#!/bin/bash

#

# texinfo_updateMenu.sh -- This function updates chapter's menu

# definition file.  If this function is called with the 'remove-entry'

# string as first argument, the menu line related to the entry being

# processed is removed. Otherwise, if this function is called with the

# 'update-entry' string as first argument, the menu line related to

# the entry being processed is added to menu's bottom.  If no argument

# is passed to this function, the 'update-entry' action is assumed.

#

# 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_updateMenu {

    # Specify which action to do with documentation entry inside the

    # chapter menu.

    local ACTION="$1"

    # Build node information used inside chapter menu.

    local MENUNODE=$(${FLAG_BACKEND}_getNode "$MANUAL_ENTRY")

    # Define menu entry using texinfo style and node information as

    # reference.

    local MENULINE="* ${MANUAL_CHAPTER_NAME} ${MENUNODE}::" 

    # Retrive list of menu entries from chapter menu and exclude

    # `@menu', `@end menu' and empty lines from output.

    local MENU=$(cat $MANUAL_CHAPTER_DIR/chapter-menu.${MANUAL_EXTENSION} \

        | egrep -v '^[[:space:]]*$' | egrep -v '^@(end )?menu')

    # Re-defined chapter menu entries based on action provided to this

    # function as first positional parameter.

    case $ACTION in

        'remove-entry' )

            # Remove menu entry from chapter menu.

            MENU=$(echo "$MENU" | egrep -v "$MENULINE")

            ;;

        'update-entry' | * )

            # Add menu entry to chapter menu list as last entry.

            MENU="$MENU

            $MENULINE"

            ;;

    esac

    # Remove empty lines from chapter menu entries. Don't order

    # alphabetically.  That would suppress the idea of putting the

    # last entry added as last entry in the chapter menu entries.

    MENU=$(echo "$MENU" | egrep -v '^[[:space:]]*$')

    # Rebuild list of chapter menu entries including '@menu' and '@end

    # menu' lines back into chapter menu.

    MENU="@menu

    $MENU

    @end menu"

    # Remove opening spaces/tabs from final menu structure.

    MENU=$(echo "$MENU" | sed -r 's!^[[:space:]]+!!g')

    # Dump chapter menu entries back into chapter's menu definition

    # file.

    echo "$MENU" > $MANUAL_CHAPTER_DIR/chapter-menu.${MANUAL_EXTENSION}

}