diffpic

#!/bin/bash
# This script helps find duplicate photos in a directory, and delete the ones
# that have the (subjective) worst quality.
#
# 1. We first use `fdupes` to find binary duplicates.
# 2. Then we use `findimagedupes` to find visual duplicates. Those duplicates are
# shown with `feh` in batches, allowing you to use Ctrl+Del to delete the ones
# you don't like. 
# Dependencies: `findimagedupes` `fdupes` `feh` (`zenity`, `xargs` for renaming)
set -euo pipefail

DIR=${1:-${PWD}}

echo "Finding binary duplicates..." >&2
fdupes --delete --noempty --time --size "${DIR}"

echo "Finding visual duplicates..." >&2

# Prepare temporary directory and make sure it will be removed afterward
TMP=$(mktemp -d "${TMPDIR:-/tmp}/$(basename "$0").XXXXX")
function finalize {
    rm -rf "${TMP}"
}
trap finalize EXIT

# Prepare script for viewing & subsequent removal of duplicates
tee "${TMP}/custom.sh" 1> /dev/null << EOF
VIEW(){
    feh \
        --borderless \
        --auto-rotate \
        --scale-down \
        --zoom fill \
        --draw-tinted \
        --draw-actions \
        --draw-filename \
        --caption-path "." \
        --sort filename \
        --info "exiv2 %F | grep -v ':\s*$'; echo Size: %w×%h - %Sb; echo -n Modification:; date -r %F '+%%Y-%%m-%%d %%R'" \
        --edit \
        --action1 '[rename]zenity --entry --text "Rename:" --entry-text %F | xargs mv %F' \
        --action9 '[remove]zenity --question && gio trash %F' \
        "\$@"
    exit 0
}
EOF
find "${DIR:-.}" -mindepth 1 -maxdepth 1 -regex '.*\.\(png\|jpg\|jpeg\|tiff\|bmp\)' |
    findimagedupes --script="${TMP}/script.sh" --include-file="${TMP}/custom.sh" -
sh ${TMP}/script.sh