ww9

Use struct{} as keys for context.Value() in Go

In the other file of this gist I detail why we should use struct{} as context.Value() keys and not int or string. Open gist to see main.go but the TLDR is:

	type key struct{}
	ctx = context.WithValue(ctx, key{}, "my value") // Set value
	myValue, ok := ctx.Value(key{}).(string) // Get value

nickkraakman

FFmpeg Cheat Sheet for 360º video

Brought to you by Headjack

 
FFmpeg is one of the most powerful tools for video transcoding and manipulation, but it's fairly complex and confusing to use. That's why I decided to create this cheat sheet which shows some of the most often used commands.

 
Let's start with some basics:

• ffmpeg calls the FFmpeg application in the command line window, could also be the full path to the FFmpeg binary or .exe file

TauPan

# -*- coding: utf-8 -*-
import distutils.spawn
import os
import re
import socket
import subprocess

import xcffib.xproto
from libqtile import layout, bar, widget, hook
from libqtile.command import lazy

joshrotenberg

package main

// This is a basic example of running an nsqd instance embedded. It creates
// and runs an nsqd with all of the default options, and then produces
// and consumes a single message. You are probably better off running a
// standalone instance, but embedding it can simplify deployment and is
// useful in testing.

// See https://github.com/nsqio/nsq/blob/master/nsqd/options.go and
// https://github.com/nsqio/nsq/blob/master/apps/nsqd/nsqd.go for

olasd

#! /bin/bash
#
# Diffusion youtube avec ffmpeg

# Configurer youtube avec une résolution 720p. La vidéo n'est pas scalée.

VBR="2500k"                                    # Bitrate de la vidéo en sortie
FPS="30"                                       # FPS de la vidéo en sortie
QUAL="medium"                                  # Preset de qualité FFMPEG
YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  # URL de base RTMP youtube

klutzy

// emscripten uses le32-unknown-nacl triple but rustc doesn't know it now.
// So just use similar target instead.
// `rustc hello.rs --target=i686-unknown-linux --emit-llvm -S --cfg libc`
// `emcc hello.ll -o hello.js`

// no `extern mod`.
#[no_std];
#[feature(macro_rules)];

use core::container::Container;

scy

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

• From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
• That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

icholy

Zsh Tab Completion for Golang

This is pretty specific to my setup but the idea can be adapted to work with pretty much anything.

Go has a flag package which makes parsing command line arguments really easy.

package main

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname