feat(git-provider): Initial git registration storage in database

- update PostBuild.ps1 to not delete data directory created during debug
- move sqlite-net-pcl to ModuleCore

src/ModuleCore/Database/DatabaseManager.cs

@@ -0,0 +1,64 @@
+using SQLite;
+
+namespace ModuleCore.Database;
+
+public class DatabaseManager
+{
+	private readonly FileInfo _databaseLocation;
+
+	/// <summary>
+	/// Creates a new manager for the given database file by name
+	/// </summary>
+	/// <param name="databaseName">
+	/// Filename for the database with no extension. Slashes are accepted and will create directories as needed.
+	/// </param>
+	public DatabaseManager(string databaseName)
+	{
+		// Even though the xmldoc says "with no extension", we strip off any extension regardless
+		_databaseLocation = new FileInfo(Path.Combine(".", "data", $"{SanitiseFilename(databaseName)}.db"));
+
+		Directory.CreateDirectory(_databaseLocation.DirectoryName!);
+
+		if (!File.Exists(_databaseLocation.FullName))
+		{
+			var file = File.Create(_databaseLocation.FullName);
+			file.Close();
+		}
+	}
+
+	public void InConnection(Action<SQLiteConnection> dbAction)
+	{
+		using var conn = new SQLiteConnection(_databaseLocation.FullName);
+		dbAction(conn);
+	}
+
+	public T InConnection<T>(Func<SQLiteConnection, T> dbAction)
+	{
+		using var conn = new SQLiteConnection(_databaseLocation.FullName);
+		return dbAction(conn);
+	}
+
+	/// <summary>
+	/// Returns a bool for the given query. Convenience method for <see cref="SQLiteConnection.ExecuteScalar"/>.
+	/// </summary>
+	/// <param name="query">A query starting with SELECT 1, optionally paramaterised with ?</param>
+	/// <param name="args">Parameter values</param>
+	/// <returns></returns>
+	public bool Exists(string query, params object[] args)
+	{
+		using var conn = new SQLiteConnection(_databaseLocation.FullName);
+		var exists = conn.ExecuteScalar<bool?>(query, args);
+		return exists ?? false;
+	}
+
+	/// <summary>
+	/// Removes double dots from the filename and removes the file extension
+	/// </summary>
+	/// <param name="filename"></param>
+	/// <returns></returns>
+	private string SanitiseFilename(string filename)
+	{
+		// Honestly not really needed seeing as its just me and this isn't coming from user supplied code, but eh.
+		return Path.GetFileNameWithoutExtension(filename.Replace("..", string.Empty));
+	}
+}

src/ModuleCore/Git/GitManager.cs

@@ -1,9 +1,31 @@
-namespace ModuleCore.Git;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using ModuleCore.Database;
+using ModuleCore.Git.Models;
+using SQLite;
+
+namespace ModuleCore.Git;
 
 // TODO: better name for this
 public class GitManager
 {
 	private static readonly Lazy<GitManager> GitManagerInstance = new(() => new GitManager());
+	private readonly ConcurrentDictionary<string, InternalGitRegistration> _registrations;
+	private readonly DatabaseManager _db;
+
+	private GitManager()
+	{
+		Debug.WriteLine($"{nameof(GitManager)} init");
+
+		_registrations = new ConcurrentDictionary<string, InternalGitRegistration>();
+		_db = new DatabaseManager("git.db");
+
+		_db.InConnection(conn =>
+		{
+			conn.CreateTable<InternalGitRegistration>();
+		});
+	}
+
 	public static GitManager Instance => GitManagerInstance.Value;
 
 	/// <summary>
@@ -12,26 +34,7 @@ public class GitManager
 	internal static GitManager InternalFreshInstance => new();
 
