Script I ran to parse a `pretty_inspect` output that was 84k lines long and show me the path to the lines of interest

parsing_pretty_inspect.sh

ruby < omg -r coderay -lne '
   BEGIN {
     target  = /DefaultTrailApplicability/ # needle
     stack   = []                          # haystack
     results = []
     indentation = -> line { line.to_s[/\A\s*/].size }
     String.class_eval { attr_accessor :lineno }
   }

   $_.lineno = $.   # each line tracks its line number

   (stack.pop; stack.push $_) if indentation[stack.last] == indentation[$_]
   stack.push $_              if indentation[stack.last] <  indentation[$_]
   stack.pop               while indentation[stack.last] >  indentation[$_]

   results, stack = [*results, *stack], [] if ~target

   END {
     lineno_width = results.last&.lineno.to_s.size * 4 / 3
     code = CodeRay.encode results.join("\n"), :ruby, :terminal  # syntax highlight results
     code.gsub! target, "\e[47m\\\\&\e[0m"                       # highlight matches w/ white bg
     results.map(&:lineno).zip(code.lines) do |lineno, line|
       pretty_lineno = lineno.to_s.gsub /(?<=\d)(?=\d{3}+\b)/, ",\\\\&"
       puts "#{pretty_lineno.rjust lineno_width} | #{line}"
     end
   }'