Opening multiple html files & outputting to .txt with Nokogiri - html

Question

Just wondering if these two functions are to be done using Nokogiri or via more basic Ruby commands.
require 'open-uri'
require 'nokogiri'
require "net/http"
require "uri"
doc = Nokogiri.parse(open("example.html"))
doc.xpath("//meta[#name='author' or #name='Author']/#content").each do |metaauth|
puts "Author: #{metaauth}"
end
doc.xpath("//meta[#name='keywords' or #name='Keywords']/#content").each do |metakey|
puts "Keywords: #{metakey}"
end
etc...
Question 1: I'm just trying to parse a directory of .html documents, get the information from the meta html tags, and output the results to a text file if possible. I tried a simple *.html wildcard replacement, but that didn't seem to work (at least not with Nokogiri.parse(open()) maybe it works with ::HTML or ::XML)
Question 2: But more important, is it possible to output all of those meta content outputs into a text file to replace the puts command?
Also forgive me if the code is overly complicated for the simple task being performed, but I'm a little new to Nokogiri / xpath / Ruby.
Thanks.

Answer 1

I have a code similar.
Please refer to:
module MyParser
HTML_FILE_DIR = `your html file dir`
def self.run(options = {})
file_list = Dir.entries(HTML_FILE_DIR).reject { |f| f =~ /^\./ }
result = file_list.map do |file|
html = File.read("#{HTML_FILE_DIR}/#{file}")
doc = Nokogiri::HTML(html)
parse_to_hash(doc)
end
write_csv(result)
end
def self.parse_to_hash(doc)
array = []
array << doc.css(`your select conditons`).first.content
... #add your selector code css or xpath
array
end
def self.write_csv(result)
::CSV.open("`your out put file name`", 'w') do |csv|
result.each { |row| csv << row }
end
end
end
MyParser.run

Answer 2

You can output to a file like so:
File.open('results.txt','w') do |file|
file.puts "output" # See http://ruby-doc.org/core-2.1.2/IO.html#method-i-puts
end
Alternatively, you could do something like:
authors = doc.xpath("//meta[#name='author' or #name='Author']/#content")
keywrds = doc.xpath("//meta[#name='keywords' or #name='Keywords']/#content")
results = authors.map{ |x| "Author: #{x}" }.join("\n") +
keywrds.map{ |x| "Keywords: #{x}" }.join("\n")
File.open('results.txt','w'){ |f| f << results }