chaitanyagupta

Reader Macros in Common Lisp

This post also appears on lisper.in.

Reader macros are perhaps not as famous as ordinary macros. While macros are a great way to create your own DSL, reader macros provide even greater flexibility by allowing you to create entirely new syntax on top of Lisp.

Paul Graham explains them very well in [On Lisp][] (Chapter 17, Read-Macros):

The three big moments in a Lisp expression's life are read-time, compile-time, and runtime. Functions are in control at runtime. Macros give us a chance to perform transformations on programs at compile-time. ...read-macros... do their work at read-time.

jsound

package de.am.gc.benchmarks;

/**
 * A GC micro benchmark running a given number of threads that create objects of a given size and dereference them immediately
 * 
 * @author jsound
 */
public class GarbageOnly {
    // object size in bytes
    private static final int DEFAULT_NUMBEROFTHREADS=8;

rofl0r

#define _XOPEN_SOURCE 700
#include <signal.h>
#include <unistd.h>

int main()
{
	sigset_t set;
	int status;

	if (getpid() != 1) return 1;

heptal

Displaying images in the terminal with tput and echo

Requires ImageMagick, easily available from your favorite package manager. Tested on Linux and OSX

convert image.png -resize 40 txt:-|sed -E 's/://;s/\( ? ?//;s/, ? ?/,/g;s/\)//;s/([0-9]+,[0-9]+,[0-9]+),[0-9]+/\1/g;s/255/254/g;/mage/d'|awk '{print $1,$2}'|sed -E 's/^0,[0-9]+ /print "echo;tput setaf "\;/;s/^[0-9]+,[0-9]+ /print "tput setaf ";/;s/(.+),(.+),(.+)/\1\/42.5*36+\2\/42.5*6+\3\/42.5+16/'|bc|sed 's/$/;echo -n "  ";/'|tr '\n' ' '|sed 's/^/tput rev;/;s/; /;/g;s/$/tput sgr0;echo/'|bash

jpetazzo

Rectifier

The diode bridge is the simplest rectifier I know.

Rectifier lets you share a directory with a docker container (just like $yourvm shared folders).

You don't have to install anything in your containers, and you only need to install diod in the host. diod is packaged on Ubuntu/Debian distros, and will automatically be apt-get install-ed if needed.

Since it uses diod to make a bridge, I called it rectifier. Yeah, that sucks, so if you have a better name, I'll steal it!

chrismcfee

May the Force be with You
A Tulpa Creation Guide
by Methos
Twitter: @GGMethos
[email protected]
v2.8.1
Last Edit: 28-Sep-2017


The following work falls under the Creative Commons Attribution 4.0 International (CC BY 4.0) License. The official terms of the license can be seen here:

quchen

13:15 <xQuasar>      | HASKELL IS FOR FUCKIN FAGGOTS. YOU'RE ALL A BUNCH OF 
                     | FUCKIN PUSSIES
13:15 <xQuasar>      | JAVASCRIPT FOR LIFE FAGS
13:16 <luite>        | hello
13:16 <ChongLi>      | somebody has a mental illness!
13:16 <merijn>       | Wow...I suddenly see the error of my ways and feel 
                     | compelled to write Node.js!
13:16 <genisage>     | hi
13:16 <luite>        | you might be pleased to learn that you can compile 
                     | haskell to javascript now

clarle

// Module dependencies

var express    = require('express'),
    mysql      = require('mysql');

// Application initialization

var connection = mysql.createConnection({
        host     : 'localhost',
        user     : 'root',

marktheunissen

This playbook has been removed as it is now very outdated.

Xe

class LinkedList {
	private class Node {
		public char data;
		public Node next;
		
		Node(char d, Node n) {
			data = d;
			next = n;
		}
	}