#!/bin/bash
# Mount a partition by label or device identifier automatically
# Includes interactive selection if no argument is given
set -eo pipefail
_help="$0 <device> [mountpoint] [options...]"
case $1 in
  (-v) shift
    bash -x "$0" "$@";;
  ("") # TODO include size
    arg=$(
      {
        #for ip in $(sudo nmblookup -S \* | grep '^[0-9]' | cut -d' ' -f1)
        #do timeout --kill-after=.1s .1s showmount --no-headers --exports "$ip" 2>/dev/null | sed "s|\([^ ]*\) .*|$ip:\1|"
        #done &
        # TODO handle labels with spaces
        lsblk --list --noheadings --output name,label,fstype,mountpoint | grep -v LUKS | grep -v '/' | grep ".\+ [^ ]\+";
      } | fzf --exit-0 | sed "s/^\([^ ]\+ \+\)\?\([^ ]\+\) \+[^ ]\+ *$/\2/"
    );;
  (--help) echo "$_help" && exit 0;;
  (-u) shift
    for last; do true; done
    sudo umount --verbose "$@"
    code=$?
    sudo rm -df "$last"
    exit $code;;
  (*) arg=$1
    shift;;
esac

# FILE as loopback device
if test -f "$arg"
then loopdevice="$(sudo losetup -f)"
     if sudo losetup -P -v "$loopdevice" "$arg"
     then $0 "$loopdevice" ||
          { sudo vgchange -ay &&
          sudo pvs | grep "$loopdevice" | awk '{print $2}' | xargs -I% find /dev/% -mindepth 1 -exec sudo sh -c 'dir=/mnt/$(echo "{}" | sed "s|/dev/||;s|/|-|g") && mkdir -vp "$dir" && mount {} "$dir"' \; ; }
          exit $?
     fi
fi

# FSTAB: BY LABEL
if grep --word-regexp "LABEL=$arg" /etc/fstab
then # have to mount twice as the first one might be creating the directory
  mount -L "$arg" "$@" 2>/dev/null || mount -L "$arg" "$@"
  exit $?
fi
# FSTAB: BY MOUNTPOINT/NAME
if grep --word-regexp "$arg" /etc/fstab
then mount "$arg" "$@"; exit $?
fi

# MANUALLY
mountpoint="${2:-${MNT:-${XDG_RUNTIME_DIR}/mnt}/$(basename "$arg")}"
if grep -e "[^\w=/]$mountpoint[^\w/]" /etc/fstab
then test $# -gt 0 && shift
   mount "$mountpoint" "$@"
   code=$?
   cd $mountpoint
   exit $code
fi
case "$arg" in
  (sd*|loop*|nvme*|mm*|md*|dm*|vg*) partition="/dev/$arg";;
  (/dev/*) partition="$arg";;
  (*) params="-L"
        partition="$arg";;
esac
shift $(expr 2 \& $# \> 2 \| $#)
#uid=$(id --user),gid=$(id --group), \
if ! mountpoint "$mountpoint" 2>/dev/null
then mp="/run/media/$USER/$arg" && test -e "$mp" && mountpoint="$mp"
  sudo mount -vo users,X-mount.mkdir,noatime,umask=003,gid=users,uid=$USER $params "$partition" "$mountpoint" "$@" ||
    sudo mount -vo users,X-mount.mkdir,noatime $params "$partition" "$mountpoint" "$@"
fi
cd $mountpoint
df -x tmpfs -x devtmpfs -x squashfs --human-readable
exec $SHELL