#!/bin/bash

help() {
	{
		echo ""
		echo "Usage: $0 [--exec] [--prefix pf] args.."
		echo "       $0 --build modname.so cppsources.."
		echo ""
		echo "Replacement args:"
		echo "    --cxx         gcc"
		echo "    --cxxflags    $( echo '-march=armv6 -mfloat-abi=hard -mfpu=vfp -O2 -pipe -fstack-protector-strong -fno-plt -Wall -Wextra -ggdb -I"/usr/share/yosys/include" -MD -MP -D_YOSYS_ -fPIC -I/usr/include -std=c++11 -Os -I/usr/include/python3.9 -I/usr/include/python3.9 -DWITH_PYTHON -DYOSYS_ENABLE_READLINE -DYOSYS_ENABLE_PLUGINS -DYOSYS_ENABLE_GLOB -DYOSYS_ENABLE_ZLIB -DYOSYS_ENABLE_TCL -DYOSYS_ENABLE_ABC -DYOSYS_ENABLE_COVER' | fmt -w60 | sed ':a;N;$!ba;s/\n/ \\\n                      /g' )"
		echo "    --ldflags     -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -rdynamic -L/usr/lib"
		echo "    --ldlibs      -lstdc++ -lm -lrt -lpython3.9 -lcrypt -lpthread -ldl -lutil -lm -lm -lpython3.9 -lboost_python39 -lboost_system -lboost_filesystem -lreadline -lffi -ldl -lz -ltcl8.6 -ltclstub8.6 -pthread -lprotobuf -lpthread"
		echo "    --bindir      /usr/bin"
		echo "    --datdir      /usr/share/yosys"
		echo ""
		echo "All other args are passed through as they are."
		echo ""
		echo "Use --exec to call a command instead of generating output. Example usage:"
		echo ""
		echo "  $0 --exec --cxx --cxxflags --ldflags -o plugin.so -shared plugin.cc --ldlibs"
		echo ""
		echo "The above command can be abbreviated as:"
		echo ""
		echo "  $0 --build plugin.so plugin.cc"
		echo ""
		echo "Use --prefix to change the prefix for the special args from '--' to"
		echo "something else. Example:"
		echo ""
		echo "  $0 --prefix @ bindir: @bindir"
		echo ""
		echo "The args --bindir and --datdir can be directly followed by a slash and"
		echo "additional text. Example:"
		echo ""
		echo "  $0 --datdir/simlib.v"
		echo ""
	} >&2
	exit 1
}

if [ $# -eq 0 ]; then
	help
fi

if [ "$1" == "--build" ]; then
	modname="$2"; shift 2
	set -- --exec --cxx --cxxflags --ldflags -o "$modname" -shared "$@" --ldlibs
fi

prefix="--"
get_prefix=false
exec_mode=false
declare -a tokens=()

for opt; do
	if $get_prefix; then
		prefix="$opt"
		get_prefix=false
		continue
	fi
	case "$opt" in
		"$prefix"cxx)
			tokens=( "${tokens[@]}"  gcc       ) ;;
		"$prefix"cxxflags)
			tokens=( "${tokens[@]}"  -march=armv6 -mfloat-abi=hard -mfpu=vfp -O2 -pipe -fstack-protector-strong -fno-plt -Wall -Wextra -ggdb -I"/usr/share/yosys/include" -MD -MP -D_YOSYS_ -fPIC -I/usr/include -std=c++11 -Os -I/usr/include/python3.9 -I/usr/include/python3.9 -DWITH_PYTHON -DYOSYS_ENABLE_READLINE -DYOSYS_ENABLE_PLUGINS -DYOSYS_ENABLE_GLOB -DYOSYS_ENABLE_ZLIB -DYOSYS_ENABLE_TCL -DYOSYS_ENABLE_ABC -DYOSYS_ENABLE_COVER  ) ;;
		"$prefix"ldflags)
			tokens=( "${tokens[@]}"  -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -rdynamic -L/usr/lib   ) ;;
		"$prefix"ldlibs)
			tokens=( "${tokens[@]}"  -lstdc++ -lm -lrt -lpython3.9 -lcrypt -lpthread -ldl -lutil -lm -lm -lpython3.9 -lboost_python39 -lboost_system -lboost_filesystem -lreadline -lffi -ldl -lz -ltcl8.6 -ltclstub8.6 -pthread -lprotobuf -lpthread    ) ;;
		"$prefix"bindir)
			tokens=( "${tokens[@]}" '/usr/bin'   ) ;;
		"$prefix"datdir)
			tokens=( "${tokens[@]}" '/usr/share/yosys'   ) ;;
		"$prefix"bindir/*)
			tokens=( "${tokens[@]}" '/usr/bin'"${opt#${prefix}bindir}" ) ;;
		"$prefix"datdir/*)
			tokens=( "${tokens[@]}" '/usr/share/yosys'"${opt#${prefix}datdir}" ) ;;
		--help|-\?|-h)
			if [ ${#tokens[@]} -eq 0 ]; then
				help
			else
				tokens=( "${tokens[@]}" "$opt" )
			fi ;;
		--exec)
			if [ ${#tokens[@]} -eq 0 ]; then
				exec_mode=true
			else
				tokens=( "${tokens[@]}" "$opt" )
			fi ;;
		--prefix)
			if [ ${#tokens[@]} -eq 0 ]; then
				get_prefix=true
			else
				tokens=( "${tokens[@]}" "$opt" )
			fi ;;
		*)
			tokens=( "${tokens[@]}" "$opt" )
	esac
done

if $exec_mode; then
	exec "${tokens[@]}"
fi

echo "${tokens[@]}"
exit 0

