[lnkForumImage]
TotalShareware - Download Free Software
Confronta i prezzi di migliaia di prodotti.
Asp Forum
 Home | Login | Register | Search 


 

Forums >

comp.lang.ruby

glob on a dir object

ruby newbie

4/23/2007 11:29:00 PM

Hi

I am a Ruby newbie and having fun learning it so far...Can anyone help
me as to why this does not work?

Why does not glob method work on a Directory object created or am I
not using the OO constrcuts the right way?

irb(main):001:0> dh = Dir.new("/tmp/zz")
=> #<Dir:0x64018>
irb(main):002:0> dh.each { |f| puts "Has file #{f}" }
Has file .
Has file ..
Has file a
Has file aa
Has file b
Has file c
Has file d
=> #<Dir:0x64018>

irb(main):003:0> arr = dh.glob("a?")
NoMethodError: undefined method `glob' for #<Dir:0x64018>
from (irb):3

Thanks!
VS
4 Answers

Harold Hausman

4/24/2007 12:46:00 AM

0

On 4/24/07, ruby newbie <vigneshsriniv@gmail.com> wrote:
> Hi
>
> I am a Ruby newbie and having fun learning it so far...Can anyone help
> me as to why this does not work?
>
> Why does not glob method work on a Directory object created or am I
> not using the OO constrcuts the right way?
>

Right.

The glob method is only available on the Dir class. Observe:
C:\>ri Dir#glob
Nothing known about Dir#glob

C:\>ri Dir::glob
-------------------------------------------------------------- Dir::glob
Dir.glob( string, [flags] ) => array
Dir.glob( string, [flags] ) {| filename | block } => nil
------------------------------------------------------------------------
Returns the filenames found by expanding the pattern given in
_string_, either as an _array_ or as parameters to the block. Note
that this pattern is not a regexp (it's closer to a shell glob).
See +File::fnmatch+ for the meaning of the _flags_ parameter.
...


hth,
-Harold

Jesse Merriman

4/24/2007 1:00:00 AM

0

On Monday 23 April 2007 19:29, ruby newbie wrote:
> Why does not glob method work on a Directory object created or am I
> not using the OO constrcuts the right way?

glob is a class method of Dir, not an instance method.

irb(main):002:0> Dir::glob('/tmp/zz/a?')
=> ["/tmp/zz/aa"]

If you run 'ri Dir' from the command-line, you can see glob appears under
'Class methods'. Running 'ri Dir::glob' gives example usage. glob returns
an array of strings, but if you want Files, you can do this:

irb(main):007:0> Dir::glob('/tmp/zz/a*').map { |f| File.new f }
=> [#<File:/tmp/zz/a>, #<File:/tmp/zz/aa>]

(though perhaps there's a better way; I haven't done too much with Dir/File
myself..)


--
Jesse Merriman
jessemerriman@warpmail.net
http://www.jessemer...

ruby Newbie

4/24/2007 3:58:00 AM

0

ahh, That makes sense now. I get :: and # syntax that I saw in
Pragmatic programmer's guide .Thank you Harold & Jesse.

On Apr 23, 8:59 pm, Jesse Merriman <jesse.d.merri...@gmail.com> wrote:
> On Monday 23 April 2007 19:29, ruby newbie wrote:
>
> > Why does not glob method work on a Directory object created or am I
> > not using the OO constrcuts the right way?
>
> glob is a class method of Dir, not an instance method.
>
> irb(main):002:0> Dir::glob('/tmp/zz/a?')
> => ["/tmp/zz/aa"]
>
> If you run 'ri Dir' from the command-line, you can see glob appears under
> 'Class methods'. Running 'ri Dir::glob' gives example usage. glob returns
> an array of strings, but if you want Files, you can do this:
>
> irb(main):007:0> Dir::glob('/tmp/zz/a*').map { |f| File.new f }
> => [#<File:/tmp/zz/a>, #<File:/tmp/zz/aa>]
>
> (though perhaps there's a better way; I haven't done too much with Dir/File
> myself..)
>
> --
> Jesse Merriman
> jessemerri...@warpmail.nethttp://www.jessemer...

come

4/24/2007 7:48:00 AM

0

Hi,

Indeed, "glob" is a classe methods of "Dir" but since Dir is a child
of Enumerable module, you have access to all instance methods of
Enumerable module like, for instance : grep.

So :
dh.grep(/^a?/)

....should play the same role as the glob class method

On 24 avr, 05:58, ruby Newbie <vsrin...@gmail.com> wrote:
> ahh, That makes sense now. I get :: and # syntax that I saw in
> Pragmatic programmer's guide .Thank you Harold & Jesse.
>