mirror of
https://github.com/pry/pry.git
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760 lines
24 KiB
Ruby
760 lines
24 KiB
Ruby
require "pry/indent"
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##
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# Pry is a powerful alternative to the standard IRB shell for Ruby. It
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# features syntax highlighting, a flexible plugin architecture, runtime
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# invocation and source and documentation browsing.
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#
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# Pry can be started similar to other command line utilities by simply running
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# the following command:
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#
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# pry
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#
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# Once inside Pry you can invoke the help message:
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#
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# help
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#
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# This will show a list of available commands and their usage. For more
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# information about Pry you can refer to the following resources:
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#
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# * http://pry.github.com/
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# * https://github.com/pry/pry
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# * the IRC channel, which is #pry on the Freenode network
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#
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class Pry
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attr_accessor :input
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attr_accessor :output
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attr_accessor :commands
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attr_accessor :print
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attr_accessor :exception_handler
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attr_accessor :input_stack
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attr_accessor :quiet
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alias :quiet? :quiet
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attr_accessor :custom_completions
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attr_accessor :binding_stack
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attr_accessor :last_result
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attr_accessor :last_file
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attr_accessor :last_dir
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attr_reader :last_exception
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attr_reader :input_array
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attr_reader :output_array
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attr_accessor :backtrace
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attr_accessor :extra_sticky_locals
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attr_accessor :suppress_output
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# This is exposed via Pry::Command#state.
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attr_reader :command_state
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# Special treatment for hooks as we want to alert people of the
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# changed API
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attr_reader :hooks
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# FIXME:
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# This is a hack to alert people of the new API.
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# @param [Pry::Hooks] v Only accept `Pry::Hooks` now!
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def hooks=(v)
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if v.is_a?(Hash)
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warn "Hash-based hooks are now deprecated! Use a `Pry::Hooks` object instead! http://rubydoc.info/github/pry/pry/master/Pry/Hooks"
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@hooks = Pry::Hooks.from_hash(v)
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else
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@hooks = v
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end
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end
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# Create a new `Pry` object.
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# @param [Hash] options The optional configuration parameters.
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# @option options [#readline] :input The object to use for input.
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# @option options [#puts] :output The object to use for output.
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# @option options [Pry::CommandBase] :commands The object to use for commands.
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# @option options [Hash] :hooks The defined hook Procs
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# @option options [Array<Proc>] :prompt The array of Procs to use for the prompts.
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# @option options [Proc] :print The Proc to use for the 'print'
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# @option options [Boolean] :quiet If true, omit the whereami banner when starting.
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# component of the REPL. (see print.rb)
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def initialize(options={})
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refresh(options)
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@binding_stack = []
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@indent = Pry::Indent.new
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@command_state = {}
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end
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# Refresh the Pry instance settings from the Pry class.
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# Allows options to be specified to override settings from Pry class.
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# @param [Hash] options The options to override Pry class settings
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# for this instance.
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def refresh(options={})
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defaults = {}
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attributes = [
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:input, :output, :commands, :print, :quiet,
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:exception_handler, :hooks, :custom_completions,
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:prompt, :memory_size, :extra_sticky_locals
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]
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attributes.each do |attribute|
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defaults[attribute] = Pry.send attribute
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end
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defaults[:input_stack] = Pry.input_stack.dup
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defaults.merge!(options).each do |key, value|
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send("#{key}=", value) if respond_to?("#{key}=")
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end
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true
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end
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# The currently active `Binding`.
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# @return [Binding] The currently active `Binding` for the session.
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def current_context
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binding_stack.last
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end
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# The current prompt.
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# This is the prompt at the top of the prompt stack.
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#
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# @example
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# self.prompt = Pry::SIMPLE_PROMPT
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# self.prompt # => Pry::SIMPLE_PROMPT
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#
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# @return [Array<Proc>] Current prompt.
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def prompt
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prompt_stack.last
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end
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def prompt=(new_prompt)
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if prompt_stack.empty?
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push_prompt new_prompt
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else
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prompt_stack[-1] = new_prompt
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end
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end
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# Injects a local variable into the provided binding.
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# @param [String] name The name of the local to inject.
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# @param [Object] value The value to set the local to.
