Scrivener post-processing script which rename generated file into Jekyll post naming convention.

scrivener_rename_jekyll_blog_post_to_metadata_title.rb

#!/usr/bin/ruby
# This script rename blog-post to jekyll conventions naming.
# Suppose, that you have a file with metadata content.
# File.txt:
# ---
# title:'Wow, title. Rename blog-post.'
# date:26.01.2018 12:31:55 GMT+3
# ---

# ruby script.rb -i File.txt
# And result will be:
# 2018-01-26-Wow-title-rename-blog-post.md
# which contents metadata:
# ---
# title:'Wow, title. Rename blog-post.'
# date:2018-01-26 12:31:55 +0300
# ---

module Solution
  class Work
    class Date
      require 'date'
      attr_accessor :date

      def from_scrivener_date(date)
        DateTime.parse(date)
      end

      def initialize(date)
        # date is a string
        # formatted as
        # DD.MM.YYYY HH:MM:SS +/-TGMT
        @date = from_scrivener_date(date)
        puts "to_scrivener: #{to_scrivener}"
      end

      def to_scrivener
        # DD.MM.YYYY HH:MM:SS +/-TGMT
        # do not know how to get +3 GMT.
        # self.date.strftime('%d.%m.%Y %T %Z')
        # self.date.to_time.zone
        # do not know how? Oo
        # shit.
        ""
      end

      def to_jekyll
        # YYYY-MM-DD HH:MM:SS +/-TTTT
        self.date.strftime('%Y-%m-%d %T %z')
      end

      def to_jekyll_title
        # YYYY-MM-DD
        self.date.strftime('%Y-%m-%d')
      end
    end
    require 'optparse'
    require 'fileutils'
    # array come!
    def find_options_in_file(file)
      options = {
          date: nil,
          title: nil
      }
      until file.eof
        line = file.gets
        case line
          when /^title:['"](?<found>.+?)["']/
            options[:title] = $1
          when /^date:(?<found>.+?$)/
            options[:date] = Date.new($1)
        end
      end
      options
    end

    def convert_date(date)
      # jekyll format
      # YYYY-MM-DD HH:MM:SS +/-TTTT
      # DD.MM.YYYY HH:MM:SS +/-TGMT
    end

    def title_part_of_date(date)
      # YYYY-MM-DD
    end

    def simplify_title(file_options)
      title = file_options[:title]
      simple_title = title
                         .gsub(/[\W]/, "-").gsub(/--/, "-").gsub(/-$/, "")
                         .downcase.capitalize
      # next, append date correctly.
      # first, parse it and put in correct format.
      if file_options[:date]
        date = file_options[:date]
        result = date.to_jekyll_title # maybe find and replace date?
        simple_title = [result, simple_title].join('-') if result
      end
      puts "simplify_title: #{title} -> #{simple_title}"
      simple_title
    end

    def copy_file(from, to)
      puts "Copy: #{from} -> #{to}"
      FileUtils.copy(from, to)
    end

    def replace_date_in_file_for_jekyll(file, date)
      contents = File.read(file)
      jekyll_contents = contents.gsub(/^date:(?<found>.+?$)/, "date:#{date.to_jekyll}")
      File.open(file, 'w') {|f| f.puts jekyll_contents}
    end

    def work(array = [])
      options = parse array
      puts "options: #{options}"
      # retrieve name.
      from_file = options[:input]
      file_options = find_options_in_file(File.new(options[:input], "r"))
      puts "file options: #{file_options}"
      if file_options[:title]
        simple_title = simplify_title file_options
        unless simple_title
          puts "Title malformed. Check file_options: #{file_options} and file: #{from_file}"
          exit
        end
        to_file = [simple_title.sub(/\.+$/, ''), options[:extname]].join

        # process.
        copy_file(from_file, to_file)

        # now, find in file and replace items.
        replace_date_in_file_for_jekyll to_file, file_options[:date]
      else
        puts "No title found in #{from_file}"
      end
    end

    def default_options
      {
          extname: '.md'
      }
    end

    def parse(array = [])
      options = default_options
      puts "array is: #{array}"
      OptionParser.new do |opts|
        opts.banner = "Usage: rename_to_group.rb [options]"
        opts.on('-h', '--help', 'Show help') {puts opts.help; exit}
        opts.on('-i', '--input_file file', String, 'Input file name') {|arg| options[:input] = arg}
        opts.on('-e', '--extension_of_file ext', String, 'Extension of file') {|arg| options[:extname] = arg}
      end.parse(ARGV)
      options
    end
  end
end

Solution::Work.new.work(ARGV)