nnn/plugins/cleanfilename

#!/usr/bin/env bash

# Description: Clean filename or dirname (either hovered or selections)
#              to be more shell-friendly. This script cleans
#              any character which is not A-Za-z0-9._-
#              and replaces it with underscore (_).
#
#              It supports cleaning single/double quote, newline,
#              leading, trailing spaces.
#
#              eg.
#              to be continued (つづく).mp4  -> to_be_continued______.mp4
#              [work] stuff.txt              -> _work__stuff.txt
#              home's server                 -> home_s_server
#                qwe\trty                    -> __qwe_rty
#
#              And if there are two almost similar filenames
#              like: 'asd]f' and 'asd f' which both will be renamed to 'asd_f',
#              to avoid overwriting, the last file will be prepended by _.
#              So they will be: 'asd_f' and '_asd_f'
#
# Dependencies: sed
#
# Shell: Bash
# Author: Benawi Adha

prompt=true
sel=${NNN_SEL:-${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection}

cleanup() {
    # printf "%s" "$1" | sed -e 's/[^A-Za-z0-9._-]/_/g'
    printf "%s" "$1" | sed 's/[^A-Za-z0-9._-]/_/g' | sed ':a;N;$!ba;s/\n/_/g'
}

if [ -s "$sel" ]; then
    targets=()
    while IFS= read -r -d '' i || [ -n "$i" ]; do
        targets+=( "$(basename "$i")" )
    done < "$sel"
else
    targets=("$1")
fi

for i in "${targets[@]}"; do
    printf "%s -> %s\n" "$i" "$(cleanup "$i")";
done

if $prompt; then
    echo
    printf "Proceed [Yn]? "
    read -r input
    case "$input" in
        y|Y|'')
            ;;
        *)
            echo "Canceled"
            exit
            ;;
    esac
fi

for i in "${targets[@]}"; do
    if [ "$i" != "$(cleanup "$i")" ]; then
        tmp=''
        if [ -e "$(cleanup "$i")" ]; then
            tmp='_'
        fi
        mv "$i" "$tmp$(cleanup "$i")";
    fi
done

# Clear selection
if [ -s "$sel" ] && [ -p "$NNN_PIPE" ]; then
    printf "-" > "$NNN_PIPE"
fi