adding gem file executable

lib/aoc.rb

@@ -0,0 +1,20 @@
+require "tty-prompt"
+require_relative "tasks/new_day"
+require_relative "tasks/part_two"
+
+class AOC
+  def self.run
+    prompt = TTY::Prompt.new
+
+    day = prompt.ask("Name the day (1-24)") do |q|
+      q.in("1-24")
+    end
+    selected = prompt.select("What do you want to do", "New day":0, "Add part 2 to a day":1)
+
+    if selected == 0
+      new_day(prompt, day)
+    elsif selected == 1
+      part_two(prompt, day)
+    end
+  end
+end

lib/tasks/new_day.rb

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+require "tty-prompt"
+require "tty-file"
+require "ostruct"
+
+require_relative("templates")
+
+def new_day(prompt, day)
+  input = prompt.multiline("Example input").join("")
+  print input
+  result = prompt.ask("Example result")
+
+  day_name = "day_#{day}"
+
+  TTY::File.create_dir(day_name)
+  TTY::File.create_file("#{day_name}/data")
+  TTY::File.create_file("#{day_name}/impl.rb", IMPL_RB)
+  TTY::File.create_file("#{day_name}/run.rb", RUN_RB)
+  TTY::File.create_file("#{day_name}/test.rb", TEST_RB)
+
+  TTY::File.replace_in_file "#{day_name}/run.rb", /%day_name%/, day_name
+  TTY::File.replace_in_file "#{day_name}/test.rb", /%day_name%/, day_name
+  TTY::File.replace_in_file "#{day_name}/test.rb", /%example_result%/, result 
+  TTY::File.replace_in_file "#{day_name}/test.rb", /%example_input%/, input 
+
+  puts "Done - run with:"
+  puts "ruby #{day_name}/test.rb"
+end

lib/tasks/part_two.rb

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+require "tty-prompt"
+
+def part_two(prompt, day)
+  prompt.say("part two not yet supported")
+end

lib/tasks/templates.rb

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+
+TEST_RB = <<~'TEST'
+require_relative "impl"
+
+INPUT = <<~IN
+%example_input%
+IN
+
+RESULT = %example_result%
+
+def test_example
+  parsed = parse(INPUT)
+  result = calculate(parsed)
+
+  if result == RESULT
+    puts "Test successful. Now run with real input"
+    puts "ruby %day_name%/run.rb"
+  else
+    puts "Test failed"
+    puts "expected \"#{RESULT}\" got \"#{result}\""
+  end
+end
+
+test_example
+TEST
+
+RUN_RB = <<~'RUN'
+require_relative "impl"
+
+def print(result)
+  if result.is_a? Array
+    result.map! {|l| "#{l}\n" } 
+  end
+  
+  puts result
+end
+
+def run
+  puts "running your implementation"
+  input = File.new("%day_name%/data").read
+  data = parse(input)
+  result = calculate(data)
+  print(result)
+end
+
+run
+RUN
+
+IMPL_RB = <<~'IMPL'
+#prepare the input which is a string containing new lines
+def parse(input)
+  data = []
+  input.each_line do |line|
+    data << line
+  end
+  data
+end
+
+# result should a single string or integer
+def calculate(data)
+  result = ""
+  data.each do |d|
+    result = d
+  end
+  result
+end
+IMPL