#!/bin/bash

#    nailing-cargo: wrapper to use unpublished local crates
#
#    Copyright (C) 2019 Ian Jackson
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as
#    published by the Free Software Foundation, either version 3 of the
#    License, or (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

# example usages:
#   ../nailing-cargo/nailing-cargo make
#   ../nailing-cargo/nailing-cargo cargo build
#   CARGO='../nailing-cargo/nailing-cargo cargo' make


# Why do we need this ?
#
#  https://stackoverflow.com/questions/33025887/how-to-use-a-local-unpublished-crate
#  https://github.com/rust-lang/cargo/issues/1481


lock=${PWD%/*}/.nail.lock
if [ "x$NAILING_CARGO" != "x$lock" ]; then
	NAILING_CARGO=$lock \
	exec with-lock-ex -w "$lock" "$0" "$@"
fi

exec 203<../Cargo.nail
f=Cargo.toml

sed='
/^ *\[dependencies\]/,/^ \[/{
'

exec 204<../Cargo.nail
while read <&204 what where; do
	if [ "x$what" = x- ]; then continue; fi
	if [ "x$what" = 'x#' ]; then continue; fi
	qwhere="${where//\//\\/}"
	sed+='
		s/^'$what' *= *\(\".*\"\) *$/'$what' = { version = \1 }/;
		s/^'$what' *= *{/'$what' = { path = "..\/'"${qwhere}"'", /;
		/^'$what' *=/ s/version *= *\"[^"]*\"//;
		/^'$what' *=/ s/, *\([,}]\)/\1/;
	'
done
sed+='}
'

exec 204<../Cargo.nail
while read <&204 what where; do
	if [ "x$what" = 'x#' ]; then continue; fi
	wf=../$where/$f
	rm -f $wf.nailing~
	sed <$wf >$wf.nailing~ "$sed"
done

exec 204<../Cargo.nail
while read <&204 what where; do
	if [ "x$what" = 'x#' ]; then continue; fi
	wf=../$where/$f
	if ! test -e $wf.unnailed~; then
		ln $wf $wf.unnailed~
	fi
done

trap '
	set +e
	while read <&203 what where; do
		if [ "x$what" = "x#" ]; then continue; fi
		wf=../$where/$f
		if test -e $wf.unnailed~; then
			rm -f $wf.nailed~
			ln $wf $wf.nailed~
			mv -f $wf.unnailed~ $wf
		fi
	done
	echo >&2 'Unnailed'
' EXIT

exec 204<../Cargo.nail
printf >&2 'Nailing'
while read <&204 what where; do
	if [ "x$what" = 'x#' ]; then continue; fi
	wf=../$where/$f
	printf >&2 ' %s' "$what"
	if cmp -s $wf.nailed~ $wf.nailing~; then
		mv -f $wf.nailed~ $wf
		rm -f $wf.nailing
	else
		mv -f $wf.nailing~ $wf
		rm -f $wf.nailed
	fi
done
echo >&2

"$@"