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comp.lang.ruby

File::write() complement for File::read() ?

Suraj Kurapati

1/31/2009 5:55:00 AM

Hello,

Why is there not a complementary File::write() method to the
File::read() method? It feels unbalanced to always write the following
code whereas it's so much easier to read a file:

File.open(path, 'wb') {|f| f << content }

I would like to see this method in the core Ruby API, just as the
Symbol#to_proc() facets method has travelled into the core Ruby API.

Thanks for your consideration.
--
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4 Answers

Suraj Kurapati

1/31/2009 8:16:00 AM

0

Allow me to rephrase my question:

It is currently easier to read whole files (via File::read) than to
write whole files (via File::open and passing in a block). This
imbalance can be corrected by adding a File::write method, such as the
following, to the core Ruby API.

def File.write path, data
File.open(path, 'wb') {|f| f << data.to_s }
end

Are there any plans to do this? If not, where can I file a request for
such a change?

Thanks for your consideration.
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Rob Biedenharn

1/31/2009 3:19:00 PM

0


On Jan 31, 2009, at 3:16 AM, Suraj Kurapati wrote:

> Allow me to rephrase my question:
>
> It is currently easier to read whole files (via File::read) than to
> write whole files (via File::open and passing in a block). This
> imbalance can be corrected by adding a File::write method, such as the
> following, to the core Ruby API.
>
> def File.write path, data
> File.open(path, 'wb') {|f| f << data.to_s }
> end
>
> Are there any plans to do this? If not, where can I file a request
> for
> such a change?
>
> Thanks for your consideration.

$ fri File#write
--------------------------------------------------------------- IO#write
ios.write(string) => integer
------------------------------------------------------------------------
Writes the given string to ios. The stream must be opened for
writing. If the argument is not a string, it will be converted to
a string using to_s. Returns the number of bytes written.

count = $stdout.write( "This is a test\n" )
puts "That was #{count} bytes of data"

produces:

This is a test
That was 15 bytes of data


It's already there. Do you ever just try these things? This method
is an instance method.

Your method would be incomplete without a mode. Do you want 'w', 'a',
'wb', etc.?

def your_write(path, data, mode='wb')
File.open(path, mode) {|f| f.write data }
end

I don't know why you call #to_s on data if you open 'wb'. (IO#write
does that for you if what you pass isn't a String.)

-Rob


Rob Biedenharn http://agileconsult...
Rob@AgileConsultingLLC.com
+1 513-295-4739
Skype: rob.biedenharn

Suraj Kurapati

1/31/2009 5:53:00 PM

0

Rob Biedenharn wrote:
> $ fri File#write
> [...]
> It's already there. This method is an instance method.

I asked for a class method File::write (just like File::read) not an
instance method File#write.

> Your method would be incomplete without a mode. Do you want 'w', 'a',
> 'wb', etc.?
>
> def your_write(path, data, mode='wb')
> File.open(path, mode) {|f| f.write data }
> end

Good point.

> I don't know why you call #to_s on data if you open 'wb'. (IO#write
> does that for you if what you pass isn't a String.)

Thanks for the tip.
--
Posted via http://www.ruby-....

Suraj Kurapati

1/31/2009 8:48:00 PM

0

Suraj Kurapati wrote:
> where can I file a request for such a change?

I filed this feature request on Ruby Issue Tracking System:

http://redmine.ruby-lang.org/issues...
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