#!/usr/bin/env bash
#
# Copyright 2013 Victor Penso
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

VERSION=0.1


SCRIPT=${0##*/}

_error() { 
  echo 1>&2 "Error: $@"
  echo "See \`$SCRIPT help\` for usage."
  exit 1
}

HELP=\
"Usage: $SCRIPT command [arguments]

Commands:

  list 
    List all mounted directories.

  mount [user@]host:[path] [path] [options]
    Mount a remote directory to a local path.
  
  umount path
    Unmount remote directories."


# Check for dependencies
for cmd in sshfs ; do
  # If missing alert and exit
  type -p $cmd &>/dev/null || _error "Please install command [$cmd]." 
done

ssh_mount() {
  # at least to parameters are required
  test $# -lt 2 && _error "Missing arguments!" 
  local remote=$1 ; shift
  local path=$1 ; shift
  # create mount point  if missing, or exit on error
  ( test -d $path || mkdir -p $path ) || exit 1
  sshfs $remote $path -C -o reconnect,auto_cache,follow_symlinks "$@"
}

ssh_umount() {
  local path=$1
  # exit if user did not provide a mount point to umount
  test -z "$path" && _error "Missing path to mount point!" 
  # if mounted, umount
  ( mount | grep $path &>/dev/null ) && fusermount -u $path
}

# Read the command-line arguments
_command=$1 ; shift
case "$_command" in
  "list") mount | grep fuse.sshfs | cut -d' ' -f-3 ;;
  "mount") ssh_mount "$@" ;;
  "umount") ssh_umount "$@" ;;
  *) echo "$HELP" ;;
esac

exit 0