Himawari 8 Weather Satellite Gif Grabber

wgif

#!/bin/bash
# Author Kaveen Rodrigo
# Dependecies ImageMagick % Xidel

band="snd"
frames="10"
outFile="wgif.gif"

baseUrl="http://www.data.jma.go.jp/mscweb/data/himawari/"

function splitByNewLine {
	SAVEIFS=$IFS
	IFS=$'\n'
	SPLIT_OUT=($1)
	IFS=$SAVEIFS
}
function displaySplitGroups {
	for (( i=0; i<${#SPLIT_OUT[@]} ; i+=4 )) ; do
		printf "%-5s%-30s%-5s%-30s\n" "${SPLIT_OUT[i+1]}" "${SPLIT_OUT[i]}" "${SPLIT_OUT[i+3]}" "${SPLIT_OUT[i+2]}"
	done
}
function displayHelp {
	echo "wgif <area> <band=$band> <frames=$frames> <fileName=$outFile>"
	echo "Avaiable Area Codes"
	splitByNewLine "$(xidel -s "$baseUrl/sat_img.php" -e "/html/body/div[1]/div[2]/div[2]/article/form/div[1]/select/option/(@value|.)")"
	displaySplitGroups
	echo "Avaiable Bands"
	splitByNewLine "$(xidel -s "$baseUrl/sat_img.php" -e "/html/body/div[1]/div[2]/div[2]/article/form/div[2]/select/option/(@value|.)")"
	displaySplitGroups
}

if [[ -z "$1" ]]; then
        echo "Input Error: Area not specified"
        displayHelp
        exit 1
fi
targetArea="$1"

imageDir="./.wgif_`date +%s`/"
function cleanup {      
  rm -rf "$imageDir"
  echo "Deleted temp working directory $imageDir"
}
trap cleanup EXIT

if [[ -n "$2" ]]; then 
	band="$2"
fi

if [[ -n "$3" ]]; then 
	frames="$3"
fi

if [[ -n "$4" ]]; then 
	outFile="$4"
fi

areaUrl="$baseUrl/sat_img.php?area=$targetArea"
timePath="//html/body/div[1]/div[2]/div[2]/article/form/div[3]/select/option/@value"

mkdir $imageDir
xidel -s "$areaUrl" -e "$timePath" | head -n $frames | while read timestamp; do
	imageFileName="${targetArea}_${band}_$timestamp.jpg"
	imageUrl="${baseUrl}img/$targetArea/$imageFileName";
	echo "Getting frame $timestamp"
	(cd $imageDir && curl -s -O $imageUrl)
done

magick convert -delay 80 $imageDir/*.jpg $outFile
echo "Sucess! Created gif $outFile"