Javier Candeira candeira

Part 1

Proof of concept

Say, you want to save your D3 application in a CouchDB database. This is just a proof of concept that this is possible. I use the »Focus + Context« diagram by Mike Bostock (http://bl.ocks.org/1667367) as an example.

Prerequisites:

A running CouchDB (see http://couchdb.apache.org/; in my Windows installation CouchDb is started as a Windows service when Windows starts).
An installation of couchapp (how to install couchapp, see http://couchapp.org/page/index).
Your favorite editor.

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Om and React.js Does It Better

A hopefully short and concise explanation as to how Om/React.js works. This probably isn't for you if you already use ClojureScript or Om.

The front end and JavaScript God known as David Nolen created a ClojureScript library called Om. Om is a front end library that uses React.js and makes web MVC not just obsolete, but an anti-pattern.

In Om there's just the data and the view.

data =>

HOWTO: Use a DisplayLink USB graphics adapter on Crunchbang Linux v11 Waldorf with partial upgrade to Debian Jessie

I recently was able to get my Diamond-branded DisplayLink USB graphics adapter to work with a system onto which I had freshly installed Crunchbang 11 by:

switching to Debian Jessie repository
blacklisting udlfb kernel mod
messing with xrandr a bit

Upgrading to Jessie

Linux Backup Solutions

I've been looking for the best Linux backup system, and also reading lots of HN comments.

Instead of putting pros and cons of every backup system I'll just list some deal-breakers which would disqualify them.

Also I would like that you, the HN community, would add more deal breakers for these or other backup systems if you know some more and at the same time, if you have data to disprove some of the deal-breakers listed here (benchmarks, info about something being true for older releases but is fixed on newer releases), please share it so that I can edit this list accordingly.

Amanda (comments by sammcj)

It has a lot of management overhead and that's a problem if you don't have time for a full time backup administrator.

Interdisciplinary Open Source Community Conferences

Criteria

Must be an event that someone involved in open source would be interested in attending
Must be a community oriented event (no corporate owned for-profit events here please)
Can't be about a specific language/framework.

Leave suggestions in the comments below

Postgres Cheatsheet

This is a collection of the most common commands I run while administering Postgres databases. The variables shown between the open and closed tags, "<" and ">", should be replaced with a name you choose. Postgres has multiple shortcut functions, starting with a forward slash, "". Any SQL command that is not a shortcut, must end with a semicolon, ";". You can use the keyboard UP and DOWN keys to scroll the history of previous commands you've run.

Setup

installation, Ubuntu

http://www.postgresql.org/download/linux/ubuntu/ https://help.ubuntu.com/community/PostgreSQL

There's a couple of ways, one way is

Get search results
- Do SPC / and type in your search string
- or SPC x S and search string - where x is your scope indicator (p for project, d for directory, etc..)
Once you have the occurences you want, hit C-c C-e inside the helm buffer to put all your match occurences and puts them into a special buffer called the edit buffer or something like that
in that buffer you can use any commands you'd normally use on a buffer
the C-c C-c to commit your changes.

Nerd Fonts for your IDE

https://www.nerdfonts.com/font-downloads

The following solution thanks to @hackerzgz & @snacky101 will install all nerd fonts;

brew tap homebrew/cask-fonts
brew search '/font-.*-nerd-font/' | awk '{ print $1 }' | xargs -I{} brew install --cask {} || true

	;;; as_keith_midi.xtm -- live performance
	;; based on Andrew Sorensen "A Study in Keith" Impromptu performance
	;; "A Study In Keith" is a work for solo piano (NI's Akoustik Piano)
	;; by Andrew Sorensen inspired by Keith Jarrett's Sun Bear concerts.
	;; Orginal code transposed to Extempore
	;; http://extempore.moso.com.au
	;;
	;; Author: cv
	;; Keywords: extempore, live-coding, impromptu, keith jarret