nsxiv-thumb-bsd

#!/usr/bin/env sh

set -e

OPENER="${OPENER:-"xdg-open"}"
CACHEDIR="${NSXIV_THUMB_CACHE_DIR:-"${XDG_CACHE_HOME:-"$HOME/.cache"}/nsxiv-extra/nsxiv-thumb"}"
# extension of thumbnails. can be jpg or png.
EXT="jpg"

[ "$#" -gt 0 ] && {
    cd "$1" || exit 1
}

trap 'rm -rf -- "$tmpdir"' TERM INT EXIT HUP
mkdir -p -- "$CACHEDIR"
! command -v mktemp > /dev/null 2>&1 \
    || ! tmpdir="$(mktemp -d)" \
    || [ -z "$tmpdir" ] \
    && {
        tmpdir="${TMPDIR:-/tmp}/nsxiv_$$"
        mkdir -p -- "$tmpdir"
    }

find '.' \( -type f -o -type l \) -print \
    | while IFS= read -r file; do
        file="${file##./}"
        [ "$file" != "${file##*/}" ] && continue
        realpath="$(stat -f "%R" -- "$file")"

        case "$(file -b --mime-type -- "$realpath")" in
            video/*) :;;
            *) exit 0;;
        esac
        
        hash="$(stat -f "%T%i%N%z%B%m" -- "$realpath" | md5 | cut -d" " -f1)"
        thumbfl="$CACHEDIR/$hash.$EXT"
        [ -f "$thumbfl" ] || ffmpegthumbnailer -i "$file" -o "$thumbfl" -m -s 384 2> /dev/null
        cp -- "$thumbfl" "$tmpdir/$file.$EXT"
    done

{ nsxiv -otp -- "$tmpdir"; rm -rf -- "${tmpdir:?}" > /dev/null; } \
    | sed "s|\.$EXT$||;s|^.*/||" \
    | sort \
    | while IFS= read -r file; do
        "$OPENER" ./"$file"
    done