#!/bin/sh

_usage="./configure -- configure the DGED build.

Options:
  --[enable|disable]-syntax    Enable or disable syntax highlighting support.
  --enable-asan                Build DGED with address sanitizer enabled.
  -h/--help                    Show this help text.
"

enable_syntax=1
enable_asan=0
while [ "$#" -gt 0 ]; do
    case $1 in
         --disable-syntax)
            enable_syntax=0
            shift 1
            ;;

        --enable-syntax)
            enable_syntax=1
            shift 1
            ;;

        --enable-asan)
            enable_asan=1
            shift 1
            ;;

        -h|--help)
            echo "$_usage"
            exit
            ;;

        -*)
            echo "Unknown flag \"$1\". Usage:"
            echo "$_usage"
            exit 1
            ;;
        *)
            shift 1
            ;;
    esac
done


echo "/* Generated by configure */" > src/config.h
echo "#ifndef _CONFIG_H" >> src/config.h
echo "#define _CONFIG_H" >> src/config.h

echo "# generated by configure" > config.mk

echo -n "detecting event system... "
if ./scripts/has_header "sys/epoll.h"; then
    echo "epoll."
    echo "#define HAS_EPOLL 1" >> src/config.h
    echo "HAS_EPOLL ?= true" >> config.mk
elif ./scripts/has_header "sys/event.h"; then
    echo "kqueue."
    echo "#define HAS_KQUEUE 1" >> src/config.h
    echo "HAS_KQUEUE ?= true" >> config.mk
else
    echo "none."
fi

if [ "$enable_syntax" -ne 0 ]; then
    echo "enabling syntax highlighting"
    echo "SYNTAX_ENABLE = true" >> config.mk
else
    echo "disabling syntax highlighting"
    echo "SYNTAX_ENABLE = false" >> config.mk
fi

if [ "$enable_asan" -ne 0 ]; then
    echo "enabling address sanitizer"
    echo "ASAN = true" >> config.mk
fi


echo "#endif" >> src/config.h
echo "wrote src/config.h"
echo "wrote config.mk"