JezK

Edit File: tracevar.rb

# frozen_string_literal: true

require_relative "../command"

module Byebug
  #
  # Show (and possibily stop) at every line that changes a global variable.
  #
  class TracevarCommand < Command
    def self.regexp
      /^\s* tr(?:acevar)? (?: \s+ (\S+))?  # (variable-name)?
                          (?: \s+ (stop|nostop))?
       \s*$/x
    end

def self.description
      <<-DESCRIPTION
        tr[acevar] <variable> [[no]stop]

#{short_description}

If "stop" is specified, execution will stop every time the variable
        changes its value. If nothing or "nostop" is specified, execution won't
        stop, changes will just be logged in byebug's output.
      DESCRIPTION
    end

def self.short_description
      "Enables tracing of a global variable"
    end

def execute
      var = @match[1]
      return errmsg(pr("trace.errors.needs_global_variable")) unless var
      return errmsg(pr("trace.errors.var_is_not_global", name: var)) unless global_variables.include?(:"#{var}")

stop = @match[2] && @match[2] !~ /nostop/

instance_eval do
        trace_var(:"#{var}") { |val| on_change(var, val, stop) }
      end

puts pr("trace.messages.success", var: var)
    end

private

def on_change(name, value, stop)
      puts pr("trace.messages.on_change", name: name, value: value)

context.step_out(1, false) if stop
    end
  end
end

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