todos.rb

require 'active_support/time'
require 'active_support/core_ext'

output_txt = ""
start_of_month = Time.now.beginning_of_month.to_date.strftime("%Y-%m-%d")
end_of_month = Time.now.end_of_month.to_date.strftime("%Y-%m-%d")

date_range = (start_of_month..end_of_month)

date_range.each do |d|
  text = <<~EOS
    ## #{d}

    - [ ] TODO1
    - [ ] TODO2
    - [ ] TODO3

  EOS

  output_txt << text
end

# File output
year = Date.today.year
month = Date.today.strftime("%m") # 03,04
File.open("#{year}/#{month}/README.md", "w") { |f| f.write(output_txt) }

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