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  1. -- reads luac listings and reports global variable usage
  2. -- lines where a global is written to are marked with "*"
  3. -- typical usage: luac -p -l file.lua | lua globals.lua | sort | lua table.lua
  4.  
  5. while 1 do
  6.  local s=io.read()
  7.  if s==nil then break end
  8.  local ok,_,l,op,g=string.find(s,"%[%-?(%d*)%]%s*([GS])ETGLOBAL.-;%s+(.*)$")
  9.  if ok then
  10.   if op=="S" then op="*" else op="" end
  11.   io.write(g,"\t",l,op,"\n")
  12.  end
  13. end
  14.