nano-git - Git finally makes sense

1-hour implementation of Git inner essentials in Python. Watch YouTube video

Mental model:

Git - just files and folders in .git folder.

Usage:

python3 nano_git.py <command> <command_args>

Supported commads:

• init
• add
• commit
• log
• checkout

All commits hashes are shown as first 7 chars as in Git.

Not included for simplicity:

• branches (branch & checkout)
• merge
• diff
• rebase

Workflow example

python3 nano_git.py init
python3 nano_git.py add file1.txt
python3 nano_git.py commit "added file1.txt"
python3 nano_git.py log
python3 nano_git.py add file2.txt
python3 nano_git.py commit "added file2.txt"
python3 nano_git.py log
python3 nano_git.py checkout <hash>

Data structures

    blob = file contents

    index { file_path: blob_hash }

    commit { 
        hash: str,
        parent: parent_hash | None,
        tree: dict[file_path: str, blob_hash: str],
        message: str,
        timestamp: float
    }

Tech stack

• hashlib (SHA-1 hashes)
• sys (args handling)
• os (file/dirs handling)
• json (git data structures handling)
• time (commits timestamps)