change_photo_title

#! /usr/bin/env bash

set -eu
set -o pipefail

declare -r BASEDIR="$(dirname "$(readlink -e "$0")")"

source "$BASEDIR/lib/photofiles.sh"
source "$BASEDIR/lib/photoid.sh"
source "$BASEDIR/util/unprotect.sh"

PATH="$BASEDIR/metadata:$BASEDIR:$BASEDIR/lib:$PATH"

while getopts "kr" opt; do
    case $opt in
        k ) 
            ADD_TITLE_KEYWORD=;;
        r )
            REMOVE_OLD_TITLE_KEYWORD=;;
	esac
done
shift $(expr $OPTIND - 1 )

declare -r new_title=$(echo "${1:-}" | tr ' ' '-')
if [[ -z $new_title ]]; then
    echo "[ERROR] Title parameter missing" >&2
    exit 1
elif [[ -f $new_title || -d $new_title ]]; then
	echo "[ERROR] Title parameter is a file or directory" >&2
	exit 1
fi

shift 1

function apply_set_title() {

    local old_file=$1
    local old_photoid=$(photoid_get_from_file "$old_file")
    local old_title=$(photoid_get_title "$old_photoid")

    local new_photoid=$(photoid_set_title "$old_photoid" "$new_title")
    local newfile="$(dirname "$old_file")/$new_photoid.${old_file#*.}"

    if [[ -e $newfile ]]; then
        echo "[ERROR] Rename $file to \"$new_title\" failed: $newfile exists" >&2
        exit 1
    fi

    unprotect_file_if_needed "$old_file"
    set_photoid "$old_file" "$new_photoid"
    if [[ -v REMOVE_OLD_TITLE_KEYWORD ]]; then
        update_keywords "-$old_title" "$old_file"
    fi
    if [[ -v ADD_TITLE_KEYWORD ]]; then
        update_keywords "$new_title" "$old_file"
    fi
    reprotect_check_file "$old_file"
    mv "$old_file" "$newfile"

    echo "$newfile"
}

if [[ $# = 0 ]]; then
    collect_associated_files < /dev/stdin | while read -r file; do apply_set_title "$file"; done
else 
    collect_associated_files "$@" | while read -r file; do apply_set_title "$file"; done
fi