From 150f62c377252e26aa9cb9c76b2aa0e5585648e6 Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Sat, 17 Jul 2021 22:35:35 +0200
Subject: [PATCH] riesa-efau-kalender: init

---
 default.nix                   |  1 +
 riesa-efau-kalender/scrape.rb | 70 +++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 riesa-efau-kalender/scrape.rb

diff --git a/default.nix b/default.nix
index a75155c..47295d7 100644
--- a/default.nix
+++ b/default.nix
@@ -30,4 +30,5 @@ in {
   matemat = wrapScript "matemat" ./matemat/scrape.rb;
   freifunk_node = wrapScript "freifunk_node" ./freifunk_node/scrape.rb;
   impfee = wrapScript "impfee" ./impfee/scrape.rb;
+  riesa-efau-kalender = wrapScript "riesa-efau-kalender" ./riesa-efau-kalender/scrape.rb;
 }
diff --git a/riesa-efau-kalender/scrape.rb b/riesa-efau-kalender/scrape.rb
new file mode 100644
index 0000000..5269cae
--- /dev/null
+++ b/riesa-efau-kalender/scrape.rb
@@ -0,0 +1,70 @@
+#!/usr/bin/env ruby
+# coding: utf-8
+
+require 'open-uri'
+require 'nokogiri'
+require 'erb'
+
+MONTHS = [
+  "Januar", "Februar", "März", "April",
+  "Mai", "Juni", "Juli", "August",
+  "September", "Oktober", "November", "Dezember",
+]
+
+def fmt_time t
+  t.strftime "%Y%m%dT%H%M%S"
+end
+
+class Event
+  attr_accessor :name, :location, :link
+  attr_reader :date
+
+  def date=(s)
+    if s =~ /(\d{1,2})\. (.+?) (\d{4}), (\d\d:\d\d) Uhr/
+      year = $3.to_i
+      month = MONTHS.index($2) + 1
+      day = $1.to_i
+      hour = $4.to_i
+      minute = $5.to_i
+      @date = Time::local year, month, date, hour, minute, 0
+    else
+      raise "Invalid date: #{s.inspect}"
+    end
+  end
+end
+
+events = []
+
+doc = Nokogiri::HTML URI.open("https://riesa-efau.de/index.php?id=87")
+doc.css(".tx-cal-controller .vevent").each do |vevent|
+  ev = Event::new
+  ev.name = vevent.css("h3").text
+  ev.location = vevent.css(".location").text
+                  .sub(/ *\.\.\.[^\.]*$/, "")
+  ev.date = vevent.css(".datum").text
+  ev.link = vevent.css(".url").attr('href').value
+  events << ev
+end
+
+events.sort_by! { |ev| ev.date }
+
+ical = ERB::new <<~EOF
+  BEGIN:VCALENDAR
+  VERSION:2.0
+  METHOD:PUBLISH
+  X-WR-TIMEZONE;VALUE=TEXT:Europe/Berlin
+  <% events.each do |ev| %>
+  BEGIN:VEVENT
+  METHOD:PUBLISH
+  CLASS:PUBLIC
+  UID:<%= ev.link %>
+  DTSTART:<%= fmt_time(ev.date) %>
+  DTEND:<%= fmt_time(ev.date + 2 * 3600) %>
+  SUMMARY:<%= ev.name %>
+  LOCATION:<%= ev.location %>
+  END:VEVENT
+  <% end %>
+  END:VCALENDAR
+EOF
+
+puts ical.result