Inital Deb Filter

[Kevin Kubasik <kevin kubasik net>]

Let me know what you all think. This is my first shot, hope it works
out. I looked into using one of Mono's decompression libs to extract the
actual description information, but .deb's are in the somewhat obscure
ar archive format. So dpkg-deb it was. If anyone can think of a property
I missed, please let me know, they are quite easy to add. 

Also, is there a major objection to just adding the Description field as
text? and furthermore, is it ok that this happens in DoPullProperties()?
as opposed to DoPull()? 


-- 
Cheers,
Kevin Kubasik <kevin kubasik net>
http://blog.kubasik.net

using System;
using System.IO;
using System.Diagnostics;

using Beagle.Daemon;
using Beagle.Util;

namespace Beagle.Filters{
	public class FilterDeb : Beagle.Daemon.Filter {
	
	public FilterDeb (){
		AddSupportedFlavor (FilterFlavor.NewFromMimeType ("application/x-deb"));
		AddSupportedFlavor (FilterFlavor.NewFromExtension(".deb") );
	}
	
	protected override void DoPullProperties (){
			Process pc = new Process ();
			pc.StartInfo.FileName = "dpkg-deb";
			pc.StartInfo.Arguments = " -I "+ FileInfo.FullName ;
			pc.StartInfo.RedirectStandardInput = false;
			pc.StartInfo.RedirectStandardOutput = true;
			pc.StartInfo.RedirectStandardError = true;
			pc.StartInfo.UseShellExecute = false;
			
			try {
				pc.Start ();
			} catch (System.ComponentModel.Win32Exception) {
				Log.Warn ("Error: 'dpkg-deb' command not found or unable to run");
				Error ();
				return;
			}

			StreamReader pout = pc.StandardOutput;
			string str = null;
			string[] tokens = null;
			string strMetaTag = null;
			bool bKeyword = false;
			bool listWords = false;
			char[] splits = {',','|'};
			string[] list = null;
			while ((str = pout.ReadLine ()) != null) {
				bKeyword = false;
				listWords = false;
				strMetaTag = null;
				tokens = str.Split (':');
				if (tokens.Length > 1) {
					switch (tokens[0].Trim()) {
					case "Package":
						strMetaTag = "dc:title";
						break;
					case "Maintainer":
						strMetaTag = "dc:author";
						break;
					case "Version":
						strMetaTag = "fixme:version";
						bKeyword = true;
						break;
					case "Section":
						strMetaTag = "fixme:section";
						bKeyword = true;
						break;
					case "Architecture":
						strMetaTag = "fixme:arch";
						bKeyword = true;
						break;
					case "Depends":
						listWords = true;
						list = tokens[1].Split(splits);
						foreach(string s in list){
							AddProperty (Beagle.Property.NewKeyword ("fixme:dep", 
												 s.Trim()));
						}
						break;
					case "Recommends":
						listWords = true;
						list = tokens[1].Split(splits);
						foreach(string s in list){
							AddProperty (Beagle.Property.NewKeyword ("fixme:recommend", 
												 s.Trim()));
						}
						break;
					case "Conflicts":
						listWords = true;
						list = tokens[1].Split(splits);
						foreach(string s in list){
							AddProperty (Beagle.Property.NewKeyword ("fixme:conflict", 
												 s.Trim()));
						}
						break;
					case "Replaces":
						listWords = true;
						list = tokens[1].Split(splits);
						foreach(string s in list){
							AddProperty (Beagle.Property.NewKeyword ("fixme:replace", 
												 s.Trim()));
						}
						break;
					case "Provides":
						listWords = true;
						list = tokens[1].Split(splits);
						foreach(string s in list){
							AddProperty (Beagle.Property.NewKeyword ("fixme:provide", 
												 s.Trim()));
						}
						break;
					case "Installed-Size":
						strMetaTag = "fixme:size";
						bKeyword= true;
						break;
					case "Description":
						listWords=true;
						AppendText(tokens[1]);
						AppendStructuralBreak ();
						while ((str = pout.ReadLine ()) != null) {
							if(str.Trim()==".")
								AppendStructuralBreak();
							else
								AppendText(str);
						}
						break;
					}
					if (strMetaTag != null) {
						if(!listWords){
							if (bKeyword){
								AddProperty (Beagle.Property.NewKeyword (strMetaTag, 
													 tokens[1].Trim()));
							}
							else{
								AddProperty (Beagle.Property.New (strMetaTag, 
											  		tokens[1].Trim()));
							}
						}
					}
				}
			}
			pout.Close ();
			pc.WaitForExit ();
			pc.Close ();
			Finished ();
		}
	
	}

}