From: Duane Johnson <duane.johnson@...>
Date: 2006-01-10T11:13:18+09:00
Subject: Re: Rio 0.3.7


On Jan 9, 2006, at 4:38 PM, rio4ruby wrote:

> Duane Johnson wrote:
>>> Copy a gzipped file un-gzipping it
>>>  rio('afile.gz').gzip > rio('afile')
>>>
>> Why does 'gzip' unzip?  How would one zip something up?
>
> Rio#gzip puts a Rio in gzip mode, so the referenced
> file will be read from and written to properly. We could
> rewrite the example:
>
>  a_rio_referencing_a_gzipped_file = rio('afile.gz).gzip
>  a_rio_referencing_a_file = rio('afile')
>  a_rio_referencing_a_gzipped_file > a_rio_referencing_a_file
>
>> How would one zip something up?
>
> Turn the arrow around:
>  rio('afile.gz').gzip < rio('afile')
>
>> Curious... why does +all+ take square brackets when +files+ uses
>> parens?  Seems inconsistent upon first viewing.
>
> Both +files+ and +all+ are configuration methods.
>
> The usage:
>
>   anarray = rio('adir').all['*.rb']
>
> is syntactic sugar for
>
>   anarray = rio('adir').all.entries('*.rb').to_a
>
> The abbreviated usage works because:
>   1. Rio#entries is the default selection method when iterating
>      over directories.
>   2. The subscript operator passes its arguments to the most
>      recently called selection method (in this case +entries+,
>      even though it was never *explicitly* called) before it
>      calls +to_a+.
>   3. Rio#all returns the Rio which called it. (All configuration
>      methods do this, to support the readable shortened syntax)
>
> Since Rio#files is also a configuration method, it can be used
> similarly:
>
>   rio('adir').files('*.rb') { |f| ... } # iterate over .rb files
>   rio('adir').files['*.rb']             # returns an array of .rb  
> files
>   rio('adir').files('*.rb') > 'bdir'    # copies .rb files to 'bdir'
>
> Hope this helps.
> -Christopher
>

Fantastic!  Thanks again.  I'm loving Rio more and more :)

Duane Johnson
(canadaduane)
http://blog.inquirylabs.com/