Feature: Git Integration Phase 3

src/Files.App/Data/Items/BranchItem.cs

@@ -0,0 +1,7 @@
+// Copyright (c) 2023 Files Community
+// Licensed under the MIT License. See the LICENSE.
+
+namespace Files.App.Data.Items
+{
+	public record BranchItem(string Name, bool IsRemote);
+}

src/Files.App/Data/Models/DirectoryPropertiesViewModel.cs

@@ -1,14 +1,23 @@
 // Copyright (c) 2023 Files Community
 // Licensed under the MIT License. See the LICENSE.
 
+using System.Windows.Input;
+
 namespace Files.App.Data.Models
 {
 	public class DirectoryPropertiesViewModel : ObservableObject
 	{
-		public int ActiveBranchIndex { get; private set; }
+		// The first branch will always be the active one.
+		public const int ACTIVE_BRANCH_INDEX = 0;
+
+		private string? _gitRepositoryPath;
+
+		private readonly ObservableCollection<string> _localBranches = new();
 
-		private string _DirectoryItemCount;
-		public string DirectoryItemCount
+		private readonly ObservableCollection<string> _remoteBranches = new();
+
+		private string? _DirectoryItemCount;
+		public string? DirectoryItemCount
 		{
 			get => _DirectoryItemCount;
 			set => SetProperty(ref _DirectoryItemCount, value);
@@ -27,29 +36,68 @@ public int SelectedBranchIndex
 			get => _SelectedBranchIndex;
 			set
 			{
-				if (SetProperty(ref _SelectedBranchIndex, value) && value != -1 && value != ActiveBranchIndex)
+				if (SetProperty(ref _SelectedBranchIndex, value) && 
+					value != -1 && 
+					(value != ACTIVE_BRANCH_INDEX || !_ShowLocals))
+				{
 					CheckoutRequested?.Invoke(this, BranchesNames[value]);
+				}
 			}
 		}
 
-		public ObservableCollection<string> BranchesNames { get; } = new();
+		private bool _ShowLocals = true;
+		public bool ShowLocals
+		{
+			get => _ShowLocals;
+			set
+			{
+				if (SetProperty(ref _ShowLocals, value))
+				{
+					OnPropertyChanged(nameof(BranchesNames));
+
+					if (value)
+						SelectedBranchIndex = ACTIVE_BRANCH_INDEX;
+				}
+			}
+		}
+
+		public ObservableCollection<string> BranchesNames => _ShowLocals 
+			? _localBranches 
+			: _remoteBranches;
 
 		public EventHandler<string>? CheckoutRequested;
 
-		public void UpdateGitInfo(bool isGitRepository, string activeBranch, string[] branches)
+		public ICommand NewBranchCommand { get; }
+
+		public DirectoryPropertiesViewModel()
+		{
+			NewBranchCommand = new AsyncRelayCommand(() 
+				=> GitHelpers.CreateNewBranch(_gitRepositoryPath!, _localBranches[ACTIVE_BRANCH_INDEX]));
+		}
+
+		public void UpdateGitInfo(bool isGitRepository, string? repositoryPath, BranchItem[] branches)
 		{
-			GitBranchDisplayName = isGitRepository
-				? string.Format("Branch".GetLocalizedResource(), activeBranch)
+			GitBranchDisplayName = isGitRepository && branches.Any()
+				? string.Format("Branch".GetLocalizedResource(), branches[ACTIVE_BRANCH_INDEX].Name)
 				: null;
 
+			_gitRepositoryPath = repositoryPath;
+			ShowLocals = true;
+
 			if (isGitRepository)
 			{
-				BranchesNames.Clear();
-				foreach (var name in branches)
-					BranchesNames.Add(name);
+				_localBranches.Clear();
+				_remoteBranches.Clear();
+
+				foreach (var branch in branches)
+				{
+					if (branch.IsRemote)
+						_remoteBranches.Add(branch.Name);
+					else
+						_localBranches.Add(branch.Name);
+				}
 
