#!/bin/sh

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

Options:
  --[enable|disable]-syntax    Enable or disable syntax highlighting support. Default: enabled.
  --[enable|disable]-lsp       Enable or disable Language Server Protocol support. Default: enabled.
  --enable-asan                Build DGED with address sanitizer enabled. Default: disabled.
  --prefix=<PREFIX>            Set the build prefix path to <PREFIX>. Default: /usr/local.
  -h/--help                    Show this help text.
"

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

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

        --enable-lsp)
            enable_lsp=1
            shift 1
            ;;

        --disable-lsp)
            enable_lsp=0
            shift 1
            ;;

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

        --prefix)
            prefix="$2"
            shift 2
            ;;

        --prefix=*)
            prefix="${1#*=}"
            shift 1
            ;;

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

        # TODO: support the *dir flags
        --bindir=*)
            shift 1
            ;;

        --sbindir=*)
            shift 1
            ;;

        --includedir=*)
            shift 1
            ;;

        --oldincludedir=*)
            shift 1
            ;;

        --mandir=*)
            shift 1
            ;;

        --infodir=*)
            shift 1
            ;;

        --docdir=*)
            shift 1
            ;;

        --libdir=*)
            shift 1
            ;;

        --libexecdir=*)
            shift 1
            ;;

        --localedir=*)
            shift 1
            ;;

        -*)
            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

echo -n "detecting process model..."
if ./scripts/has_header "unistd.h"; then
    echo "posix."
    echo "#define PROCESS_MODEL posix" >> src/config.h
    echo "PROCESS_MODEL ?= posix" >> config.mk
else
    echo "unknown."
fi

if [ "$enable_syntax" -ne 0 ]; then
    echo "enabling syntax highlighting."
    echo "SYNTAX_ENABLE = true" >> config.mk
    echo "#define SYNTAX_ENABLE 1" >> src/config.h
else
    echo "disabling syntax highlighting."
    echo "SYNTAX_ENABLE = false" >> config.mk
    echo "#undef SYNTAX_ENABLE" >> src/config.h
fi

if [ "$enable_lsp" -ne 0 ]; then
    echo "enabling language server support."
    echo "LSP_ENABLE = true" >> config.mk
    echo "#define LSP_ENABLE 1" >> src/config.h
else
    echo "disabling language server support."
    echo "LSP_ENABLE = false" >> config.mk
    echo "#undef LSP_ENABLE" >> src/config.h
fi

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

if [ -n "$prefix" ]; then
    echo "setting prefix to \"$prefix\"."
    echo "prefix = $prefix" >> config.mk
fi

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