Remember bash directories

_DIRS_DIRS=~/.dirs

# Silently make sure ~/.dirs exists
\mkdir -p $_DIRS_DIRS

_DIRS_FILE=$_DIRS_DIRS/$BASH_SESSION_ID

save_dirs() {
    \dirs -l -p > $_DIRS_FILE
}

load_dirs() {
    # Start out with a fresh directory stack.
    \dirs -c

    # Make sure there's at least an empty file.
    if [[ ! -f "$_DIRS_FILE" ]]; then
        touch $_DIRS_FILE
    fi

    # Start out in the directory we left off at
    for dir in $(cat $_DIRS_FILE) ; do
        \cd $dir  > /dev/null 2>&1

        # Just need the first line
        break
    done

    # Restore saved dir stack in reverse order.
    for dir in $(cat $_DIRS_FILE | tac) ; do
        # But don't duplicate the directory we left off at
        if [[ $PWD != $dir ]]; then
            \pushd -n $dir > /dev/null 2>&1
        fi
    done
}

# NOTE: aliases can't take parameters, so we have to alias to functions.

_dirs_pushd()
{
    \pushd "$@"
    save_dirs
}
alias pushd=_dirs_pushd

_dirs_popd()
{
    \popd "$@"
    save_dirs
}
alias popd=_dirs_popd

# In case 'dirs -c' is used.
_dirs_dirs()
{
    \dirs "$@"
    save_dirs
}
alias dirs=_dirs_dirs