Add Bitbucket Cloud provider (#789)

src/Cake.GitVersioning/GitVersioningCloudProvider.cs

@@ -52,5 +52,10 @@ public enum GitVersioningCloudProvider
         /// Use the Jetbrains Space cloud build provider.
         /// </summary>
         SpaceAutomation,
+
+        /// <summary>
+        /// Use the Bitbucket cloud build provider.
+        /// </summary>
+        BitbucketCloud,
     }
 }

src/NerdBank.GitVersioning/CloudBuild.cs

@@ -24,6 +24,7 @@ public static class CloudBuild
         new GitLab(),
         new Travis(),
         new SpaceAutomation(),
+        new BitbucketCloud(),
     };
 
     /// <summary>

src/NerdBank.GitVersioning/CloudBuildServices/BitbucketCloud.cs

@@ -0,0 +1,42 @@
+// Copyright (c) .NET Foundation and Contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace Nerdbank.GitVersioning.CloudBuildServices;
+
+/// <summary>
+/// Cloud build handling for Bitbucket Cloud.
+/// </summary>
+/// <remarks>
+/// The Bitbucket-specific properties referenced here are <see href="https://support.atlassian.com/bitbucket-cloud/docs/variables-and-secrets/">documented here</see>.
+/// </remarks>
+public class BitbucketCloud : ICloudBuild
+{
+    /// <inheritdoc />
+    public bool IsApplicable => !string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable("BITBUCKET_PIPELINE_UUID")) &&
+                                !string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable("BITBUCKET_STEP_UUID")) &&
+                                !string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable("BITBUCKET_STEP_TRIGGERER_UUID"));
+
+    /// <inheritdoc />
+    public bool IsPullRequest => !string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable("BITBUCKET_PR_ID"));
+
+    /// <inheritdoc />
+    public string BuildingBranch => Environment.GetEnvironmentVariable("BITBUCKET_BRANCH");
+
+    /// <inheritdoc />
+    public string BuildingTag => Environment.GetEnvironmentVariable("BITBUCKET_TAG");
+
+    /// <inheritdoc />
+    public string GitCommitId => Environment.GetEnvironmentVariable("BITBUCKET_COMMIT");
+
+    /// <inheritdoc />
+    public IReadOnlyDictionary<string, string> SetCloudBuildNumber(string buildNumber, TextWriter stdout, TextWriter stderr)
+    {
+        return new Dictionary<string, string>();
+    }
+
+    /// <inheritdoc />
+    public IReadOnlyDictionary<string, string> SetCloudBuildVariable(string name, string value, TextWriter stdout, TextWriter stderr)
+    {
+        return new Dictionary<string, string>();
+    }
+}