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# @param [Binding] b The binding to set the local on.
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# @return [Object] The value the local was set to.
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def inject_local(name, value, b)
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Thread.current[:__pry_local__] = value.is_a?(Proc) ? value.call : value
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b.eval("#{name} = ::Thread.current[:__pry_local__]")
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ensure
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Thread.current[:__pry_local__] = nil
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end
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# @return [Integer] The maximum amount of objects remembered by the inp and
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# out arrays. Defaults to 100.
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def memory_size
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@output_array.max_size
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end
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def memory_size=(size)
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@input_array = Pry::HistoryArray.new(size)
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@output_array = Pry::HistoryArray.new(size)
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end
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# Inject all the sticky locals into the `target` binding.
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# @param [Binding] target
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def inject_sticky_locals(target)
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sticky_locals.each_pair do |name, value|
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inject_local(name, value, target)
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end
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end
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# Add a sticky local to this Pry instance.
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# A sticky local is a local that persists between all bindings in a session.
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# @param [Symbol] name The name of the sticky local.
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# @yield The block that defines the content of the local. The local
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# will be refreshed at each tick of the repl loop.
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def add_sticky_local(name, &block)
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sticky_locals[name] = block
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end
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# @return [Hash] The currently defined sticky locals.
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def sticky_locals
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@sticky_locals ||= {
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:_in_ => proc { @input_array },
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:_out_ => proc { @output_array },
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:_pry_ => self,
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:_ex_ => proc { last_exception },
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:_file_ => proc { last_file },
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:_dir_ => proc { last_dir },
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:_ => proc { last_result },
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:__ => proc { @output_array[-2] }
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}.merge(extra_sticky_locals)
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end
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# Initialize the repl session.
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# @param [Binding] target The target binding for the session.
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def repl_prologue(target)
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exec_hook :before_session, output, target, self
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set_last_result(nil, target)
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@input_array << nil # add empty input so _in_ and _out_ match
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binding_stack.push target
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end
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# Clean-up after the repl session.
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# @param [Binding] target The target binding for the session.
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def repl_epilogue(target)
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exec_hook :after_session, output, target, self
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binding_stack.pop
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Pry.save_history if Pry.config.history.should_save
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end
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# Start a read-eval-print-loop.
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# If no parameter is given, default to top-level (main).
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# @param [Object, Binding] target The receiver of the Pry session
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# @return [Object] The target of the Pry session or an explictly given
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# return value. If given return value is `nil` or no return value
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# is specified then `target` will be returned.
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# @example
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# Pry.new.repl(Object.new)
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def repl(target=TOPLEVEL_BINDING)
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target = Pry.binding_for(target)
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repl_prologue(target)
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break_data = nil
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exception = catch(:raise_up) do
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break_data = catch(:breakout) do
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loop do
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throw(:breakout) if binding_stack.empty?
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rep(binding_stack.last)
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end
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end
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exception = false
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end
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raise exception if exception
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break_data
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ensure
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repl_epilogue(target)
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end
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# Perform a read-eval-print.
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# If no parameter is given, default to top-level (main).
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# @param [Object, Binding] target The receiver of the read-eval-print
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# @example
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# Pry.new.rep(Object.new)
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def rep(target=TOPLEVEL_BINDING)
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target = Pry.binding_for(target)
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result = re(target)
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Pry.critical_section do
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show_result(result)
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end
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end
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# Perform a read-eval
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# If no parameter is given, default to top-level (main).
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# @param [Object, Binding] target The receiver of the read-eval-print
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# @return [Object] The result of the eval or an `Exception` object in case of
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# error. In the latter case, you can check whether the exception was raised
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# or is just the result of the expression using #last_result_is_exception?
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# @example
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# Pry.new.re(Object.new)
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def re(target=TOPLEVEL_BINDING)
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target = Pry.binding_for(target)
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# It's not actually redundant to inject them continually as we may have
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# moved into the scope of a new Binding (e.g the user typed `cd`).
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inject_sticky_locals(target)
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code = r(target)
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evaluate_ruby(code, target)
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rescue RescuableException => e
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self.last_exception = e
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e
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end
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# Perform a read.
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# If no parameter is given, default to top-level (main).
