#!/usr/bin/env bash
# mencfs --- encfs wrapper for command line convenience
# Author: Noah Friedman <friedman@splode.com>
# Created: 2017-04-18
# Public domain.

# $Id: mencfs,v 1.2 2018/01/15 21:29:47 friedman Exp $

# Commentary:

# encfs requires fully-qualified pathnames, so this fully-qualifies the
# directory arguments.  It assumes that the source directory will be of the
# form foo.enc and will append .enc if missing.  Destination directory is
# optional and defaults to foo.

# Any mount options to encfs should go after the source and optional target directory.

# Code:

# Don't juse use "cd $1 && pwd" because destination might not exist yet.
fqpath()
{
    case $1 in
        ./*  ) echo "$PWD/${1#*/}"      ;;
        ../* ) echo "${PWD%/*}/${1#*/}" ;;
        /*   ) echo "$1"                ;;
        *    ) echo "$PWD${1:+/$1}"     ;;
    esac
}

err()
{
    echo "${0##*/}: $*" 1>&2
    exit 1
}

# This lets you write: apush arrayvar newval
# instead of: ${arrayvar[${#arrayvar[@]}]}=newval
# Because c'mon, you've got to be kidding me.
apush() { eval "$1=(\"\${$1[@]}\" \"\${@:2}\")"; }

main()
{
    case $# in
        0 ) echo "Usage: ${0##*/} rootDir [mountPoint] [options] [-- [FUSE Mount Options]]" 1>&2
            exit 1 ;;
    esac

    dstdir=${1%/}  # strip trailing /
    dstdir=`fqpath "${dstdir%.enc}"`
    srcdir=$dstdir.enc
    shift

    if ! [ -d "$srcdir" ]; then
        err "source $srcdir does not exist"
    fi

    case $1 in
        -* | '' )
            if ! [ -d "$dstdir" ]; then
                mkdir "$dstdir" || exit $?
            fi ;;
        * )
            dstdir=`fqpath "$1"`
            shift
            if ! [ -d "$dstdir" ]; then
                err "target $dstdir does not exist"
            fi ;;
    esac

    while :; do
        case $# in 0  ) break ;; esac
        case $1 in -- ) break ;; esac
        apush encfsopts "$1"
        shift
    done

    set -x
    exec encfs "${encfsopts[@]}" "$srcdir" "$dstdir" "$@"
}

main "$@"

# eof