Add script for migration from asciinema hosting

Author: mico

lib/migrate_from_asciinema.rb

@@ -0,0 +1,29 @@
+require 'nokogiri'
+require 'open-uri'
+
+CASTS_IDS = [14083, 14084, 14085, 14086, 14087, 14088, 14089, 14090, 14091,
+             14092, 14093, 14095, 14100, 14101, 14102, 14103, 14103].freeze
+
+def get_cast(id)
+  open(File.expand_path("../../source/casts/#{id}.cast", __FILE__), 'w') do |f|
+    cast = open("https://asciinema.org/a/#{id}.cast").readlines.map do |r|
+      # remove redundant timing precision
+      r.gsub(/(\[\d+\.\d{2})\d+/, '\1')
+    end.join
+    f.puts cast
+  end
+end
+
+def get_poster(id)
+  poster = Nokogiri::HTML.parse(open("https://asciinema.org/a/#{id}/embed?size=small"))
+                         .xpath('//asciinema-player')
+                         .first[:poster]
+  open(File.expand_path("../../source/casts/#{id}.poster", __FILE__), 'w') do |f|
+    f.puts poster
+  end
+end
+
+CASTS_IDS.each do |id|
+  get_cast(id)
+  get_poster(id)
+end