configure

#!/bin/bash
#
# This file is part of the Offenbach Project
#
# (c) 2019-2024 Yannoff (https://github.com/yannoff)
#
# @project  Offenbach
# @author   Yannoff (https://github.com/yannoff)
# @link     https://github.com/yannoff/offenbach
# @license  http://opensource.org/licenses/MIT
#
# For the full copyright and license information,
# please view the LICENSE file bundled with this
# software sources.
#
# Installation configure script
#

vars=( prefix bindir mandir )
files=()

# Default value for prefix dir
prefix=/usr

usage() {
    if [ $# -gt 0 ]
    then
        echo
        printf "$@"
        echo
    fi
    cat >&2 <<EOH

    Usage: 
        
        $0 [--prefix=<prefix>] [--bindir=<bindir>] [--mandir=<mandir>] file1 [...file2 [file3]]

        $0 [--prefix=<prefix>] [--bindir=<bindir>] [--mandir=<mandir>] --list list-file

    Options:

        --help, -h Display this help and exit
        --prefix   The prefix dir (defaults to $prefix)
        --bindir   The binary install dir (defaults to \$PREFIX/bin)
        --mandir   The manual install dir (defaults to \$PREFIX/share/man)

        --list     Read the list of files to include from the given file instead of command arguments
EOH
}

while [ $# -gt 0 ]
do
    case $1 in
        # Support passing options in the --option=value form
        --*=*)
            arg=$1
            option=${arg%%=*}
            value=${arg##*=}
            shift 1
            set -- ${option} ${value} $@
            ;;
        --help|-h|--usage)
            usage
            exit 0
            ;;
        --prefix)
            prefix=$2
            shift 2
            ;;
        --bindir)
            bindir=$2;
            shift 2
            ;;
        --mandir)
            mandir=$2;
            shift 2
            ;;
        --list)
            files=(`xargs --arg-file=$2`)
            shift 2
            ;;
        --*)
            printf '\nUnrecognized option "%s", ignoring.\n' $1
            shift
            ;;
        *)
            files+=( $1 )
            shift
            ;;
    esac
done

if [ ${#files[*]} -eq 0 ]
then
    usage "%s\n%s\n%s" "Cannot establish the list of files to copy." \
        "Please provide them either as command-line arguments," \
        "either via a list file."
    exit 1
fi

[ -z "$bindir" ] && bindir=${prefix}/bin
[ -z "$mandir" ] && mandir=${prefix}/share/man

printf "\n\033[01;32mConfigured variables:\033[00m\n---------------------\n"
for v in ${vars[@]}
do
    printf "%s: %s\n" $v ${!v}
done

# Build Makefile base using heredoc
cat > Makefile <<EOT
# vim: set noexpandtab
all:
	echo "Everything OK. Run: sudo make install"

install:
EOT

# Build included files list
printf "\n\033[01;32mFiles to be included:\033[00m\n---------------------\n"
for f in "${files[@]}"
do
    printf "\tcp -v %s %s\n" $f $bindir 1>>Makefile
    printf "+ copy: %s\n" $f
done

# Run parts if found
printf "\n\033[01;32mRequirement checks:\033[00m\n---------------------\n"
[ -d configure.d/ ] && run-parts --arg=${bindir} configure.d 1>>Makefile

printf "\n\033[01;32mGenerated\033[00m Makefile.\n\n"