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# This is a multi-line read; so the read continues until a valid
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# Ruby expression is received.
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# Pry commands are also accepted here and operate on the target.
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# @param [Object, Binding] target The receiver of the read.
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# @param [String] eval_string Optionally Prime `eval_string` with a start value.
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# @return [String] The Ruby expression.
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# @example
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# Pry.new.r(Object.new)
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def r(target=TOPLEVEL_BINDING, eval_string="")
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target = Pry.binding_for(target)
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@suppress_output = false
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loop do
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begin
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# eval_string will probably be mutated by this method
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retrieve_line(eval_string, target)
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rescue CommandError, Slop::InvalidOptionError, MethodSource::SourceNotFoundError => e
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output.puts "Error: #{e.message}"
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end
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begin
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break if Pry::Code.complete_expression?(eval_string)
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rescue SyntaxError => e
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output.puts "SyntaxError: #{e.message.sub(/.*syntax error, */m, '')}"
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eval_string = ""
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end
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end
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if eval_string =~ /;\Z/ || eval_string.empty? || eval_string =~ /\A *#.*\n\z/
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@suppress_output = true
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end
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exec_hook :after_read, eval_string, self
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eval_string
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end
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def evaluate_ruby(code, target = binding_stack.last)
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target = Pry.binding_for(target)
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inject_sticky_locals(target)
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exec_hook :before_eval, code, self
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result = target.eval(code, Pry.eval_path, Pry.current_line)
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set_last_result(result, target, code)
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ensure
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update_input_history(code)
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exec_hook :after_eval, result, self
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end
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# Output the result or pass to an exception handler (if result is an exception).
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def show_result(result)
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if last_result_is_exception?
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exception_handler.call(output, result, self)
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elsif should_print?
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output.write(Pry.config.output_prefix)
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print.call(output, result)
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else
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# nothin'
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end
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rescue RescuableException => e
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# Being uber-paranoid here, given that this exception arose because we couldn't
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# serialize something in the user's program, let's not assume we can serialize
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# the exception either.
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begin
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output.puts "(pry) output error: #{e.inspect}"
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rescue RescuableException => e
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if last_result_is_exception?
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output.puts "(pry) output error: failed to show exception"
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else
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output.puts "(pry) output error: failed to show result"
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end
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end
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end
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def should_force_encoding?(eval_string, val)
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eval_string.empty? && val.respond_to?(:encoding) && val.encoding != eval_string.encoding
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end
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private :should_force_encoding?
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# Read and process a line of input -- check for ^D, determine which prompt to
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# use, rewrite the indentation if `Pry.config.auto_indent` is enabled, and,
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# if the line is a command, process it and alter the eval_string accordingly.
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# This method should not need to be invoked directly.
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#
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# @param [String] eval_string The cumulative lines of input.
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# @param [Binding] target The target of the session.
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# @return [String] The line received.
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def retrieve_line(eval_string, target)
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@indent.reset if eval_string.empty?
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current_prompt = select_prompt(eval_string, target)
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completion_proc = Pry.config.completer.build_completion_proc(target, self,
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instance_eval(&custom_completions))
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safe_completion_proc = proc{ |*a| Pry.critical_section{ completion_proc.call(*a) } }
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indentation = Pry.config.auto_indent ? @indent.current_prefix : ''
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begin
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val = readline("#{current_prompt}#{indentation}", safe_completion_proc)
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# Handle <Ctrl+C> like Bash, empty the current input buffer but do not quit.
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# This is only for ruby-1.9; other versions of ruby do not let you send Interrupt
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# from within Readline.
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rescue Interrupt
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output.puts ""
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eval_string.replace("")
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return
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end
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# invoke handler if we receive EOF character (^D)
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if !val
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output.puts ""
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Pry.config.control_d_handler.call(eval_string, self)
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return
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end
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# Change the eval_string into the input encoding (Issue 284)
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# TODO: This wouldn't be necessary if the eval_string was constructed from
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# input strings only.