 	/// <summary>
-	/// Simply <see cref="Path.DirectorySeparatorChar"/>.ToString()
-	/// </summary>
-	private static readonly string DirectorySeparator = Path.DirectorySeparatorChar.ToString();
-
-	private readonly InternalDirectory _repositories;
-	private readonly Lock _readWriteLock = new();
-
-	private GitManager()
-	{
-		Console.WriteLine($"{nameof(GitManager)} init");
-		// Initialise the root container
-		_repositories = new InternalDirectory()
-		{
-			Name = DirectorySeparator,
-			InternalPath = DirectorySeparator
-		};
-	}
-
-	/// <summary>
-	/// Registers a git repository based on an absolute location. If <paramref name="registrationName"/> is null or empty,
+	/// Registers a git repository based on an absolute location. If <paramref name="registrationName" /> is null or empty,
 	/// the registration will use the folder name for the git repo at the top level.
 	/// </summary>
 	/// <param name="absoluteRepositoryLocation"></param>
@@ -39,124 +42,149 @@ public class GitManager
 	/// <returns>The normalised string the repository was registered against</returns>
 	public string RegisterRepo(string absoluteRepositoryLocation, string registrationName)
 	{
-		// Depending on the caller, it might be possible that they've scripted automatic repo registration. Because I
-		// don't really want to account to all the subtle ways that can be parallised, I just naively lock on every
-		// registration attempt. This method should be quick regardless, and I could use ConcurrentDictionary except
-		// that means every instance of InternalDirectory would need it and yeah nah fuck that I can just lock at the
-		// top level
-		lock (_readWriteLock)
-		{
-			var normalisedName = NormaliseNamePath(string.IsNullOrWhiteSpace(registrationName)
+		registrationName = string.IsNullOrWhiteSpace(registrationName)
 			? new DirectoryInfo(absoluteRepositoryLocation).Name
-				: registrationName);
+			: registrationName;
 
-			// Regardless of if we get a name or not, the fully qualified version for us
-			// starts with a /
-			var directorySegmentsFromName = NameToSegments(normalisedName);
-
-			var added = _repositories.Add(absoluteRepositoryLocation, directorySegmentsFromName);
-
-			// Not sure about this, the Add should throw any exceptions on duplicate/failures but for now I'll leave this
-			// here
-			if (added == null)
+		var gitRegistration = new InternalGitRegistration
 		{
-				throw new Exception("Failed to register location");
+			Name = registrationName,
+			Location = absoluteRepositoryLocation,
+			Id = Guid.CreateVersion7(),
+		};
+
+		return _db.InConnection<string>(conn =>
+		{
+			// Query if we already have a registration either by name or location.
+			// tbh this is a bit of a janky way to do exists when I have to pass the query in anyway, but I just didn't
+			// want to do null checks and a truthy check so I wrap it in a barely-valuable method.
+			var registrationExists = _db.Exists(
+				$"""
+				 SELECT 1 
+				 FROM {InternalGitRegistration.TableName}
+				 WHERE Name = ? OR
+				       Location = ?
+				 """,
+				gitRegistration.Name,
+				gitRegistration.Location
+			);
+
+			if (registrationExists)
+			{
+				throw new Exception($"A Git repo is already registered with the name {registrationName} or location {absoluteRepositoryLocation}");
 			}
 
-			return normalisedName;
+			// Insert the new record
+			conn.Insert(gitRegistration);
+
+			if (_registrations.TryAdd(registrationName, gitRegistration))
+			{
+				return registrationName;
 			}
+
+			// This error case should be unlikely, but if a registration was removed but the registrations wasn't updated
+			// correctly then we'd unable to re-add a repo with the same name
+			throw new Exception("An error occured during registration.");
+		});
+	}
+
+	public List<GitRegistration> ListRepos()
+	{
+		return _registrations.Select(x =>
+				new GitRegistration
+				{
+					Name = x.Value.Name,
+					Location = x.Value.Location,
+					CurrentBranch = x.Value.CurrentBranch,
+				}
+			)
+			.ToList();
+	}
+
+	public string GetRepo(string? registeredName)
+	{
+		if (string.IsNullOrEmpty(registeredName))
+		{
+			throw new Exception("Name cannot be null");
+		}
+
+		if (_registrations.TryGetValue(registeredName, out var registration))
+		{
+			return registration.Location;
+		}
+
+		throw new Exception($"No git repo has been registered with the name {registeredName}");
 	}
 
