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99 lines
2.8 KiB
Ruby
99 lines
2.8 KiB
Ruby
class Pry
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# The History class is responsible for maintaining the user's input history, both
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# internally and within Readline.
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class History
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attr_accessor :loader, :saver, :pusher, :clearer
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def initialize
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@history = []
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@saved_lines = 0
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restore_default_behavior
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end
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# Assign the default methods for loading, saving, pushing, and clearing.
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def restore_default_behavior
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@loader = method(:read_from_file)
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@saver = method(:write_to_file)
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@pusher = method(:push_to_readline)
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@clearer = method(:clear_readline)
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end
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# Load the input history using `History.loader`.
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# @return [Integer] The number of lines loaded
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def load
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@loader.call do |line|
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@pusher.call(line.chomp)
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@history << line.chomp
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end
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@saved_lines = @history.length
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end
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# Write this session's history using `History.saver`.
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# @return [Integer] The number of lines saved
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def save
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history_to_save = @history[@saved_lines..-1]
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@saver.call(history_to_save)
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@saved_lines = @history.length
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history_to_save.length
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end
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# Add a line to the input history, ignoring blank and duplicate lines.
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# @param [String] line
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# @return [String] The same line that was passed in
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def push(line)
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unless line.empty? || (@history.last && line == @history.last)
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@pusher.call(line)
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@history << line
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end
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line
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end
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alias << push
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# Clear all history. Anything the user entered before this point won't be
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# saved, but anything they put in afterwards will still be appended to the
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# history file on exit.
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def clear
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@clearer.call
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@history = []
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@saved_lines = 0
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end
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# Return an Array containing all stored history.
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# @return [Array<String>] An Array containing all lines of history loaded
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# or entered by the user in the current session.
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def to_a
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@history.dup
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end
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private
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# The default loader. Yields lines from `Pry.history.config.file`.
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def read_from_file
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history_file = File.expand_path(Pry.config.history.file)
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if File.exists?(history_file)
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File.foreach(history_file) { |line| yield(line) }
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end
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end
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# The default saver. Appends the given lines to `Pry.history.config.file`.
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# @param [Array<String>] lines
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def write_to_file(lines)
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history_file = File.expand_path(Pry.config.history.file)
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File.open(history_file, 'a') do |f|
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lines.each { |ln| f.puts ln }
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end
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end
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# The default pusher. Appends the given line to Readline::HISTORY.
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# @param [String] line
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def push_to_readline(line)
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Readline::HISTORY << line
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end
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# The default clearer. Clears Readline::HISTORY.
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def clear_readline
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Readline::HISTORY.shift until Readline::HISTORY.empty?
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end
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end
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end
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