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#!/bin/bash

IFS='
'
# Function for escaping cell-phone names.
escape() { echo "$@" | iconv -cf UTF-8 -t ASCII//TRANSLIT | tr -d '[:punct:]' | tr '[:upper:]' '[:lower:]' | tr ' ' '-' | sed "s/-\+/-/g;s/\(^-\|-\$\)//g"; }

# Check for phones.
phones="$(simple-mtpfs -l 2>/dev/null | sed "s/^/📱/")"
mountedphones="$(rg "simple-mtpfs" /etc/mtab)"
# If there are already mounted phones, remove them from the list of mountables.
[ -n "$mountedphones" ] && phones="$(for phone in $phones; do
  for mounted in $mountedphones; do
    escphone="$(escape "$phone")"
    [[ "$mounted" =~ "$escphone" ]] && break 1
  done && continue 1
  echo "$phone"
done)"

# Check for drives.
lsblkoutput="$(doas lsblk -rpo "uuid,name,type,size,label,mountpoint,fstype")"
# Get all LUKS drives
allluks="$(echo "$lsblkoutput" | rg crypto_LUKS)"
# Get a list of the LUKS drive UUIDs already decrypted.
decrypted="$(find /dev/disk/by-id/dm-uuid-CRYPT-LUKS2-* | sed "s|.*LUKS2-||;s|-.*||")"
# Functioning for formatting drives correctly for mew:
filter() { sed "s/ /:/g" | awk -F':' '$7==""{printf "%s%s (%s) %s\n",$1,$3,$5,$6}'; }

# Get only LUKS drives that are not decrypted.
unopenedluks="$(for drive in $allluks; do
  uuid="${drive%% *}"
  uuid="${uuid//-/}" # This is a bashism.
  [ -n "$decrypted" ] && for open in $decrypted; do
    [ "$uuid" = "$open" ] && break 1
  done && continue 1
  echo "🔒 $drive"
done | filter)"

# Get all normal, non-encrypted or decrypted partitions that are not mounted.
normalparts="$(echo "$lsblkoutput" | rg -v crypto_LUKS | rg 'part|rom|crypt' | sed "s/^/💾 /" | filter)"

# Add all to one variable. If no mountable drives found, exit.
alldrives="$(echo "$phones
$unopenedluks
$normalparts" | sed "/^$/d;s/ *$//")"

# Quit the script if a sequential command fails.
set -e

test -n "$alldrives"

# Feed all found drives to mew and get user choice.
chosen="$(echo "$alldrives" | mew -c -l 10 -p "Mount which drive?" -i)"

# Function for prompting user for a mountpoint.
getmount() {
  mp="$(find /mnt /media /mount /home -maxdepth 1 -type d 2>/dev/null | mew -c -l 10 -i -p "Mount this drive where?")"
  test -n "$mp"
  if [ ! -d "$mp" ]; then
    mkdiryn=$(printf "No\\nYes" | mew -c -l 2 -i -p "$mp does not exist. Create it?")
    [ "$mkdiryn" = "Yes" ] && (mkdir -p "$mp" || doas_askpass mkdir -p "$mp")
  fi
}

attemptmount() {
  # Attempt to mount without a mountpoint, to see if drive is in fstab.
  doas mount "$chosen" || return 1
  notify-send "💾Drive Mounted." "$chosen mounted."
  exit
}

case "$chosen" in
💾*)
  chosen="${chosen%% *}"
  chosen="${chosen:1}" # This is a bashism.
  parttype="$(echo "$lsblkoutput" | rg "$chosen" | awk '{print $NF}' | tr -d '[:space:]\r\n')"
  attemptmount || getmount
  case "${parttype##* }" in
  vfat) doas mount -t vfat "$chosen" "$mp" -o rw,umask=0000 ;;
  btrfs) doas mount "$chosen" "$mp" ;;
  ntfs) doas mount -t ntfs3 "$chosen" "$mp" ;;
  *) doas mount "$chosen" "$mp" -o uid="$(id -u)",gid="$(id -g)" ;;
  esac
  notify-send "💾Drive Mounted." "$chosen mounted to $mp."
  ;;

🔒*)
  chosen="${chosen%% *}"
  chosen="${chosen:1}" # This is a bashism.
  # Number the drive.
  while true; do
    [ -f "/dev/mapper/usb$num" ] || break
    num="$(printf "%02d" "$((num + 1))")"
  done

  # Decrypt in a terminal window
  ${TERMINAL:-st} -a termfloat -e doas cryptsetup open "$chosen" "usb$num"
  # Check if now decrypted.
  test -b "/dev/mapper/usb$num"

  attemptmount || getmount
  doas mount "/dev/mapper/usb$num" "$mp"
  notify-send "🔓Decrypted drive Mounted." "$chosen decrypted and mounted to $mp."
  ;;

📱*)
  notify-send "❗Note" "Remember to allow file access on your phone now."
  getmount
  number="${chosen%%:*}"
  number="${chosen:1}" # This is a bashism.
  doas_askpass simple-mtpfs -o allow_other -o fsname="simple-mtpfs-$(escape "$chosen")" --device "$number" "$mp"
  notify-send "🤖 Android Mounted." "Android device mounted to $mp."
  ;;
esac