 	/// <summary>
-	/// Takes a name and returns it as a queue of its parts, starting with a root of <see cref="DirectorySeparator"/>
+	/// Used for internal git registration and handles getting the current branch
 	/// </summary>
-	/// <param name="name"></param>
-	/// <returns></returns>
-	private Queue<string> NameToSegments(string name)
+	[Table(TableName)]
+	private class InternalGitRegistration
 	{
-		var segments = name.Split(DirectorySeparator);
+		private string _currentBranch = string.Empty;
+		private long _nextCheckTime;
+		internal const string TableName = "GitRegistration";
 
-		return segments.Length == 1
-			? new Queue<string>([DirectorySeparator, name])
-			: new Queue<string>([DirectorySeparator, ..segments]);
-	}
+		[PrimaryKey]
+		public Guid Id { get; set; }
 
-	/// <summary>
-	/// Normalises the path separators in the given string to use Path.DirectorySeparatorChar
-	/// </summary>
-	/// <param name="name"></param>
-	/// <returns></returns>
-	private string NormaliseNamePath(string name)
-	{
-		// Feels a bit hacky, but this will actually normalise a path to a valid form. So if the input is
-		// some/directory/paths, Path.GetRelativePath will normalise it to some\directory\paths, relative to ./
-		// which is kind of handy but I also just wish there was a Path method that would do this for me. I know that
-		// the whole point of Path is that it's based on a file system, but file systems can also be arbitrary and not
-		// always be drive rooted.
-		// Either way, this works and saves me having to reimplement a worse method when it's more important that users
-		// are able to use file paths in whatever form they prefer, which means we leverage the internal implementation
-		// in a weird way.
-		return Path.GetRelativePath("./", name);
-	}
-
-	private class InternalDirectory
-	{
-		/// <summary>
-		/// Name of the folder this 
-		/// </summary>
+		[Indexed(Unique = true)]
 		public string Name { get; set; } = null!;
 
-		public Dictionary<string, InternalDirectory> Children { get; set; } = [];
+		[Indexed(Unique = true)]
+		public string Location { get; set; } = null!;
 
-		internal string InternalPath { get; set; }
+		public string CurrentBranch => GetCurrentBranch();
 
-		/// <summary>
-		/// If not null, this is the absolute location of a registered git repository
-		/// </summary>
-		public string? FullRepositoryPath { get; set; }
-
-		/// <summary>
-		/// 
-		/// </summary>
-		/// <param name="absoluteRepositoryLocation"></param>
-		/// <param name="directorySegmentsFromName"></param>
-		/// <returns></returns>
-		/// <exception cref="Exception"></exception>
-		internal InternalDirectory? Add(string absoluteRepositoryLocation, Queue<string> directorySegmentsFromName)
+		// TODO: not fully decided on if I want this feature or not, but keeping it in for now
+		private string GetCurrentBranch()
 		{
-			var topStack = directorySegmentsFromName.Dequeue();
-
-			if (topStack != Name)
+			var now = DateTime.Now;
+			// git branch should be quick enough that even with a large number of registrations this shouldn't be that slow
+			// when doing Get-GitRepo, but regardless we still only get the current branch via git if it's been some amount
+			// of time since the last time we did.
+			if (now.Ticks < _nextCheckTime)
 			{
-				// logically it shouldn't be possible to have a value on top of the stack that _doesn't_ exist, but
-				// just incase we throw as this should only happen if an Add is attempted on the root and the queue was
-				// not correctly rooted to /
-				throw new Exception($"Directory segment does not seem to exist: {topStack}");
+				return _currentBranch;
 			}
 
