Martin Czygan miku

Workflows (States) in Django

I'm going to cover a simple, but effective, utility for managing state and transitions (aka workflow). We often need to store the state (status) of a model and it should only be in one state at a time.

Common Software Uses

Publishing (Draft->Approved->Published->Expired->Deleted)

	#!/usr/bin/env bash

	# pre-push hook to prevent push of certain branches to github.com
	# copy this file to .git/hooks/pre-push
	# and make it +x

	REMOTE="$1"
	URL="$2"
	CURRENT_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
	FORBIDDEN_BRANCH="private" # change this to your private branch ...

	package interfaces

	import (
	"bufio"
	"crypto/elliptic"
	"crypto/tls"
	"database/sql/driver"
	"debug/dwarf"
	"encoding/xml"
	"fmt"

	#!/bin/sed -rf
	# How to run:
	# echo 'A A<1+B1-C>B<1-A1+B>D<1-B1qC> 0<0>0'
	# Note: Your local sed may use a different flag for "extended" regexes; this is written for GNU sed.
	#
	# tape: [active-state] " " (state-name "<" (write move next-state)_0 (write move next-state)_1 ">")* " " tape... "<" curpos ">" tape...
	# State names can be any character not in " <>".
	# The tape consists of 0's and 1's.
	# The "move" field can be "-" to move left, "+" to move right, or "q" to halt.

	package main

	import (
	"compress/gzip"
	"io"
	"net/http"
	"strings"
	)

	// Gzip Compression

	,_---~~~~~----._
	_,,_,^____ _____``g\",
	/ __/ /' ^. / \ ^@q f
	[ @f \| @)) \| \| @)) l 0 _/
	\`/ \~____ / __ \_____/ \
	\| _l__l_ I
	} [______] I
	] \| \| \| \|
	] ~ ~ \|
	\| \|

	import "bytes"

	func StreamToByte(stream io.Reader) []byte {
	buf := new(bytes.Buffer)
	buf.ReadFrom(stream)
	return buf.Bytes()
	}

	func StreamToString(stream io.Reader) string {
	buf := new(bytes.Buffer)

	# requires imagemagick and ffmpeg (tested with latest versions)
	# make sure you set an INFILE variable first

	# get GIF info
	video=$(ffmpeg -i "$INFILE" 2>&1 /dev/null \| grep "Video:");

	# get GIF Frames per second
	fps=$(echo "$video" \| sed -n "s/.* \([0-9.]\) fps./\1/p");

	# a convinience variable so we can easily set FPS on the video