Class: Byebug::History

Inherits:
Object
  • Object
show all
Defined in:
lib/byebug/history.rb

Overview

Handles byebug’s history of commands.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ History

Returns a new instance of History.



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# File 'lib/byebug/history.rb', line 10

def initialize
  self.size = 0
end

Instance Attribute Details

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/byebug/history.rb', line 8

def size
  @size
end

Instance Method Details

#clear ⇒ Object

Discards history.



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# File 'lib/byebug/history.rb', line 39

def clear
  size.times { pop }
end

#default_max_size ⇒ Object

Max number of commands to be displayed when no size has been specified.

Never more than Setting.



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# File 'lib/byebug/history.rb', line 88

def default_max_size
  [Setting[:histsize], self.size].min
end

#ignore?(buf) ⇒ Boolean

Whether a specific command should not be stored in history.

For now, empty lines and consecutive duplicates.

Returns:

  • (Boolean) 


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# File 'lib/byebug/history.rb', line 106

def ignore?(buf)
  return true if /^\s*$/ =~ buf
  return false if Readline::HISTORY.length == 0

  Readline::HISTORY[Readline::HISTORY.length - 1] == buf
end

#last_ids(n) ⇒ Object

Array of ids of the last n commands.



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# File 'lib/byebug/history.rb', line 77

def last_ids(n)
  from, to = 1 + self.size - n, self.size

  (from..to).to_a
end

#pop ⇒ Object

Removes a command from Readline’s history.



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# File 'lib/byebug/history.rb', line 56

def pop
  self.size -= 1
  Readline::HISTORY.pop
end

#push(cmd) ⇒ Object

Adds a new command to Readline’s history.



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# File 'lib/byebug/history.rb', line 46

def push(cmd)
  return if ignore?(cmd)

  self.size += 1
  Readline::HISTORY.push(cmd)
end

#restore ⇒ Object

Restores history from disk.



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# File 'lib/byebug/history.rb', line 17

def restore
  return unless File.exist?(Setting[:histfile])

  File.readlines(Setting[:histfile]).reverse.each { |l| push(l.chomp) }
end

#save ⇒ Object

Saves history to disk.



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# File 'lib/byebug/history.rb', line 26

def save
  n_cmds = Setting[:histsize] > size ? size : Setting[:histsize]

  open(Setting[:histfile], 'w') do |file|
    n_cmds.times { file.puts(pop) }
  end

  clear
end

#specific_max_size(number) ⇒ Object

Max number of commands to be displayed when a size has been specified.

The only bound here is not showing more items than available.



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# File 'lib/byebug/history.rb', line 97

def specific_max_size(number)
  [self.size, number].min
end

#to_s(n_cmds) ⇒ Object

Prints the requested numbers of history entries.



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# File 'lib/byebug/history.rb', line 64

def to_s(n_cmds)
  show_size = n_cmds ? specific_max_size(n_cmds) : default_max_size

  commands = Readline::HISTORY.to_a.last(show_size)

  last_ids(show_size).zip(commands).map do |l|
    format('%5d  %s', l[0], l[1])
  end.join("\n") + "\n"
end