Sync one's ~/.dotfiles with git & stow

dotfiles

#!/usr/bin/env sh
set -eu

# Base directory for dotfiles repository
REPO_DIR="$HOME/.dotfiles"

# Determine action (pull or push) and flags
ACTION=""
FORCE=""
for arg in "$@"; do
    case "$arg" in
        -f|--force)
            FORCE="1"
            ;;
        pull|push)
            ACTION="$arg"
            ;;
    esac
done

if [ "$ACTION" = "pull" ]; then
    if [ "$FORCE" = "1" ]; then
        # Forcefully sync local repository history and working tree with upstream
        git -C "$REPO_DIR" fetch || exit 1
        git -C "$REPO_DIR" reset --hard @{u} || exit 1
        git -C "$REPO_DIR" clean -fdx || exit 1
    else
        # Pull the latest files from git
        git -C "$REPO_DIR" pull || exit 1
    fi

    # Save current working directory
    OLDPWD="$PWD"

    # Change into repository directory
    cd "$REPO_DIR" || exit 1

    # Remove old stow links safely (if any)
    stow -D . 2>/dev/null || true

    # Apply stow links
    stow . || exit 1

    # Return to original working directory
    cd "$OLDPWD" || exit 1
elif [ "$ACTION" = "push" ]; then
    # Add, commit and push all files
    git -C "$REPO_DIR" add -A || exit 1

    # Commit if there are staged changes
    if ! git -C "$REPO_DIR" diff --cached --quiet; then
        git -C "$REPO_DIR" commit -m "chore: update" || exit 1
    fi

    if [ "$FORCE" = "1" ]; then
        # Forcefully overwrite remote history with local branch
        git -C "$REPO_DIR" push --force || exit 1
    else
        # Ensure upstream is configured and fail loudly if there is nothing to push
        git -C "$REPO_DIR" rev-parse --abbrev-ref --symbolic-full-name @{u} >/dev/null 2>&1 || exit 1
        if git -C "$REPO_DIR" rev-list @{u}..HEAD --quiet; then
            git -C "$REPO_DIR" push || exit 1
        else
            exit 1
        fi
    fi
else
    echo "Usage: $0 {pull|push} [-f|--force]" >&2
    exit 1
fi