[add] Calculate disk usage of fetched model and display the same

[Riyabelle25]

Solves #7
Using the very handy GitHub API to get information about the model repo in question, then grepping the API response to simply show the size in KB.
My changes to achieve this are:

        import os

        url = "https://github.com/ersilia-os/{0}".format(model_id)
        cmd = "echo " + url + "| perl -ne 'print $1 if m!([^/]+/[^/]+?)(?:\.git)?$!' | xargs -I{} curl -s -k https://api.github.com/repos/'{}' | grep size"
        echo(
            "The disk storage of this model in KB is"
        )
        os.system(cmd) 

Attached herein is how the output looks currently:

[Riyabelle25]

Hi @miquelduranfrigola, do review my solution and let me know your thoughts.
This is a quick fix, as I have used the GitHub API before in previous open-source projects

[miquelduranfrigola]

Hi @Riyabelle25 - many thanks for this good first step. Is there a way to track the size of files stored in Git LFS through the GitHub API? I like your solution but, since big files are stored in Git LFS, those would be the most important to track.

[Riyabelle25]

GitHub API currently does not support tracking the size of the LFS files, though it is a feature request.

I have been exploring other solutions, and a tentative one would be:

1. cat the .gitattributes to get the file extension that would be tracked as LFS.
2. Iterate through the remote repo, find the files ending with that extension
3. grep through each file's content, for their listed size. (I read that pointer files have the size of the LFS file mentioned in them) For eg:
4. Add each size to get the total size.

outs:
- md5: 6781e0baec8d65b9a95a3e879a5098d1
  size: 800
  path: data.h5

An easier quick fix might be to use the GitHub API to search through the model's repo for pointer file instances and then add the sizes. Will look into this approach tomorrow

[miquelduranfrigola]

I am merging this PR (thanks!) as we still try to fix the Git LFS issue.

[Riyabelle25]

Thank you @miquelduranfrigola!