clean backup files (*~)

#!/bin/bash
# https://github.com/yeKcim/my_nautilus_scripts
# License: GNU General Public License V3, 29 June 2007
# Installation:
    # Nautilus: copy this file in ~/.local/share/nautilus/scripts/ and chmod +x it
    # Nemo:     copy this file in ~/.local/share/nemo/scripts/     and chmod +x it
    # Caja:     copy this file in ~/.config/caja/scripts/          and chmod +x it
# Dependency: trash-cli
# clean files~
IFS="
"
################################################
#        notification depends of system        #
################################################
function notif { 
    # the script is running in a term
    if [ $(env | grep '^TERM') ]; then printf "\n#### $(basename -- "$0") notification ####\n  ⇒  $1\n\n"
    else # in x, notifications
		if   hash notify-send 2>/dev/null; then notify-send "$1"
		elif hash zenity 2>/dev/null; then { echo "message:$1" | zenity --notification --listen & }
		elif hash kdialog 2>/dev/null; then { kdialog --title "$1" --passivepopup "This popup will disappear in 5 seconds" 5 & }
		elif hash xmessage 2>/dev/null; then xmessage "$1" -timeout 5
        else echo "$1" > "$(basename -- $0)_notif.txt"
        fi
    fi
}
################################################
#               dependency check               #
################################################
function depend_check {
    for arg; do
		hash "$arg" 2>/dev/null || { notif >&2 "Error: Could not find \"$arg\" application."; exit 1; }
    done    
}
################################################
#         do not overwrite with output         #
################################################
function do_not_overwrite {
    out="$1"
    while [[ -a "$out" ]]; do
        when=$(date +%Y%m%d-%H:%M:%S)
        [[ -f "$out" ]] && out="${out%.*}#$when.${out##*.}" || out="$out#$when"
    done
    echo "$out"
}
################################################
#          check if input files > min          #
################################################
function nb_files_check {
    nb_files="$1"
    min_nb_files="$2"
    if (( $1 < $2 )); then 
        [[ $2 == 1 ]] && notif "$1 file selected, \"$(basename -- $0)\" needs at least one input file" || notif "$1 file selected, \"$(basename -- $0)\" needs at least $2 input files" 
        exit 1
    fi 
}
################################################
#              error notifications             #
################################################
function error_check {
    nb_files="$1"
    error_message="Error: $2"
    nb_error="$3"
    name_error_files="$4"

    if [[ $nb_error != 0 ]]; then
        [[ $nb_error == 1 ]] && error_message="$error_message:$name_error_files"
        [[ $nb_error > 1 ]] && [[ $nb_error < $nb_files ]] && error_message="$error_message ($nb_error/$nb_files files: $name_error_files)"
        [[ $nb_error > 1 ]] && [[ $nb_error = $nb_files ]] && error_message="$error_message (All selected files)"
    notif "$error_message"
    fi
}
################################################
#      error write rights notifications        #
################################################
function writeout_right_check {
    out=$(readlink -f -- "$1")
    outdir="${out%/*}"
    [[ ! -w "$outdir" ]] && echo "1" || echo "0"
}

################################################
#                    script                    #
################################################
nb_files_check $# 1

hash "trash" 2>/dev/null && commandrm="trash" || { notif >&2 "If you don't like rm command in script, install trash (trash-cli package)."; commandrm="rm"; }

writeout_error=0; writeout_error_file=""

for arg
do
    input=$(readlink -f -- "$arg")

    if [[ -d "$input" ]]; then dir_input="$input"
    elif [[ -f "$input" ]]; then dir_input=$(readlink -f $(dirname $input))
    fi
    
    if [[ $(writeout_right_check "$dir_input/my_function_is_bad") == "1" ]]; then
        ((writeout_error++))
        writeout_error_file="$writeout_error_file \"$dir_input\""
        continue
    fi
    
    find "$dir_input" -name "*~" -type f -exec $commandrm -f -- {} \;
    
done

error_check "$#" "Can't write in output directory" "$writeout_error" "$writeout_error_file"