensions.Logging</Namespace>
+  <Namespace>Microsoft.Extensions.Logging.Console</Namespace>
+  <Namespace>Microsoft.Extensions.Logging.Debug</Namespace>
+  <Namespace>Microsoft.Extensions.Primitives</Namespace>
+  <Namespace>Newtonsoft.Json</Namespace>
+  <Namespace>System.Net</Namespace>
+  <Namespace>System.Threading.Tasks</Namespace>
+  <Namespace>Xunit</Namespace>
+  <Namespace>Microsoft.ApplicationInsights.Extensibility</Namespace>
+  <Namespace>Microsoft.ApplicationInsights.Channel</Namespace>
+  <DisableMyExtensions>true</DisableMyExtensions>
+</Query>
+
+void Main()
+{
+    // If no parameters provided, go to docs
+    Assert.IsType<RedirectResult>(Run());
+    Assert.Equal("https://github.com/kzu/azdo#work-items", Run<RedirectResult>().Url);
+    // If project/id missing, go to docs
+    Assert.IsType<RedirectResult>(Run("foo"));
+    Assert.Equal("https://github.com/kzu/azdo#work-items", Run<RedirectResult>("foo").Url);
+
+    // If org/project provided but no id, go to docs
+    Assert.IsType<RedirectResult>(Run("foo", "oss"));
+    Assert.Equal("https://github.com/kzu/azdo#work-items", Run<RedirectResult>("foo", "oss").Url);
+
+    Assert.IsType<RedirectResult>(Run("kzu", "oss", 1));
+    Assert.IsType<RedirectResult>(Run("kzu", "1"));
+
+    // DevDiv defaults
+    Assert.StartsWith("https://dev.azure.com/DevDiv/DevDiv/_workitems/edit/", Run<RedirectResult>("DevDiv", "10000").Url);
+    Assert.StartsWith("https://dev.azure.com/DevDiv/DevDiv/_workitems/edit/", Run<RedirectResult>("10000").Url);
+}
+
+static TActionResult Run<TActionResult>(string org = null, string project = null, double? id = null)
+    => (TActionResult)Run(org, project, id);
+
+static IActionResult Run(string org = null, string project = null, double? id = null)
+    => Run(
+        new DefaultHttpRequest(new DefaultHttpContext()), 
+        new ServiceCollection().AddLogging(builder => builder.AddConsole()).BuildServiceProvider().GetService<ILoggerFactory>().CreateLogger("Console"), 
+        org, project, id);
+
+public static IActionResult Run(HttpRequest req, ILogger log, string org = null, string project = null, double? id = null)
+{
+    var parsed = id.HasValue ? id.Value : 0d;
+
+    // If the id is omitted, we try to parse it from the org (for DevDiv's super-short 
+    // format) or from the project, and default the project to == org further down (or both to DevDiv)
+    if (id == null && !(double.TryParse(org, out parsed) || double.TryParse(project, out parsed)))
+    {
+        return new RedirectResult("https://github.com/kzu/azdo#work-items");
+    }
+
+    // If we didn't get an id parameter, probe for defaults for the org/project
+    if (id == null)
+    {
+        // If didn't a project either, we must have parsed the id from the org above, 
+        // meaning it's a DevDiv super-short URL
+        if (project == null)
+        {
+            org = project = "DevDiv";
+        }
+        else
+        {
+            // Otherwise, we must have parsed it from the project so default project to org as a shorthand too.
+            project = org;
+        }
+    }
+
+    return new RedirectResult($"https://dev.azure.com/{org}/{project}/_workitems/edit/{parsed}");
+}