nnn/plugins/splitjoin

#!/usr/bin/env sh

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

selection=~/.config/nnn/.selection
resp=s

if [ -s "$selection" ]; then
    echo -n "press 's' (split current file) or 'j' (join selection): "
    read resp
fi

if [ "$resp" = "j" ]; then
    if [ -s "$selection" ]; then
        arr=$(tr '\0' '\n' < "$selection")
        if [ "$(echo "$arr" | wc -l)" -lt 2 ]; then
            echo "joining needs at least 2 files"
            exit
        fi
        for entry in $arr
        do
            if [ -d "$entry" ]; then
                echo "cant join directories"
                exit
            fi
        done

        file="$(basename "$(echo "$arr" | sed -n '1p' | sed -e 's/[0-9][0-9]$//')")"
        sort -z < "$selection" | xargs -0 -I{} cat {} > "${file}.out"
    fi
elif [ "$resp" = "s" ]; then
    if [ -n "$1" ] && [ -f "$1" ]; then
        # a single file is passed
        echo -n "split size in MB: "
        read size

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