ForceUTF8Package.cs

using System;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using System.ComponentModel.Design;
using Microsoft.Win32;
using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell.Interop;
using Microsoft.VisualStudio.OLE.Interop;
using Microsoft.VisualStudio.Shell;
using EnvDTE;
using EnvDTE80;
using System.Text;
using System.IO;

namespace VILICVANE.ForceUTF8
{
    /// <summary>
    /// This is the class that implements the package exposed by this assembly.
    ///
    /// The minimum requirement for a class to be considered a valid package for Visual Studio
    /// is to implement the IVsPackage interface and register itself with the shell.
    /// This package uses the helper classes defined inside the Managed Package Framework (MPF)
    /// to do it: it derives from the Package class that provides the implementation of the 
    /// IVsPackage interface and uses the registration attributes defined in the framework to 
    /// register itself and its components with the shell.
    /// </summary>
    // This attribute tells the PkgDef creation utility (CreatePkgDef.exe) that this class is
    // a package.
    [PackageRegistration(UseManagedResourcesOnly = true)]
    // This attribute is used to register the information needed to show this package
    // in the Help/About dialog of Visual Studio.
    [InstalledProductRegistration("#110", "#112", "1.0", IconResourceID = 400)]
    [ProvideAutoLoad(UIContextGuids80.SolutionExists)]
    [Guid(GuidList.guidForceUTF8PkgString)]
    public sealed class ForceUTF8Package : Package
    {
        /// <summary>
        /// Default constructor of the package.
        /// Inside this method you can place any initialization code that does not require 
        /// any Visual Studio service because at this point the package object is created but 
        /// not sited yet inside Visual Studio environment. The place to do all the other 
        /// initialization is the Initialize method.
        /// </summary>
        public ForceUTF8Package()
        {
            Debug.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering constructor for: {0}", this.ToString()));
        }



        /////////////////////////////////////////////////////////////////////////////
        // Overridden Package Implementation
        #region Package Members

        private DocumentEvents documentEvents;

        /// <summary>
        /// Initialization of the package; this method is called right after the package is sited, so this is the place
        /// where you can put all the initialization code that rely on services provided by VisualStudio.
        /// </summary>
        protected override void Initialize()
        {
            Debug.WriteLine (string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
            base.Initialize();

            var dte = GetService(typeof(DTE)) as DTE2;
            documentEvents = dte.Events.DocumentEvents;
            documentEvents.DocumentSaved += documentEvents_DocumentSaved;
        }

        void documentEvents_DocumentSaved(Document document) {
            if (document.Kind != "{8E7B96A8-E33D-11D0-A6D5-00C04FB67F6A}") {
                // then it's not a text file
                return;
            }

            var path = document.FullName;

            var stream = new FileStream(path, FileMode.Open);
            var reader = new StreamReader(stream, Encoding.Default, true);
            reader.Read();

            if (reader.CurrentEncoding != Encoding.Default) {
                stream.Close();
                return;
            }

            string text;

            try {
                stream.Position = 0;
                reader = new StreamReader(stream, new UTF8Encoding(false, true));
                reader.ReadToEnd();
                stream.Close();
            }
            catch (DecoderFallbackException) {
                stream.Position = 0;
                reader = new StreamReader(stream, Encoding.Default);
                text = reader.ReadToEnd();
                stream.Close();
                File.WriteAllText(path, text, new UTF8Encoding(false));
            }
        }
        #endregion

    }
}