DZone Snippets: Sikelianos's Code Snippets

Ruby method to determine if a string would look more readable on black vs. white.

sikelianos (Zeke Sikelianos) — Fri, 02 May 2008 20:41:56 GMT

// description of your code here



def self.ideal_font_color_for(hex_str)

	hex_str = hex_str.split('#').last



	threshold = 105



	r = hex_str[0..1].hex

	g = hex_str[2..3].hex

	b = hex_str[4..5].hex



	delta = (r*0.299) + (g*0.587) + (b*0.114)



	255 - delta < threshold ? "#000000" : "#FFFFFF"

end

Sort last 1000 shell commands by popularity

sikelianos (Zeke Sikelianos) — Tue, 22 Apr 2008 04:16:17 GMT



  history 1000 | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head

Bashy Perlness for generating Favicon text for OpenSearches

sikelianos (Zeke Sikelianos) — Mon, 21 Apr 2008 19:58:49 GMT



echo -n 'data:image/xicon,' ; perl -ne 's/(.)/"%".unpack("H2",$1)/egs; print' ~/Desktop/favicon.ico ; echo ''

Ruby: Escape, Unescape, Encode, Decode, HTML, XML, URI, URL

sikelianos (Zeke Sikelianos) — Tue, 26 Feb 2008 23:23:08 GMT

This example will show you how to escape and un-escape a value to be included in a URI and within HTML.



require 'cgi'



# escape

name = "ruby?"

value = "yes"

url = "http://example.com/?" + CGI.escape(name) + '=' + CGI.escape(value) + "&var=T"

# url: http://example.com/?ruby%3F=yes&var=T

html = %(example)

# html: example



# unescape

name_encoded = html.match(/http:([^"]+)/)[0]

# name_encoded: http://example.com/?ruby%3F=yes&var=T

href = CGI.unescapeHTML(name_encoded)

# href: http://example.com/?ruby%3F=yes&var=T

query = href.match(/\?(.*)$/)[1]

# query: ruby%3F=yes&var=T

pairs = query.split('&')

# pairs: ["ruby%3F=yes", "var=T"]

name, value = pairs[0].split('=').map{|v| CGI.unescape(v)}

# name, value: ["ruby?", "yes"]

Single-Line commenting in Actionscript with Textmate

sikelianos (Zeke Sikelianos) — Sun, 24 Feb 2008 22:49:14 GMT

- open the bundle editor and select the Actionscript bundle
- use the add button to make a new preference item, give it a scope of source.actionscript
- name it whatever
- paste in the following:



{   shellVariables = (

        {   name = 'TM_COMMENT_START';

            value = '// ';

        },

    );

}

- that's it! got these instructions on IRC from Infininight: http://pastie.textmate.org/private/clmfldbv2sexjcd7u6qjw

AS3 FlashVars equivalent: LoaderInfo

sikelianos (Zeke Sikelianos) — Wed, 13 Feb 2008 18:25:17 GMT

// Add this to your package..
import flash.text.*;

// And throw this in wherever..
var t:TextField = new TextField();
t.autoSize = TextFieldAutoSize.LEFT;
t.border = true;
addChild(t);

t.appendText("params:" + "\n");
try {
var key:String;
var val:String;
var flashvars:Object = LoaderInfo(this.root.loaderInfo).parameters;
for (key in flashvars) {
val = String(flashvars[key]);
t.appendText("\t" + key + ":\t" + val + "\n");
}
} catch (error:Error) {
t.appendText(error);
}

Make AS3 clips turn cursor into a hand on rollover..

sikelianos (Zeke Sikelianos) — Mon, 11 Feb 2008 07:11:23 GMT



  buttonMode = true; 

  mouseChildren = false;

AS3 SwapDepths Equivalent

sikelianos (Zeke Sikelianos) — Mon, 11 Feb 2008 06:30:34 GMT



function move_to_top() {

  // This will move the current object to the topmost z-index

  parent.setChildIndex(this, parent.numChildren-1);

}

Ruby word count

sikelianos (Zeke Sikelianos) — Wed, 06 Feb 2008 19:29:34 GMT



module StringExtensions

  def words

    s = self.dup

    s.gsub!(/\w+/, 'X')

    s.gsub!(/\W+/, '')

    s.length

  end

end

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/",