the first version and README

Nakilon · Feb 28, 2021 · a4477d5 · a4477d5
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diff --git a/README.md b/README.md
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 # Ruby line profiler
 
 I'll publish it as a gem. Maybe. Later.
 
 ## Usage
 
 ```bash
 ruby -r lineprofiler my_slow_program.rb
 ```
 
 On exit it will print something like this:
 
 ```none
 ...
         best = nil
         prev_time = nil
 88.97%  loop do
 84.14%    combinations.each do |f, set|
 48.97%      t = all.size.times.map do |i|
               [
                 all[i].cls,
 43.92%          all.values_at(*set-[i]).min_by{ |e| Math.s
               ]
             end
           end
  1.97%    combinations = pcbr.table.sort_by{ |_, _, score|
  1.97%      set.size.times.map do |i|
  1.31%        next if set.size < 3
  0.65%        next if pcbr.set.include? [f, key]
               [f, key]
             end
  2.60%    end.drop_while(&:empty?).first
           break if Time.now - prev_time > 10
 ...
 ```
diff --git a/lib/lineprofiler.rb b/lib/lineprofiler.rb
@@ -0,0  1,16 @@
 profile = []
 Thread.abort_on_exception = true
 Thread.new do
   loop do
     profile.push Thread.main.backtrace_locations.map{ |loc| [loc.absolute_path, loc.lineno] }
     sleep 0.01
   end
 end
 END {
   File.foreach($0).with_index do |line, i|
     v = profile.count do |bt|
       bt.include? [File.expand_path($0), i   1]
     end.fdiv(profile.size).round(4) * 100
     puts "%-8s%s" % [("%5.2f%%" % v unless v.zero?).to_s, line[0,50]]
   end
 }