DZone Snippets: file code

file extension methods

elliottcable (elliott cable) — Sat, 17 May 2008 02:08:39 GMT

Allows you to use file extensions as methods



class File

  # Feel free to add more here, as you need them.

  Extensions = %r=^(txt|rb|markdown|textile|haml|sass|css|html|xhtml)$=i

  

  module Extension

    def method_missing(meth, *args)

      if Extensions =~ meth.to_s

        [self, '.', meth.to_s].join

      else

        super

      end # if

    end # method_missing

  end # Extension

end # File



class Symbol

  include File::Extension

end

class String

  include File::Extension

end



'myfile'.html

# => "myfile.html"



:a_file.rb

# => "a_file.rb"

perl grep dir and filename

counter202 (jensen) — Wed, 14 May 2008 20:03:25 GMT

// description of your code here



my($directory, $filename) = $text =~ m/(.*\/)(.*)$/;

print "D=$directory, F=$filename\n

Simple File.find

c00lryguy (c00lryguy@gmail.com) — Sat, 03 May 2008 18:56:28 GMT



# Simple File.find by c00lryguy

# Thanks to justinwr for adding what I forgot to do

# ------------------------------

# Usage: 

#     * = wildcard in filename

#   File.find("E:\\") => All files in E:\

#   File.find("E:\\Ruby", "*.rb") => All .rb files in E:\Ruby

#   File.find("E:\\", "*.rb", false) => All .rb files in E:\, but not in its subdirs

class File

  def self.find(dir, filename="*.*", subdirs=true)

    Dir[ subdirs ? File.join(dir.split(/\\/), "**", filename) : File.join(dir.split(/\\/), filename) ]

  end

end

IP Catcher

amer (Amer Jazaerly) — Sat, 26 Apr 2008 08:18:04 GMT

--Howto use--
the command line:
ruby /path/to/ipcatcher.rb /path/to/filename
the program will print all the ip addresses which is inside the file.
the program doesn't print the same ip address twice. with no duplications.
Done by Amer Jazaerly.there is no copyright.
have fun ;)



#!/usr/bin/ruby



def get_ips(file)

  ips = []

  File.read(file).to_a.each do |place|

    sf = 0

    while sfn = place.index(/(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)/,sf)

      sf = sfn + 3

      ips << $&

    end

  end

  return ips

end



get_ips(ARGV[0]).uniq.each { |ip| puts ip }

nginx expires config

indiehead (John) — Fri, 18 Apr 2008 14:12:01 GMT



  location ~* ^.+\.(js|css|php|jpg|jpeg|gif|png|pdf|zip|rar)$ {

    root   /var/www/apps/myapp/public;

    access_log   off;

    expires      7d;

  }

Upload a file using Ajax

jrobertson (James Robertson) — Sat, 23 Feb 2008 14:33:52 GMT

This code is categorised as Ajax because it "fits within my definition of Ajax" as explained from the Ajax File Upload [openjs.com] article.



  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">



  

    File upload

Upload a file using Ruby

jrobertson (James Robertson) — Sat, 23 Feb 2008 13:26:00 GMT

The following code was used to upload an image file to the web server. Source code origin: Ruby Language Stuff | mod_ruby File upload scripts [zytrax.com]

file: file_upload.cgi



#!/usr/bin/ruby



# ruby script fragment

require 'cgi'

require 'stringio'



cgi = CGI.new()  # New CGI object

puts "Content-Type: text/plain"

puts

print ''



# get uri of tx'd file (in tmp normally)

tmpfile = cgi.params['myfile'].first.path



# OR (functionally the same)

tmpfile = cgi.params['myfile'][0].path



# create a Tempfile reference

fromfile = cgi.params['myfile'].first



#displays the original file name as supplied in the form

puts fromfile.original_filename



# displays the content (mime) type e.g. text/html

puts fromfile.content_type



# create output file reference as original filename in our chosen directory

tofile = '/var/www/yourdomain.com/htdocs/r/'+fromfile.original_filename



# copy the file

# note the untaint prevents a security error

# cgi sets up an StringIO object if file < 10240

# or a Tempfile object following works for both

File.open(tofile.untaint, 'w') { |file| file << fromfile.read}

# when the page finishes the Tempfile/StringIO!) thing is deleted automatically



print ''

file: file_upload.html



  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">



  

    File upload

    

  

  

        action='/p/file_upload.cgi' method='post'>

Find all subdirectories of a given path at a particular depth

sikelianos (Zeke Sikelianos) — Wed, 06 Feb 2008 19:25:47 GMT



def subdirectories_of(path, options = {}) depth = options[:at_depth_of] || 1 Dir[File.join(path, * ["*"] * depth + [""])] end >> subdirectories_of("/var") => ["/var/agentx/", "/var/amavis/", "/var/at/", "/var/audit/", "/var/backups/", "/var/db/", "/var/empty/", "/var/folders/", ...] >> subdirectories_of("/var", :at_depth_of => 2) => ["/var/amavis/db/", "/var/amavis/tmp/", "/var/at/jobs/", "/var/at/spool/", "/var/at/tabs/", "/var/at/tmp/",

Ruby: Open a file, write to it, and close it in one line

sikelianos (Zeke Sikelianos) — Tue, 29 Jan 2008 18:42:06 GMT

r - Open a file for reading. The file must exist.
w - Create an empty file for writing. If a file with the same name already exists its content is erased and the file is treated as a new empty file.
a - Append to a file. Writing operations append data at the end of the file. The file is created if it does not exist.
r+ - Open a file for update both reading and writing. The file must exist.
w+ - Create an empty file for both reading and writing. If a file with the same name already exists its content is erased and the file is treated as a new empty file.
a+ - Open a file for reading and appending. All writing operations are performed at the end of the file, protecting the previous content to be overwritten. You can reposition (fseek, rewind) the internal pointer to anywhere in the file for reading, but writing operations will move it back to the end of file. The file is created if it does not exist.



File.open(local_filename, 'w') {|f| f.write(doc) }

Java filecopy using NIO

frost137 (Douglas Wyatt) — Fri, 04 Jan 2008 22:40:01 GMT



    public static void fileCopy( File in, File out )

            throws IOException

    {

        FileChannel inChannel = new FileInputStream( in ).getChannel();

        FileChannel outChannel = new FileOutputStream( out ).getChannel();

        try

        {

//          inChannel.transferTo(0, inChannel.size(), outChannel);      // original -- apparently has trouble copying large files on Windows



            // magic number for Windows, 64Mb - 32Kb)

            int maxCount = (64 * 1024 * 1024) - (32 * 1024);

            long size = inChannel.size();

            long position = 0;

            while ( position < size )

            {

               position += inChannel.transferTo( position, maxCount, outChannel );

            }

        }

        finally

        {

            if ( inChannel != null )

            {

               inChannel.close();

            }

            if ( outChannel != null )

            {

                outChannel.close();

            }

        }

    }