random bits of code | xcsrz

Modeled after Golang's ioutil package's NopCloser method which wraps an io.Reader interface in an io.ReadCloser facade interface, this code takes an io.Writer and a nil channel and returns an io.WriteCloser interface. The example.go file demonstrates usage in an http.HandleFunc as a very over complicated counter using the worker-and-channel-over-mutex pattern.

	package main

	import (
	"io"
	"log"
	"net/http"
	"strconv"
	)

	func main() {
	worker := NewWorker()
	http.HandleFunc("/count", func(w http.ResponseWriter, r *http.Request) {
	doneChan := make(chan struct{})
	worker.request <- WriteChanCloser(w, doneChan)
	<-doneChan
	})
	err := http.ListenAndServe(":8888", nil)
	if err != nil {
	log.Fatal("ListenAndServe: ", err)
	}
	}

	type Worker struct {
	count int
	request chan io.WriteCloser
	}

	func (w *Worker) run() {
	go func() {
	for {
	select {
	case req := <-w.request:
	w.count += 1
	req.Write([]byte(strconv.Itoa(w.count)))
	req.Close()
	}
	}
	}()
	}

	func NewWorker() *Worker {
	w := &Worker{
	count: 0,
	request: make(chan io.WriteCloser),
	}
	w.run()
	return w
	}

view raw example.go hosted with ❤ by GitHub

	package main

	import "io"

	type writeChanCloser struct {
	io.Writer
	closeChan chan struct{}
	}

	func (wcc writeChanCloser) Close() error {
	close(wcc.closeChan)
	return nil
	}

	// WriteChanCloser returns a WriteCloser with a Close method wrapping
	// the provided Reader r. The Close method simply closes the provided
	// nil channel.
	func WriteChanCloser(r io.Writer, c chan struct{}) io.WriteCloser {
	return writeChanCloser{r, c}
	}

view raw WriteChanCloser.go hosted with ❤ by GitHub

Center text on an image with Python and OpenCV. Had to come up with it myself as no one was spelling this out anywhere (or google couldn't find it)

	#!/usr/bin/env python

	import numpy as np
	import cv2
	from time import sleep

	# create blank image - y, x
	img = np.zeros((600, 1000, 3), np.uint8)

	# setup text
	font = cv2.FONT_HERSHEY_SIMPLEX
	text = "Hello Joseph!!"

	# get boundary of this text
	textsize = cv2.getTextSize(text, font, 1, 2)[0]

	# get coords based on boundary
	textX = (img.shape[1] - textsize[0]) / 2
	textY = (img.shape[0] + textsize[1]) / 2

	# add text centered on image
	cv2.putText(img, text, (textX, textY ), font, 1, (255, 255, 255), 2)

	# display image
	cv2.imshow('image', img)

	# wait so you can see the image
	sleep(25)

	# cleanup
	cv2.destroyAllWindows()

view raw center_text_on_image.py hosted with ❤ by GitHub

Terminal "utility" to copy ASCII emoji to the clipboard on OSX

	#!/bin/bash

	EMOTS=(
	"¯\_(ツ)_/¯"
	"༼ ༎ຶ ෴ ༎ຶ༽"
	"「(°ヘ°)"
	"(╯°□°）╯︵ ┻━┻"
	"༼ つ ◕_◕ ༽つ"
	"(✿◠‿◠)"
	"¯(°_o)/¯"
	"(͡° ͜ʖ ͡°)"
	"(ಠ_ಠ)"
	"(╯_╰)"
	"(─‿‿─)"
	"\,,/(^_^)\,,/"
	"(¬､¬)"
	"(ﾉﾟ0ﾟ)ﾉ"
	"(╯°□°)╯︵ ʞooqǝɔɐɟ"
	"(⌐■_■)"
	"╭∩╮（︶︿︶）╭∩╮"
	"c[_]"
	"(ง •̀_•́)ง"
	"(⌐■_■)︻╦╤─ "
	"(ಡ_ಡ)☞"
	"◕_◕"
	"(눈_눈)"
	"(◔_◔)"
	"\_(-_-)_/"
	"⊹╰(⌣ʟ⌣)╯⊹"
	)

	sel=-1
	while (($sel < 1))
	do
	for (( i = 1; i <= ${#EMOTS[@]}; i++ ))
	do
	echo "${i}) ${EMOTS[($i-1)]}"
	done
	read -p "Which one? " sel
	[[ "$sel" =~ ^[0-9]+$ ]] \|\| sel=-2
	(($sel > ${#EMOTS[@]})) && sel=-3
	done
	echo ${EMOTS[$sel-1]} \| pbcopy
	echo "... copied ${EMOTS[$sel-1]} to clipboard"

view raw emot.sh hosted with ❤ by GitHub

Grab stats from memcached

echo stats | nc 127.0.0.1 11211

view raw memcached-status.sh hosted with ❤ by GitHub

Bash function to bump minor semantic version number by even numbers.

	releaseBumpValue() {
	semver="${1}"
	local tifs=${IFS}
	local IFS='.'
	read -ra bits <<< "${semver}"
	if [ $((bits[1]%2)) -eq 0 ]; then
	echo 2
	else
	echo 1
	fi
	IFS=${tifs}
	}

view raw bump-to-even-numbers.sh hosted with ❤ by GitHub

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