#!/bin/sh

# Yaroslav de la Peña Smirnov 2021
# Shortcut script for backing up files with rsync.
# By default it starts a dry run, to check that there are no conflicts. To
# commit the copy, i.e. do a normal (non-dry) run, use -c as the first or last
# argument.

############################# Config example ###################################
## Lines in the locations file contain the shortcuts for the sources and
## destinations. For example, sources:
# src	d	/home/yaroslav/docs
# src	m	/home/yaroslav/music
## destinations:
# dst	rm	yaroslav@example.com:
# dst	hd	/mnt/disk/
## The columns MUST be separated by ONE tab character
################################################################################

locations="$HOME/docs/data/bkup/locations"
ops="-ahv --delete --progress"

if [ "$1" = "-c" ]; then
	srckey="$2"
	dstkey="$3"
else
	if [ "$3" != "-c" ]; then
		ops="-ahvn --delete"
	fi
	srckey="$1"
	dstkey="$2"
fi

if [ -z $srckey ] || [ -z $dstkey ]; then
	echo "Usage: bkup [-c] <source shortcut> <destination shortcut> [-c]"
	exit 1
fi

relsrc="$(grep -E "src[[:space:]]+$srckey" "$locations" | cut -f3)"
if [ -z "$relsrc" ]; then
	echo "Source shortcut not found"
	exit 1
fi
target="$(echo "$relsrc" | awk -F'/' '{print $(NF)}')"

reldst="$(grep -E "dst[[:space:]]+$dstkey[[:space:]]+" "$locations" | cut -f3)"
if [ -z "$reldst" ]; then
	echo "Destination shortcut not found"
	exit 1
fi

rsync $ops "$relsrc/" "$reldst$target/"