class Byebug::History
Handles byebug's history of commands.
Attributes
size[RW]
Public Class Methods
new()
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# File lib/byebug/history.rb, line 20 def initialize self.size = 0 end
Public Instance Methods
clear()
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Discards history.
# File lib/byebug/history.rb, line 49 def clear size.times { pop } end
default_max_size()
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Max number of commands to be displayed when no size has been specified.
Never more than Setting.
# File lib/byebug/history.rb, line 98 def default_max_size [Setting[:histsize], self.size].min end
ignore?(buf)
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Whether a specific command should not be stored in history.
For now, empty lines and consecutive duplicates.
# File lib/byebug/history.rb, line 116 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)
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Array of ids of the last n commands.
# File lib/byebug/history.rb, line 87 def last_ids(n) from, to = 1 + self.size - n, self.size (from..to).to_a end
pop()
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Removes a command from Readline's history.
# File lib/byebug/history.rb, line 66 def pop self.size -= 1 Readline::HISTORY.pop end
push(cmd)
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Adds a new command to Readline's history.
# File lib/byebug/history.rb, line 56 def push(cmd) return if ignore?(cmd) self.size += 1 Readline::HISTORY.push(cmd) end
restore()
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Restores history from disk.
# File lib/byebug/history.rb, line 27 def restore return unless File.exist?(Setting[:histfile]) File.readlines(Setting[:histfile]).reverse.each { |l| push(l.chomp) } end
save()
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Saves history to disk.
# File lib/byebug/history.rb, line 36 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)
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Max number of commands to be displayed when a size has been specified.
The only bound here is not showing more items than available.
# File lib/byebug/history.rb, line 107 def specific_max_size(number) [self.size, number].min end
to_s(n_cmds)
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Prints the requested numbers of history entries.
# File lib/byebug/history.rb, line 74 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