Add SpaceAutomation support

Author: matkoch

src/NerdBank.GitVersioning/CloudBuild.cs

@@ -21,6 +21,7 @@ public static class CloudBuild
             new Jenkins(),
             new GitLab(),
             new Travis(),
+            new SpaceAutomation(),
         };
 
         /// <summary>

src/NerdBank.GitVersioning/CloudBuildServices/SpaceAutomation.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Nerdbank.GitVersioning.CloudBuildServices
+{
+    /// <summary>
+    /// SpaceAutomation CI build support.
+    /// </summary>
+    /// <remarks>
+    /// The SpaceAutomation-specific properties referenced here are documented here:
+    /// https://www.jetbrains.com/help/space/automation-environment-variables.html
+    /// </remarks>
+    internal class SpaceAutomation : ICloudBuild
+    {
+        public string BuildingBranch => CloudBuild.IfStartsWith(BuildingRef, "refs/heads/");
+
+        public string BuildingTag => CloudBuild.IfStartsWith(BuildingRef, "refs/tags/");
+
+        public string GitCommitId => Environment.GetEnvironmentVariable("JB_SPACE_GIT_REVISION");
+
+        public bool IsApplicable => this.GitCommitId != null;
+
+        public bool IsPullRequest => false;
+
+        private static string BuildingRef => Environment.GetEnvironmentVariable("JB_SPACE_GIT_BRANCH");
+
+        public IReadOnlyDictionary<string, string>  SetCloudBuildNumber(string buildNumber, TextWriter stdout, TextWriter stderr)
+        {
+            return new Dictionary<string, string>();
+        }
+
+        public IReadOnlyDictionary<string, string> SetCloudBuildVariable(string name, string value, TextWriter stdout, TextWriter stderr)
+        {
+            return new Dictionary<string, string>();
+        }
+    }
+}