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if should_force_encoding?(eval_string, val)
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eval_string.force_encoding(val.encoding)
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end
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if Pry.config.auto_indent && !input.is_a?(StringIO)
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original_val = "#{indentation}#{val}"
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indented_val = @indent.indent(val)
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if output.tty? && Pry::Helpers::BaseHelpers.use_ansi_codes? && Pry.config.correct_indent
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output.print @indent.correct_indentation(current_prompt, indented_val, original_val.length - indented_val.length)
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output.flush
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end
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else
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indented_val = val
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end
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# Check this before processing the line, because a command might change
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# Pry's input.
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interactive = !input.is_a?(StringIO)
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begin
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if !process_command(val, eval_string, target)
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eval_string << "#{indented_val.chomp}\n" unless val.empty?
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end
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ensure
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Pry.history << indented_val if interactive
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end
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end
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# If the given line is a valid command, process it in the context of the
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# current `eval_string` and context.
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# This method should not need to be invoked directly.
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# @param [String] val The line to process.
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# @param [String] eval_string The cumulative lines of input.
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# @param [Binding] target The target of the Pry session.
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# @return [Boolean] `true` if `val` is a command, `false` otherwise
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def process_command(val, eval_string = '', target = binding_stack.last)
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val = val.chomp
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result = commands.process_line(val, {
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:target => target,
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:output => output,
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:eval_string => eval_string,
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:pry_instance => self
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})
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# set a temporary (just so we can inject the value we want into eval_string)
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Thread.current[:__pry_cmd_result__] = result
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# note that `result` wraps the result of command processing; if a
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# command was matched and invoked then `result.command?` returns true,
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# otherwise it returns false.
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if result.command?
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if !result.void_command?
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# the command that was invoked was non-void (had a return value) and so we make
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# the value of the current expression equal to the return value
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# of the command.
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eval_string.replace "Thread.current[:__pry_cmd_result__].retval\n"
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end
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true
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else
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false
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end
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end
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# Run the specified command.
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# @param [String] val The command (and its params) to execute.
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# @param [String] eval_string The current input buffer.
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# @param [Binding] target The binding to use..
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# @return [Pry::Command::VOID_VALUE]
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# @example
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# pry_instance.run_command("ls -m")
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def run_command(val, eval_string = "", target = binding_stack.last)
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commands.process_line(val,
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:eval_string => eval_string,
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:target => target,
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:pry_instance => self,
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:output => output
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)
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Pry::Command::VOID_VALUE
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end
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# Execute the specified hook.
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# @param [Symbol] name The hook name to execute
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# @param [*Object] args The arguments to pass to the hook
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# @return [Object, Exception] The return value of the hook or the exception raised
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#
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# If executing a hook raises an exception, we log that and then continue sucessfully.
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# To debug such errors, use the global variable $pry_hook_error, which is set as a
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# result.
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def exec_hook(name, *args, &block)
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e_before = hooks.errors.size
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hooks.exec_hook(name, *args, &block).tap do
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hooks.errors[e_before..-1].each do |e|
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output.puts "#{name} hook failed: #{e.class}: #{e.message}"
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output.puts "#{e.backtrace.first}"
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output.puts "(see _pry_.hooks.errors to debug)"
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end
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end
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end
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# Set the last result of an eval.
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# This method should not need to be invoked directly.
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# @param [Object] result The result.
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# @param [Binding] target The binding to set `_` on.
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# @param [String] code The code that was run.
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def set_last_result(result, target, code="")
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@last_result_is_exception = false
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@output_array << result
|
|
|
|
self.last_result = result unless code =~ /\A\s*\z/
|
|
end
|
|
|
|
# Set the last exception for a session.
|
|
# @param [Exception] ex
|
|
def last_exception=(ex)
|
|
class << ex
|
|
attr_accessor :file, :line, :bt_index
|
|
def bt_source_location_for(index)
|
|
backtrace[index] =~ /(.*):(\d+)/
|
|
[$1, $2.to_i]
|
|
end
|
|
|
|
def inc_bt_index
|
|
@bt_index = (@bt_index + 1) % backtrace.size
|
|
end
|
|
end
|
|
|
|
ex.bt_index = 0
|
|
ex.file, ex.line = ex.bt_source_location_for(0)
|
|
|
|
@last_result_is_exception = true
|
|
@output_array << ex
|
|
@last_exception = ex
|
|
end
|
|
|
|
# Update Pry's internal state after evalling code.
|
|
# This method should not need to be invoked directly.
|
|
# @param [String] code The code we just eval'd
|
|
def update_input_history(code)
|
|
# Always push to the @input_array as the @output_array is always pushed to.
|
|
@input_array << code
|
|
if code
|
|
Pry.line_buffer.push(*code.each_line)
|
|
Pry.current_line += code.each_line.count
|
|
end
|
|
end
|
|
|
|
# @return [Boolean] True if the last result is an exception that was raised,
|
|
# as opposed to simply an instance of Exception (like the result of
|
|
# Exception.new)
|
|
def last_result_is_exception?
