#!/bin/sh

# bpedit.sh, fstd 2018

# Dependencies (package names are for Debian)
#  - zlib-flate (package 'qpdf')
#    (for de/compression)
#
#  - xsel       (package 'xsel')
#    (for reading and writing the Xorg clipboard)
#
#  - jq         (package 'jq')
#    (for prettifying the json)
#
#  - base64     (package 'coreutils')
#    (for decoding the blueprint)
#
#  - $editor
#    (any will do, set your favorite below)

# Usage:
#  1. (Ingame) copy blueprint string
#  2. ./bpedit.sh
#  3. ($editor launches (see below), edit the blueprint then save+quit)
#  4. (Ingame) import blueprint string

# Set this to your preferred text editor
editor='vim'

# Check prerequisites
check_installed()
{
	if ! command -v "$1" >/dev/null 2>&1; then
		echo "Couldn't find the program '$1'." >&2
		[ -n "$2" ] && echo "Please install the package '$2'." >&2
		exit 1
	fi
}

check_installed 'zlib-flate' 'qpdf'
check_installed 'xsel' 'xsel'
check_installed 'jq' 'jq'
check_installed 'base64'
check_installed "$editor"

bp="$(mktemp /tmp/bpedit.sh.XXXXXXXXXX)"

trap "rm '$bp'" EXIT
trap 'exit 1' INT HUP QUIT TERM

# Required blueprint format version is 0
if ! [ "x$(xsel -ob | head -n1 | cut -b1)" = 'x0' ]; then
	echo "Unexpected blueprint version (or bad copy, check ">&2
	echo "whether 'xsel -ob' actually outputs the blueprint)" >&2
	exit 1
fi

# Decode, edit, encode
xsel -ob | sed '1s/^.//' | base64 -d | zlib-flate -uncompress | jq . >"$bp"
$editor "$bp"
zlib-flate -compress <"$bp" | base64 | sed '1s/^/0/' | xsel -ib