Module: IRB::HistorySavingAbility

Do not use. This module is for internal use only.

Relationships & Source Files
Defined in:	lib/irb/ext/save-history.rb, lib/irb/ext/save-history.rb

Class Method Summary

.extended(obj)

Instance Method Summary

#load_history
#save_history

Class Method Details

.extended(obj)

[ GitHub ]

# File 'lib/irb/ext/save-history.rb', line 59


def HistorySavingAbility.extended(obj)
  IRB.conf[:AT_EXIT].push proc{obj.save_history}
  obj.load_history
  obj
end

Instance Method Details

#load_history

[ GitHub ]

# File 'lib/irb/ext/save-history.rb', line 65


def load_history
  return unless self.class.const_defined?(:HISTORY)
  history = self.class::HISTORY
  if history_file = IRB.conf[:HISTORY_FILE]
    history_file = File.expand_path(history_file)
  end
  history_file = IRB.rc_file("_history") unless history_file
  if File.exist?(history_file)
    File.open(history_file, "r:#{IRB.conf[:LC_MESSAGES].encoding}") do |f|
      f.each { |l|
        l = l.chomp
        if self.class == RelineInputMethod and history.last&.end_with?("\\")
          history.last.delete_suffix!("\\")
          history.last << "\n" << l
        else
          history << l
        end
      }
    end
    @loaded_history_lines = history.size
    @loaded_history_mtime = File.mtime(history_file)
  end
end

#save_history

[ GitHub ]

# File 'lib/irb/ext/save-history.rb', line 89


def save_history
  return unless self.class.const_defined?(:HISTORY)
  history = self.class::HISTORY
  if num = IRB.conf[:SAVE_HISTORY] and (num = num.to_i) != 0
    if history_file = IRB.conf[:HISTORY_FILE]
      history_file = File.expand_path(history_file)
    end
    history_file = IRB.rc_file("_history") unless history_file

    # Change the permission of a file that already exists[BUG #7694]
    begin
      if File.stat(history_file).mode & 066 != 0
        File.chmod(0600, history_file)
      end
    rescue Errno::ENOENT
    rescue Errno::EPERM
      return
    rescue
      raise
    end

    if File.exist?(history_file) &&
       File.mtime(history_file) != @loaded_history_mtime
      history = history[@loaded_history_lines..-1] if @loaded_history_lines
      append_history = true
    end

    File.open(history_file, (append_history ? 'a' : 'w'), 0o600, encoding: IRB.conf[:LC_MESSAGES]&.encoding) do |f|
      hist = history.map{ |l| l.split("\n").join("\\\n") }
      unless append_history
        begin
          hist = hist.last(num) if hist.size > num and num > 0
        rescue RangeError # bignum too big to convert into `long'
          # Do nothing because the bignum should be treated as inifinity
        end
      end
      f.puts(hist)
    end
  end
end