-				ActiveBranchIndex = BranchesNames.IndexOf(activeBranch);
-				SelectedBranchIndex = ActiveBranchIndex;
+				SelectedBranchIndex = ACTIVE_BRANCH_INDEX;
 			}
 		}
 	}

src/Files.App/Dialogs/AddBranchDialog.xaml

@@ -0,0 +1,102 @@
+<!--  Copyright (c) 2023 Files Community. Licensed under the MIT License. See the LICENSE.  -->
+<ContentDialog
+	x:Class="Files.App.Dialogs.AddBranchDialog"
+	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	xmlns:helpers="using:Files.App.Helpers"
+	xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	x:Name="AddBranch"
+	Title="{helpers:ResourceString Name=CreateNewBranch}"
+	Closing="ContentDialog_Closing"
+	CornerRadius="{StaticResource OverlayCornerRadius}"
+	DefaultButton="Primary"
+	IsPrimaryButtonEnabled="{x:Bind ViewModel.IsBranchValid, Mode=OneWay}"
+	PrimaryButtonStyle="{StaticResource AccentButtonStyle}"
+	PrimaryButtonText="{helpers:ResourceString Name=Create}"
+	RequestedTheme="{x:Bind helpers:ThemeHelper.RootTheme}"
+	SecondaryButtonText="{helpers:ResourceString Name=Cancel}"
+	Style="{StaticResource DefaultContentDialogStyle}"
+	mc:Ignorable="d">
+
+	<StackPanel Width="440" Spacing="4">
+		<!--  Branch Name  -->
+		<Grid
+			Padding="12"
+			Background="{ThemeResource CardBackgroundFillColorDefaultBrush}"
+			BorderBrush="{ThemeResource CardStrokeColorDefaultBrush}"
+			BorderThickness="1"
+			ColumnSpacing="8"
+			CornerRadius="4">
+			<Grid.ColumnDefinitions>
+				<ColumnDefinition Width="*" />
+				<ColumnDefinition Width="Auto" />
+			</Grid.ColumnDefinitions>
+			<TextBlock
+				Grid.Column="0"
+				VerticalAlignment="Center"
+				Text="{helpers:ResourceString Name=Name}" />
+			<TextBox
+				x:Name="BranchNameBox"
+				Grid.Column="1"
+				Width="260"
+				PlaceholderText="{helpers:ResourceString Name=EnterName}"
+				Text="{x:Bind ViewModel.NewBranchName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
+				<TextBox.Resources>
+					<TeachingTip
+						x:Name="InvalidNameWarning"
+						Title="{helpers:ResourceString Name=InvalidBranchName}"
+						IsOpen="{x:Bind ViewModel.ShowWarningTip, Mode=OneWay}"
+						PreferredPlacement="Bottom"
+						Target="{x:Bind BranchNameBox}" />
+				</TextBox.Resources>
+			</TextBox>
+		</Grid>
+
+		<!--  Branch Options  -->
+		<Grid
+			Padding="12"
+			Background="{ThemeResource CardBackgroundFillColorDefaultBrush}"
+			BorderBrush="{ThemeResource CardStrokeColorDefaultBrush}"
+			BorderThickness="1"
+			ColumnSpacing="8"
+			CornerRadius="4"
+			RowSpacing="12">
+			<Grid.ColumnDefinitions>
+				<ColumnDefinition Width="*" />
+				<ColumnDefinition Width="Auto" />
+			</Grid.ColumnDefinitions>
+			<Grid.RowDefinitions>
+				<RowDefinition Height="Auto" />
+				<RowDefinition Height="Auto" />
+			</Grid.RowDefinitions>
+
+			<!--  Based On  -->
+			<TextBlock
+				Grid.Row="0"
+				Grid.Column="0"
+				VerticalAlignment="Center"
+				Text="{helpers:ResourceString Name=BasedOn}" />
+			<ComboBox
+				x:Name="BranchBox"
+				Grid.Row="0"
+				Grid.Column="1"
+				Width="160"
+				ItemsSource="{x:Bind ViewModel.Branches}"
+				SelectedItem="{x:Bind ViewModel.BasedOn, Mode=TwoWay}" />
+
+			<!--  Switch To Branch  -->
+			<TextBlock
+				Grid.Row="1"
+				Grid.Column="0"
+				VerticalAlignment="Center"
+				Text="{helpers:ResourceString Name=SwitchToNewBranch}" />
+			<ToggleSwitch
+				Grid.Row="1"
+				Grid.Column="1"
+				MinWidth="0"
+				HorizontalAlignment="Right"
+				IsOn="{x:Bind ViewModel.Checkout, Mode=TwoWay}" />
+		</Grid>
+	</StackPanel>
+</ContentDialog>