|
|
@last_result_is_exception
|
|
end
|
|
|
|
# Manage switching of input objects on encountering EOFErrors
|
|
def handle_read_errors
|
|
should_retry = true
|
|
exception_count = 0
|
|
begin
|
|
yield
|
|
rescue EOFError
|
|
if input_stack.empty?
|
|
self.input = Pry.config.input
|
|
if !should_retry
|
|
output.puts "Error: Pry ran out of things to read from! Attempting to break out of REPL."
|
|
throw(:breakout)
|
|
end
|
|
should_retry = false
|
|
else
|
|
self.input = input_stack.pop
|
|
end
|
|
|
|
retry
|
|
|
|
# Interrupts are handled in r() because they need to tweak eval_string
|
|
# TODO: Refactor this baby.
|
|
rescue Interrupt
|
|
raise
|
|
|
|
# If we get a random error when trying to read a line we don't want to automatically
|
|
# retry, as the user will see a lot of error messages scroll past and be unable to do
|
|
# anything about it.
|
|
rescue RescuableException => e
|
|
puts "Error: #{e.message}"
|
|
output.puts e.backtrace
|
|
exception_count += 1
|
|
if exception_count < 5
|
|
retry
|
|
end
|
|
puts "FATAL: Pry failed to get user input using `#{input}`."
|
|
puts "To fix this you may be able to pass input and output file descriptors to pry directly. e.g."
|
|
puts " Pry.config.input = STDIN"
|
|
puts " Pry.config.output = STDOUT"
|
|
puts " binding.pry"
|
|
throw(:breakout)
|
|
end
|
|
end
|
|
private :handle_read_errors
|
|
|
|
# Returns the next line of input to be used by the pry instance.
|
|
# This method should not need to be invoked directly.
|
|
# @param [String] current_prompt The prompt to use for input.
|
|
# @return [String] The next line of input.
|
|
def readline(current_prompt="> ", completion_proc=nil)
|
|
handle_read_errors do
|
|
|
|
if defined? Coolline and input.is_a? Coolline
|
|
input.completion_proc = proc do |cool|
|
|
completions = completion_proc.call cool.completed_word
|
|
completions.compact
|
|
end
|
|
elsif input.respond_to? :completion_proc=
|
|
input.completion_proc = completion_proc
|
|
end
|
|
|
|
if input == Readline
|
|
input.readline(current_prompt, false) # false since we'll add it manually
|
|
elsif defined? Coolline and input.is_a? Coolline
|
|
input.readline(current_prompt)
|
|
else
|
|
if input.method(:readline).arity == 1
|
|
input.readline(current_prompt)
|
|
else
|
|
input.readline
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
# Whether the print proc should be invoked.
|
|
# Currently only invoked if the output is not suppressed.
|
|
# @return [Boolean] Whether the print proc should be invoked.
|
|
def should_print?
|
|
!@suppress_output
|
|
end
|
|
|
|
# Returns the appropriate prompt to use.
|
|
# This method should not need to be invoked directly.
|
|
# @param [String] eval_string The current input buffer.
|
|
# @param [Binding] target The target Binding of the Pry session.
|
|
# @return [String] The prompt.
|
|
def select_prompt(eval_string, target)
|
|
target_self = target.eval('self')
|
|
|
|
open_token = @indent.open_delimiters.any? ? @indent.open_delimiters.last :
|
|
@indent.stack.last
|
|
|
|
c = OpenStruct.new(
|
|
:object => target_self,
|
|
:nesting_level => binding_stack.size - 1,
|
|
:open_token => open_token,
|
|
:session_line => Pry.history.session_line_count + 1,
|
|
:history_line => Pry.history.history_line_count + 1,
|
|
:expr_number => input_array.count,
|
|
:_pry_ => self,
|
|
:binding_stack => binding_stack,
|
|
:input_array => input_array,
|
|
:eval_string => eval_string,
|
|
:cont => !eval_string.empty?)
