Source file not found for magics

[fperez]

After the refactoring of the magics, the display of their source files stopped working:

Type:       Magic function
Base Class: <type 'instancemethod'>
String Form:<bound method ExecutionMagics.run of <IPython.core.magics.execution.ExecutionMagics object at 0x90daf2c>>
Namespace:  IPython internal
File:       Dynamically generated function. No source code available.

[fperez]

The problem is that these magics are now created via a decorator, and we need to introspect into that in order to find the source file.

[takluyver]

If the decorator sets the __wrapped__ attribute on the functions it creates, our introspection should go and look that up.

[fperez]

Yup, that's what we need to do. Haven't had the chance to write the code yet, so feel free to beat me to the punch :)

[bfroehle]

I don't seem to be able to reproduce this. :(

[fperez]

@bfroehle, what do you get if you type run? in a plain ipython? Specifically, what does the 'file' field say for you? In my case it's:

File:       Dynamically generated function. No source code available.

and that's the problem. It should be able to find it...

[bfroehle]

@fperez: Aha, yes, it says "No source code available."

But run?? does produce a listing of the source:

String Form:<bound method ExecutionMagics.run of <IPython.core.magics.execution.ExecutionMagics object at 0x2e13990>>
Namespace:  IPython internal
File:       Dynamically generated function. No source code available.
Definition: run(self, parameter_s='', runner=None, file_finder=<function get_py_filename at 0x269b230>)
Source:
    @skip_doctest
    @line_magic
    def run(self, parameter_s='', runner=None,
                  file_finder=get_py_filename):
        """Run the named file inside IPython as a program.

        Usage:\\
          %run [-n -i -t [-N<N>] -d [-b<N>] -p [profile options]] file [args]

        Parameters after the filename are passed as command-line arguments to
        the program (put in sys.argv). Then, control returns to IPython's
        prompt.

        This is similar to running at a system prompt:\\
          $ python file args\\
        but with the advantage of giving you IPython's tracebacks, and of

[fperez]

Ah, ok, I do see that as well. But #1845 fixes everything to show the correct path (plus refactoring old code and adding tests).