configure

#!/bin/sh
################################################################################
# Copyright (C) 2015, Jean-Yves VET, contact [at] jean-yves [dot] vet          #
#                                                                              #
# This software is licensed as described in the file LICENCE, which you should #
# have received as part of this distribution. You may opt to use, copy,        #
# modify, merge, publish, distribute and/or sell copies of the Software, and   #
# permit persons to whom the Software is furnished to do so, under the terms   #
# of the LICENCE file.                                                         #
#                                                                              #
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY    #
# KIND, either express or implied.                                             #
#                                                                              #
##----[ DESCRIPTION ]---------------------------------------------------------##
# A simple wrapper to provide cmake with:                                      #
#             * a --help argument (similar to autotools)                       #
#             * a more intuitive ./configure & make & make install procedure   #
#                                                                              #
##----[ ARGUMENTS ]-----------------------------------------------------------##
#          -h, --help        :   Print help.                                   #
#          --prefix=PREFIX   :   Install files in PREFIX [${PREFIX}]           #
#          --enable-tests    :   Build also unit tests.                        #
#          --enable-debug    :   Enable debug support.                         #
#                                                                              #
################################################################################


##----[ GLOBAL VARIABLES ]----------------------------------------------------##

    ENABLE_TESTS='false'
    ENABLE_COLORS='false'
    BUILD_DIR=$PWD
    SOURCE_DIR="`dirname "$0"`"


##----[ ERRORS ]--------------------------------------------------------------##

    ERROR_MISSING_CMAKE="Cmake is not installed. Please install the package."
    ERROR_INVALID_ARG="Please check --help. Invalid argument: "


##----[ HELP MESSAGE ]--------------------------------------------------------##

HELP="'configure' is a cmake wrapper. For a better control,
prefer to use cmake directly.

Usage: ./configure [OPTIONS]

Configuration:
   -h, --help           Display this help and exit

Installation directory:
   --prefix=PREFIX      Install files in PREFIX

By default, 'make install' will install all the files 
in '/usr/local'. You may specify another installation 
prefix by using '--prefix' for instance :
'--prefix=$HOME/usr/bin'.

Optional Features:
   --enable-tests       Build also unit tests.
   --enable-debug       Enable debug support.
   "


##----[ FUNCTIONS ]-----------------------------------------------------------##

    ############################################################################
    # Print error in stderr.                                                   #
    # Args:                                                                    #
    #      -$1: Error code.                                                    #
    # Result: Print error and quit.                                            #
    print_error_and_stop()
    {
        # Extract argument
        error_msg=${1}
        error_arg=${2}

        # Check if colors are enabled and display the error
        if [ ${ENABLE_COLORS} = "true" ]; then
            echo "\033[1;31mERROR:\033[0m \033[31m${error_msg}" \
                 "${error_arg}\033[0m" 1>&2
        else
            echo "ERROR: ${error_msg}${arror_arg}" 1>&2
        fi

        exit 1
    }


    ############################################################################
    # Check if Cmake is installed.                                             #
    # Args:                                                                    #
    #        None                                                              #
    # Result: .                                                                #
    check_cmake_install()
    {
        # Check if jq is installed
        command -v cmake >/dev/null 2>&1 \
                 || print_error_and_stop "${ERROR_MISSING_CMAKE}"
    }


    ############################################################################
    # Check build and source directories.                                      #
    # Args:                                                                    #
    #        None                                                              #
    # Result: .                                                                #
    check_directories()
    {
        if [ "${SOURCE_DIR}" != "." ];
        then
            SOURCE_DIR=$(cd `dirname "$0"` && pwd)
        else
            SOURCE_DIR="${PWD}"
        fi

        # Avoid to build locally
        if [ "${BUILD_DIR}" = "${SOURCE_DIR}" ];
        then
            #check if build directory exist
            if [ ! -d "${PWD}/build" ];
            then
                mkdir -p build
            fi
            BUILD_DIR="${PWD}/build"
            SOURCE_DIR="${PWD}"
        fi
    }


    ############################################################################
    # Check if we may activate colors.                                         #
    # Args:                                                                    #
    #        None                                                              #
    # Result: .                                                                #
    check_colors()
    {
        if [ -t 1 ]; then
            ncolors=$(tput colors)
            if test -n "$ncolors" && test $ncolors -ge 8; then
                ENABLE_COLORS='true'
            fi
        fi
    }


    ############################################################################
    # Parge all arguments.                                                     #
    # Args:                                                                    #
    #      -$*: All arguments.                                                 #
    # Result: set configuration                                                #
    parse_arguments()
    {
        for arg in "$@"
        do
            case "$arg" in
                -h | --help)
                    echo "${HELP}"
                    exit 0
                    ;;
                --prefix=*)
                    res=`echo "$arg" | sed -e "s/^--prefix=//g"`
                    PARAM="-DCMAKE_INSTALL_PREFIX=${res}"
                    ;;
                --enable-debug)
                    PARAM="${PARAM} -DDEBUG:BOOL=TRUE"
                    ;;
                --enable-tests)
                    PARAM="${PARAM} -DBUILD_TESTS:BOOL=TRUE"
                    ENABLE_TESTS='true'
                    ;;
                *)
                    print_error_and_stop "${ERROR_INVALID_ARG}" "${arg}"
			        ;;
            esac
        done
    }


    ############################################################################
    # Execute cmake.                                                           #
    # Args:                                                                    #
    #        None                                                              #
    # Result: .                                                                #
    exec_cmake()
    {
		cd ${BUILD_DIR}
		cmake ${PARAM} ${SOURCE_DIR}
        cd ${SOURCE_DIR}
    }


    ############################################################################
    # Generate Makefile to call the one created by cmake.                      #
    # Args:                                                                    #
    #        None                                                              #
    # Result: .                                                                #
    generate_makefile()
    {
cat > Makefile << EOF
all:
	@make --no-print-directory -C ${BUILD_DIR} all

install:
	@make --no-print-directory -C ${BUILD_DIR} install

clean:
	@make --no-print-directory -C ${BUILD_DIR} clean

test:
	@cd ${BUILD_DIR} && ctest

distclean:
	@rm -rf ${BUILD_DIR}
	@rm -rf ${SOURCE_DIR}/bin
	@rm ${SOURCE_DIR}/Makefile
EOF
    }


##----[ MAIN ]----------------------------------------------------------------##

    check_cmake_install
    check_directories
    check_colors

    parse_arguments $*
    exec_cmake
    generate_makefile

    exit $?