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comp.lang.ruby

File fun! How would you...

Casimir

11/21/2007 3:00:00 PM

....index in a hash...
....all directories under 'src'...
....that contain filetypes in 'ft[]'...
....without getting lost in arrays inside arrays..

#Here is my try
src="/"
tmpindex = []
filetypes = [".jpg", ".png", ".gif", ".bmp"]
filetypes.each { |typ| tmpindex << Dir[src+"**/*"+typ] }

index={}
tmpindex.each { |fpath|
dirpath = File.dirname(File.expand_path(fpath.to_s))
index[dirpath] = File.basename(fpath.to_s)
}
puts index
#bleed
#end
4 Answers

yermej

11/21/2007 3:22:00 PM

0

On Nov 21, 9:00 am, Casimir <pikEISPAMMMs...@welho.com> wrote:
> ...index in a hash...
> ...all directories under 'src'...
> ...that contain filetypes in 'ft[]'...
> ...without getting lost in arrays inside arrays..
>
> #Here is my try
> src="/"
> tmpindex = []
> filetypes = [".jpg", ".png", ".gif", ".bmp"]

require 'find'

src = "/"
index = []
filetypes = [".jpg", ".png", ".gif", ".bmp"]

Find.find(src) do |path|
index << path if filetypes.include? File.extname(path)
end

Robert Klemme

11/21/2007 6:36:00 PM

0

On 21.11.2007 16:00, Casimir wrote:
> ...index in a hash...
> ...all directories under 'src'...
> ...that contain filetypes in 'ft[]'...
> ...without getting lost in arrays inside arrays..
>
> #Here is my try
> src="/"
> tmpindex = []
> filetypes = [".jpg", ".png", ".gif", ".bmp"]
> filetypes.each { |typ| tmpindex << Dir[src+"**/*"+typ] }
>
> index={}
> tmpindex.each { |fpath|
> dirpath = File.dirname(File.expand_path(fpath.to_s))
> index[dirpath] = File.basename(fpath.to_s)
> }
> puts index
> #bleed
> #end

Are you sure you want to remember only one file per directory? If not:

EXTENSIONS = %w{jpg png gif bmp}

index = Hash.new {|h,k| h[k]=[]}

Dir["**/*.{#{EXTENSIONS.join(',')}}"].each do |f|
dir, base = File.split f
index[dir] << base
end

And, for the record, the solution with #inject:

EXTENSIONS = %w{jpg png gif bmp}

index = Dir["**/*.{#{EXTENSIONS.join(',')}}"].inject(
Hash.new {|h,k| h[k]=[]}) do |h,f|
dir, base = File.split f
h[dir] << base
h
end

Cheers

robert

Casimir

11/22/2007 8:30:00 AM

0

Thanks for replies yermej and Robert! I learn some new agin! IT's easy! 8)

More comments further down the post... And questions.

> On Nov 21, 9:00 am, Casimir <pikEISPAMMMs...@welho.com> wrote:
>> ...index in a hash...
>> ...all directories under 'src'...
>> [snip!]

yermej wrote this solution:
> require 'find'
>
> src = "/"
> index = []
> filetypes = [".jpg", ".png", ".gif", ".bmp"]
>
> Find.find(src) do |path|
> index << path if filetypes.include? File.extname(path)
> end

Well it works great but the results are in an array and would require
further processing before files would be in an hash... with path as keys
(which my orig post didn't specify though).

Robert Klemme wrote:

> EXTENSIONS = %w{jpg png gif bmp}
>
> index = Hash.new {|h,k| h[k]=[]}
>
> Dir["**/*.{#{EXTENSIONS.join(',')}}"].each do |f|
> dir, base = File.split f
> index[dir] << base
> end

Wow. That is snappy.

I, too, was annoyed when I couldnt assign stuff into the Hash with <<.

I dont know why. It has more characters than "arr[key]=val". You could
save almost 2 lines with the = version. It looks better I guess. I
couldnt bend ruby like that tho, over. Haha!

I also like how you handle the assignment of the split file path with
"dir, base = File.split f".

And I have no idea what the {#{EXTENSIONS.join(',')}} is all about! IRB
just gave me *'s.

lol I am just a dummy! Hahaha!

yermej

11/22/2007 4:11:00 PM

0

On Nov 22, 2:30 am, Casimir <pikEISPAMMMs...@welho.com> wrote:
> Thanks for replies yermej and Robert! I learn some new agin! IT's easy! 8)
>
> More comments further down the post... And questions.
>
> > On Nov 21, 9:00 am, Casimir <pikEISPAMMMs...@welho.com> wrote:
> >> ...index in a hash...
>
> >> ...all directories under 'src'...
>
> >> [snip!]
>
> yermej wrote this solution:
>
> > require 'find'
>
> > src = "/"
> > index = []
> > filetypes = [".jpg", ".png", ".gif", ".bmp"]
>
> > Find.find(src) do |path|
> > index << path if filetypes.include? File.extname(path)
> > end
>
> Well it works great but the results are in an array and would require
> further processing before files would be in an hash... with path as keys
> (which my orig post didn't specify though).

Sorry, missed the hash part. Borrowing from Robert's solution:

require 'find'

src = '/'
filetypes = [".jpg", ".png", ".gif", ".bmp"]
index = Hash.new {|h, k| h[k] = []}

Find.find(src) do |path|
next unless filetypes.include? File.extname(path)
dir, base = File.split path
index[dir] << base
end

Jeremy