Blame Scripts/Functions/Help/Backends/Texinfo/texinfo_deleteCrossReferences.sh

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#!/bin/bash
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#
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# texinfo_deleteCrossReferences.sh -- This function looks inside
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# texinfo source files, from section level on, and removes all cross
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# referece definitions related to a documentation entry. Use this
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# function in coordination with texinfo_deleteEntry function, in order
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# to keep cross reference information, inside the documentation
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# manual, syncronized.
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#
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# Copyright (C) 2009, 2010, 2011 The CentOS Project
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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# ----------------------------------------------------------------------
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# $Id$
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# ----------------------------------------------------------------------
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function texinfo_deleteCrossReferences {
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    local -a PATTERN
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    local -a REPLACE
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    # Define documentation entry.
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    local MANUAL_ENTRY="$1"
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    # Verify documentation entry. If documentation entry is empty,
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    # stop script execution with an error message.
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    if [[ $MANUAL_ENTRY == '' ]];then
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        cli_printMessage "`gettext "The first positional parameter cannot be empty."`" --as-error-line
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    fi
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    # Build the node string using entry location.
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    local NODE=$(${FLAG_BACKEND}_getNode "$MANUAL_ENTRY")
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    # Define regular expression patterns for texinfo cross reference
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    # commands.
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    PATTERN[0]="@(pxref|xref|ref)\{(${NODE})\}"
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    PATTERN[1]="^(\* ${NODE}:(.*)?:(.*)?)$"
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    # Define replacement string for missing entries. It is convenient
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    # to keep missing entries in documentation for documentation team
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    # to know. Removing the missing cross reference may intorudce
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    # confussion. Imagine that! you are spending lots of hours in an
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    # article and suddenly one of your cross refereces disappears with
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    # no visible reason, with the next working copy update you
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    # perform. That's frustrating. Instead, when centos-art.sh script
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    # finds a missing cross reference it removes the link and remark
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    # the issue for you to act on it.
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    REPLACE[0]='--- @strong{'`gettext "Removed"`'}(\1:\2) ---'
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    REPLACE[1]='@comment --- '`gettext "Removed"`'(\1) ---'
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    # Define list of entries to process.
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    local MANUAL_ENTRIES=$(cli_getFilesList ${MANUAL_BASEDIR} --pattern=".*\.${FLAG_BACKEND}")
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    # Update node-related cross references. The node-related cross
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    # reference definition, long ones specially, could require more
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    # than one line to be set. By default, GNU sed does not matches 
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    # newline characters in the pattern space, so we need to make use
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    # of `label' feature and the `N' command in order to build a
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    # pattern space that includes the newline character in it. Here we
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    # use the `a' letter to name the label we use, followed by N
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    # command to add a newline to the pattern space, the s command to
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    # make the pattern replacement using the `g' flag to make it
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    # global and finaly the command `b' to branch label named `a'.
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    #
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    # Inside the pattern space, the `\<' and `\>' are used to restrict
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    # the match pattern to a word boundary. The word boundary
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    # restriction applied here is required to avoid undesired
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    # replacements when we replace singular words with their plurals.
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    # For example, if we need to change the word `Manual' to its
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    # plular (i.e., `Manuals'), and no boundary restriction is used in
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    # the pattern space to do that, we might end up having words like
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    # `Manualsssss'. This is because this sed command might be applied
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    # to the same file many times; and each time it is applied a new
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    # `Manuals' replaces the previous `Manuals' replacement to form
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    # `Manualss', `Manualsss', and so on for each interaction.
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    sed -r -i ":a;N;s!\<${PATTERN[0]}\>!${REPLACE[0]}!g;ba" ${MANUAL_ENTRIES}
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    # Update menu-related cross references. Menu-related cross
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    # references hardly appear in more than one line, so there is no
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    # need to complicate much the replacement command.
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    sed -r -i "s!\<${PATTERN[1]}\>!${REPLACE[1]}!" ${MANUAL_ENTRIES}
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}