Victor Schröder schrodervictor

Requirements

Encrypt everthing including /boot and /root
Enter password once
Support UEFI

Installation media setup

Download NixOS minimal iso and copy to USB stick. For example on Mac OSX

$ diskutil list
$ diskutil unmountDisk /dev/disk1 # Make sure you got right device

ESP32 as Bluetooth Keyboard

With its built-in Bluetooth capabilities, the ESP32 can act as a Bluetooth keyboard. The below code is a minimal example of how to achieve it. It will generate the key strokes for a message whenever a button attached to the ESP32 is pressed.

For the example setup, a momentary button should be connected to pin 2 and to ground. Pin 2 will be configured as an input with pull-up.

In order to receive the message, add the ESP32 as a Bluetooth keyboard of your computer or mobile phone:

Go to your computers/phones settings
Ensure Bluetooth is turned on

Enable the tracer on your xdebug.ini file (see the xdebug.ini file).
If you are gonna trace an http request, make sure your xdebug.trace_output_dir is writable by the webserver user (www-data).
Execute your script or your request. You can use produce_segmentation.php to test.
See the trace file(s) on your xdebug.trace_output_dir.

Importing/Indexing database (MySQL or SQL Server) in Solr using Data Import Handler

Install Solr

download and install Solr from http://lucene.apache.org/solr/.

you can access Solr admin from your browser: http://localhost:8983/solr/

use the port number used in installation.

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

var Article = require('../../../models/article');

Those suck for maintenance and they're ugly.

	import argparse
	from PIL import Image

	parser = argparse.ArgumentParser()
	parser.add_argument("inputfile", help="Path to the image file to convert")
	parser.add_argument("-o", "--output", help="Path to output file with the C array, if not given the same filename as the input is used, with filetype .c", action="store_true")
	parser.add_argument("-p", "--preview", help="Print the resulting image to the terminal", action="store_true")
	parser.add_argument("-d", "--dither", help="Set flag to dither image in conversion from colour to BW, if applicable", action="store_true")
	parser.add_argument("-s", "--small", help="Set flag if your OLED has a resolution of 128x32 instead of 128x64", action="store_true")
	parser.add_argument("-x", "--width", help="Pixel width of your OLED", type=int)

	/**
	* Uncamelize a string, joining the words by separator character.
	*
	* @param {string} text - Text to uncamelize
	* @param {string} [separator='_'] - Word separator
	* @returns {string} Uncamelized text
	*/
	function uncamelize(text, separator) {
	// Assume separator is _ if no one has been provided.
	if('undefined' === typeof separator) {

	SELECT
	-- Attributes in the pivot table:
	-- `p`.`whatever` AS `whatever`

	p.entity_id AS id,
	p.sku AS sku,

	-- Attributes in the EAV tables:
	-- IFNULL(`store_whatever`.`value`, `default_whatever`) AS `whatever`

	echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
	. ~/.bashrc
	mkdir ~/local
	mkdir ~/node-latest-install
	cd ~/node-latest-install
	curl http://nodejs.org/dist/node-latest.tar.gz \| tar xz --strip-components=1
	./configure --prefix=~/local
	make install # ok, fine, this step probably takes more than 30 seconds...
	curl https://www.npmjs.org/install.sh \| sh

	// This script will boot app.js with the number of workers
	// specified in WORKER_COUNT.
	//
	// The master will respond to SIGHUP, which will trigger
	// restarting all the workers and reloading the app.

	var cluster = require('cluster');
	var workerCount = process.env.WORKER_COUNT \|\| 2;

	// Defines what each worker needs to run