#!/usr/bin/env bash
function usage {
echo "usage: <n>$0"
echo "note: n is the number of essays to download"
echo "for specific n, the resulting pg.txt file will have the following number of tokens:"
echo "n | tokens"
echo "--- | ---"
echo "1 | 6230"
echo "2 | 23619"
echo "5 | 25859"
echo "10 | 36888"
echo "15 | 50188"
echo "20 | 59094"
echo "25 | 88764"
echo "30 | 103121"
echo "32 | 108338"
echo "35 | 113403"
echo "40 | 127699"
echo "45 | 135896"
exit 1
}
function has_cmd {
if ! [ -x "$(command -v $1)" ]; then
echo "error: $1 is not available" >&2
exit 1
fi
}
# check for: curl, html2text, tail, sed, fmt
has_cmd curl
has_cmd html2text
has_cmd tail
has_cmd sed
if [ $# -ne 1 ]; then
usage
fi
n=$1
# get urls
urls="$(curl http://www.aaronsw.com/2002/feeds/pgessays.rss | grep html | sed -e "s/.*http/http/" | sed -e "s/html.*/html/" | head -n $n)"
printf "urls:\n%s\n" "$urls"
if [ -f pg.txt ]; then
rm pg.txt
fi
c=1
for url in $urls; do
echo "processing $url"
cc=$(printf "%03d" $c)
curl -L $url | html2text | tail -n +4 | sed -E "s/^[[:space:]]+//g" | fmt -w 80 >> pg-$cc-one.txt
cat pg-$cc-one.txt >> pg.txt
cp -v pg.txt pg-$cc-all.txt
c=$((c+1))
# don't flood the server
sleep 1
done
echo "done. data in pg.txt"
exit 0