Wrapper for gmt info

[leouieda]

Create a wrapper function for gmt info. Data input should be a file name data='some_file.txt'. Doesn't really make much sense to read in numpy arrays for this because most of it can be done using numpy functions.

See how other modules are wrapped, for example in gmt/base_plotting.py.

[seisman]

I'd like to implement it. Where to put this wrapper function? base_plotting.py is not a good choice.

[leouieda]

Yeah, I've been trying to come up with a good module structure for these. I think we can keep them in a gmt/modules.py for now. If it gets too large we'll split it up.

[leouieda]

@seisman sorry, I just realized that modules like gmt info that print things to stdout aren't very useful to us. We would need to capture the stdout output to a Python string so that we can return that to the user instead. I found this on stackoverflow that would work great implemented as a capture_stdout context manager on gmt/utils.py: https://stackoverflow.com/questions/24277488/in-python-how-to-capture-the-stdout-from-a-c-shared-library-to-a-variable

[leouieda]

A much simpler alternative would be to tell GMT to send the output to a temporary file which we read in later. This might be the better option actually. You can pass an argument ->FILE_NAME to a GMT module and it will write to FILE_NAME instead. Using a tempfile.NamedTemporaryFile would work great with this.