Clean and format subrip subtitles that have been converted from ASS format by ffmpeg.

format-srt.rb

#!/usr/bin/env ruby
require 'text/format'

class Entry
  attr_accessor :flighting, :body

  def initialize
    @body = []
  end

  def formatted_body
    body.each do |line|
      line.gsub!(/<[^>]*>/, '')
      line.gsub!(/\{[^\}]*\}/, '')
      line.gsub!("\r", '')
    end
    # If lines are too long they might overflow the screen. Seems like most
    # players support multiple lines at once, though. omxplayer does, at least.
    tf = Text::Format.new(columns: 55, first_indent: 0)
    tf.text = body.select {|x| x != ''}.join("\n")
    tf.format
  end
end

def each_entry(io)
  e = Entry.new
  io.each_line do |line|
    line.chomp!
    if line =~ /^\d+$/
      next if e.body.empty?
      yield e
      e = Entry.new
      next
    end
    if line =~ /^\d{2}:\d{2}:\d{2},\d{3} --> \d{2}:\d{2}:\d{2},\d{3}$/
      e.flighting = line
      next
    end
    e.body << line
  end
end

def format
  i = 1
  each_entry(ARGF) do |e|
    puts i
    puts e.flighting
    puts e.formatted_body
    puts
    i += 1
  end
end

if $0 == __FILE__
  format
end