git-top

#!/usr/bin/env bash
#
# Custom git command that returns the top of the project directory.
# This handles submodules stored at any depth.
#
# Author: Lucas Magasweran <lrm@linux.com>
#
# Start from the current directory
current_dir=$(pwd)

# Initialize a variable to store the last directory with .git
last_git_dir=""

# Loop until we reach the root directory "/"
while [[ "$current_dir" != "/" ]]; do
    # Check if the current directory contains a .git directory or file
    if [[ -d "$current_dir/.git" || -f "$current_dir/.git" ]]; then
        last_git_dir="$current_dir"
    fi

    # Use 'git rev-parse' to jump from submodule to parent Git repo
    parent_dir=$(git -C "$current_dir" rev-parse --show-superproject-working-tree)

    # If 'git rev-parse' fails to return a parent directory, break the loop
    if [[ -z "$parent_dir" || "$parent_dir" == "$current_dir" ]]; then
        break
    fi

    current_dir="$parent_dir"
done

# Check if a .git directory or file was found
if [[ -n "$last_git_dir" ]]; then
    echo "$last_git_dir"
    exit 0
else
    exit 1
fi