vifm previewer script for images, PDF, ePub, audio, video

vifmrc

fileviewer <image/*>
    \ visualpreview image %pw %ph %px %py %c %N
    \ %pc
    \ visualpreview clear

fileviewer <video/*>
    \ visualpreview video %pw %ph %px %py %c %N
    \ %pc
    \ visualpreview clear

fileviewer <font/*>
    \ visualpreview font %pw %ph %px %py %c %N
    \ %pc
    \ visualpreview clear

fileviewer {*.pdf}
    \ visualpreview pdf %pw %ph %px %py %c %N
    \ %pc
    \ visualpreview clear

fileviewer {*.epub,*.mobi,*.azw,*.azw[0-9]},<application/epub+zip>,<application/x-mobipocket-ebook>,<application/vnd.amazon.ebook>
    \ visualpreview epub %pw %ph %px %py %c %N
    \ %pc
    \ visualpreview clear

visualpreview

#!/usr/bin/env bash

[ -d "$HOME/.cache/vifm" ] || mkdir -p "$HOME/.cache/vifm"

action="${1}"
width="${2}"
height="${3}"
xpos="${4}"
ypos="${5}"
input_file="${6}"
no_detach="${7}"

thumbnail_ext="jpg"
thumbnail_id="$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f "${PWD}/${input_file}")" | sha256sum | awk '{print $1}')"
thumbnail_path="${HOME}/.cache/vifm"
thumbnail_file="${thumbnail_path}/${thumbnail_id}.${thumbnail_ext}"

close_preview() {
    kitten icat --clear --silent >/dev/tty </dev/tty "${no_detach}"
    exit 0
}

show_preview() {
    input_file="$1"
    width="$2"
    height="$3"
    xpos="$4"
    ypos="$5"

    kitten icat --silent --transfer-mode=file --place=${width}x${height}@${xpos}x${ypos} --scale-up "${input_file}" >/dev/tty </dev/tty "${no_detach}"
    exit 0
}

case "$action" in

  clear)
    close_preview
    ;;

  image)
    if [ ! -f "${thumbnail_file}" ]; then
        imgwidth=$(identify -format '%w' "${input_file}[0]")
        if [ "${imgwidth}" -lt 1024 ]; then
            convert "${input_file}[0]" -strip -quality 50 -density 72 "${thumbnail_file}"
        elif [ "${imgwidth}" -le 1920 ]; then
            convert "${input_file}[0]" -thumbnail '50%' -strip -quality 35 -density 72 "${thumbnail_file}"
        else
            convert "${input_file}[0]" -thumbnail 1024 -strip -quality 35 -density 72 "${thumbnail_file}"
        fi
    fi
    show_preview "${thumbnail_file}" "${width}" "${height}" "${xpos}" "${ypos}"
    ;;

  video)
    if [ ! -f "${thumbnail_file}" ]; then
        ffmpegthumbnailer -i "${input_file}" -o "${thumbnail_file}" -s 0 -q 5
    fi
    show_preview "${thumbnail_file}" "${width}" "${height}" "${xpos}" "${ypos}"
    ;;

  epub)
    if [ ! -f "${thumbnail_file}" ]; then
        epub-thumbnailer "${input_file}" "${thumbnail_file}" 1024
    fi
    show_preview "${thumbnail_file}" "${width}" "${height}" "${xpos}" "${ypos}"
    ;;

  pdf)
    if [ ! -f "${thumbnail_file}" ]; then
        pdftoppm -jpeg -f 1 -singlefile "${input_file}" "${thumbnail_file%.${thumbnail_ext}}"
    fi
    show_preview "${thumbnail_file}" "${width}" "${height}" "${xpos}" "${ypos}"
    ;;

  audio)
    if [ ! -f "${thumbnail_file}" ]; then
        ffmpeg -i "${input_file}" "${thumbnail_file}" -y >/dev/null
    fi
    show_preview "${thumbnail_file}" "${width}" "${height}" "${xpos}" "${ypos}"
    ;;

  font)
    if [ ! -f "${thumbnail_file}" ]; then
      fontpreview -i "${input_file}" -o "${thumbnail_file}"
    fi
    show_preview "${thumbnail_file}" "${width}" "${height}" "${xpos}" "${ypos}"
    ;;
  *)
esac