#!/bin/bash

#

# texinfo_updateChapterMenu.sh -- This function updates chapter menu.

#

# Copyright (C) 2009, 2010, 2011 The CentOS Artwork SIG

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or (at

# your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#

# ----------------------------------------------------------------------

# $Id$

# ----------------------------------------------------------------------

function texinfo_updateChapterMenu {

    local ACTION=$1

    local MENUCHAPTERS=''

    # Build menu of chapters. The Index node is not included as other

    # nodes are. The Index node is defined inside the master texinfo

    # file (repository.texinfo) as an included file. To create the final

    # .info file correctly, the Index line in the menu should remain,

    # even no other node exist.

    if [[ -f ${MANUAL_BASEFILE}-menu.${MANUAL_EXTENSION} ]];then

        MENUCHAPTERS=$(cat ${MANUAL_BASEFILE}-menu.${MANUAL_EXTENSION} \

            | egrep -v "^@(end )?menu$" \

            | egrep -v '^\* (Licenses|Index)::$')

    fi

    # Re-defined menu of chapters based on action.

    case $ACTION in

        --delete-entry )

            # Remove chapter from menu.

            MENUCHAPTERS=$(echo "${MENUCHAPTERS}" \

                | egrep -v '^\* '"${MANUAL_CHAPTER_NAME}"'::[[:print:]]*$')

            ;;

        --add-entry | * )

            # Update chapter menu using texinfo format. Be sure the

            # chapter node itself is not included here, that would

            # duplicate it inside the menu definition file which end

            # up being a definition error. Take care the way you quote

            # egrep's pattern, prevent to end up using the syntax

            # `$"..."' which has security risks.

            MENUCHAPTERS="$(echo "${MENUCHAPTERS}" \

                | egrep -v '\* '"${MANUAL_CHAPTER_NAME}"'::[[:print:]]*$')

                * ${MANUAL_CHAPTER_NAME}::"

            ;;

    esac

    # Remove opening spaces/tabs and empty line from the menu of

    # chapters. Empty lines may occur the first time the menu of

    # chapters is created.

    MENUCHAPTERS=$(echo "${MENUCHAPTERS}" | sed -r 's!^[[:space:]]+!!' \

        | egrep -v '^[[:space:]]*$')

    # Organize menu of chapters alphabetically and verify that no

    # duplicated line be included on the list. Notice that organizing

    # menu this way supresses the idea of putting the last chapter

    # created at the end of the list. 

    #MENUCHAPTERS=$(echo "${MENUCHAPTERS}" | sort | uniq)

    # Give format to final menu output.

    MENUCHAPTERS="@menu

    ${MENUCHAPTERS}

    * Licenses::

    * Index::

    @end menu"

    # Remove opening space/tabs from menu's final definition.

    MENUCHAPTERS=$(echo "${MENUCHAPTERS}" | sed -r 's!^[[:space:]]+!!' \

        | egrep -v '^[[:space:]]*$')

    # Dump organized menu of chapters into file.

    echo "${MENUCHAPTERS}" > ${MANUAL_BASEFILE}-menu.${MANUAL_EXTENSION}

}