src/Files.App/Dialogs/AddBranchDialog.xaml.cs

@@ -0,0 +1,33 @@
+// Copyright (c) 2023 Files Community
+// Licensed under the MIT License. See the LICENSE.
+
+using Files.App.ViewModels.Dialogs;
+using Files.Backend.ViewModels.Dialogs;
+using Microsoft.UI.Xaml.Controls;
+
+// The Content Dialog item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace Files.App.Dialogs
+{
+	public sealed partial class AddBranchDialog : ContentDialog, IDialog<AddBranchDialogViewModel>
+	{
+		public AddBranchDialogViewModel ViewModel
+		{
+			get => (AddBranchDialogViewModel)DataContext;
+			set => DataContext = value;
+		}
+
+		public AddBranchDialog()
+		{
+			InitializeComponent();
+		}
+
+		public new async Task<DialogResult> ShowAsync() => (DialogResult)await base.ShowAsync();
+
+		private void ContentDialog_Closing(ContentDialog _, ContentDialogClosingEventArgs e)
+		{
+			InvalidNameWarning.IsOpen = false;
+			Closing -= ContentDialog_Closing;
+		}
+	}
+}

src/Files.App/Helpers/GitHelpers.cs

@@ -2,13 +2,20 @@
 // Licensed under the MIT License. See the LICENSE.
 
 using Files.App.Filesystem.StorageItems;
+using Files.App.ViewModels.Dialogs;
+using Files.Backend.Services;
 using LibGit2Sharp;
 using Microsoft.AppCenter.Analytics;
+using System.Text.RegularExpressions;
 
 namespace Files.App.Helpers
 {
-	public static class GitHelpers
+	internal static class GitHelpers
 	{
+		private const string BRANCH_NAME_PATTERN = @"^(?!/)(?!.*//)[^\000-\037\177 ~^:?*[]+(?!.*\.\.)(?!.*@\{)(?!.*\\)(?<!/\.)(?<!\.)(?<!/)(?<!\.lock)$";
+
+		private const int END_OF_ORIGIN_PREFIX = 7;
+
 		public static string? GetGitRepositoryPath(string? path, string root)
 		{
 			if (root.EndsWith('\\'))
@@ -34,17 +41,18 @@ public static class GitHelpers
 			}
 		}
 
-		public static string[] GetLocalBranchesNames(string? path)
+		public static BranchItem[] GetBranchesNames(string? path)
 		{
 			if (string.IsNullOrWhiteSpace(path) || !Repository.IsValid(path))
-				return Array.Empty<string>();
+				return Array.Empty<BranchItem>();
 
 			using var repository = new Repository(path);
 			return repository.Branches
-				.Where(b => !b.IsRemote)
+				.Where(b => !b.IsRemote || b.RemoteName == "origin")
 				.OrderByDescending(b => b.IsCurrentRepositoryHead)
+				.ThenBy(b => b.IsRemote)
 				.ThenByDescending(b => b.Tip.Committer.When)
-				.Select(b => b.FriendlyName)
+				.Select(b => new BranchItem(b.FriendlyName, b.IsRemote))
 				.ToArray();
 		}
 
@@ -79,21 +87,87 @@ public static async Task<bool> Checkout(string? repositoryPath, string? branch)
 						break;
 					case GitCheckoutOptions.BringChanges:
 					case GitCheckoutOptions.StashChanges:
-						repository.Stashes.Add(repository.Config.BuildSignature(DateTimeOffset.Now));
+						var signature = repository.Config.BuildSignature(DateTimeOffset.Now);
+						if (signature is null)
+							return false;
+
+						repository.Stashes.Add(signature);
 
 						isBringingChanges = resolveConflictOption is GitCheckoutOptions.BringChanges;
 						break;
 				}
 			}
 
