configure

#!/bin/sh

readonly PIPE="/tmp/configure"

version() {
	echo -n "Looking for $1..."

	local version
	echo -n " broken installation" >"$PIPE.err"
	version="`"$1" --version 2>>"$PIPE.err" | grep -o '[[:digit:].]\+[[:digit:]]'`"
	rm "$PIPE.err"
	echo " found `echo "$version" | head -n1`"
}

helper() {
	local file="$1"
	local color="$2"
	printf %s "[${color}m" >&2
	tr -d '\n' <"$file" | sed 's/.*://;a\' >&2
	printf %s "" >&2
	rm "$file"
}

handler() {
	[ -e "$PIPE.err" ] && helper "$PIPE.err" 31
	[ -e "$PIPE.warn" ] && helper "$PIPE.warn" 93
}

set -e
trap handler EXIT

version cargo
version rustc

echo -n "Checking Rust 2018 support..."
echo " not present" >"$PIPE.err"
rustc --help -v | grep -- --edition >/dev/null
echo " present"

version make

echo -n "Checking GNU Make language support..."
echo " not present" >"$PIPE.err"
make --version | grep GNU >/dev/null
echo " present"

version cc
version bindgen
version rustfmt
version ld
version nm
version objcopy
version git

dir="`dirname "$0"`"

git() {
	"`which git`" -C "$dir" "$@"
}

cargo() {
	local owd="$PWD"
	cd "$dir"
	"`which cargo`" "$@"
	cd "$owd"
}

echo -n "Checking submodules..."
if git submodule status | grep '^-' >/dev/null
then
	echo " initializing"
	git submodule update --init --recursive
elif git submodule status | grep '^+' >/dev/null
then
	echo " inconsistent" >"$PIPE.warn"
	handler
else
	echo " consistent"
fi

echo -n "Configuring toolchain..."
if [ -e "$dir/.cargo/config" ]
then
	echo " skipping"
else
	cat >"$dir/.cargo/config" <<-tac
		`cat "$dir/.cargo/config.toml"`
		rustc = ".cargo/rustc"
	tac
	echo " generated"
fi

echo -n "Cleaning libinger build..."
cargo clean
echo " done"

echo -n "Cleaning libgotcha build..."
make -C"$dir/external/libgotcha" clean >/dev/null
echo " done"

echo -n "Removing lockfile..."
rm -f "$dir/Cargo.lock"
echo " done"

echo -n "Detecting interpreter..."
if [ -n "$LIBINGER_LINKER" ]
then
	file -L "$LIBINGER_LINKER" 2>&1 | tee "$PIPE.err" | grep '\<ELF\>' >/dev/null
	echo " using $LIBINGER_LINKER"
elif [ -e "$dir/ld.so" ]
then
	echo " using `readlink "$dir/ld.so"`"
else
	echo " define LIBINGER_LINKER to a dynamic linker or place one at ./ld.so" >"$PIPE.err"
	false
fi