git_daniel

This repo contains an implementation of a few git functionalities for self learning. As it's hosted in github and requires git features by itself, this git will work when invoking git_d.

Functionalities

git_d init

• Initialize a directory .git_d which would have the data structures that power git persisted in disk.

git_d add

• Add changes in a file to all of the staged files. If the file did not change since it's last state, will return this output

git_d commit -m ""

• Commit all of the staged changes to the working tree.

Project structure

git_daniel/
├── src/            # Shared source code (all .cpp and .h files)
├── windows/        # CMakeLists.txt for building on Windows
└── unix/           # CMakeLists.txt for building on macOS / Linux

The source code in src/ is shared across platforms. Platform-specific SHA-256 hashing is handled via preprocessor guards in CryptoUtils.cpp (Windows BCrypt, macOS CommonCrypto, Linux OpenSSL).

Requires C++23.

Building and running

macOS / Linux (Unix)

All commands are run from the repository root.

First-time setup (generates Makefiles)

cmake -S unix -B unix/build -DCMAKE_CXX_COMPILER=clang++

Build

cmake --build unix/build

Run

./unix/build/git_d

Linux note: OpenSSL development headers are required (libssl-dev on Debian/Ubuntu, openssl-devel on Fedora/RHEL).

Windows

All commands are run from the repository root.

First-time setup (generates Ninja build files)

cmake -S windows -B windows/build -G Ninja -DCMAKE_CXX_COMPILER=clang++

Build

cmake --build windows/build

Run

.\windows\build\git_d.exe

Debugging (macOS / Linux)

Requires the CodeLLDB extension in Cursor/VSCode.

One-time configure (debug symbols)

cmake -S unix -B unix/build -DCMAKE_BUILD_TYPE=Debug

Steps

1. Set a breakpoint by clicking in the gutter next to any line number.
2. Open Run & Debug (Cmd+Shift+D).
3. Select a configuration from the dropdown (e.g. Debug: add example) and press F5.
4. The binary will rebuild automatically then pause at your breakpoint.

Key	Action
F10	Step over
F11	Step into
Shift+F11	Step out
F5	Continue

To debug a different command or arguments, edit "args" in .vscode/launch.json.