-			LibGit2Sharp.Commands.Checkout(repository, checkoutBranch, options);
+			try
+			{
+				if (checkoutBranch.IsRemote)
+					CheckoutRemoteBranch(repository, checkoutBranch);
+				else
+					LibGit2Sharp.Commands.Checkout(repository, checkoutBranch, options);
 
-			if (isBringingChanges)
+				if (isBringingChanges)
+				{
+					var lastStashIndex = repository.Stashes.Count() - 1;
+					repository.Stashes.Pop(lastStashIndex, new StashApplyOptions());
+				}
+				return true;
+			}
+			catch (Exception)
 			{
-				var lastStashIndex = repository.Stashes.Count() - 1;
-				repository.Stashes.Pop(lastStashIndex, new StashApplyOptions());
+				return false;
 			}
-			return true;
+		}
+
+		public static async Task CreateNewBranch(string repositoryPath, string activeBranch)
+		{
+			var viewModel = new AddBranchDialogViewModel(repositoryPath, activeBranch);
+			var dialog = Ioc.Default.GetRequiredService<IDialogService>().GetDialog(viewModel);
+
+			var result = await dialog.TryShowAsync();
+
+			if (result != DialogResult.Primary)
+				return;
+
+			using var repository = new Repository(repositoryPath);
+
+			if (repository.Head.FriendlyName.Equals(viewModel.NewBranchName) ||
+				await Checkout(repositoryPath, viewModel.BasedOn))
+			{
+				Analytics.TrackEvent($"Triggered git branch");
+
+				repository.CreateBranch(viewModel.NewBranchName);
+
+				if (viewModel.Checkout)
+					await Checkout(repositoryPath, viewModel.NewBranchName);
+			}
+		}
+
+		public static bool ValidateBranchNameForRepository(string branchName, string repositoryPath)
+		{
+			if (string.IsNullOrEmpty(branchName) || !Repository.IsValid(repositoryPath))
+				return false;
+
+			var nameValidator = new Regex(BRANCH_NAME_PATTERN);
+			if (!nameValidator.IsMatch(branchName))
+				return false;
+
+			using var repository = new Repository(repositoryPath);
+			return !repository.Branches.Any(branch =>
+				branch.FriendlyName.Equals(branchName, StringComparison.OrdinalIgnoreCase));
+		}
+
+		private static void CheckoutRemoteBranch(Repository repository, Branch branch)
+		{
+			var uniqueName = branch.FriendlyName.Substring(END_OF_ORIGIN_PREFIX);
+
+			var discriminator = 0;
+			while (repository.Branches.Any(b => !b.IsRemote && b.FriendlyName == uniqueName))
+				uniqueName = $"{branch.FriendlyName}_{++discriminator}";
+
+			var newBranch = repository.CreateBranch(uniqueName, branch.Tip);
+			repository.Branches.Update(newBranch, b => b.TrackedBranch = branch.CanonicalName);
+
+			LibGit2Sharp.Commands.Checkout(repository, newBranch);
 		}
 	}
 }

src/Files.App/ServicesImplementation/DialogService.cs

@@ -36,7 +36,8 @@ public DialogService()
 				{ typeof(DecompressArchiveDialogViewModel), () => new DecompressArchiveDialog() },
 				{ typeof(SettingsDialogViewModel), () => new SettingsDialog() },
 				{ typeof(CreateShortcutDialogViewModel), () => new CreateShortcutDialog() },
-				{ typeof(ReorderSidebarItemsDialogViewModel), () => new ReorderSidebarItemsDialog() }
+				{ typeof(ReorderSidebarItemsDialogViewModel), () => new ReorderSidebarItemsDialog() },
+				{ typeof(AddBranchDialogViewModel), () => new AddBranchDialog() }
 			};
 		}