#!/bin/sh
# Convenience wrapper for easily viewing/setting options that
# the project's CMake scripts will recognize
set -e
command="$0 $*"

# check for `cmake` command
type cmake >/dev/null 2>&1 || {
    echo "\
This package requires CMake, please install it first, then you may
use this configure script to access CMake equivalent functionality.\
" >&2
    exit 1
}

usage="\
Usage: $0 [OPTION]... [VAR=VALUE]...

  Build Directory:
    --builddir=DIR         place build files in directory [build]
    --enable-static        build static libraries (in addition to shared)
    --enable-static-only   only build static libraries, not shared

  Installation Directories:
    --prefix=PREFIX        installation directory [/usr/local]
    --libdir=DIR           installation dir for libraries [PREFIX/lib<qual>]

  Optional Features:
    --enable-debug         compile in debugging mode

  Required Packages in Non-Standard Locations:
    --with-openssl=PATH    path to OpenSSL install root
    --with-bind=PATH       path to BIND install root
    --with-pcap=PATH       path to libpcap install root
    --with-flex=PATH       path to flex executable
    --with-bison=PATH      path to bison executable

  Influential Environment Variables (only on first invocation
  per build directory):
    CC                     C compiler command
    CFLAGS                 C compiler flags
    CXX                    C++ compiler command
    CXXFLAGS               C++ compiler flags
"

sourcedir="$(cd "$(dirname "$0")" && pwd)"

# Function to append a CMake cache entry definition to the
# CMakeCacheEntries variable
#   $1 is the cache entry variable name
#   $2 is the cache entry variable type
#   $3 is the cache entry variable value
append_cache_entry() {
    CMakeCacheEntries="$CMakeCacheEntries -D $1:$2=$3"
}

# set defaults
builddir=build
CMakeCacheEntries=""
append_cache_entry CMAKE_INSTALL_PREFIX PATH /usr/local
append_cache_entry ENABLE_DEBUG BOOL false

# parse arguments
while [ $# -ne 0 ]; do
    case "$1" in
        -*=*) optarg=$(echo "$1" | sed 's/[-_a-zA-Z0-9]*=//') ;;
        *) optarg= ;;
    esac

    case "$1" in
        --help | -h)
            echo "${usage}" 1>&2
            exit 1
            ;;
        --builddir=*)
            builddir=$optarg
            ;;
        --prefix=*)
            append_cache_entry CMAKE_INSTALL_PREFIX PATH $optarg
            ;;
        --libdir=*)
            append_cache_entry CMAKE_INSTALL_LIBDIR PATH $optarg
            ;;
        --enable-debug)
            append_cache_entry ENABLE_DEBUG BOOL true
            ;;
        --enable-static)
            append_cache_entry ENABLE_STATIC BOOL true
            ;;
        --enable-static-only)
            append_cache_entry ENABLE_STATIC_ONLY BOOL true
            ;;
        --with-openssl=*)
            append_cache_entry OPENSSL_ROOT_DIR PATH $optarg
            ;;
        --with-bind=*)
            append_cache_entry BIND_ROOT_DIR PATH $optarg
            ;;
        --with-pcap=*)
            append_cache_entry PCAP_ROOT_DIR PATH $optarg
            ;;
        --with-flex=*)
            append_cache_entry FLEX_EXECUTABLE PATH $optarg
            ;;
        --with-bison=*)
            append_cache_entry BISON_EXECUTABLE PATH $optarg
            ;;
        *)
            echo "Invalid option '$1'.  Try $0 --help to see available options."
            exit 1
            ;;
    esac
    shift
done

if [ -d $builddir ]; then
    # If build directory exists, check if it has a CMake cache
    if [ -f $builddir/CMakeCache.txt ]; then
        # If the CMake cache exists, delete it so that this configuration
        # is not tainted by a previous one
        rm -f $builddir/CMakeCache.txt
    fi
else
    # Create build directory
    mkdir -p $builddir
fi

echo "Build Directory : $builddir"
echo "Source Directory: $sourcedir"
cd $builddir
cmake $CMakeCacheEntries $sourcedir

echo "# This is the command used to configure this build" >config.status
echo $command >>config.status
chmod u+x config.status