#!/bin/bash

#

# texinfo_restoreCrossReferences.sh -- This function looks inside

# texinfo source files, from section level on, and restores any cross

# reference related to a documentation entry. This function is used in

# those cases where documentation entries are created/recreated to

# documentation structure. It is a verification that looks for

# matching documentation entries previously defined as removed by

# texinfo_deleteCrossReferences function. The

# texinfo_restoreCrossReferences function relays in the removed

# message format produced by texinfo_deleteCrossReferences

# function, in order to return them back into the link format. 

#

# 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_restoreCrossReferences {

    local -a PATTERN

    local -a REPLACE

    # Define documentation entry.

    local MANUAL_ENTRY="$1"

    # Verify documentation entry. If documentation entry is empty,

    # stop script execution with an error message.

    if [[ $MANUAL_ENTRY == '' ]];then

        cli_printMessage "`gettext "The first positional parameter cannot be empty."`" --as-error-line

    fi

    # Build the node string using entry location.

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

    # Define regular expression patterns to match removed message

    # format produced by message_removeCrossReferences function.

    PATTERN[0]="--- @strong\{`gettext "Removed"`\}\((pxref|xref|ref):(${NODE})\) ---"

    PATTERN[1]="^@comment --- `gettext "Removed"`\((\* ${NODE}:(.*)?:(.*)?)\) ---$"

    # Define replacement string to turn removed message back to cross

    # reference link.

    REPLACE[0]='@\1{\2}'

    REPLACE[1]='\1'

    # 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!\<${PATTERN[0]}\>!${REPLACE[0]}!g;ba" ${MANUAL_ENTRIES}

    # Update menu-related cross references. Menu-related cross

    # references hardly appear in more than one line, so there is no

    # need to complicate the replacement command.

    sed -r -i "s!\<${PATTERN[1]}\>!${REPLACE[1]}!" ${MANUAL_ENTRIES}

}