potd-get

#!/bin/bash

if [ -e ~/.cronenv ]; then
	. ~/.cronenv
fi

tgt="$1"
wiki="$2"
template="$3"
n="$4"

if [ -z "$n" ]; then
	if [ -z "$wiki" ] || [ "$wiki" == '-' ]; then wiki="commons.wikimedia.org"; fi
	if [ -z "$template" ] || [ "$template" == '-' ]; then template="Potd"; fi
	
	u="http://$wiki/wiki/Template:$template?action=render"
	
	s=`wget -q -O - "$u" | grep '<a href=".*/[^/]*:[^/"]*\.[^/"]*" class="image" title=""><img src=".*/></a>' | head -1`
	
	if [ -z "$s" ]; then 
		echo "failed to find image on $u"
		exit 3
	fi
	
	n=`echo "$s" | sed 's;^.*<a href=".*/[^/]*:\([^/"]*\)" class="image".*$;\1;'`
	ext="${n##*.}"
	base="${n%.*}"
	
	if [ -z "$tgt" ] || [ "$tgt" == "-" ]; then
		echo "$n";
		exit
	else	
		echo "Current Potd: $n  ($ext)";
	fi
	
	mem="$tgt/potd.name"
	
	if [ -e "$mem" ]; then
		prev=`cat "$mem"`
		
		if [ "$prev" == "$n" ]; then
			echo "same as previous, nothing to do"
			exit 
		fi
	fi
else
	ext="${n##*.}"
	base="${n%.*}"
	mem="$tgt/potd.name"
fi

get=`dirname "$0"`/image-get

$get "$wiki" "$n" "$tgt"/potd

if [ $? -ne 0 ]; then
	echo "failed to fetch image"
	exit 7
fi

f="potd-full.$ext"

rm "$tgt"/potd-*.* 2>/dev/null

mv "$tgt/potd.$ext" "$tgt/$f"

touch "$tgt/$f"

ulimit -v 128000 -d 128000 -t 120 
	
if [ "$ext" == "svg" ]; then
	which rsvg >/dev/null 2>&1;
	
	if [ $? -ne 0 ]; then
		echo "rsvg not found, can't render SVG!"
		exit 11
	fi
	
	dim=`grep '<image size=' "$tgt/potd.meta.xml" | head -1 | sed 's/^.*<image size="[0-9]*" width="\([0-9]*\)" height="\([0-9]*\)".*$/\1 \2/'`
	read width height <<< "$dim"

	if [ $? -ne 0 ]; then
		echo "image dimensions not found in $tgt/potd.meta.xml, can't render SVG!"
		exit 12
	fi
	
	echo "rendering SVG (${width}x${height})"
	
	calc=" width = $width; 
               height = $height; 
               scale=5; 
               fw = w/width; 
               fh = h/height; 
               if (fw < fh) f = fw else f = fh;
               print width * f, \" \", height * f, \"\n\""
	
	read w h <<< `echo " w = 200; h = 150; $calc" | bc`
	rsvg -w ${w%.*} -h ${h%.*} "$tgt/$f" "$tgt/potd-200x150.png"
	
	read w h <<< `echo " w = 400; h = 300; $calc" | bc`
	rsvg -w ${w%.*} -h ${h%.*} "$tgt/$f" "$tgt/potd-400x300.png"
	
	read w h <<< `echo " w = 800; h = 600; $calc" | bc`
	rsvg -w ${w%.*} -h ${h%.*} "$tgt/$f" "$tgt/potd-800x600.png"
	
	read w h <<< `echo " w = 1024; h = 768; $calc" | bc`
	rsvg -w ${w%.*} -h ${h%.*} "$tgt/$f" "$tgt/potd-1024x768.png"
	
	read w h <<< `echo " w = 1280; h = 1024; $calc" | bc`
	rsvg -w ${w%.*} -h ${h%.*} "$tgt/$f" "$tgt/potd-1280x1024.png"
	
	read w h <<< `echo " w = 1600; h = 1200; $calc" | bc`
	rsvg -w ${w%.*} -h ${h%.*} "$tgt/$f" "$tgt/potd-1600x1200.png"
else 
	echo "creating thumbnails..."

	nice -20 convert "$tgt/$f" -size '200x150' -resize '200x150>' -quality 90 "$tgt/potd-200x150.$ext"
	nice -20 convert "$tgt/$f" -size '400x300' -resize '400x300>' -quality 90 "$tgt/potd-400x300.$ext"
	nice -20 convert "$tgt/$f" -size '800x600' -resize '800x600>' -quality 90 "$tgt/potd-800x600.$ext"
	nice -20 convert "$tgt/$f" -size '1024x768' -resize '1024x768>' -quality 90 "$tgt/potd-1024x768.$ext"
	nice -20 convert "$tgt/$f" -size '1280x1024' -resize '1280x1024>' -quality 90 "$tgt/potd-1280x1024.$ext"
	nice -20 convert "$tgt/$f" -size '1600x1200' -resize '1600x1200>' -quality 90 "$tgt/potd-1600x1200.$ext"
	
	chmod a+r "$tgt"/potd-*."$ext" "$tgt"/potd.*
fi

echo "done."