configure

#!/bin/bash
#
# vim: ts=4:ft=sh
# 
# Copyright (C) 2020-2022
#  
#    Øystein Schønning-Johansen <oysteijo@gmail.com>
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 
# 3. The names of the authors may not be used to endorse or promote
#    products derived from this software without specific prior
#    written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

projectname=npy_array
library=true

# Default values
prefix=/usr/local
debugsym=true
profilesym=false
shared=true
use_npz=true

for arg in "$@"; do
    case "$arg" in
    --prefix=*)
        prefix=`echo ${arg%/} | sed 's/--prefix=//'`
        ;;
    --enable-debug)
        debugsym=true;;
    --disable-debug)
        debugsym=false;;
    --enable-profile)
        profilesym=true;;
    --disable-profile)
        profilesym=false;;
    --enable-shared)
        shared=true;;
    --disable-shared)
        shared=false;;
    --enable-npz)
        use_npz=true;;
    --disable-npz)
        use_npz=false;;

    --help)
        echo 'usage: ./configure [options]'
        echo 'options:'
        echo '  --prefix=<path>:     installation prefix'
        echo '  --enable-debug:      include debug symbols (default on)'
        echo '  --disable-debug:     do not include debug symbols'
        echo '  --enable-profile:    include profile symbols (default off)'
        echo '  --disable-profile:   do not include profile symbols'
        echo '  --enable-shared:     build dynamic linked library. (default on)'
        echo '  --disable-shared:    build static linked library'
        echo '  --enable-npz:        build system with .npz features. (default on)'
        echo '  --disable-npz:       build system without .npz features.'
        echo 'all invalid options are silently ignored'
        exit 0
        ;;
    esac
done

printf "Prefix set to  ...        %s\n" $prefix

printf "Looking for pkg-config... "
if command -v pkg-config &> /dev/null
then
    printf "Yes, we have pkg-config!\n"
    have_libzip=`pkg-config --exists libzip && echo "true" || echo "false"`
    have_pkg_config=true
    libzip_libs=`pkg-config --libs libzip`
    libzip_cflags=`pkg-config --cflags libzip`
else
    printf "No, we do not have pkg-config!\n"
    # FIXME: There are some issues here: this requires gcc and an unix-like environment. What about icc, clang etc.? :-(
    have_libzip=`echo "#include <zip.h>" | gcc -c -o /dev/null -Werror -xc - > /dev/null 2>/dev/null && echo "true" || echo "false"`
    libzip_libs='-lzip'
fi

printf "Looking for libzip....... "
if ! $have_libzip; then
    printf "No\n"
    echo "WARNING: libzip library not found!"
    echo "libzip is highly recommended and was not found on this system. Please install the libzip packet(s) for your system." 
    use_npz=false
else
    printf "Yes, found libzip. "
    if ! $use_npz; then
        printf "But it will not be used!"
    fi
    printf "\n"
fi

#### Logic for finding pkg-config directory ####
if $have_pkg_config; then
    pc_path=none
    pc_paths=`pkg-config --variable pc_path pkg-config`
    directories=$(echo $pc_paths | tr ":" "\n")
    for d in $directories; do
        if [ -d $d ]; then
            pc_path=$d
            break
        fi
    done;
    if [ -z "${PKG_CONFIG_PATH}" ]; then
        printf "Install path for pkg-config .pc files: %s\n" $pc_path
    else
        pc_path=${PKG_CONFIG_PATH}
        printf "Install path for pkg-config .pc files: %s (PKG_CONFIG_PATH)\n" $pc_path
    fi
fi

if [ ! -d $prefix ]; then
    echo "WARNING: PREFIX directory ($prefix) not found. Make sure you really want"
    echo "to install in $prefix, or rerun configure with --prefix option." 
fi

#### Create the makefile ####
echo 'generating Makefile ...'
echo "target_lib   = lib${projectname}"     >Makefile
echo "PREFIX       = $prefix"              >>Makefile
if $debugsym; then
    echo 'dbg          = -g'               >>Makefile
fi
if $profilesym; then
    echo 'profile      = -pg'              >>Makefile
fi
echo "shared       = $shared"              >>Makefile 

echo "use_npz      = $use_npz"             >>Makefile
if $use_npz; then    
	echo 'src          = $(wildcard *.c)'  >>Makefile
    echo "LIBS         = $libzip_libs"     >>Makefile
    echo "INCLUDE      = $libzip_cflags"   >>Makefile
else
	echo 'src          = npy_array.c'      >>Makefile
fi

echo 'header_files = $(wildcard *.h)'      >>Makefile

if $have_pkg_config; then
    echo 'pkg_conf_pc   = npy_array.pc'    >>Makefile 
    echo "pkg_config_path = ${pc_path}"    >>Makefile
fi
    
echo "include Makefile.in"                 >>Makefile
echo "configure done, type 'make' to build."