ruby--ruby/sample/rss/rss_recent.rb

#!/usr/bin/env ruby

require "nkf"
class String
	# From tdiary.rb
	def shorten( len = 120 )
		lines = NKF::nkf( "-e -m0 -f#{len}", self.gsub( /\n/, ' ' ) ).split( /\n/ )
		lines[0].concat( '...' ) if lines[0] and lines[1]
		lines[0]
	end
end

require "rss/parser"
require "rss/1.0"
require "rss/2.0"
require "rss/syndication"
require "rss/dublincore"

items = []
verbose = false

def error(exception)
	mark = "=" * 20
	mark = "#{mark} error #{mark}"
	puts mark
	puts exception.class
	puts exception.message
	puts exception.backtrace
	puts mark
end
before_time = Time.now
ARGV.each do |fname|
	if fname == '-v'
		verbose = true
		next
	end
	rss = nil
	f = File.new(fname).read
	begin
		## do validate parse
		rss = RSS::Parser.parse(f)
	rescue RSS::InvalidRSSError
		error($!) if verbose
		## do non validate parse for invalid RSS 1.0
		begin
			rss = RSS::Parser.parse(f, false)
		rescue RSS::Error
			## invalid RSS.
			error($!) if verbose
		end
	rescue RSS::Error
		error($!) if verbose
	end
	if rss.nil?
		puts "#{fname} does not include RSS 1.0 or 0.9x/2.0"
	else
		begin
			rss.output_encoding = "euc-jp"
		rescue RSS::UnknownConversionMethodError
			error($!) if verbose
		end
		rss.items.each do |item|
			if item.respond_to?(:pubDate) and item.pubDate
				class << item
					alias_method(:dc_date, :pubDate)
				end
			end
			if item.respond_to?(:dc_date) and item.dc_date
				items << [rss.channel, item]
			end
		end
	end
end
processing_time = Time.now - before_time

items.sort do |x, y|
	y[1].dc_date <=> x[1].dc_date
end[0..20].each do |channel, item|
	puts "#{item.dc_date.localtime.iso8601} : " <<
		"#{channel.title} : #{item.title}"
	puts " description : #{item.description.shorten(50)}" if item.description
end

puts "Processing Time : #{processing_time}s"