module Byebug::FileFunctions

def get_line(filename, lineno)


Reads line number +lineno+ from file named +filename+
def get_line(filename, lineno)
  File.open(filename) do |f|
    f.gets until f.lineno == lineno - 1
    f.gets
  end
end

def get_lines(filename)


Reads lines of source file +filename+ into an array
def get_lines(filename)
  File.foreach(filename).reduce([]) { |a, e| a << e.chomp }
end

def n_lines(filename)


one-line-at-a-time way.
Returns the number of lines in file +filename+ in a portable,
def n_lines(filename)
  File.foreach(filename).reduce(0) { |a, _e| a + 1 }
end

def normalize(filename)


Regularize file name.
def normalize(filename)
  return filename if ['(irb)', '-e'].include?(filename)
  return File.basename(filename) if Setting[:basename]
  path = File.expand_path(filename)
  File.exist?(path) ? File.realpath(path) : filename
end