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#!/usr/bin/env sh

# Description: Open images in hovered  directory and thumbnails
#              open hovered image in sxiv or viu and browse other images in the directory
#
# Shell: POSIX compliant
# Author: Arun Prakash Jana

abspath() {
    case "$1" in
        /*) printf "%s\n" "$1";;
        *)  printf "%s\n" "$PWD/$1";;
    esac
}

listimages() {
    find -L "$(dirname "$target")" -maxdepth 1 -type f -iregex \
      '.*\(jpe?g\|bmp\|png\|gif\)$' -print0 | sort -z
}

sxiv_view_dir() {
    target="$(abspath "$1")"
    count="$(listimages | grep -a -m 1 -ZznF "$target" | cut -d: -f1)"

    if [ -n "$count" ]; then
        listimages | xargs -0 sxiv -n "$count" --
    else
        sxiv -- "$@" # fallback
    fi
}

if [ -z "$1" ] || ! [ -s "$1" ]; then
    printf "empty file"
    read -r _
    exit 1
fi

if command -v sxiv >/dev/null 2>&1; then
    if [ -f "$1" ]; then
        sxiv_view_dir "$1" >/dev/null 2>&1 &
    elif [ -d "$1" ] || [ -h "$1" ]; then
        sxiv -qt "$1" >/dev/null 2>&1 &
    fi
elif command -v viu >/dev/null 2>&1; then
    viu -n "$1" | less -R
else
    printf "install sxiv or viu"
    read -r _
    exit 2
fi