nnn/plugins/cleanfilename

#!/usr/bin/env sh

# Description: Clean filename or dirname (either hovered or selections)
#              to be more shell-friendly.
#              This script replaces any non A-Za-z0-9._- char
#              with underscore (_).
#
#              LIMITATION: Won't work with filename that contains newline
#
# Dependencies: sed
#
# Shell: POSIX compliant
# Author: Benawi Adha

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

cleanup() {
    printf "%s" "$1" | sed -e 's/[^A-Za-z0-9._-]/_/g'
}

if [ -s "$sel" ]; then
    targets=$(sed -e "s/\\x0/\\n/g;\$a\\" "$sel" | \
        while read -r i; do
            basename "$i";
        done)
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