papers-we-love_papers-we-love/scripts/download.sh

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#!/bin/bash
# Guard clause check if required binaries are installed
which wget > /dev/null || { echo "Error: wget not installed." ; exit 1 ; }
which egrep > /dev/null || { echo "Error: egrep not installed." ; exit 1 ; }
# Recursively traverse directories in repo scraping markdown file for URLs
# containing pdfs. Downloads pdfs into respective directories.
download_for_directory() {
cd $1 || { echo "Error: directory not found." ; exit 1 ; }
for f in *; do
if [[ -d ${f} ]]; then
download_for_directory "./${f}" &
fi
done
# Scrape URLs from markdown files
urls=$(ls | cat *.md 2> /dev/null | egrep -o 'https?://[^ ]+' | grep '\.pdf' | tr -d ')')
for url in "$urls"; do
# Ignore empty URLs
if [[ ! -z ${url} ]]; then
wget ${url} --no-clobber --quiet --timeout=5 --tries=2
fi
done
cd ..
echo "$1 done."
}
# If no directories are supplied, iterate over the entire repo.
if [[ "$#" -eq 0 ]]; then
REPO_ROOT_DIR="$(dirname $0)/.."
download_for_directory ${REPO_ROOT_DIR}
else
# Iterate over the specified directories
for dir in "$@"
do
download_for_directory ${dir}
done
fi
# Wait for child processes to terminate
wait