alepez’s gists

alepez / gist:7767581

Created December 3, 2013 11:17

	To make the black pixels transparent and keeps the white pixels as they are, run this command:

	convert source.png -alpha copy -fx '#fff' result.png

alepez / express-recursive-routing.js

Last active December 28, 2015 04:59

express recursive routing with namespace

	var fs = require('fs');
	var path = require('path');

	var walk = function(dir, done) {
	var results = {};
	fs.readdir(dir, function(err, list) {
	if (err) {
	return done(err);
	}
	var i = 0;

alepez / EventEmitter_Object_create.js

Created November 6, 2013 13:38

inherit EventEmitter Crockford's way

	var EventEmitter = require('events').EventEmitter;
	var a = Object.create(EventEmitter.prototype);

	a.on('x', function() { console.log("x!"); });
	a.emit("x");

alepez / launch_detached.js

Last active December 27, 2015 11:59

Launch a detached process of node running 'app.js' in the same directory of this script.

	#!/usr/bin/env node

	var spawn = require('child_process').spawn;
	var path = require('path');
	var nodeBin = process.execPath;
	var appjs = path.resolve(__dirname, 'app.js');
	var options = { detached: true, stdio: 'ignore', cwd: __dirname };
	var child = spawn(nodeBin, [appjs], options);
	child.unref();

alepez / omx.js

Last active December 27, 2015 11:49

	var spawn = require('child_process').spawn;
	var util = require('util');

	var commands = {
	'pause' : 'p',
	'quit' : 'q',
	'play' : '.', // TODO: check
	'forward' : "$'\\x1b\\x5b\\x43'", // TODO: check
	'backward' : "$'\\x1b\\x5b\\x44'" // TODO: check
	};

alepez / classical_vs_prototypal.js

Created November 4, 2013 14:19

node.js profiling memory classical vs prototypal

	var memwatch = require('memwatch');

	var classical = function() {

	var Apple = function(options) {
	var self = this;
	var color = options.color;
	var getColor = function() {
	return color;
	};

alepez / rpi-gpio.js

Created October 29, 2013 11:33

	var gpio = require("pi-gpio");
	gpio.open(11, "input", function(err) { if (err) { console.log(err); }});
	setInterval( function() { gpio.read(11, function(err, value) { console.log("value:", value); }); }, 1000);

alepez / libao.conf

Created October 17, 2013 13:51

ogg123 and alsa dmix

	default_driver=alsa
	dev=default

alepez / redmine_identifier_update.sql

Created July 24, 2013 16:03

Redmine: change project identifier with sql query.

UPDATE projects SET identifier = 'new_identifier' WHERE identifier = 'current_identifier';

alepez / 24xx_i2c_address.rb

Last active December 20, 2015 03:19

Calculate 24xx eeprom addresses relationship with A0-A1-A2

	8.times { \|i\| p "0x#{(0x50 + i).to_s(16)} => A0: #{(i & 0x1) == 1 ? "HIGH" : "LOW "}, A1: #{((i & 0x2) >> 1) == 1 ? "HIGH" : "LOW "}, A2: #{((i & 0x4) >> 2) == 1 ? "HIGH" : "LOW "}" }

	# "0x50 => A0: LOW , A1: LOW , A2: LOW "
	# "0x51 => A0: HIGH, A1: LOW , A2: LOW "
	# "0x52 => A0: LOW , A1: HIGH, A2: LOW "
	# "0x53 => A0: HIGH, A1: HIGH, A2: LOW "
	# "0x54 => A0: LOW , A1: LOW , A2: HIGH"
	# "0x55 => A0: HIGH, A1: LOW , A2: HIGH"
	# "0x56 => A0: LOW , A1: HIGH, A2: HIGH"
	# "0x57 => A0: HIGH, A1: HIGH, A2: HIGH"

Alessandro Pezzato alepez