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-rw-r--r--deps/lua/test/trace-globals.lua38
1 files changed, 38 insertions, 0 deletions
diff --git a/deps/lua/test/trace-globals.lua b/deps/lua/test/trace-globals.lua
new file mode 100644
index 0000000..295e670
--- /dev/null
+++ b/deps/lua/test/trace-globals.lua
@@ -0,0 +1,38 @@
+-- trace assigments to global variables
+
+do
+ -- a tostring that quotes strings. note the use of the original tostring.
+ local _tostring=tostring
+ local tostring=function(a)
+ if type(a)=="string" then
+ return string.format("%q",a)
+ else
+ return _tostring(a)
+ end
+ end
+
+ local log=function (name,old,new)
+ local t=debug.getinfo(3,"Sl")
+ local line=t.currentline
+ io.write(t.short_src)
+ if line>=0 then io.write(":",line) end
+ io.write(": ",name," is now ",tostring(new)," (was ",tostring(old),")","\n")
+ end
+
+ local g={}
+ local set=function (t,name,value)
+ log(name,g[name],value)
+ g[name]=value
+ end
+ setmetatable(getfenv(),{__index=g,__newindex=set})
+end
+
+-- an example
+
+a=1
+b=2
+a=10
+b=20
+b=nil
+b=200
+print(a,b,c)