70 lines
2.5 KiB
Ruby
70 lines
2.5 KiB
Ruby
class Pry
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# A class to manage the loading of files through the REPL loop.
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# This is an interesting trick as it processes your file as if it
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# was user input in an interactive session. As a result, all Pry
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# commands are available, and they are executed non-interactively. Furthermore
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# the session becomes interactive when the repl loop processes a
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# 'make-interactive' command in the file. The session also becomes
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# interactive when an exception is encountered, enabling you to fix
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# the error before returning to non-interactive processing with the
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# 'make-non-interactive' command.
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class REPLFileLoader
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def initialize(file_name)
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full_name = File.expand_path(file_name)
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raise RuntimeError, "No such file: #{full_name}" if !File.exists?(full_name)
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define_additional_commands
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@content = File.read(full_name)
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end
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# Switch to interactive mode, i.e take input from the user
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# and use the regular print and exception handlers.
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# @param [Pry] _pry_ the Pry instance to make interactive.
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def interactive_mode(_pry_)
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_pry_.input = Pry.config.input
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_pry_.print = Pry.config.print
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_pry_.exception_handler = Pry.config.exception_handler
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Pry::REPL.new(_pry_).start
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end
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# Switch to non-interactive mode. Essentially
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# this means there is no result output
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# and that the session becomes interactive when an exception is encountered.
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# @param [Pry] _pry_ the Pry instance to make non-interactive.
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def non_interactive_mode(_pry_, content)
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_pry_.print = proc {}
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_pry_.exception_handler = proc do |o, e, _p_|
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_p_.run_command "cat --ex"
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o.puts "...exception encountered, going interactive!"
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interactive_mode(_pry_)
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end
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content.lines.each do |line|
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break unless _pry_.eval line, :generated => true
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end
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end
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# Define a few extra commands useful for flipping back & forth
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# between interactive/non-interactive modes
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def define_additional_commands
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s = self
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Pry::Commands.command "make-interactive", "Make the session interactive" do
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s.interactive_mode(_pry_)
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end
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Pry::Commands.command "load-file", "Load another file through the repl" do |file_name|
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s.non_interactive_mode(_pry_, File.read(File.expand_path(file_name)))
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end
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end
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# Actually load the file through the REPL by setting file content
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# as the REPL input stream.
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def load
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non_interactive_mode(Pry.new, @content)
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end
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end
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end
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