sourcegit/src/ViewModels/FileTreeNode.cs at master · protoface/sourcegit · GitHub

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using CommunityToolkit.Mvvm.ComponentModel;
using System.Collections.Generic;

namespace SourceGit.ViewModels {
	public class FileTreeNode : ObservableObject {
		public string FullPath { get; set; } = string.Empty;
		public bool IsFolder { get; set; } = false;
		public object Backend { get; set; } = null;
		public List<FileTreeNode> Children { get; set; } = new List<FileTreeNode>();

		public bool IsExpanded {
			get => _isExpanded;
			set => SetProperty(ref _isExpanded, value);
		}

		public static List<FileTreeNode> Build(List<Models.Change> changes) {
			var nodes = new List<FileTreeNode>();
			var folders = new Dictionary<string, FileTreeNode>();
			var expanded = changes.Count <= 50;

			foreach (var c in changes) {
				var sepIdx = c.Path.IndexOf('/');
				if (sepIdx == -1) {
					nodes.Add(new FileTreeNode() {
						FullPath = c.Path,
						Backend = c,
						IsFolder = false,
						IsExpanded = false
					});
				} else {
					FileTreeNode lastFolder = null;
					var start = 0;

					while (sepIdx != -1) {
						var folder = c.Path.Substring(0, sepIdx);
						if (folders.ContainsKey(folder)) {
							lastFolder = folders[folder];
						} else if (lastFolder == null) {
							lastFolder = new FileTreeNode() {
								FullPath = folder,
								Backend = null,
								IsFolder = true,
								IsExpanded = expanded
							};
							nodes.Add(lastFolder);
							folders.Add(folder, lastFolder);
						} else {
							var cur = new FileTreeNode() {
								FullPath = folder,
								Backend = null,
								IsFolder = true,
								IsExpanded = expanded
							};
							folders.Add(folder, cur);
							lastFolder.Children.Add(cur);
							lastFolder = cur;
						}

						start = sepIdx + 1;
						sepIdx = c.Path.IndexOf('/', start);
					}

					lastFolder.Children.Add(new FileTreeNode() {
						FullPath = c.Path,
						Backend = c,
						IsFolder = false,
						IsExpanded = false
					});
				}
			}

			folders.Clear();
			Sort(nodes);
			return nodes;
		}

		public static List<FileTreeNode> Build(List<Models.Object> files) {
			var nodes = new List<FileTreeNode>();
			var folders = new Dictionary<string, FileTreeNode>();
			var expanded = files.Count <= 50;

			foreach (var f in files) {
				var sepIdx = f.Path.IndexOf('/');
				if (sepIdx == -1) {
					nodes.Add(new FileTreeNode() {
						FullPath = f.Path,
						Backend = f,
						IsFolder = false,
						IsExpanded = false
					});
				} else {
					FileTreeNode lastFolder = null;
					var start = 0;

					while (sepIdx != -1) {
						var folder = f.Path.Substring(0, sepIdx);
						if (folders.ContainsKey(folder)) {
							lastFolder = folders[folder];
						} else if (lastFolder == null) {
							lastFolder = new FileTreeNode() {
								FullPath = folder,
								Backend = null,
								IsFolder = true,
								IsExpanded = expanded
							};
							nodes.Add(lastFolder);
							folders.Add(folder, lastFolder);
						} else {
							var cur = new FileTreeNode() {
								FullPath = folder,
								Backend = null,
								IsFolder = true,
								IsExpanded = expanded
							};
							folders.Add(folder, cur);
							lastFolder.Children.Add(cur);
							lastFolder = cur;
						}

						start = sepIdx + 1;
						sepIdx = f.Path.IndexOf('/', start);
					}

					lastFolder.Children.Add(new FileTreeNode() {
						FullPath = f.Path,
						Backend = f,
						IsFolder = false,
						IsExpanded = false
					});
				}
			}

			folders.Clear();
			Sort(nodes);
			return nodes;
		}

		public static FileTreeNode SelectByPath(List<FileTreeNode> nodes, string path) {
			foreach (var node in nodes) {
				if (node.FullPath == path)
					return node;

				if (node.IsFolder && path.StartsWith(node.FullPath + "/")) {
					var foundInChildren = SelectByPath(node.Children, path);
					if (foundInChildren != null) {
						node.IsExpanded = true;
					}
					return foundInChildren;
				}
			}

			return null;
		}

		private static void Sort(List<FileTreeNode> nodes) {
			nodes.Sort((l, r) => {
				if (l.IsFolder == r.IsFolder) {
					return l.FullPath.CompareTo(r.FullPath);
				} else {
					return l.IsFolder ? -1 : 1;
				}
			});

			foreach (var node in nodes) {
				if (node.Children.Count > 1)
					Sort(node.Children);
			}
		}

		private bool _isExpanded = true;
	}
}