#!/bin/bash

#

# texinfo_updateSectionMenu.sh -- This function updates the section's

# menu definition file of a chapter.  If this function is called with

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

# to the entry being processed is removed. Otherwise, if this function

# is called with the '--add-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 '--add-entry' action

# is assumed.

#

# Copyright (C) 2009-2013 The CentOS Project

#

# 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_updateSectionMenu {

    # Specify which action to do with documentation entry inside the

    # chapter menu.

    local ACTION="$1"

    # Define section order. Through this property you can customize

    # the section order inside the manual.  Possible arguments to this

    # option are `ordered', `reversed', `created'.  From these three

    # values `created' is used by default (i.e., new menu entries are

    # added to menu's bottom as last entry.).  Notice that, once

    # you've sorted the menu using `ordered' or `reversed' values, it

    # is hard to sort the list back to former creation orders. Go

    # sorted or not sorted at all.

    local MANUAL_SECTION_ORDER=$(cli_getConfigValue "${MANUAL_CONFIG_FILE}" "main" "manual_section_order")

    if [[ ! $MANUAL_SECTION_ORDER =~ '^(created|ordered|reversed)$' ]];then

        MANUAL_SECTION_ORDER='created'

    fi

    # Build node information used inside chapter menu.

    local MENUNODE=$(texinfo_getEntryNode "$MANUAL_ENTRY")

    # Define menu entry using texinfo style and node information as

    # reference.

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

    # Retrieve list of menu entries from chapter menu and exclude

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

    local MENU=$(cat  ${MENUFILE} \

        | 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

        --delete-entry )

            # Remove menu entry from chapter menu.

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

            ;;

        --add-entry | * )

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

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

                ${MENULINE}"

            ;;

    esac

    # Remove opening spaces/tabs and empty lines from final menu

    # entries.

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

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

    # Sort menu entries based on section order property.

    case $MANUAL_SECTION_ORDER in

        'ordered' )

            MENU="$(echo "$MENU" | sort )"

            ;;

        'reversed' )

            MENU="$(echo "$MENU" | sort -r )"

            ;;

    esac

    # 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 and empty lines from final menu

    # structure.

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

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

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

    # file.

    echo "$MENU" > ${MENUFILE}

}