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//
// AutoSave.cs
//
// Author:
// Mike Krüger <mkrueger@novell.com>
//
// Copyright (c) 2009 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using MonoDevelop.Core;
using Gtk;
using MonoDevelop.Core.Text;
namespace MonoDevelop.Ide.Editor
{
/// <summary>
/// This class handles the auto save mechanism for open files.
/// It should only be used by editor implementations.
/// </summary>
static class AutoSave
{
//FIXME: is this path a good one? wouldn't it be better to put autosaves beside the files anyway?
static string autoSavePath = UserProfile.Current.CacheDir.Combine ("AutoSave");
static bool autoSaveEnabled;
static AutoSave ()
{
try {
if (!Directory.Exists (autoSavePath))
Directory.CreateDirectory (autoSavePath);
} catch (Exception e) {
LoggingService.LogError ("Can't create auto save path:" + autoSavePath +". Auto save is disabled.", e);
autoSaveEnabled = false;
return;
}
autoSaveEnabled = true;
StartAutoSaveThread ();
}
static string GetAutoSaveFileName (string fileName)
{
if (fileName == null)
return null;
string newFileName = Path.Combine (Path.GetDirectoryName (fileName), Path.GetFileNameWithoutExtension (fileName) + Path.GetExtension (fileName) + "~");
newFileName = Path.Combine (autoSavePath, newFileName.Replace(',','_').Replace(" ","").Replace (":","").Replace (Path.DirectorySeparatorChar, '_').Replace (Path.AltDirectorySeparatorChar, '_'));
return newFileName;
}
/// <summary>
/// Returns true if an auto save exists for the given file name.
/// </summary>
public static bool AutoSaveExists (string fileName)
{
if (!autoSaveEnabled)
return false;
try {
var autoSaveFilename = GetAutoSaveFileName (fileName);
bool autoSaveExists = File.Exists (autoSaveFilename);
if (autoSaveExists) {
if (File.GetLastWriteTimeUtc (autoSaveFilename) < File.GetLastWriteTimeUtc (fileName)) {
File.Delete (autoSaveFilename);
return false;
}
}
return autoSaveExists;
} catch (Exception e) {
LoggingService.LogError ("Error in auto save - disableing.", e);
DisableAutoSave ();
return false;
}
}
static void CreateAutoSave (string fileName, ITextSource content)
{
if (!autoSaveEnabled)
return;
try {
// Directory may have removed/unmounted. Therefore this operation is not guaranteed to work.
var autosaveFileName = GetAutoSaveFileName (fileName);
if (File.Exists (autosaveFileName))
File.Delete (autosaveFileName);
content.WriteTextTo (autosaveFileName);
Counters.AutoSavedFiles++;
} catch (Exception e) {
LoggingService.LogError ("Error in auto save while creating: " + fileName +". Disableing auto save.", e);
DisableAutoSave ();
}
}
#region AutoSave
class FileContent
{
public string FileName;
public ITextSource Content;
public FileContent (string fileName, ITextSource content)
{
this.FileName = fileName;
this.Content = content;
}
}
static readonly AutoResetEvent resetEvent = new AutoResetEvent (false);
public static bool Running {
get {
return autoSaveThreadRunning;
}
}
static bool autoSaveThreadRunning = false;
static Thread autoSaveThread;
static Queue<FileContent> queue = new Queue<FileContent> ();
static object contentLock = new object ();
static void StartAutoSaveThread ()
{
autoSaveThreadRunning = true;
if (autoSaveThread == null) {
autoSaveThread = new Thread (AutoSaveThread);
autoSaveThread.Name = "Autosave";
autoSaveThread.IsBackground = true;
autoSaveThread.Start ();
}
}
static void AutoSaveThread ()
{
while (autoSaveThreadRunning) {
resetEvent.WaitOne ();
while (queue.Count > 0) {
var content = queue.Dequeue ();
// Don't create an auto save for unsaved files.
if (string.IsNullOrEmpty (content.FileName))
continue;
CreateAutoSave (content.FileName, content.Content);
}
}
}
/// <summary>
/// Loads the content from an auto save file and removes the auto save file.
/// </summary>
public static ITextSource LoadAndRemoveAutoSave (string fileName)
{
string autoSaveFileName = GetAutoSaveFileName (fileName);
var result = StringTextSource.ReadFrom (autoSaveFileName);
AutoSave.RemoveAutoSaveFile (fileName);
return result;
}
/// <summary>
/// Loads the content from an auto save file.
/// </summary>
public static ITextSource LoadAutoSave (string fileName)
{
string autoSaveFileName = GetAutoSaveFileName (fileName);
return StringTextSource.ReadFrom (autoSaveFileName);
}
/// <summary>
/// Removes the auto save file.
/// </summary>
/// <param name="fileName">The file name for which the auto save file should be removed.</param>
public static void RemoveAutoSaveFile (string fileName)
{
if (!autoSaveEnabled)
return;
if (AutoSaveExists (fileName)) {
string autoSaveFileName = GetAutoSaveFileName (fileName);
try {
lock (contentLock) {
File.Delete (autoSaveFileName);
}
} catch (Exception e) {
LoggingService.LogError ("Can't delete auto save file: " + autoSaveFileName +". Disableing auto save.", e);
DisableAutoSave ();
}
}
}
internal static void InformAutoSaveThread (ITextSource content, string fileName, bool isDirty)
{
if (content == null || !autoSaveEnabled)
return;
if (isDirty) {
queue.Enqueue (new FileContent (fileName, content));
resetEvent.Set ();
} else {
RemoveAutoSaveFile (fileName);
}
}
static void DisableAutoSave ()
{
autoSaveThreadRunning = false;
if (autoSaveThread != null) {
resetEvent.Set ();
autoSaveThread.Join ();
autoSaveThread = null;
}
autoSaveEnabled = false;
}
#endregion
}
}
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