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class Pry
# The History class is responsible for maintaining the user's input history,
# both internally and within Readline.
class History
attr_accessor :loader, :saver, :pusher, :clearer
# @return [Fixnum] Number of lines in history when Pry first loaded.
attr_reader :original_lines
def initialize(options={})
@history = []
@original_lines = 0
@file_path = options[:file_path]
restore_default_behavior
end
# Assign the default methods for loading, saving, pushing, and clearing.
def restore_default_behavior
Pry.config.input # force Readline to load if applicable
@loader = method(:read_from_file)
@saver = method(:save_to_file)
if defined?(Readline)
@pusher = method(:push_to_readline)
@clearer = method(:clear_readline)
else
@pusher = proc { }
@clearer = proc { }
end
end
# Load the input history using `History.loader`.
# @return [Integer] The number of lines loaded
def load
@loader.call do |line|
@pusher.call(line.chomp)
@history << line.chomp
@original_lines += 1
end
end
# Add a line to the input history, ignoring blank and duplicate lines.
# @param [String] line
# @return [String] The same line that was passed in
def push(line)
unless line.empty? || (@history.last && line == @history.last)
@pusher.call(line)
@history << line
@saver.call(line) if Pry.config.history.should_save
end
line
end
alias << push
# Clear this session's history. This won't affect the contents of the
# history file.
def clear
@clearer.call
@history = []
@original_lines = 0
end
# @return [Fixnum] The number of lines in history.
def history_line_count
@history.count
end
# @return [Fixnum] The number of lines in history from just this session.
def session_line_count
@history.count - @original_lines
end
# Return an Array containing all stored history.
# @return [Array<String>] An Array containing all lines of history loaded
# or entered by the user in the current session.
def to_a
@history.dup
end
private
# The default loader. Yields lines from `Pry.history.config.file`.
def read_from_file
filename = File.expand_path(Pry.config.history.file)
if File.exists?(filename)
File.foreach(filename) { |line| yield(line) }
end
rescue => error
warn "History file not loaded: #{error.message}"
end
# The default pusher. Appends the given line to Readline::HISTORY.
# @param [String] line
def push_to_readline(line)
Readline::HISTORY << line
end
# The default clearer. Clears Readline::HISTORY.
def clear_readline
Readline::HISTORY.shift until Readline::HISTORY.empty?
end
# The default saver. Appends the given line to `Pry.history.config.file`.
def save_to_file(line)
history_file.puts line if history_file
end
# The history file, opened for appending.
def history_file
if defined?(@history_file)
@history_file
else
@history_file = File.open(file_path, 'a', 0600).tap { |f| f.sync = true }
end
rescue Errno::EACCES
warn 'History not saved; unable to open your history file for writing.'
@history_file = false
end
def file_path
@file_path || Pry.config.history.file
end
end
end
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