|
|
|
|
Pry.critical_section do
|
|
# If input buffer is empty then use normal prompt
|
|
if eval_string.empty?
|
|
generate_prompt(Array(prompt).first, c)
|
|
|
|
# Otherwise use the wait prompt (indicating multi-line expression)
|
|
else
|
|
generate_prompt(Array(prompt).last, c)
|
|
end
|
|
end
|
|
end
|
|
|
|
def generate_prompt(prompt_proc, conf)
|
|
if prompt_proc.arity == 1
|
|
prompt_proc.call(conf)
|
|
else
|
|
prompt_proc.call(conf.object, conf.nesting_level, conf._pry_)
|
|
end
|
|
end
|
|
private :generate_prompt
|
|
|
|
# the array that the prompt stack is stored in
|
|
def prompt_stack
|
|
@prompt_stack ||= Array.new
|
|
end
|
|
private :prompt_stack
|
|
|
|
# Pushes the current prompt onto a stack that it can be restored from later.
|
|
# Use this if you wish to temporarily change the prompt.
|
|
# @param [Array<Proc>] new_prompt
|
|
# @return [Array<Proc>] new_prompt
|
|
# @example
|
|
# new_prompt = [ proc { '>' }, proc { '>>' } ]
|
|
# push_prompt(new_prompt) # => new_prompt
|
|
def push_prompt(new_prompt)
|
|
prompt_stack.push new_prompt
|
|
end
|
|
|
|
# Pops the current prompt off of the prompt stack.
|
|
# If the prompt you are popping is the last prompt, it will not be popped.
|
|
# Use this to restore the previous prompt.
|
|
# @return [Array<Proc>] Prompt being popped.
|
|
# @example
|
|
# prompt1 = [ proc { '>' }, proc { '>>' } ]
|
|
# prompt2 = [ proc { '$' }, proc { '>' } ]
|
|
# pry = Pry.new :prompt => prompt1
|
|
# pry.push_prompt(prompt2)
|
|
# pry.pop_prompt # => prompt2
|
|
# pry.pop_prompt # => prompt1
|
|
# pry.pop_prompt # => prompt1
|
|
def pop_prompt
|
|
prompt_stack.size > 1 ? prompt_stack.pop : prompt
|
|
end
|
|
|
|
# Raise an exception out of Pry.
|
|
#
|
|
# See Kernel#raise for documentation of parameters.
|
|
# See rb_make_exception for the inbuilt implementation.
|
|
#
|
|
# This is necessary so that the raise-up command can tell the
|
|
# difference between an exception the user has decided to raise,
|
|
# and a mistake in specifying that exception.
|
|
#
|
|
# (i.e. raise-up RunThymeError.new should not be the same as
|
|
# raise-up NameError, "unititialized constant RunThymeError")
|
|
#
|
|
def raise_up_common(force, *args)
|
|
exception = if args == []
|
|
last_exception || RuntimeError.new
|
|
elsif args.length == 1 && args.first.is_a?(String)
|
|
RuntimeError.new(args.first)
|
|
elsif args.length > 3
|
|
raise ArgumentError, "wrong number of arguments"
|
|
elsif !args.first.respond_to?(:exception)
|
|
raise TypeError, "exception class/object expected"
|
|
elsif args.length === 1
|
|
args.first.exception
|
|
else
|
|
args.first.exception(args[1])
|
|
end
|
|
|
|
raise TypeError, "exception object expected" unless exception.is_a? Exception
|
|
|
|
exception.set_backtrace(args.length === 3 ? args[2] : caller(1))
|
|
|
|
if force || binding_stack.one?
|
|
binding_stack.clear
|
|
throw :raise_up, exception
|
|
else
|
|
binding_stack.pop
|
|
raise exception
|
|
end
|
|
end
|
|
def raise_up(*args); raise_up_common(false, *args); end
|
|
def raise_up!(*args); raise_up_common(true, *args); end
|
|
end
|