open

#!/bin/sh
set -euf

spawn() {
  exec setsid -f -- "$@" </dev/null >&0 2>&0
}

if [ -n "${TMUX-}" ]; then
  execute() {
    exec tmux new-window -a -- "$@"
  }
else
  execute() {
    exec "$@"
  }
fi

if [ -n "${OPENER_CHOOSE-}" ]; then
  choose() {
    printf '%s\n' "$@" | fzf \
      --no-sort --disabled --layout=reverse \
      --no-info --prompt="Open with > " \
      --bind=change:clear-query \
      --bind=q:abort \
      --bind=j:down,k:up \
      --bind=d:half-page-down,u:half-page-up \
      --bind=space:page-down,backspace:page-up \
      --bind=g:first,G:last \
      --bind=f:jump,jump:accept
  }
else
  choose() {
    printf '%s' "$1"
  }
fi

case "$1" in
  file://*)
    for file; do
      tmux new-window -a -- lf -- "${file#file://}"
    done
    exit
    ;;
  http://*|https://*)
    if [ -n "${DISPLAY-}" ]; then
      spawn firefox -- "$@"
    else
      execute lynx -- "$@"
    fi
    ;;
  magnet:*)
    deluged >/dev/null 2>&1 || :
    spawn deluge console add -- "$@"
    ;;
esac

for file; do
  [ -e "$file" ]
done

extension() {
  ext="$(printf '%s' "$1" | tr '[:upper:]' '[:lower:]')"
  ext="${ext##*.}"
}

mime() {
  mime="$(file -Lb --mime-type -- "$1")"
  case "$mime" in
    application/zip)
      extension "$1"; [ "$ext" = cbz ] && mime="application/vnd.comicbook+zip";;
    application/x-rar)
      extension "$1"; [ "$ext" = cbr ] && mime="application/vnd.comicbook+rar";;
    application/x-7z-compressed)
      extension "$1"; [ "$ext" = cb7 ] && mime="application/vnd.comicbook+7z";;
    application/x-tar|\
    application/x-gtar|\
    application/x-ustar)
      extension "$1"; [ "$ext" = cbt ] && mime="application/vnd.comicbook+tar";;
    text/plain)
      extension "$1"; [ "$ext" = cue ] && mime="application/x-cue";;
  esac
  :
}

mime "$1"
case "$mime" in
  inode/directory)
    for file; do
      tmux new-window -a -- lf -- "$file"
    done
    exit
    ;;
  application/gzip|\
  application/x-bzip2|\
  application/x-xz|\
  application/x-lzma|\
  application/x-lz4|\
  application/zstd|\
  application/x-snappy-framed|\
  application/x-tar|\
  application/x-gtar|\
  application/x-ustar|\
  application/zip|\
  application/x-7z-compressed|\
  application/x-rar)
    exec ouch decompress "$@";;
  application/pdf|\
  application/postscript|\
  image/x-eps|\
  image/vnd.djvu|\
  application/epub+zip|\
  application/vnd.comicbook+zip|\
  application/vnd.comicbook+rar|\
  application/vnd.comicbook+7z|\
  application/vnd.comicbook+tar)
    if [ -n "${DISPLAY-}" ]; then
      spawn zathura -- "$@"
    fi
    ;;
  application/vnd.oasis.opendocument.*|\
  application/vnd.openofficeorg.extension|\
  application/vnd.openxmlformats-officedocument.*|\
  application/vnd.ms-visio.drawing.main+xml|\
  application/msword|\
  application/vnd.ms-powerpoint|\
  application/vnd.ms-excel|\
  application/vnd.ms-publisher|\
  application/vnd.ms-works|\
  application/vnd.visio|\
  application/vnd.sun.xml.*|\
  application/vnd.stardivision.*|\
  application/x-star*|\
  application/x-mswrite|\
  text/rtf)
    if [ -n "${DISPLAY-}" ]; then
      spawn libreoffice "$@"
    fi
    ;;
  text/troff)
    exec man -l -- "$@";;
  text/html)
    if [ -n "${DISPLAY-}" ]; then
      first="true"
      for file; do
        if [ -n "$first" ]; then
          first=""
          set --
        fi
        set -- "$@" "file://$(urlencode "$file")"
      done
      spawn firefox -- "$@"
    else
      execute lynx -- "$@"
    fi
    ;;
  image/*)
    if [ -n "${DISPLAY-}" ]; then
      case "$(choose nsxiv gimp inkscape)" in
        nsxiv)
          if [ "$#" -eq 1 ] && [ "$(printf '%.1s' "$(basename -- "$1")")" != . ]; then
            file="$(realpath -s -- "$1")"
            dir="$(dirname -- "$file")"
            n="$(find -L "$dir" -maxdepth 1 -not -name '.*' -not -type d -print0 | sort -z |
              file="$file" awk -vRS='\0' '$0 == ENVIRON["file"] {print NR; exit}')"
            spawn nsxiv -a -n "$n" -- "$dir"
          else
            spawn nsxiv -a -- "$@"
          fi
          ;;
        gimp) spawn gimp -- "$@";;
        inkscape) spawn inkscape -- "$@";;
        *) exit;;
      esac
    fi
    ;;
  audio/*|*/ogg|application/x-cue)
    case "$(choose mpv mpvc)" in
      mpv) exec mpv --no-audio-display -- "$@";;
      mpvc) spawn mpvc add -- "$@";;
      *) exit;;
    esac
    ;;
  video/*)
    if [ -n "${DISPLAY-}" ]; then
      spawn mpv -- "$@"
    else
      exec mpv -- "$@"
    fi
    ;;
  application/x-shockwave-flash)
    if [ -n "${DISPLAY-}" ]; then
      spawn sh -c '
        for file; do
          flashplayer "$file"
        done' flashplayer "$@"
    fi
    ;;
esac

case "$(choose editor pager)" in
  editor) execute $EDITOR -- "$@";;
  pager) execute $PAGER -- "$@";;
  *) exit;;
esac