feat(git-provider): Implement RemoveGitRepoCommand

src/ModuleCore/Git/GitManager.cs

@@ -117,6 +117,54 @@ public class GitManager
 		});
 	}
 
+	public void UnregisterRepo(string registrationName)
+	{
+		_db.InConnection(conn =>
+		{
+			var existingRegistration = conn.Query<InternalGitRegistration>(
+					$"""
+					 SELECT {nameof(InternalGitRegistration.Id)}
+					       ,{nameof(InternalGitRegistration.Name)}
+					       ,{nameof(InternalGitRegistration.Location)}
+					 FROM {InternalGitRegistration.TableName}
+					 WHERE {nameof(InternalGitRegistration.Name)} = ?
+					 """,
+					registrationName)
+				.FirstOrDefault();
+
+			if (existingRegistration is null)
+			{
+				throw new Exception($"No registration exists for '{registrationName}'.")
+				{
+					Source = "unregister-repository",
+				};
+			}
+
+			var deleted = conn.Delete<InternalGitRegistration>(existingRegistration.Id);
+
+			// If we somehow found a registration but delete returned nothing, just return and assume we've already
+			// removed it from registrations.
+			// Seems a bit risky when you read it logically, but by this point the registration shouldn't exist so it doesn't
+			// matter.
+			if (deleted == 0)
+			{
+				return;
+			}
+
+			// Remove by the name we get from the database instead of what was passed in
+			if (_registrations.TryRemove(registrationName, out var removedItem))
+			{
+				_debugWriterDelegate?.Invoke($"Removed {registrationName}.");
+			}
+
+			// Weird error to throw, but by this stage we shouldn't have a git repo registered under this name
+			throw new Exception("Failed to remove registration - no registration exists.")
+			{
+				Source = "unregister-repository",
+			};
+		});
+	}
+
 	public List<GitRegistration> ListRepos()
 	{
 		return _registrations.Select(x =>

src/PowershellModule/Git/Commands/RemoveGitRepoCommand.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Management.Automation;
+using ModuleCore.Git;
+
+namespace PowershellModule.Git.Commands;
+
+[Cmdlet(VerbsCommon.Remove, GitCommands.GitRepoNoun)]
+public class RemoveGitRepoCommand : PSCmdlet
+{
+	[Parameter(
+		Position = 0,
+		ValueFromPipeline = true,
+		HelpMessage = "Reference name for the repo")]
+	public string? Name { get; set; }
+
+	protected override void BeginProcessing()
+	{
+		try
+		{
+			GitManager.SetDebugWriter(WriteDebug);
+
+			var repoFolder = GitManager.IsGitRepo(SessionState.Path.CurrentLocation.Path);
+
+			// Removing a registration works similar to registering a new one - we either remove by exact name, or by
+			// the folder if no name is given (so a user can remove a registration from a git repo they're currently in)
+			GitManager.Instance.UnregisterRepo(Name ?? repoFolder.Folder);
+			GitManager.ClearDebugWriter();
+
+			base.BeginProcessing();
+		}
+		catch (Exception ex)
+		{
+			WriteError(new ErrorRecord(ex, ex.Source, ErrorCategory.FromStdErr, null));
+		}
+	}
+}