#
# $Id: frontend.in,v 1.14 2003/09/30 18:51:57 jmmv Exp $
# bt_pkgflags's frontend.
#
# buildtool
# Copyright (c) 2003 Julio M. Merino Vidal.
#
# 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. Neither the name of the author nor the names of contributors may
#    be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR
# CONTRIBUTORS 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.
#

set -w

usage() {
    local exitstatus=$1 detailed=${2:-no}

    [ ${detailed} = yes ] && echo "@PACKAGE@ version @VERSION@" 1>&2

    echo "usage: ${ProgName} [options] pkg1[,op,ver] .. pkgN[,op,ver]" 1>&2

    if [ ${detailed} = yes ]; then
        cat 1>&2 <<EOF

Available options:
    {-c|--cflags}    Print compilation flags.
    {-h|--help}      Show this help message.
    {-l|--libs}      Print library flags.

Available operators:
    < or lt, <= or le, = or eq, != or ne, >= or ge, > or gt

pkgconfig files are searched in the following path:
    \${PKG_CONFIG_PATH}:@DIR_PKGCONFIG@
pkgflags files are searched in the following path:
    \${BT_PATH_PKGFLAGS}:@DIR_PKGFLAGS@

See buildtool(1) for more information.
EOF
    fi

    exit ${exitstatus}
}

compare_versions() {
    local v1=$1 op=$2 v2=$3
    local v1_major v1_minor v1_micro
    local v2_major v2_minor v2_micro
    local ret

    # Fill missing numbers in version strings with zeros.
    v1_major=$(echo ${v1} | cut -d . -f 1); : ${v1_major:=0}
    v1_minor=$(echo ${v1} | cut -d . -f 2); : ${v1_minor:=0}
    v1_micro=$(echo ${v1} | cut -d . -f 3); : ${v1_micro:=0}
    v1=${v1_major}.${v1_minor}.${v1_micro}
    v2_major=$(echo ${v2} | cut -d . -f 1); : ${v2_major:=0}
    v2_minor=$(echo ${v2} | cut -d . -f 2); : ${v2_minor:=0}
    v2_micro=$(echo ${v2} | cut -d . -f 3); : ${v2_micro:=0}
    v2=${v2_major}.${v2_minor}.${v2_micro}

    ret=1
    case ${op} in
        lt|'<')
            [ ${v1} '<' ${v2} ] && ret=0
            ;;
        le|'<=')
            [ ${v1} '<' ${v2} -o ${v1} = ${v2} ] && ret=0
            ;;
        eq|'=')
            [ ${v1} = ${v2} ] && ret=0
            ;;
        ne|'!=')
            [ ${v1} != ${v2} ] && ret=0
            ;;
        ge|'>=')
            [ ${v1} '>' ${v2} -o ${v1} = ${v2} ] && ret=0
            ;;
        gt|'>')
            [ ${v1} '>' ${v2} ] && ret=0
            ;;
        *)
            btcmn_err "unknown version operator \`${op}'"
            ;;
    esac

    return ${ret}
}

parse() {
    local fmt="$1" pkgname="$2" pkgop="$3" pkgver="$4"

    if [ "\\${pkgop}" = "\\" ] || [ "\\${pkgver}" = "\\" ] || \
        compare_versions $(${fmt}_get_version) ${pkgop} ${pkgver}
    then
        [ ${show_cflags} = yes ] && output+=$(${fmt}_get_cflags)
        [ ${show_libs} = yes ] && output+=$(${fmt}_get_libs)
    else
        btcmn_warn "version mismatch for \`${pkgname}'"
        return 1
    fi

    return 0
}

main() {
    local show_cflags show_libs
    local output pkgname pkgop pkgver ret

    btcmn_req_runtime

    show_cflags=no
    show_libs=no
    while [ $# -gt 0 ]; do
        echo $1 | grep ^- >/dev/null || break

        case $1 in
            -c|--cflags)
                show_cflags=yes
                ;;
            -h|--help)
                usage 0 yes
                ;;
            -l|--libs)
                show_libs=yes
                ;;
            --)
                shift; break
                ;;
            *)
                btcmn_warn "unknown option \`$1'"
                usage 1 no
                ;;
        esac
        shift
    done
    [ $# -eq 0 ] && usage 1 no

    ret=0
    output=
    while [ $# -gt 0 ]; do
        if echo $1 | grep , >/dev/null; then
            pkgname=$(echo $1 | cut -d , -f 1)
            pkgop=$(echo $1 | cut -d , -f 2)
            pkgver=$(echo $1 | cut -d , -f 3)
        elif echo $1 | grep ' ' >/dev/null; then
            pkgname=$(echo $1 | cut -d ' ' -f 1)
            pkgop=$(echo $1 | cut -d ' ' -f 2)
            pkgver=$(echo $1 | cut -d ' ' -f 3)
        else
            pkgname=$1
            pkgop=
            pkgver=
        fi

        if pkgflags_open ${pkgname}; then
            parse pkgflags ${pkgname} ${pkgop} ${pkgver} || ret=1
            pkgflags_close
        elif pkgconfig_open ${pkgname}; then
            parse pkgconfig ${pkgname} ${pkgop} ${pkgver} || ret=1
            pkgconfig_close
        else
            btcmn_warn "cannot locate flags information for \`${pkgname}'"
            ret=1
        fi
        shift
    done

    [ -n "${output}" ] && echo ${output}

    return ${ret}
}

# Local Variables: ***
# mode: shell-script ***
# End: ***
# vim: syntax=sh