jctosta

Screen Quick Reference

Basic

Description	Command
Start a new session with session name	screen -S <session_name>
List running sessions / screens	screen -ls
Attach to a running session	screen -x
Attach to a running session with name	screen -r

peterdalle

# Disallow everything.
User-agent: *
Disallow: /

# Certain social media sites are whitelisted to allow crawlers to access page markup when links to /images are shared. 
User-agent: Twitterbot
Allow: /images

User-agent: facebookexternalhit
Allow: /images

chriseppstein

Sass/Less Comparison

In this document I am using Sass's SCSS syntax. You can choose to use the indented syntax in sass, if you prefer it, it has no functional differences from the SCSS syntax.

For Less, I'm using the JavaScript version because this is what they suggest on the website. The ruby version may be different.

Variables

dhh

class ActionDispatch::Routing::Mapper
  def draw(routes_name)
    instance_eval(File.read(Rails.root.join("config/routes/#{routes_name}.rb")))
  end
end

BCX::Application.routes.draw do
  draw :api
  draw :account
  draw :session

calavera

require 'securerandom'

class NameGenerator
  LEFT = [
    "admiring",
    "adoring",
    "affectionate",
    "agitated",
    "amazing",
    "angry",

njvitto

#Deploy and rollback on Heroku in staging and production
task :deploy_staging => ['deploy:set_staging_app', 'deploy:push', 'deploy:restart', 'deploy:tag']
task :deploy_production => ['deploy:set_production_app', 'deploy:push', 'deploy:restart', 'deploy:tag']

namespace :deploy do
  PRODUCTION_APP = 'YOUR_PRODUCTION_APP_NAME_ON_HEROKU'
  STAGING_APP = 'YOUR_STAGING_APP_NAME_ON_HEROKU'

  task :staging_migrations => [:set_staging_app, :push, :off, :migrate, :restart, :on, :tag]
  task :staging_rollback => [:set_staging_app, :off, :push_previous, :restart, :on]

humanzz

# This is a port of the javascript code found in the following link
#http://groups.google.com/group/Google-Maps-API/browse_thread/thread/a45947d72c27cc73

class Mercator
  #offset is defined at zoom level 21 which means that this Mercator is valid for 21 zoom levels
  OFFSET = 268435456
  RADIUS = OFFSET / Math::PI
  
  def self.lng_to_x(lng, zoom)
    (OFFSET + RADIUS * lng * Math::PI / 180).to_i >> (21 - zoom)

odrobnik

// UIImageJPEGRepresentation

NSData *data = UIImageJPEGRepresentation(tileImage, 0.71);
[data writeToURL:cacheURL atomically:YES];


// ImageIO

#import <ImageIO/ImageIO.h>
#import <MobileCoreServices/UTCoreTypes.h>

MartinMoizard

- (void)presentViewControllerFromVisibleViewController:(UIViewController *)viewControllerToPresent
{
    if ([self isKindOfClass:[UINavigationController class]]) {
        UINavigationController *navController = (UINavigationController *)self;
        [navController.topViewController presentViewControllerFromVisibleViewController:viewControllerToPresent];
    } else if (self.presentedViewController) {
        [self.presentedViewController presentViewControllerFromVisibleViewController:viewControllerToPresent];
    } else {
        [self presentModalViewController:viewControllerToPresent animated:YES];
    }

davbeck

_actionDelayTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:[NSBlockOperation blockOperationWithBlock:^{
    NSLog(@"Well this is useless.");
}] selector:@selector(start) userInfo:nil repeats:YES];