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edaa1383f2
This change brings some order to how we require files. Previously, we required app files from everywhere, including pry.rb. Now we require app files only from pry.rb. External and stdlib dependencies are required at places where they're used, not globally.
108 lines
3.4 KiB
Ruby
108 lines
3.4 KiB
Ruby
class Pry
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class Command
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class WatchExpression < Pry::ClassCommand
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match 'watch'
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group 'Context'
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description 'Watch the value of an expression and print a notification ' \
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'whenever it changes.'
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command_options use_prefix: false
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banner <<-'BANNER'
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Usage: watch [EXPRESSION]
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watch
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watch --delete [INDEX]
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watch [EXPRESSION] adds an expression to the list of those being watched.
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It will be re-evaluated every time you hit enter in pry. If its value has
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changed, the new value will be printed to the console.
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This is useful if you are step-through debugging and want to see how
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something changes over time. It's also useful if you're trying to write
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a method inside pry and want to check that it gives the right answers
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every time you redefine it.
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watch on its own displays all the currently watched expressions and their
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values, and watch --delete [INDEX] allows you to delete expressions from
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the list being watched.
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BANNER
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def options(opt)
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opt.on :d, :delete,
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"Delete the watch expression with the given index. If no index " \
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"is given; clear all watch expressions.",
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optional_argument: true, as: Integer
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opt.on :l, :list,
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"Show all current watch expressions and their values. Calling " \
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"watch with no expressions or options will also show the watch " \
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"expressions."
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end
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def process
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if opts.present?(:delete)
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delete opts[:delete]
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elsif opts.present?(:list) || args.empty?
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list
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else
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add_hook
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add_expression(args)
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end
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end
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private
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def expressions
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_pry_.config.watch_expressions ||= []
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end
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def delete(index)
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if index
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output.puts "Deleting watch expression ##{index}: #{expressions[index - 1]}"
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expressions.delete_at(index - 1)
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else
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output.puts "Deleting all watched expressions"
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expressions.clear
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end
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end
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def list
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if expressions.empty?
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output.puts "No watched expressions"
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else
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_pry_.pager.open do |pager|
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pager.puts "Listing all watched expressions:"
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pager.puts ""
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expressions.each_with_index do |expr, index|
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pager.print with_line_numbers(expr.to_s, index + 1)
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end
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pager.puts ""
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end
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end
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end
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def eval_and_print_changed(output)
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expressions.each do |expr|
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expr.eval!
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output.puts "#{blue 'watch'}: #{expr}" if expr.changed?
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end
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end
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# TODO: fix arguments.
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# https://github.com/pry/pry/commit/b031df2f2f5850ee6e9018f33d35f3485a9b0423
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def add_expression(_arguments)
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expressions << Expression.new(_pry_, target, arg_string)
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output.puts "Watching #{Code.new(arg_string).highlighted}"
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end
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def add_hook
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hook = [:after_eval, :watch_expression]
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unless _pry_.hooks.hook_exists?(*hook)
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_pry_.hooks.add_hook(*hook) do |_, _pry_|
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eval_and_print_changed _pry_.output
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end
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end
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end
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end
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Pry::Commands.add_command(Pry::Command::WatchExpression)
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end
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end
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