#!/bin/bash

#

# help_deleteCrossReferences.sh -- This function looks inside

# texinfo source files, from section level on, and removes all cross

# referece definitions related to a documentation entry. Use this

# function in coordination with help_deleteEntry function, in order

# to keep cross reference information, inside the documentation

# manual, syncronized.

#

# 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., 675 Mass Ave, Cambridge, MA 02139, USA.

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

# $Id$

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

function help_deleteCrossReferences {

    local -a PATTERN

    local -a REPLACE

    local LOCATION=''

    # Define entry location. Verify first argument to make this

    # function reusable. If no value is passed as first argument use

    # entry global information value as default value instead.

    if [[ "$1" != '' ]];then

        LOCATION="$1"

    else

        LOCATION="$ENTRY"

    fi

    # Build the node string using entry location.

    local NODE=$(echo "$LOCATION" \

        | cut -d / -f7- \

        | tr '/' ' ' \

        | sed -r \

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

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

    # Define regular expression patterns for texinfo cross reference

    # commands.

    PATTERN[0]="@(pxref|xref|ref)\{(${NODE})\}"

    PATTERN[1]="^(\* ${NODE}:(.*)?:(.*)?)$"

    # Define replacement string for missing entries. It is convenient

    # to keep missing entries in documentation for documentation team

    # to know. Removing the missing cross reference may intorudce

    # confussion. Imagine that! you are spending lots of hours in an

    # article and suddenly one of your cross refereces disappears with

    # no visible reason, with the next working copy update you

    # perform. That's frustrating. Instead, when centos-art.sh script

    # finds a missing cross reference it removes the link and remark

    # the issue for you to act on it.

    REPLACE[0]='--- @strong{'`gettext "Removed"`'}(\1:\2) ---'

    REPLACE[1]='@comment --- '`gettext "Removed"`'(\1) ---'

    # Define list of entries to process.

    local 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!${PATTERN[0]}!${REPLACE[0]}!g;ba" ${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]}!" ${ENTRIES}

}