-			// We're at the end of the directory segments so we can safely say we're at the end of the tree so
-			// we add it to the relevant dictionary
-			if (directorySegmentsFromName.Count == 0)
+			// use -C for the git command so we don't need to set the working directory and the git command can be run
+			// from anywhere against the appropriate location
+			var ps = new ProcessStartInfo("git",
+				["-C", Location, "branch", "--show-current"])
 			{
-				FullRepositoryPath = absoluteRepositoryLocation;
-				return this;
-			}
-
-			var nextSegment = directorySegmentsFromName.Peek();
-
-			// Attempt to get the next level of the directory. If we don't have a key entry, create one
-			if (!Children.TryGetValue(nextSegment, out var nextChild))
-			{
-				nextChild = new InternalDirectory()
-				{
-					Name = nextSegment,
-					InternalPath = Path.Combine(InternalPath, nextSegment)
+				RedirectStandardOutput = true,
+				RedirectStandardError = true,
 			};
-				Children.Add(nextSegment, nextChild);
+
+			// If the user doesn't have git on their path, this will throw an exception that I don't have to do anything
+			// special with, it'll be unhandled and powershell will handle it
+			var gitProcess = Process.Start(ps);
+
+			// This probably shouldn't be possible? Not really sure of the conditions where the process could be started
+			// but return null, but I'm going to consider that unrecoverable error territory
+			if (gitProcess is null)
+			{
+				throw new Exception("git failed to start");
 			}
 
-			// add the next
-			return nextChild.Add(absoluteRepositoryLocation, directorySegmentsFromName);
+			gitProcess.WaitForExit();
+
+			if (!gitProcess.StandardOutput.EndOfStream)
+			{
+				_currentBranch = gitProcess.StandardOutput.ReadToEnd();
+			}
+
+			if (!gitProcess.StandardError.EndOfStream)
+			{
+				_currentBranch = gitProcess.StandardError.ReadToEnd();
+			}
+
+			// Set the next check to be in the future so we don't hold up any list commands every time.
+			_nextCheckTime = now.AddMinutes(15).Ticks;
+
+			return _currentBranch;
 		}
 	}
 }

src/ModuleCore/Git/Models/GitRegistration.cs

@@ -0,0 +1,8 @@
+namespace ModuleCore.Git.Models;
+
+public class GitRegistration
+{
+	public required string Name { get; set; }
+	public required string Location { get; set; }
+	public required string CurrentBranch { get; set; }
+}

src/ModuleCore/ModuleCore.csproj

@@ -13,4 +13,8 @@
         </AssemblyAttribute>
     </ItemGroup>
 
+    <ItemGroup>
+      <PackageReference Include="sqlite-net-pcl" />
+    </ItemGroup>
+
 </Project>

src/PowershellModule/Git/Commands/GetGitRepoCommand.cs

@@ -0,0 +1,17 @@
+using System.Management.Automation;
+using ModuleCore.Git;
+
+namespace PowershellModule.Git.Commands;
+
+[Cmdlet(VerbsCommon.Get, GitCommands.GitRepoNoun)]
+public class ListGitRepoCommand : PSCmdlet
+{
+	protected override void BeginProcessing()
+	{
+		var repos = GitManager.Instance.ListRepos();
+
+		WriteObject(repos);
+
+		base.BeginProcessing();
+	}
+}

src/PowershellModule/Git/Commands/GitCommands.cs

@@ -0,0 +1,6 @@
+namespace PowershellModule.Git.Commands;
+
+public class GitCommands
+{
+	public const string GitRepoNoun = "GitRepo";
+}

src/PowershellModule/Git/Commands/NewGitRepoCommand.cs

@@ -4,13 +4,11 @@ using System.IO;
 using System.Management.Automation;
 using ModuleCore.Git;
 
-namespace PowershellModule.Git;
+namespace PowershellModule.Git.Commands;
 
