irbrc.rb

history and history-grep fns

 def history(num=100)
     h = Readline::HISTORY.to_a
     start = [0,h.size-num-1].max
     h.zip((0..h.size).to_a)[start...h.size].each do |e,i| 
       puts " #{(i).to_s.rjust(4)}  #{e}"
  end;nil
 end
 def hg(term)
     num=500
     h = Readline::HISTORY.to_a
     start = [0,h.size-num-1].max
     h.zip((0..h.size).to_a)[start...h.size].each do |e,i| 
       puts " #{(i).to_s.rjust(4)}  #{e}" if e =~ /#{term}/
  end;nil
 end