Implement explanation of a specific file from a GitHub repository

[calchiwo]

Add a flag to generate an explanation for a specific file directly from a GitHub repository.

Example:

explainthisrepo facebook/react/packages/react/src/index.js

Implementation idea:

• Detect paths in the form

owner/repo/path/to/file

• Fetch file using the GitHub API:

GET /repos/{owner}/{repo}/contents/path/to/file

Example:

GET /repos/{owner}/{repo}/contents/packages/react/src/index.js

Then

• Decode the returned base64 file content
• Generate an explanation for the file

This would allow analyzing individual files without cloning the repository.