From: Peter Miller <feurry@...>
Date: 2010-04-10T07:25:01+09:00
Subject: Re: read and write stock prices to file using arrays

well, I just got home from work and was going to hack away.. but instead 
i cut n paste and got a working script after a couple minor edits. 
Thanks so much for such a complete solution. I wasn't expecting that!

Here is the working code in full. It handles my file perfectly.

require 'rubygems'
require 'yahoofinance'

quote_type = YahooFinance::StandardQuote

filename = ARGV[0]

TickerData = Struct.new :symbol, :file_position, :name, :last_trade

lines = File.readlines(filename)
tickers = {}
lines.each_with_index do |line, i|
  next if line =~ /^#/         # skip comments
  next if line.chomp.empty?    # skip empty lines
  symbol = line[/\w+/].upcase
  tickers[symbol] = TickerData.new symbol, i #store the symbol and file 
position
end

YahooFinance.get_quotes( quote_type, tickers.keys ) do |qt|
  next unless tickers[qt.symbol]
  tickers[qt.symbol].name = qt.name
  tickers[qt.symbol].last_trade = qt.lastTrade
end

tickers.each do |symbol, ticker|
  lines[ticker.file_position] = "#{ticker.symbol} #{ticker.name} 
#{ticker.last_trade}\n"
end

File.open(filename, "w") {|file| file.puts lines.join}

Off to do some reading on structs
Thanks Martin and Jesus
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