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38 lines
728 B
Lua
38 lines
728 B
Lua
-- trace assigments to global variables
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do
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-- a tostring that quotes strings. note the use of the original tostring.
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local _tostring=tostring
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local tostring=function(a)
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if type(a)=="string" then
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return string.format("%q",a)
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else
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return _tostring(a)
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end
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end
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local log=function (name,old,new)
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local t=debug.getinfo(3,"Sl")
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local line=t.currentline
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io.write(t.short_src)
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if line>=0 then io.write(":",line) end
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io.write(": ",name," is now ",tostring(new)," (was ",tostring(old),")","\n")
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end
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local g={}
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local set=function (t,name,value)
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log(name,g[name],value)
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g[name]=value
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end
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setmetatable(getfenv(),{__index=g,__newindex=set})
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end
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-- an example
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a=1
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b=2
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a=10
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b=20
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b=nil
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b=200
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print(a,b,c)
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