#!/bin/bash

#

# texinfo_renameCrossReferences.sh -- This function replaces a node

# pattern with a node replacement and updates cross-reference

# definitions to reflect the changes.

#

# 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_renameCrossReferences {

    local MANUAL_ENTRY_SRC=$(${FLAG_BACKEND}_getEntry "$1")

    local MANUAL_ENTRY_DST=$(${FLAG_BACKEND}_getEntry "$2")

    # Define node pattern for source documenation entry.

    local NODE_SRC=$(${FLAG_BACKEND}_getNode "$MANUAL_ENTRY_SRC")

    # Define node replacement for target documentation entry.

    local NODE_DST=$(${FLAG_BACKEND}_getNode "$MANUAL_ENTRY_DST")

    # Define list of entries to process.

    local MANUAL_ENTRIES=$(cli_getFilesList ${MANUAL_BASEDIR} \

        --pattern=".*\.${MANUAL_EXTENSION}")

    # 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'.

    #

    # Inside the pattern space, the `\<' and `\>' are used to restrict

    # the match pattern to a word boundary. The word boundary

    # restriction applied here is required to avoid undesired

    # replacements when we replace singular words with their plurals.

    # For example, if we need to change the word `Manual' to its

    # plular (i.e., `Manuals'), and no boundary restriction is used in

    # the pattern space to do that, we might end up having words like

    # `Manualsssss'. This is because this sed command might be applied

    # to the same file many times; and each time it is applied a new

    # `Manuals' replaces the previous `Manuals' replacement to form

    # `Manualss', `Manualsss', and so on for each interaction.

    sed -r -i ":a;N;s!\<${NODE_SRC}\>!${NODE_DST}!g;ba" ${MANUAL_ENTRIES}

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

    # source to target documentation entry, but they are still

    # commented. So, uncomment them restoring target documentation

    # entries.

    ${FLAG_BACKEND}_restoreCrossReferences "${MANUAL_ENTRY_DST}"

}