nnn/plugins/splitjoin

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#!/usr/bin/env sh
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# 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
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#
# Shell: POSIX compliant
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# Authors: Arun Prakash Jana, ath3
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selection=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection
resp=s
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if [ -s "$selection" ]; then
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printf "press 's' (split current file) or 'j' (join selection): "
read -r resp
fi
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if [ "$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
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file="$(basename "$(echo "$arr" | sed -n '1p' | sed -e 's/[0-9][0-9]$//')")"
sort -z < "$selection" | xargs -0 -I{} cat {} > "${file}.out"
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fi
elif [ "$resp" = "s" ]; then
if [ -n "$1" ] && [ -f "$1" ]; then
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# a single file is passed
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printf "split size in MB: "
read -r size
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if [ -n "$size" ]; then
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split -d -b "$size"M "$1" "$1"
fi
fi
fi