#!/bin/sh
#
# Copyright (C) 2008 Jonathan Moore Liles
# This file is licensed under version 2 of the GPL.

. scripts/colors

# support functions for 'configure' scripts.

fatal ()
{
    echo "$BOLD$RED$*$SGR0" > /dev/stderr
    exit 255
}

ask ()
{
   local answer default

   default="`eval echo \\$$2`"
   default=${default:-$3}

   echo -n "$BLACK$BOLD::$SGR0 $1 [$BOLD${default}$SGR0] "
   read answer
   echo "${2}=${answer:-$default}" >> make.conf
}

ok ()
{
    echo "$BOLD${GREEN}ok${SGR0}"
}

failed ()
{
    echo "$BOLD${RED}failed!${SGR0}" > /dev/stderr
    rm -f make.conf
}

extract_options ()
{
    local OIFS

    if [ -f make.conf ]
    then
        OIFS="$IFS"
        IFS=''
        eval "`sed -n '/^## options/{ : i; /^## libs/{ q }; p; n; b i }' make.conf`"
        IFS="$OIFS"
    fi
}

begin ()
{
    echo -n "Checking sanity..."
    require_command pkg-config pkg-config > /dev/null
    require_command sed sed > /dev/null
    ok
}

begin_options ()
{
    # get the old values
    extract_options

    echo "# This is a generated file. Any changes may be lost!" > make.conf
    echo "## options" >> make.conf

    echo "--- Configuration required ---"
}

begin_tests ()
{
    echo "## libs/flags" >> make.conf
    extract_options
}

append ()
{
    echo "$1" >> make.conf
}

end ()
{
    echo "--- Configuration complete ---"
}

require_command ()
{
    echo -n "Checking for ${BOLD}$1${SGR0}..."

    if ! [ -x "`which $2`" ]
    then
	failed
	fatal "Command $1 not found."
    else
	ok
    fi
}

require_package ()
{
    echo -n "Checking for $BOLD$1$SGR0..."
    if ! pkg-config --exists $3
    then
    	failed
	fatal "Required package $1 doesn't appear to be installed."
    elif ! pkg-config --atleast-version $2 $3
    then
        failed
        fatal "The installed version of $1 (`pkg-config --mod-version $3`) is too old."
    fi

    append "${1}_LIBS=`pkg-config --libs $3`"
    append "${1}_CFLAGS=-DHAVE_${1} `pkg-config --cflags $3`"

    ok
    return 0
}


require_FLTK ()
{
    echo -n "Checking for ${BOLD}FLTK${SGR0}..."

    FLTK_VERSION=`fltk-config --version`

    FLTK_VERSION_MAJOR=`echo $FLTK_VERSION | cut -d'.' -f1`
    FLTK_VERSION_MINOR=`echo $FLTK_VERSION | cut -d'.' -f2`
    FLTK_VERSION_PATCH=`echo $FLTK_VERSION | cut -d'.' -f3`

    if ! ( [ $FLTK_VERSION_MAJOR -ge $1 ] && [ $FLTK_VERSION_MINOR -ge $2 ] && [ $FLTK_VERSION_PATCH -ge $3 ] )
    then
        failed
        fatal "The installed FLTK version ($FLTK_VERSION) is too old."
    else
        ok
    fi

    append "FLTK_LIBS=`fltk-config --use-images --ldflags`"
    append "FLTK_CFLAGS=`fltk-config --cflags`"
}