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I like to use the variant of ShowIt for debugging purpose in Mathematica defined here https://stackoverflow.com/a/8270643/884752. I was reading again the idea of rcollyer to use messages for some functions to turn them on or off here https://stackoverflow.com/a/4211700/884752. And I'm asking myself if it would be possible to do something similar for ShowIt, but I didn't manage to. Does someone have any idea ? Thanks

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faysou
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1 Answers1

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If I understand your intention:

debug::ShowIt = "`1`";
SetAttributes[System`ShowIt, HoldAll];
System`ShowIt[code__] := System`ShowIt[{code}];
System`ShowIt[code_] :=
  With[{y = code},
    Message[debug::ShowIt, HoldForm[code = y]];
    y
  ];

In[5]:= ShowIt[2 + 2]

During evaluation of In[5]:= debug::ShowIt: 2 + 2 = 4

Out[5]= 4

In[6]:= Off[debug::ShowIt]
        ShowIt[2 + 2]

Out[7]= 4
Mr.Wizard
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  • Thank you, this is what I wanted. I cannot convert the output of the debug message to an input format like I do for the original ShowIt. Is there a way to circumvent this? – faysou Jan 15 '12 at 11:27
  • @Faysal, I don't know. I'll make an attempt tomorrow. – Mr.Wizard Jan 15 '12 at 15:35