Quick hack for checkout git branches into different directories (for when I'm actively working on different branches and want different working directories)

goto-branch.sh

# Working on lots of different branches of different repos
# has been a pain lately, especially when trying to address
# issues in multiple branches at once.

GOTO_BRANCH_DIR="$HOME/.goto-branch"
GOTO_BRANCH_REPOS="$GOTO_BRANCH_DIR/repos"
GOTO_BRANCH_BRANCHES="$GOTO_BRANCH_DIR/branches"

_goto-branch_usage() {
	echo "Usage: goto-branch repo-name [branch-name | master]"
	echo
	echo "Available repos:"
	cd "$GOTO_BRANCH_REPOS"
	for repo in *; do
		cd "$GOTO_BRANCH_REPOS/$repo"
		origin_url="`git config --get remote.origin.url`"
		echo " - `basename $repo` ($origin_url)"
	done
}
_goto-branch-init_usage() {
	echo "Usage: goto-branch-init repo-name git://git-url"
}

_goto-branch_uninitialized-repo() {
	echo "Unknown repo: $1"
	echo "Initialize new repos using git-branch-init."
	_goto-branch-init_usage
}

goto-branch-init() {
	repo_name="$1"
	repo_url="$2"
	if [[ -z "$repo_name" || -z "$repo_url" ]]; then
		_goto-branch-init_usage
		return
	fi

	repo_dir="$GOTO_BRANCH_REPOS/$repo_name"
	if [[ -d "$repo_dir" ]]; then
		echo "Repo already initialized: $repo_dir"
		return
	fi

	(
		mkdir -pv "$GOTO_BRANCH_REPOS"
		cd "$GOTO_BRANCH_REPOS"
		git clone "$repo_url" "$repo_name"
		if [[ -d "$repo_dir" ]]; then
			echo "Initialized repo: $repo_dir"
		fi
	)
}

# main()
goto-branch() {
	repo_name="$1"
	if [[ -z "$repo_name" ]]; then
		_goto-branch_usage
		return
	fi

	branch_name="master"
	if [[ -n "$2" ]]; then
		branch_name="$2"
	fi

	# Have we initialized this repo?
	repo_dir="$GOTO_BRANCH_REPOS/$repo_name"
	if [[ ! -d "$repo_dir" ]]; then
		_goto-branch_uninitialized-repo "$repo_name"
		return
	fi

	# Have we checked out this branch from this repo?
	branch_dir="$GOTO_BRANCH_BRANCHES/$repo_name/$branch_name"
	if [[ ! -d "$branch_dir" ]]; then
		(
			# Run a fetch on main repo to keep its DB somewhat up-to-date
			cd "$repo_dir"
			git fetch

			# Copy the main repo to a new directory for this branch
			mkdir -pv "$GOTO_BRANCH_BRANCHES/$repo_name"
			cp -r "$repo_dir" "$branch_dir"

			if [[ -d "$branch_dir" ]]; then
				cd "$branch_dir"
				git checkout "$branch_name"
				echo "Initialized branch: $branch_dir"
			fi
		)
	fi

	if [[ -d "$branch_dir" ]]; then
		cd "$branch_dir"
	else
		echo "[ERROR] Branch not checkout out? Expected: $branch_dir"
	fi
}