#!/bin/bash

#

# help_renameCrossReferences.sh -- This function replaces a node

# pattern with a node replacement and updates cross-reference

# definitions to reflect the changes.

#

# Copyright (C) 2009-2011 Alain Reguera Delgado

# 

# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307

# USA.

# 

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

# $Id$

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

function help_renameCrossReferences {

    local NODE=''

    local COUNT=1

    local ENTRIES=''

    local NODE_SRC=''

    local NODE_DST=''

    # Define node pattern for source documenation entry.

    NODE_SRC=$(echo "$ENTRY" \

        | cut -d / -f8- \

        | tr '/' ' ' \

        | sed -r \

            -e "s/(chapter-intro\.texi|\.texi)$//" \

            -e 's! !( |\\n)!g')

    # Define node replacement for target documentation entry.

    NODE_DST=$(echo "$FLAG_TO" \

        | cut -d / -f8- \

        | tr '/' ' ' \

        | sed -r \

            -e "s/(chapter-intro\.texi|\.texi)$//")

    # Sanitate node replacement for target documentation entry to make

    # use of regular expression positional markers, so the word

    # separator character found by node pattern could be used.

    for NODE in $NODE_DST;do

        if [[ $COUNT -eq 1 ]];then 

            NODE_DST="${NODE}\\${COUNT}"

        else

            NODE_DST="${NODE_DST}$(echo "${NODE}\\${COUNT}")"

        fi

        COUNT=$(($COUNT + 1))

    done

    # Remove last positional marker from node replacement.

    NODE_DST=$(echo $NODE_DST | sed -r 's!\\[[:digit:]]$!!')

    # Define list of entries to process.

    ENTRIES=$(cli_getFilesList "${MANUAL_BASEDIR}" '.*\.texi')

    # Set action preamble.

    cli_printActionPreamble "$ENTRIES" '' ''

    # Update node-related cross-references. The node-related cross

    # reference definition, long ones specially, could require more

    # than one line to be set. By default, GNU sed does not matches 

    # newline characters in the pattern space, so we need to make use

    # of `label' feature and the `N' command in order to build a

    # pattern space that includes the newline character in it. Here we

    # use the `a' letter to name the label we use, followed by N

    # command to add a newline to the pattern space, the s command to

    # make the pattern replacement using the `g' flag to make it

    # global and finaly the command `b' to branch label named `a'.

    sed -r -i ":a;N;s!${NODE_SRC}!${NODE_DST}!g;ba" ${ENTRIES}

    # At this point, source documentation entry has been renamed from

    # source to target documentation entry, but they are still

    # commented. So, restore target documentation entries.

    help_restoreCrossReferences "${FLAG_TO}"

}