# -*- mode: sh -*-
set -e

abort() { local x=$1; shift; for i in "$@"; do echo >&2 "$0: abort: $i"; done; exit "$x"; }

mkdir -p "$(dirname "$0")/.git/hooks"
HOOK_COMMIT="$(dirname "$0")/.git/hooks/pre-commit"
if [ ! -x "$HOOK_COMMIT" ]; then
cat <<'eof' >"$HOOK_COMMIT"
#!/bin/sh
if git rev-parse -q --verify MERGE_HEAD; then exit; fi
case $(git rev-parse --abbrev-ref HEAD) in
pending-*) true;;
*)	if git diff --cached --name-only | \
	   grep '^src/.*/debian/changelog$' | \
	   while read x; do if ! [ -f "$x" ]; then continue; fi; echo "$x: $(head -n1 $x)"; done | \
	   grep -v UNRELEASED-FIXME-AUTOGENERATED-DEBCARGO; then
		echo >&2 "please don't finalise changelogs directly on the master branch, use ./release.sh instead"; exit 1;
	fi;;
esac
eof
chmod +x "$HOOK_COMMIT"
fi

if [ -n "$DEBCARGO" ]; then
	true
elif which debcargo >/dev/null; then
	DEBCARGO=$(which debcargo)
elif [ -f "$HOME/.cargo/bin/debcargo" ]; then
	DEBCARGO="$HOME/.cargo/bin/debcargo"
else
	abort 1 "debcargo not found, run \`cargo install debcargo\` or set DEBCARGO to point to it"
fi

test -x "$DEBCARGO" || abort 1 "debcargo found but not executable: $DEBCARGO"
dcver=$($DEBCARGO --version | sed -ne 's/debcargo //p')
case $dcver in
2.0.*|2.1.*|2.2.*|2.3.*)	abort 1 "unsupported debcargo version $dcver. try reinstalling with \`cargo install debcargo --force\`";;
2.4.*)	true;;
*)	abort 1 "unsupported debcargo version: $dcver";;
esac

if [ $# -ne 1 -a $# -ne 2 ]; then
	echo >&2 "Usage: $0 <rust-crate-name>"
	echo >&2 "       $0 <rust-crate-name> <old-version>"
	echo >&2 "See README.rst for more details on usage."
	exit 2
fi

CRATE="$1"
VER="$2"

PKGNAME=${PKGNAME:-$($DEBCARGO deb-src-name "$CRATE" $VER || abort 1 "couldn't find crate $CRATE")}
PKGBASE=$($DEBCARGO deb-src-name "$CRATE" || abort 1 "couldn't find crate $CRATE")
PKGDIR_REL="src/$PKGNAME"
PKGDIR="$PWD/$PKGDIR_REL"
BUILDDIR="$PWD/build/$PKGNAME"
PKGCFG="$PKGDIR/debian/debcargo.toml"

mkdir -p "$(dirname $BUILDDIR)"
ln -srf "$PWD/build.sh" "$PWD/build/build.sh"
chmod +x "$PWD/build/build.sh"

if [ -z "$CRATE" ]; then
	abort 2 "Usage: $0 <crate> [<version>]"
fi

run_debcargo() {
	rm -rf "$BUILDDIR" "$(dirname "$BUILDDIR")/rust-${PKGNAME}_${REALVER:-$VER}"*.orig.tar.*
	$DEBCARGO package --config "$PKGCFG" --directory "$BUILDDIR" "$@" "$CRATE" "${REALVER:-$VER}"
}

shouldbuild() {
	local dst="$1"
	local src="$2"
	test ! -e "$dst" -o "$src" -nt "$dst"
}