tov’s Blog

Hmmm… Kleine Fingerübung in Perl (pre-alpha )

Ah ja: Brainfuck: http://lmgtfy.com/?q=Brainfuck

#!/usr/bin/env perl
use Term::ReadKey;
ReadMode 'raw';
my $debug = 0;

my $code;
if ($ARGV[0]){
  { local $/ = undef; local *FILE; open FILE, "<".$ARGV[0]; $code = <FILE>; close FILE }
}

$code ||=
">+++++++++[<+++++++++++++>-]<-.-----.+++++++
.>+++[>++++++++++<-]
>++.<<----.+++.
--------- . -------.>++++[<+++++>-]<+.>++++++++++.";

$code =~ s/[^\.,+-\[\]<>]//msg;
$| = 1;
my @val;
@val[ 0 .. 29999 ] = (0) x 30000;
my $vpt = 0;
my @ls;
my @le;
my $lpt = 0;
my $cc  = 0;
my @c   = split( '', $code );
my $nc  = @c;
while ( $cc < $nc ) {
    $_ = $c[ $cc++ ];
    print "vpt:$vpt \$val[\$vpt]"
      . $val[$vpt]
      . " loop_counter:$loop_counter loop(counter)_start:"
      . $ls[$loop_counter]
      . " loop(counter)_end:"
      . $le[$loop_counter]
      . " cc:$cc command:$_\n"
      if $debug;
    /</ and do { $vpt        and $vpt--; next };
    />/ and do { $vpt < @val and $vpt++; next };
    /\+/ and do { $val[$vpt] = $val[$vpt] + 1; next; };
    /\-/ and do { $val[$vpt] = $val[$vpt] - 1; next; };
    /\./ and do { print chr( $val[$vpt] ); next; };
    /\,/ and do { $val[$vpt] = ord( ReadKey 0 ); next; };
    /\[/ and do {
        if   ( $val[$vpt] ) { $ls[ $lpt++ ] = $cc - 1 }
        else                { $cc = defined $le[$lpt] ? $le[$lpt] : (index($code,']',$cc)+1) }
        next;
    };
    /\]/ and do {
        $le[ --$lpt ] = $cc;
        $cc = $ls[$lpt];
        next;
    };
}
print "\n";

OK, you can find some howto’s everywhere on the web but only on this site I found the complete solution:

class SecondConnection < ActiveRecord::Base

SecondConnection.establish_connection(
:adapter  => "informix",
:host     => "localhost",
:username => "hansnase",
:password => "very_secret",
:database => "ccdb@localhost"
)

self.abstract_class = true
end

“self.abstract_class = true” makes the thing actually work. Otherwise Rails seems to cache the database connection and does not switch back if you access any other classes but SecondConnection.

Yeah!

Later: Not so Yeah…

I had to establish another call to

  ActiveRecord::Base.establish_connection
       logger.info { "Establishing Base Connection" }
       log_connections

I assume it’s either an Informix problem or related to the old rails version I’m driving with.
Nevertheless: It works now.

Obviously I’m in a need of such an installation, otherwise I wouldn’t have googled about this (btw.: Do you know lmgtfy.com).

Here are some snippets from:

1. ChrizDee
2. Craig Ambrose

And? What did I do:

I first enabled Postfix using 1). After this I have changed /etc/aliases:

echo 'rails_mailer: "|/usr/local/bin/mail_handler.rb"' >> /etc/aliases
chmod 755 /usr/local/bin/mail_handler.rb"' >> /etc/aliases
sudo newaliases
sudo postfix reload

#!/usr/bin/ruby
require 'net/http'
require 'uri'Net::HTTP.post_form URI.parse('http://localhost:3000/emails'), { "email" => STDIN.read }

The script above will be triggered by every mail that will be sent to rails_mailer@localhost (resp. your hostname). It will put a post-request to localhost:3000/email including the email in the parameter “email”.

