class Byebug::InfoCommand::FileCommand

def self.description
  <<-DESCRIPTION
    inf[o] f[ile]
    #{short_description}
    It informs about file name, number of lines, possible breakpoints in
    the file, last modification time and sha1 digest.
  DESCRIPTION
end

def self.regexp
  /^\s* f(?:ile)? (?:\s+ (.+))? \s*$/x
end

def self.short_description
  "Information about a particular source file."
end

def execute
  file = @match[1] || frame.file
  return errmsg(pr("info.errors.undefined_file", file: file)) unless File.exist?(file)
  puts prettify <<-RUBY
    File #{info_file_basic(file)}
    Breakpoint line numbers: #{info_file_breakpoints(file)}
    Modification time: #{info_file_mtime(file)}
    Sha1 Signature: #{info_file_sha1(file)}
  RUBY
end

def info_file_basic(file)
  path = File.expand_path(file)
  return unless File.exist?(path)
  s = n_lines(path) == 1 ? "" : "s"
  "#{path} (#{n_lines(path)} line#{s})"
end

def info_file_breakpoints(file)
  breakpoints = Breakpoint.potential_lines(file)
  return unless breakpoints
  breakpoints.to_a.sort.join(" ")
end

def info_file_mtime(file)
  File.stat(file).mtime
end

def info_file_sha1(file)
  require "digest/sha1"
  Digest::SHA1.hexdigest(file)
end