configure

#!/bin/sh

# Lightweight GPIO Interface Library for the Raspberry Pi
#
# Copyright (c) 2020 Benjamin Spencer
# =============================================================================
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
# =============================================================================

# Defaults:
prefix=/usr/local
debugsym=false
debuglog=false

# Loop through each input:
for arg in "$@"; do
    # Switch based on input:
    case "$arg" in
    # Prefix directory for install:
    --prefix=*)
        prefix=`echo $arg | sed 's/--prefix=//'`
        ;;

    # Debug symbols
    --enable-debug-sym)
        debugsym=true;;

    # Help options
    --help)
        echo 'Usage: ./configure [options]'
        echo 'Options:'
        echo '  --prefix=<path>: Installation directory prefix'
        echo '  --enable-debug-sym: Include compilation debug symbols'
        echo 'All invalid options are silently ignored'
        exit 0
        ;;
    esac
done

echo 'Generating Makefile'

# Append:
echo '# Configuration:' > Makefile
echo "PREFIX := $prefix" >> Makefile
echo "PREFIX := $prefix"

# Append if set:
if $debugsym; then
    # Append:
    echo 'DEBUG_SYM := -g' >> Makefile
    echo 'DEBUG_SYM := -g'
fi

# Append Makefile
echo ' ' >> Makefile
cat Makefile.in >> Makefile

echo 'Configuration complete'
echo 'Ready to use Makefile'