From: Peter Miller <feurry@...>
Date: 2010-04-09T09:34:11+09:00
Subject: read and write stock prices to file using arrays

I'm trying to write a script that will take stock ticker symbols from a
file, pull the company name and current price and write it back to the
file while ignoring comments and blank lines so as to leave the rest of
the file intact.

I can get the stock prices etc. i'm after using the yahoofinance module
http://www.transparentech.com/opensource/yahoofinance
like so

require 'rubygems'
require 'yahoofinance'

quote_type = YahooFinance::StandardQuote

# Set the symbols for which we want to retrieve quotes.
quote_symbols = ['yhoo','goog']

# Get the quotes from Yahoo! Finance.  The get_quotes method call
# returns a Hash containing one quote object of type "quote_type" for
# each symbol in "quote_symbols".  If a block is given, it will be
# called with the quote object (as in the example below).
YahooFinance.get_quotes( quote_type, quote_symbols ) do |qt|
  puts "QUOTING: #{qt.symbol}"
  puts "#{qt.name}"
  puts "#{qt.lastTrade}"
end

I want to create an array of ticker symbols like quote_symbols above,
but from a file.

here's a test data file i'm using
# this is the comment line

# that was a blank, below is a stock
YHOO
GOOG # this comment can be deleted

i would like the output to look like
# this is the comment line

# that was a blank, below is a stock
YHOO:Yahoo! Inc.:17.35
GOOG:Google Inc.:567.49

this is the code i'm having trouble with.
filename = ARGV[0]

File.open(filename, 'r+') do |f|
  lines = f.readlines            # load array of lines
  lines.each do |line|
    next if line =~ /^#/         # skip comments
    next if line.chomp.empty?    # skip empty lines
    $ticker[lines] = line        #***the problem
    puts lines.index(line)
  end
end

$ticker.each do |p|
  puts "#{p}"
end

*** I'm trying to create the array $ticker that has all my stocks so i
can pass it on to the yahoofinance module.

The other stumbling block for me is how to keep the results of YHOO ->
Yahoo! Inc. and the price 17.35 matched up with YHOO so i can put it
back on the same line.

Thanks
Peter
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