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contexts - Is there a way to find out who is importing a package?


After calling some functions, if I look into $ContextPath, I can see that JLink` is in there. Is there a way to find out what sequence of functions calls (like a stack-trace) imported a particular package?


Something like FuncA called FuncB which called FuncD which executed Needs["JLink`"]



Answer




Well, here is a suggestion: you can overload Needs using Villegas-Gayley trick. To do this safely, here is a generator for local environments, where Needs will be overloaded:


createTraceEnvironment[context_String]:=
Module[{inNeeds},
Function[
code,
Internal`InheritedBlock[
{Needs},
Unprotect[Needs];
Needs[context]/;!TrueQ[inNeeds]:=
Block[{inNeeds=True},

Print[Stack[_][[3;;-5]]];Needs[context]
];
Protect[Needs];
code
],
HoldAll
]
];

Now here is how it can be used: first create a local environment for "JLink`":



env = createTraceEnvironment["JLink`"];

Now it can be used, for example:


env[Needs["DatabaseLink`"]]


{
Needs[DatabaseLink`],
< <
< < Needs[JLink`];
}

But loading packages (or executing other code) which load "JLink`", without the local environment, will go as usual. For example, RLink also loads JLink, but here nothing is printed:


Needs["RLink`"] 

(* Null *)

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