-[Cmdlet(VerbsCommon.New, Noun)]
-public class NewGitRepoCommand : PSCmdlet
+[Cmdlet(VerbsCommon.New, GitCommands.GitRepoNoun)]
+public sealed class NewGitRepoCommand : PSCmdlet
 {
-	private const string Noun = "GitRepo";
-
 	[Parameter(
 		Position = 0,
 		ValueFromPipeline = true,
@@ -19,13 +17,12 @@ public class NewGitRepoCommand : PSCmdlet
 
 	public NewGitRepoCommand()
 	{
-		Console.WriteLine($"{nameof(NewGitRepoCommand)} init");
 	}
 
 	protected override void BeginProcessing()
 	{
 		var pwd = this.SessionState.Path.CurrentLocation.Path;
-		WriteObject("Checking if current directory is a git repository...");
+		WriteDebug("Checking if current directory is a git repository...");
 
 		var repoFolfder = IsGitRepo(pwd);
 
@@ -104,11 +101,11 @@ public class NewGitRepoCommand : PSCmdlet
 		/// <summary>
 		/// The full path to the top level folder containing a git repository
 		/// </summary>
-		public string Directory { get; set; } = null!;
+		public string Directory { get; init; } = null!;
 
 		/// <summary>
 		/// The last folder name of the directory
 		/// </summary>
-		public string Folder { get; set; } = null!;
+		public string Folder { get; init; } = null!;
 	}
 }

src/PowershellModule/Git/Commands/SetGitRepoCommand.cs

@@ -1,18 +1,14 @@
-using System;
-using System.Management.Automation;
+using System.Management.Automation;
 using ModuleCore.Git;
 
-namespace PowershellModule.Git;
+namespace PowershellModule.Git.Commands;
 
-[Cmdlet(VerbsCommon.Set, Noun)]
+// TODO: decide if I want to use this verb instead of show. Currently this implementation is under Show-GitRepo
+[Cmdlet(VerbsCommon.Set, GitCommands.GitRepoNoun)]
 public class SetGitRepoCommand : PSCmdlet
 {
-	private const string Noun = "GitRepo";
-
 	public SetGitRepoCommand()
 	{
-		Console.WriteLine($"{nameof(NewGitRepoCommand)} init");
-		var a = GitManager.Instance;
 	}
 
 	protected override void BeginProcessing()

src/PowershellModule/Git/Commands/ShowGitRepoCommand.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Management.Automation;
+using ModuleCore.Git;
+
+namespace PowershellModule.Git.Commands;
+
+// TODO: decide on if I like Show to be used as the verb name. Other options I have are push/pop and open.
+//  Seeing as this is likely just for me currently, Show-GitRepo suits my workflow more where I'll want to quickly just
+//  pushd into a git repo, do whatever I want to do with it/change directories in it whatever, and then popd at the end.
+//  I'll also be integrating the current stack into the custom prompt whenever I get around to doing that
+[Cmdlet(VerbsCommon.Show, GitCommands.GitRepoNoun)]
+public class ShowGitRepoCommand : PSCmdlet
+{
+	[Parameter(
+		Position = 0,
+		ValueFromPipeline = true,
+		Mandatory = true,
+		HelpMessage = "Reference name for the repo")]
+	public string? Name { get; set; }
+
+	[Parameter(
+		Mandatory = false,
+		HelpMessage = "Changes directory directly instead of using Set-Location")]
+	[Alias("NoSetLocation")]
+	public SwitchParameter NoStack { get; set; }
+
+	protected override void BeginProcessing()
+	{
+		var location = GitManager.Instance.GetRepo(Name);
+
+		// By default instead of doing the same as cd, we instead do pushd so a user can popd straight back to where
+		// they came from.
+		// TODO: incorporate this into the custom prompt when I develop that
+		if (!NoStack)
+		{
+			// Push the current location to the stack
+			// TODO: support named stacks. PowerShell *-Location commands support named stacks, but I don't personally
+			//  use them myself so I haven't implemented them initially. I would like to in the future though, but right
+			//  now it's low value to me.
+			//  https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.management/set-location?view=powershell-7.6#example-4-set-the-current-location-to-a-named-stack
+			SessionState.Path.PushCurrentLocation(null);
+		}
+
+		SessionState.Path.SetLocation(location);
+		base.BeginProcessing();
+	}
+}

