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ConsoleProgressMonitor.cs

//
// ConsoleProgressMonitor.cs
//
// Author:
//   Lluis Sanchez Gual
//
// Copyright (C) 2007 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.IO;

namespace Mono.Addins.Setup.ProgressMonitoring
{
      internal class ConsoleProgressMonitor: NullProgressMonitor
      {
            int columns = 80;
            bool indent = true;
            bool wrap = true;
            int ilevel = 0;
            int isize = 3;
            int col = -1;
            int logLevel;
            LogTextWriter logger;
            
            public ConsoleProgressMonitor (): this (1)
            {
            }
            
            public ConsoleProgressMonitor (int logLevel)
            {
                  this.logLevel = logLevel;
                  logger = new LogTextWriter ();
                  logger.TextWritten += new LogTextEventHandler (WriteLog);
            }
            
            public bool WrapText {
                  get { return wrap; }
                  set { wrap = value; }
            }
            
            public int WrapColumns {
                  get { return columns; }
                  set { columns = value; }
            }
            
            public bool IndentTasks {
                  get { return indent; }
                  set { indent = value; }
            }
            
            public override int LogLevel {
                  get { return logLevel; }
            }
            
            public override void BeginTask (string name, int totalWork)
            {
                  WriteText (name);
                  Indent ();
            }
            
            public override void BeginStepTask (string name, int totalWork, int stepSize)
            {
                  BeginTask (name, totalWork);
            }
            
            public override void EndTask ()
            {
                  Unindent ();
            }
            
            void WriteLog (string text)
            {
                  WriteText (text);
            }
            
            public override TextWriter Log {
                  get { return logger; }
            }
            
            public override void ReportSuccess (string message)
            {
                  WriteText (message);
            }
            
            public override void ReportWarning (string message)
            {
                  if (logLevel != 0)
                        WriteText ("WARNING: " + message + "\n");
            }
            
            public override void ReportError (string message, Exception ex)
            {
                  if (logLevel == 0)
                        return;
                  
                  if (message != null && ex != null) {
                        WriteText ("ERROR: " + message + "\n");
                        if (logLevel > 1)
                              WriteText (ex + "\n");
                  }
                  if (message != null)
                        WriteText ("ERROR: " + message + "\n");
                  else if (ex != null) {
                        if (logLevel > 1)
                              WriteText ("ERROR: " + ex + "\n");
                        else
                              WriteText ("ERROR: " + ex.Message + "\n");
                  }
            }
            
            void WriteText (string text)
            {
                  if (indent)
                        WriteText (text, ilevel);
                  else
                        WriteText (text, 0);
            }
            
            void WriteText (string text, int leftMargin)
            {
                  if (text == null || text.Length == 0)
                        return;

                  int n = 0;
                  int maxCols = wrap ? columns : int.MaxValue;

                  while (n < text.Length)
                  {
                        if (col == -1) {
                              Console.Write (new String (' ', leftMargin));
                              col = leftMargin;
                        }
                        
                        int lastWhite = -1;
                        int sn = n;
                        bool eol = false;
                        
                        while (col < maxCols && n < text.Length) {
                              char c = text [n];
                              if (c == '\r') {
                                    n++;
                                    continue;
                              }
                              if (c == '\n') {
                                    eol = true;
                                    break;
                              }
                              if (char.IsWhiteSpace (c))
                                    lastWhite = n;
                              col++;
                              n++;
                        }
                        
                        if (lastWhite == -1 || col < maxCols)
                              lastWhite = n;
                        else if (col >= maxCols)
                              n = lastWhite + 1;
                        
                        Console.Write (text.Substring (sn, lastWhite - sn));
                        
                        if (eol || col >= maxCols) {
                              col = -1;
                              Console.WriteLine ();
                              if (eol) n++;
                        }
                  }
            }
            
            void Indent ()
            {
                  ilevel += isize;
                  if (col != -1) {
                        Console.WriteLine ();
                        col = -1;
                  }
            }
            
            void Unindent ()
            {
                  ilevel -= isize;
                  if (ilevel < 0) ilevel = 0;
                  if (col != -1) {
                        Console.WriteLine ();
                        col = -1;
                  }
            }
      }
}

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