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//-----------------------------------------------------------------------
// <copyright file="Purge.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.BuildTasks {
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
/// <summary>
/// Purges directory trees of all directories and files that are not on a whitelist.
/// </summary>
/// <remarks>
/// This task performs a function similar to robocopy's /MIR switch, except that
/// this task does not require that an entire directory tree be used as the source
/// in order to purge old files from the destination.
/// </remarks>
public class Purge : Task {
/// <summary>
/// Initializes a new instance of the <see cref="Purge"/> class.
/// </summary>
public Purge() {
this.PurgeEmptyDirectories = true;
}
/// <summary>
/// Gets or sets the root directories to purge.
/// </summary>
/// <value>The directories.</value>
[Required]
public string[] Directories { get; set; }
/// <summary>
/// Gets or sets the files that should be NOT be purged.
/// </summary>
[Required]
public ITaskItem[] IntendedFiles { get; set; }
/// <summary>
/// Gets or sets a value indicating whether empty directories will be deleted.
/// </summary>
/// <value>
/// The default value is <c>true</c>.
/// </value>
public bool PurgeEmptyDirectories { get; set; }
/// <summary>
/// Executes this instance.
/// </summary>
public override bool Execute() {
HashSet<string> intendedFiles = new HashSet<string>(this.IntendedFiles.Select(file => file.GetMetadata("FullPath")), StringComparer.OrdinalIgnoreCase);
foreach (string directory in this.Directories.Select(dir => NormalizePath(dir)).Where(dir => Directory.Exists(dir))) {
foreach (string existingFile in Directory.GetFiles(directory, "*", SearchOption.AllDirectories)) {
if (!intendedFiles.Contains(existingFile)) {
this.Log.LogWarning("Purging file \"{0}\".", existingFile);
File.Delete(existingFile);
}
}
if (this.PurgeEmptyDirectories) {
foreach (string subdirectory in Directory.GetDirectories(directory, "*", SearchOption.AllDirectories)) {
// We have to check for the existance of the directory because it MAY be
// a descendent of a directory we already deleted in this loop.
if (Directory.Exists(subdirectory)) {
if (Directory.GetDirectories(subdirectory).Length == 0 && Directory.GetFiles(subdirectory).Length == 0) {
this.Log.LogWarning("Purging empty directory \"{0}\".", subdirectory);
Directory.Delete(subdirectory);
}
}
}
}
}
return !this.Log.HasLoggedErrors;
}
private static string NormalizePath(string path) {
return Path.GetFullPath(Regex.Replace(path, @"\\+", @"\"));
}
}
}
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