Initial check for pgnmentor.com downloader

bin/pgnmentor_download.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+# download/get files.html
+# find (Events|Players|Openings updated): Month YYYY
+# => store in last update
+# => if one changed -> process
+
+# in files.html
+# div "Players"
+# => table below
+# => folder "players/"
+
+# div "Openings"
+# h2 "Modern Queen Pawn", "Classical Queen Pawn", "Modern King Pawn", "Classical King Pawn", "Flank and Unorthodox"
+# => table below each h2
+# => folder "openings/"
+
+# div "Events"
+# h2 "Tournaments", "Candidates and Interzonals", "World Championships"
+
+function error() {
+	if [ -t 1 ]; then echo "$1"; fi; exit 1;
+}
+
+# has to be YYYYMMDD
+current_date="${1}";
+
+if [ -z "${current_date}" ] || ! [[ "${current_date}" =~ ^[0-9]{8}$ ]]; then
+	error "Current date must be set and in the format YYYYMMDD";
+fi;
+
+
+# __END__