nnn/plugins/splitjoin

#!/usr/bin/env bash

# Description: Splits the file passed as argument or joins selection
#
# Note: Adds numeric suffix to split files
#       Adds '.join' suffix to the first file to be joined and saves as output file for join
#
# Shell: Bash
# Author: Arun Prakash Jana

selection=~/.config/nnn/.selection

echo -n "press 's' (split current file) or 'j' (join selection): "
read resp

if [ "$resp" = "j" ]; then
    if [ -s "$selection" ]; then
        arr=$(cat $selection | tr '\0' '\n')
        { read -r file; } <<< "$arr"

        file=$(basename "$file").out

        cat "$selection" | sort -z | xargs -0 -i cat {} > "$file"
    fi
elif [ "$resp" = "s" ]; then
    if ! [ -z "$1" ] && [ -f "$1" ] ; then
        # a single file is passed
        echo -n "split size in MB: "
        read size

        if ! [ -z "$size" ]; then
            split -d -b "$size"M "$1" "$1"
        fi
    fi
fi