Git checkout default branch and pull. Optionally create a new working branch

git-cod

#!/bin/bash

# Place this script in your path and make it executable

# Display the script's usage
display_usage() {
    echo "Git Checkout Default Script"
    echo "This git script will check out the default HEAD branch"
    echo "and pull the latest from the remote. Optionally it will"
    echo "create a new branch ready for you to work on."
    echo "Usage: git cod [options]"
    echo "Options:"
    echo "  -b, --branch <branch-name>   Checkout a new branch"
    echo "  -h, --help                   Display this help message"
}

# Get the HEAD branch name from the Git remote show command
# Typically this will be 'main' or 'master'
branch=$(git remote show origin | grep HEAD | awk '{print $NF}')

# Checkout the branch
git checkout $branch

# Pull the latest changes from the remote repository
git pull origin $branch

# Check if any arguments are provided
if [[ $# -eq 0 ]]; then
    # No arguments provided, proceed with the default behavior
    echo "No additional options provided."
elif [[ "$1" == "-h" || "$1" == "--help" ]]; then
    # Display help message
    display_usage
    exit 0
elif [[ "$1" == "-b" || "$1" == "--branch" ]]; then
    # Check if a branch name is provided after the parameter
    if [[ -z "$2" ]]; then
        echo "Error: No branch name provided."
        exit 1
    fi
    # Checkout a new branch
    git checkout -b $2
else
    # Invalid option provided
    echo "Invalid option: $1"
    echo "Use --help to display usage."
    exit 1
fi