Well: I nearly lost all my hairs about this. Strange that I couldn’t find something like this in the docs.Situation:

I have some XML code from that I need parts being put into a simple hash (see below).

The following small ruby snippet does exactly this.

Only thing that’s not working is the “inner_xml” part. I personally don’t need it but your mileage may vary and you may want to fix the issue (and give me a note)

require 'rubygems'
require 'hpricot'
require 'pp'

text = <<eof
<payment>
		<vat>
			<pay_vat>0</pay_vat>
			<vat_id/>
		</vat>
		<creditcard>
			<type>master</type>
			<holder>Franz Fluchsfinger</holder>
			<company/>
			<no>52660xxxxxxxxxxx79</no>
			<kpn/>
			<valid_until>09/10</valid_until>
			<data>Just some data</data>
			<xml_for_demo><inner_xml>inner text</inner_xml></xml_for_demo>
			<signature>a5f4e2shortened4b1e523ca873837c8f1c9ea66ee1924d</signature>
		</creditcard>
</payment>
eof

xml =Hpricot.XML(text)
a= xml/"creditcard/*"
h={}
a.each {|b|
	h[b.name] = b.inner_text if b.is_a? Hpricot::Elem
}
pp h	

result:

[code]]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[[/code]

Btw.: I found the solution partly on http://railsforum.com/viewtopic.php?id=22055

Some small snippets of Rails/Ruby codes that I’d like to not forget…

I found an interesting site on the Web: http://matthall.wordpress.com/2006/12/06/how-to-execute-a-rails-controller-action-via-cron/ 

Tweaking it a bit:
[code]]czoyMTQ6XCJyZXF1aXJlIFwnLi4vY29uZmlnL2Vudmlyb25tZW50XCcNCnJlcXVpcmUgXCdwcFwnDQppZCA9IEFSR1ZbMF0NCmlmIGlkLm5pe1smKiZdfWw/DQpyYWlzZSAmbHQ7PGVvZj4NClVTQUdFOiAkMCBSRVNFTExFUl9JRA0KZW9mDQplbmQNCmFwcCA9IEFjdGlvbkNvbnRyb2xsZXJ7WyYqJl19OjpJbnRlZ3JhdGlvbjo6U2Vzc2lvbi5uZXcNCmFwcC5nZXQgXCIva3VuZGVuL3N0YXR1c19tYWlsLyN7aWR9XCI8L2VvZj5cIjt7WyYqJl19[[/code]

This works fine from a Rails subdirectory and calls the same action like http://RAILSSITE/kunden/status_mail/ID

GIT? Was’n das?

Git ist ein Versionskontrollsystem, ähnlich wie das bekannte CVS bzw. dessen Nachfolger “Subversion”.
Der große Vorteil von “git” ist die hervorragende Unterstützung von “Branches”, etwas was ich mit CVS/Subversion immer nur ziemlich rudimentär hinbekommen habe.

Hier nun die Installation auf einem älteren SuSE-System:

1) Sourcecode von http://git.or.cz
cd /usr/local/src
aktuell: wget http://kernel.org/pub/software/scm/git/git-1.5.4.4.tar.bz2

2) auspacken
tar xjvpf git-1.5*
cd git-1.5*
./configure
make
make install

It’s that simple

Allerdings: Wenn Ihr mit einem nicht lokalen Repository arbeitet _muss_ die gleiche Prozedur auch auf dem Rechner mit dem Repository stattfinden (also wget, tar, configure, make, make install)
Sonst gibt’s immer ein freundliches:

git clone ssh://user@HOSTNAME/fileserver/git/REPOSITORY
Initialized empty Git repository in /home/jrelease/REPOSITORY/.git/
bash: git-upload-pack: command not found
fatal: The remote end hung up unexpectedly
fetch-pack from ’ssh://user@HOSTNAME/fileserver/git/REPOSITORY’ failed.