From: James Edward Gray II <james@...>
Date: 2010-07-01T23:14:37+09:00
Subject: Re: Reading String Data as a File

On Jul 1, 2010, at 4:02 AM, Robert Klemme wrote:

> 2010/7/1 James Edward Gray II <james@graysoftinc.com>:
>> On Jun 30, 2010, at 10:41 AM, Brian Candler wrote:
>> 
>>> James Edward Gray II wrote:
>>>> I'm open to suggestions and I do take patches.
>>> 
>>> Specifically, I'd like to see how to parse CSV from stdin. You provide
>>> an example in the opposite direction:
>>> 
>>> #   FCSV($stderr)    { |csv_err| csv_err << %w{my data here} }  # to
>>> $stderr
>> 
>> On Jun 30, 2010, at 11:35 AM, Robert Klemme wrote:
>> 
>>> On 30.06.2010 17:05, James Edward Gray II wrote:
>>>> 
>>>> Do you think it would help if I added Wrapping an IO under the
>>>> Shortcut Interface on this page?
>>>> 
>>>> http://fastercsv.rubyforge.org/classes/FasterCSV.html
>>> 
>>> +1
>> 
>> Better?
>> 
>> http://fastercsv.rubyforge.org/classes/FasterCSV.html
> 
> Perfect!  Do you think it is a good idea to also allow an IO as
> argument to foreach so we can save a block?
> 
> FCSV($stdin)     { |csv_in|  csv_in.each { |row| p row } }  # from $stdin
> 
> would become
> 
> FCSV.foreach($stdin)     { |row| p row }  # from $stdin

I would rather not go that far.  The standard CSV library for Ruby 1.8 varied its interface slightly from the IO methods I assumed it meant to imitate.  For example, open() was essentially foreach() when you passed an "r" mode.  This always bothered me.

We don't need two blocks though.  I showed it that way in the documentation for consistency (to hopefully make it easier to remember), but this works:

$ echo -e 'a,b,c' | ruby -rubygems -e 'require "faster_csv"; FCSV($stdin).each { |row| p row }'
["a", "b", "c"]

James Edward Gray II