Re: Beagle filter for Gentoo ebuilds

[Pat Double <pat patdouble com>]

On Friday 24 March 2006 12:32, Pat Double wrote:
> I've written a filter for Gentoo Linux ebuilds. The main goal is to extract
> information like the title, version, description, etc. It was really easy
> to write. I'd appreciate comments (I'm a Java developer, so I'm sure there
> are some bad things I've done with C# here ;). Any chance this could get
> included in the beagle distribution? How do I go about that, file a bug?

Here's a better version, I'll attach this time. It handles bash line 
continuation and I've changed from using "fixme:title" to "dc:title".

Question, does the filter get instantiated once per beagle process, or for 
every file? I am wondering if I should make the Regex fields static?

-- 
Pat Double, pat patdouble com
"In the beginning God created the heaven and the earth."

//
// FilterEbuild.cs
//
// Copyright (C) 2006 Pat Double <pat patdouble 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;
using System.Text.RegularExpressions;
using Beagle.Daemon;

namespace Beagle.Filters {

	public class FilterEbuild : Beagle.Daemon.Filter {
		Regex METADATA_PATTERN = new Regex("\\s*(?<key>([A-Z_]+))\\s*=\\s*\"(?<value>(.*))\"\\s*");
		Regex EINFO = new Regex("\\s*(einfo|ewarn)\\s+\"(?<message>(.*))\"\\s*");
		Regex PACKAGE = new Regex("(?<name>([^0-9]+))-(?<version>(.+)).ebuild");

		public FilterEbuild ()
		{
			AddSupportedFlavor (FilterFlavor.NewFromExtension (".ebuild"));
			SetVersion(2);
		}

		override protected void DoOpen (FileInfo file)
		{
			Match match = PACKAGE.Match(file.Name);
			String pkgname = match.Groups["name"].ToString();
			if (pkgname.Length > 0) {
				AddProperty (Beagle.Property.New ("dc:title", pkgname));
			}
			
			String version = match.Groups["version"].ToString();
			if (version.Length > 0) {
				AddProperty (Beagle.Property.New ("fixme:version", version));
			}

			StreamReader reader = new StreamReader(new FileStream(file.FullName, FileMode.Open, FileAccess.Read, FileShare.Read));

			string str = null;
			while ((str = reader.ReadLine ()) != null) {
				// Skip comments
				if (str.StartsWith("#"))
					continue;

				// Handle line continuation
				string str2 = null;
				while (str.Trim().EndsWith("\\") && ((str2 = reader.ReadLine ()) != null))
				{
					str = str.Trim();
					if (str.Length == 1)
						str = str2;
					else
						str = str.Substring(0, str.Length - 1) + " " + str2.Trim();
				}

				if (str.Length > 0) {
					// check for meta data
					MatchCollection matches;
					matches = METADATA_PATTERN.Matches (str);
					if (matches.Count > 0) {
						foreach (Match theMatch in matches) {
							String key = theMatch.Groups ["key"].ToString ();
							String value = theMatch.Groups ["value"].ToString ();
							if (key.Equals("DESCRIPTION")) {
								AddProperty (Beagle.Property.New ("dc:description", value));
							}
							else if (key.Equals("LICENSE")) {
								AddProperty (Beagle.Property.New ("dc:rights", value));
							}
							else if (key.Equals("HOMEPAGE")) {
								AddProperty (Beagle.Property.New ("dc:source", value));
							}
						}
					}
					else
					{
						// check for einfo/ewarn
						matches = EINFO.Matches (str);
						if (matches.Count > 0) {
							foreach (Match theMatch in matches) {
								AppendText(theMatch.Groups ["message"].ToString ());
							}
						}
					}
				}
			}
			Finished();
		}
	}
}

Attachment: pgpnkTHtmZg50.pgp
Description: PGP signature