support newsgroup cache for subjects and ids

trunk/ripnews/news/article.rb

@@ -29,10 +29,12 @@ def add(messid, id, subject)
 	@grouped = false
 end
 
-def get_articles(group)
+def get_articles(group, cachedir=false)
+	if cachedir
+		read_cache(group, cachedir)
+	end
 	resp, count, first, last,name = @nntp.group(group)
 	range = Set::IntSpan.new("#{first}-#{last}")
-#	for i in (first.to_i..last.to_i)
 	for i in (range.diff(@skip_ids).elements)
 		begin
 			@nntp.stat(i)
@@ -50,6 +52,9 @@ def get_articles(group)
 			print "whoopsie couldn't stat #{i}\n" if Debuglevel > 1
 		end
 	end
+	if cachedir
+		save_cache(group, cachedir)
+	end
 end
 
 def get_groups
@@ -158,6 +163,37 @@ def set_skip_ids(ids)
 	return true
 end
 
+def read_cache(group, cachedir)
+	filename = "#{cachedir}/#{group}.ripnewscache"
+	if FileTest.directory?( cachedir) and FileTest.file?( filename ) and FileTest.readable?( filename )
+		file = File.new( filename )
+		lines = file.readlines
+		for line in lines
+			#print "line: #{line}\n"
+			if line =~ /^(.*?)\|(\d+)\|(.*)$/
+				#print "messid:  #{$1}\n"
+				#print "id:      #{$2}\n"
+				#print "subject: #{$3}\n"
+				add($1, $2, $3)
+				@skip_ids.insert($2.to_i)
+			end
+		end
+	end
+end
+
+def save_cache(group, cachedir)
+	filename = "#{cachedir}/#{group}.ripnewscache"
+	if FileTest.directory?( cachedir)
+		file = File.new( filename, "w" ) or print "couldn't open cachefile for writing\n"
+		for i in (0...@subjects.length)
+			file.print("#{@messids[i]}|#{@ids[i]}|#{@subjects[i]}\n")
+			#print "writing: #{@messids[i]}|#{@ids[i]}|#{@subjects[i]}\n" 
+		end
+	end
+end
+
+#######################################################################
+
 def uudecode(data, outfile=nil)
 	case data.type.to_s
 		when "Array"