DZone Snippets: gentoo code

Generate a graph using Gruff

jrobertson (James Robertson) — Sun, 24 Feb 2008 18:52:14 GMT

This Ruby code produced a graph using gruff. The output shows a line graph [twitxr.com] for the different fruits. Source code origin: Gruff Update With Bar Graphs | Ruby on Rails for Newbies [rubyonrails.com]



require 'gruff'



g = Gruff::Line.new

g.title = "My Graph" 



g.data("Apples", [1, 2, 3, 4, 4, 3])

g.data("Oranges", [4, 8, 7, 9, 8, 9])

g.data("Watermelon", [2, 3, 1, 5, 6, 8])

g.data("Peaches", [9, 9, 10, 8, 7, 9])



g.labels = {0 => '2003', 2 => '2004', 4 => '2005'}



g.write('my_fruity_graph.png')

Note: I executed the code within an irb session on my Gentoo box. With Gentoo, Gruff was installed [gentoo-portage.com] using the command emerge -va gruff. I tried installing it on Ubuntu but ran into some difficulty, even with help from the article install rmagick ubuntu [dzone.com].

*udpate 21:48 24-Feb*

The following code does exactly as the same code above, however it uses XML to separate the data from the process, making it easier and more efficient to build graphs.



#!/usr/bin/ruby

# file: xml2gruff.rb



require 'rexml/document'

require 'gruff'

include REXML



class Xml2Gruff

  

  def initialize(filename)

    file = File.new(filename, 'r')

    doc = Document.new(file)

    # get the title

    @title = doc.root.elements['summary/title'].text

    

    @record = Hash.new

    # get each record

    doc.root.elements.each('records/item') {|item|

      avalues = Array.new

      item.elements.each('values/value') { |value| avalues << value.text.to_i }

      @record[item.elements['label'].text] = avalues

    }

    

    # get the summary labels

    @labels = Hash.new  

    doc.root.elements.each('summary/scale/label') {|l| @labels[l.elements['value'].text.to_i] = l.elements['title'].text} 

    

  end

  

  def save_line_graph(filename)



    g = Gruff::Line.new

    g.title = @title 

    @record.each {|label, data| g.data(label, data) }

    g.labels = @labels

    g.write(filename)



  end

end



if __FILE__ == $0

 x2g = Xml2Gruff.new('my_fruit.xml')

 x2g.save_line_graph('my_fruit2.png')

end

file: my_fruit.xml

Reference: gruff's gruff-0.2.9 Documentation [rubyforge.org]
gruff graphs for ruby by geoffrey grosenbach [topfunky.com]

Subversion basic commands Part I

jrobertson (James Robertson) — Tue, 23 Oct 2007 11:37:57 GMT

New users to SVN should be familiar with the following commands. Examples based on the code from Gentoo-wiki - HOWTO subversion SVN http://urltea.com/1urj .



#server side



# create the project directory structure outside of svn

mkdir -p ~/Documents/code/my-project/{trunk,tags,branches} 



# create the new repository

svnadmin create /var/svn/my-repository 



# add the new project

svn import my-project file:////var/svn/my-repository/my-project



# remove the project

rm -rf /var/svn/my-repository/my-project 





#client side



# list the contents of my-project

svn list --verbose http://my-site.com/svn/my-repository/my-project 





# *update 29-Oct-07*

# it's possible to import, or remove the project from the client-side



# add the new project

svn import my-project http://my-site.com/svn/my-repository/my-project 



# remove the project

svn delete http://my-site.com/svn/my-repository/my-project

Note: To use http on the client side, it's necessary to have Apache configured using SVN and DAV. Refer to HOWTO Apache2 with subversion SVN and DAV. http://urltea.com/1uqg

bash script for cleaning distfiles in gentoo

zerrez (Johan Brinch) — Mon, 09 Apr 2007 19:00:16 GMT

Bash script for cleaning /usr/distfiles in gentoo.
Usually this folder is located in /usr/portage/distfiles, but i moved it ;)
The script will delete every file, that has not been accessed in 90 days,
without deleting my wifi-driver (ipw3945).



#!/bin/bash



for i in \

`find /usr/distfiles -maxdepth 1 -atime +90 \

| grep -Ev "/usr/distfiles/\..*" \

| grep -v "ipw3945"` \

; do

    if [ -f $i ]; then

        rm $i; 

    fi 

done

Update Gentoo System Packages

Lucius-Agrippa (Lucius Agrippa) — Thu, 08 Dec 2005 00:43:36 GMT

emerge -Upv system