djspiewak

Explaining Miles's Magic

Miles Sabin recently opened a pull request fixing the infamous SI-2712. First off, this is remarkable and, if merged, will make everyone's life enormously easier. This is a bug that a lot of people hit often without even realizing it, and they just assume that either they did something wrong or the compiler is broken in some weird way. It is especially common for users of scalaz or cats.

But that's not what I wanted to write about. What I want to write about is the exact semantics of Miles's fix, because it does impose some very specific assumptions about the way that type constructors work, and understanding those assumptions is the key to getting the most of it his fix.

For starters, here is the sort of thing that SI-2712 affects:

def foo[F[_], A](fa: F[A]): String = fa.toString

nicolewhite

Identifying Arbitrage Opportunities with Graphs

---

Introduction

DraTeots

Connecting to serial port (com port) over network

(Serial port or com port? - Serial ports are often refered as COM ports. It is the same to be short. You can read abut it in the Wiki article )

• The problem
• The solution in theory
• WINDOWS
  • Server
  • Client

• Driver Signature

kaito834

#!/usr/bin/env python
#
# tested by Python 3.4.3 on Windows 8.1
# Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)] on win32

# If you need to access web site/service via proxy, set http_proxy or https_proxy.
# https://docs.python.org/3/library/urllib.request.html#urllib.request.ProxyHandler
# set http_proxy=http://127.0.0.1:8888/
# set https_proxy=https://127.0.0.1:8888/

Temikus

# Script for sending user defined updates using DO API
# 2015 Artem Yakimenko <code at temik dot me>
#
# activated inside /etc/config/ddns by setting
#
# option update_script '/usr/lib/ddns/update_do.sh'
#
# the script is parsed (not executed) inside send_update() function
# of /usr/lib/ddns/dynamic_dns_functions.sh
# so you can use all available functions and global variables inside this script

voxxit

#!/usr/bin/env bash
set -x

# Domain you wish to update
DOMAIN="example.com"

# Get the v4/v6 addresses from icanhazip.com [pretty reliable!]
IPV4_ADDR=`wget -4 -q -O - icanhazip.com`
IPV6_ADDR=`wget -6 -q -O - icanhazip.com`

wdullaer

# Ask for the user password
# Script only works if sudo caches the password for a few minutes
sudo true

# Install kernel extra's to enable docker aufs support
# sudo apt-get -y install linux-image-extra-$(uname -r)

# Add Docker PPA and install latest version
# sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
# sudo sh -c "echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list"

Kartones

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)

sindresorhus

#!/usr/bin/env bash
# MIT © Sindre Sorhus - sindresorhus.com

# git hook to run a command after `git pull` if a specified file was changed
# Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.

changed_files="$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)"

check_run() {
	echo "$changed_files" | grep --quiet "$1" && eval "$2"

larrybolt

#!/usr/bin/php
<?php
$SSID=trim(`/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -I | awk -F: '/ SSID:/ {print $2}' | sed -e 's/.*SSID: //'`);
if ( $SSID == 'TELENETHOTSPOT' )
{
  if (`curl --cookie-jar /tmp/cookiejar \
	     --data "c=std&lang=nl&checkterms=1&userid=USERNAME&password=PASSWORD&remember=on&terms=on" \
	     --cookie "TNLANG=nl&TN_HS_COOKIE_DETECT=HELLO" \
             --max-time 60 \
	     --user-agent "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:20.0) Gecko/20100101 Firefox/20.0" \