#!/usr/bin/env ruby
require 'gm/notepad'

require 'optparse'
config = {
  config_reporting: false,
  defer_output: true,
  interactive_buffer: $stderr,
  output_buffer: $stdout,
  paths: ['.'],
  table_extension: '.txt',
  with_timestamp: false
}

command_name = File.basename(__FILE__)

OptionParser.new do |options|
  # This banner is the first line of your help documentation.
  options.set_banner "Usage: #{command_name} [options] [files]\n" \
    "Note taking tool with random table expansion.\n\n" \
    "Examples:\n" \
    "\t$ #{command_name}\n" \
    "\t$ #{command_name} rolls.txt\n" \
    "\t$ echo '{name}' | #{command_name}"

  # Separator just adds a new line with the specified text.
  options.separator ""
  options.separator "Specific options:"

  options.on("-t", "--timestamp", "Append a timestamp to the note (Default: #{config[:with_timestamp].inspect})") do |timestamp|
    config[:with_timestamp] = timestamp
  end

  options.on("-c", "--config_reporting", "Dump the configuration data (Default: #{config[:config_reporting].inspect})") do |config_reporting|
    config[:config_reporting] = config_reporting
  end

  options.on("-d", "--defer_output", "Defer output until system close (Default: #{config[:defer_output].inspect})") do |defer_output|
    config[:defer_output] = defer_output
  end

  options.on("-pPATH", "--path=PATH", String, "Path for {table_name}.<config.table_extension> files (Default: #{config[:paths].inspect})") do |path|
    config[:paths] << path
  end

  options.on("-tTABLE_EXTENSION", "--table_extension=TABLE_EXTENSION", String, "Path for {table_name}.<config.table_extension> files (Default: #{config[:table_extension].inspect})") do |table_extension|
    config[:table_extension] = table_extension
  end

  options.on("-l", "--list_tables", "List tables loaded (Default: #{config[:list_tables].inspect})") do |list_tables|
    config[:list_tables] = list_tables
  end

  options.on_tail("-h", "--help", "You're looking at it!") do
    $stderr.puts options
    exit 1
  end
end.parse!

if config[:list_tables]
  notepad = Gm::Notepad.new(config.merge(config_reporting: true))
  notepad.process(input: "+")
  exit(1)
end

begin
  @notepad = Gm::Notepad.new(**config)
  # Keep reading lines of input as long as they're coming.
  while input = ARGF.gets
    input.each_line do |input|
      begin
        @notepad.process(input: input)
      rescue Errno::EPIPE
        # sysexits(3) specifies that exit code 74 represent an IO error,
        # which is the likely situation
        @notepad.close!
        exit(74)
      end
    end
  end
ensure
  @notepad.close!
end