#!/bin/sh

require() {
  for cmd in "$@"; do
    command -v "$cmd" >/dev/null 2>&1 || {
      echo "doc: missing dependency: $cmd" >&2
      exit 1
    }
  done
}

require sioyek

dir="$HOME/doc"
test -d "$dir" || exit

if [ "$XDG_SESSION_TYPE" = x11 ]; then
  require dmenu
  picker() { dmenu -i -l 10 -p "Select file or folder: "; }
else
  require rofi
  picker() { rofi -dmenu -i -l 10 -p "Select file or folder"; }
fi

while :; do
  choice="$(find "$dir" -not -path "$dir/.*" -mindepth 1 -maxdepth 1 \( -type d -printf "%f/\n" -o -type f -printf "%f\n" \) | picker)"

  [ -n "$choice" ] || break

  if [ -d "$dir/${choice%/}" ]; then
    dir="$dir/${choice%/}"
  elif [ -f "$dir/$choice" ]; then
    sioyek "$dir/$choice" &
    break
  fi
done