class Pry
  class Command::Cat < Pry::ClassCommand
    require 'pry/commands/cat/abstract_formatter.rb'
    require 'pry/commands/cat/input_expression_formatter.rb'
    require 'pry/commands/cat/exception_formatter.rb'
    require 'pry/commands/cat/file_formatter.rb'

    match 'cat'
    group 'Input and Output'
    description "Show code from a file, Pry's input buffer, or the last exception."

    banner <<-'BANNER'
      Usage: cat FILE
             cat --ex [STACK_INDEX]
             cat --in [INPUT_INDEX_OR_RANGE]

      `cat` is capable of showing part or all of a source file, the context of the
      last exception, or an expression from Pry's input history.

      `cat --ex` defaults to showing the lines surrounding the location of the last
      exception. Invoking it more than once travels up the exception's backtrace, and
      providing a number shows the context of the given index of the backtrace.
    BANNER

    def options(opt)
      opt.on :ex,        "Show the context of the last exception", optional_argument: true, as: Integer
      opt.on :i, :in,    "Show one or more entries from Pry's expression history", optional_argument: true, as: Range, default: -5..-1
      opt.on :s, :start, "Starting line (defaults to the first line)", optional_argument: true, as: Integer
      opt.on :e, :end,   "Ending line (defaults to the last line)", optional_argument: true, as: Integer
      opt.on :l, :'line-numbers', "Show line numbers"
      opt.on :t, :type, "The file type for syntax highlighting (e.g., 'ruby' or 'python')", argument: true, as: Symbol
    end

    def process
      output = case
               when opts.present?(:ex)
                 ExceptionFormatter.new(_pry_.last_exception, _pry_, opts).format
               when opts.present?(:in)
                 InputExpressionFormatter.new(_pry_.input_ring, opts).format
               else
                 FileFormatter.new(args.first, _pry_, opts).format
               end

      _pry_.pager.page output
    end

    def complete(search)
      super | load_path_completions
    end

    def load_path_completions
      $LOAD_PATH.flat_map do |path|
        Dir[path + '/**/*'].map do |f|
          next if File.directory?(f)

          f.sub!(path + '/', '')
        end
      end
    end
  end

  Pry::Commands.add_command(Pry::Command::Cat)
end