Add script to generate the files for a day/today

tools/day_template.erb

@@ -0,0 +1,19 @@
+require_relative '../lib/aoc'
+
+module Day<%= str_day %>
+	extend AOC::Day
+
+	@num = <%= day %>
+	@ans_test1 = -1
+	@ans_test2 = -1
+
+	def self.solve_part1(input)
+		return 0
+	end
+
+	def self.solve_part2(input)
+		return 0
+	end
+end
+
+Day<%= str_day %>.run

tools/generate_files.rb

@@ -0,0 +1,37 @@
+require 'date'
+require 'erb'
+
+# Select and validate day number
+day = Date.today.strftime("%d").to_i
+if ARGV.length > 0
+	day = ARGV[0].to_i
+end
+if day < 1 or day > 25
+	puts "Usage: #{File.basename($0)} [day_number]"
+	exit
+end
+
+puts "Generating files for day #{day}..."
+
+str_day = "%02d" % day
+base_dir = File.join(File.expand_path("."))
+
+# Check if the files for this day already exists, do not overwrite!
+day_path = File.join(base_dir, "days", "day#{str_day}.rb")
+if File.exist?(day_path)
+	puts "The files for this day already exist"
+	exit
+end
+
+# Generate solution file from template
+tpl_file = File.read(File.join(base_dir, "tools", "day_template.erb"))
+tpl = ERB.new(tpl_file)
+File.write(day_path, tpl.result(binding))
+puts "Created solution file"
+
+# Generate test_input file
+test_path = File.join(base_dir, "inputs", "test", "test_input#{str_day}")
+File.write(test_path, "")
+puts "Created empty test file"
+
+puts "Done"