src/PowershellModule/PostBuild.ps1

@@ -22,6 +22,7 @@ $allowList = @(
     "ModuleCore*"
     "PowershellModule*"
     "*SQLite*"
+    "data"
 )
 Write-Host "Removing all non-module required files from '$targetDir'"
 Get-ChildItem -Path $targetDir -exclude $allowList | Remove-Item -Recurse

src/PowershellModule/PowershellModule.csproj

@@ -12,7 +12,6 @@
     <PackageReference Include="PowerShellStandard.Library" >
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="sqlite-net-pcl" />
     <PackageReference Include="System.Management.Automation" />
   </ItemGroup>
 

tests/ModuleTests/Git/AddRegistrationTests.cs

@@ -74,4 +74,44 @@ public class AddRegistrationTests
 
 		Assert.Equal("repo", whitespaceName);
 	}
+
+	[Fact]
+	public void DuplicateRepoRegistrationShouldFail()
+	{
+		Settings.UseFileName(nameof(RepoRegistrationWithWhitespaceName));
+
+		var gitManager = GitManager.InternalFreshInstance;
+		var testRepoAbsolutePath = "Test:/some/test/repo";
+		string[] paths = ["test", "nested", "path"];
+		var names = (NormalSeparator: string.Join(Path.DirectorySeparatorChar, paths), AltSeparator: string.Join(Path.AltDirectorySeparatorChar, paths));
+
+		var firstRegistration = gitManager.RegisterRepo(testRepoAbsolutePath, names.NormalSeparator);
+		// TODO: make nested registrations fail in both directions and test
+		var secondRegistration = gitManager.RegisterRepo(testRepoAbsolutePath, Path.Combine(paths[..1]));
+
+		Assert.Equal(Path.Combine(paths), firstRegistration);
+		Assert.Equal(Path.Combine(paths[..1]), secondRegistration);
+
+		Assert.Throws<Exception>(() => gitManager.RegisterRepo(testRepoAbsolutePath, Path.Combine(paths[..1])));
+	}
+
+	[Fact]
+	public void DuplicateRepoRegistrationDifferentSlashShouldNotFail()
+	{
+		Settings.UseFileName(nameof(RepoRegistrationWithWhitespaceName));
+
+		var gitManager = GitManager.InternalFreshInstance;
+		var testRepoAbsolutePath = "Test:/some/test/repo";
+		string[] paths = ["test", "nested", "path"];
+		var names = (NormalSeparator: string.Join(Path.DirectorySeparatorChar, paths), AltSeparator: string.Join(Path.AltDirectorySeparatorChar, paths));
+
+		var firstRegistration = gitManager.RegisterRepo(testRepoAbsolutePath, names.NormalSeparator);
+		// TODO: make nested registrations fail in both directions and test
+		var secondRegistration = gitManager.RegisterRepo(testRepoAbsolutePath, Path.Combine(paths[..1]));
+		var differentPathSeparatorRegistration = gitManager.RegisterRepo(testRepoAbsolutePath, names.AltSeparator);
+
+		Assert.Equal(Path.Combine(paths), firstRegistration);
+		Assert.Equal(Path.Combine(paths[..1]), secondRegistration);
+		Assert.Equal(names.AltSeparator, differentPathSeparatorRegistration);
+	}
 }

tests/ModuleTests/Git/Snapshots/AddRegistrationTests/BasicRepoRegistration_2.verified.txt

@@ -1,2 +1,2 @@
 Attempted to register: other/path
-Registration result: other\path
+Registration result: other/path