#!/bin/sh
# Convenience wrapper for easily viewing/setting options that
# the project's CMake scripts will recognize
#
# Adapted from Bro's wrapper.

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 Options:
    --builddir=DIR           Place build files in directory [build]
    --enable-debug           Compile in debugging mode
    --generator=GENERATOR    CMake generator to use (see cmake --help)
    --prefix=PATH            Installation prefix [/usr/local]
"
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"
}

# Function to remove a CMake cache entry definition from the
# CMakeCacheEntries variable
#   $1 is the cache entry variable name
remove_cache_entry () {
    CMakeCacheEntries="$CMakeCacheEntries -U $1"

    # Even with -U, cmake still warns by default if
    # added previously with -D.
    CMakeCacheEntries="$CMakeCacheEntries --no-warn-unused-cli"
}

# set defaults
builddir=build
prefix=/usr/local
CMakeCacheEntries=""

append_cache_entry CMAKE_INSTALL_PREFIX               PATH   $prefix
append_cache_entry CMAKE_BUILD_TYPE                   STRING Release

# 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=$optarg
            ;;
        --generator=*)
            CMakeGenerator="$optarg"
            ;;
        --prefix=*)
            append_cache_entry CMAKE_INSTALL_PREFIX PATH $optarg
            ;;
        --enable-debug)
            append_cache_entry CMAKE_BUILD_TYPE STRING Debug
            ;;
        *)
            echo "Invalid option '$1'.  Try $0 --help to see available options."
            exit 1
            ;;
    esac
    shift
done

if [ -n "$CMakeGenerator" ]; then
    cmake="${ScanBuild} cmake -G "$CMakeGenerator" $CMakeCacheEntries $sourcedir"
else
    cmake="${ScanBuild} cmake $CMakeCacheEntries $sourcedir"
fi

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
eval ${cmake}

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