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comp.lang.ruby

Find.prune if ( filename[-5,5] != ".java") is odd?

Martin Elzen

4/25/2008 12:29:00 PM


Hi all.

Today I had to do a recursive touch on all Java files in a certain director=
y. Since I recently found that super cool ruby Find example I figured I'd =
use that. However, my first try at a solution didn't work. In the end I j=
ust changed the script a bit and now it does work as intended, but... I re=
ally don't understand why the first version of the example didn't work... =
It's the Ruby 1.8.6 1-click-installer version, if that matters.


require "find"


Find.find( "c:/usd70.senior.2008.04.14.copy" ) do |filename|
Find.prune if filename =3D=3D "."
Find.prune if (filename.size < 6) # shortest interesting filename =3D=3D =
"a.java"

# first try, if I don't comment-out the following line it just does not w=
ork as intended...
#Find.prune if ( filename[-5,5] !=3D ".java") # string doesn't end with "=
java" ?
#`touch #{filename}`


`touch #{filename}` if filename[-5,5] =3D=3D ".java"=20

end
2 Answers

Jason Roelofs

4/25/2008 2:39:00 PM

0

On Fri, Apr 25, 2008 at 8:28 AM, Martin Elzen <martinelzen@hotmail.com> wrote:
>
> Hi all.
>
> Today I had to do a recursive touch on all Java files in a certain directory. Since I recently found that super cool ruby Find example I figured I'd use that. However, my first try at a solution didn't work. In the end I just changed the script a bit and now it does work as intended, but... I really don't understand why the first version of the example didn't work... It's the Ruby 1.8.6 1-click-installer version, if that matters.
>
>
> require "find"
>
>
> Find.find( "c:/usd70.senior.2008.04.14.copy" ) do |filename|
> Find.prune if filename == "."
> Find.prune if (filename.size < 6) # shortest interesting filename == "a.java"
>
> # first try, if I don't comment-out the following line it just does not work as intended...
> #Find.prune if ( filename[-5,5] != ".java") # string doesn't end with ".java" ?
> #`touch #{filename}`
>
>
> `touch #{filename}` if filename[-5,5] == ".java"
>
> end
>
>

What about:

Dir["c:/usd70.senior.2008.04.14.copy/**/*.java"].each { |f| `touch #{f}` }

Jason

Ken Bloom

4/25/2008 3:16:00 PM

0

On Fri, 25 Apr 2008 07:28:42 -0500, Martin Elzen wrote:

> Hi all.
>
> Today I had to do a recursive touch on all Java files in a certain
> directory. Since I recently found that super cool ruby Find example I
> figured I'd use that. However, my first try at a solution didn't work.
> In the end I just changed the script a bit and now it does work as
> intended, but... I really don't understand why the first version of the
> example didn't work... It's the Ruby 1.8.6 1-click-installer version,
> if that matters.
>
>
> require "find"
>
>
> Find.find( "c:/usd70.senior.2008.04.14.copy" ) do |filename|
> Find.prune if filename == "."
> Find.prune if (filename.size < 6) # shortest interesting filename ==
> "a.java"
>
> # first try, if I don't comment-out the following line it just does
> not work as intended... #Find.prune if ( filename[-5,5] != ".java") #
> string doesn't end with "java" ? #`touch #{filename}`
>
>
> `touch #{filename}` if filename[-5,5] == ".java"
>
> end

Find.prune is the wrong tool, period.

Find.find will yield all of the subdirectory names as well, and running
Find.prune on a subdirectory will prevent Find from descending into that
subdirectory (thereby saving time and ignoring its contents). But
Find.prune will *not* jump to the next iteration of the loop. It will
continue to the end of the block before moving on to the next file.

So I think you want
next if ...
instead.



--
Ken (Chanoch) Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu...