#!/bin/bash

#

# texinfo_makeSeeAlso.sh -- This function creates a list of links with

# section entries one level ahead from the current section entry being

# processed. Desition of what of these texinfo definitions to use is

# set inside the section entry itself, through the following

# construction:

#

# @c -- <[centos-art(SeeAlso,TYPE)

# @c -- ]>

#

# In this construction, the TYPE variable can be either `itemize',

# `enumerate' or `menu'.

#

# Copyright (C) 2009-2013 The CentOS Project

#

# 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_makeSeeAlso {

    # Initialize variables.

    local CHILD_ENTRIES=''

    local CHILD_ENTRY=''

    local ENTRY_PATTERN=''

    local LIST_DEF=''

    local LIST_ENTRIES=''

    local LIST_TYPE=''

    local LIST_TYPE_PATTERN=''

    local MANUAL_ENTRY=''

    local TMARK=''

    local TMARK_PATTERN=''

    local TMARKS=''

    # Define absolute path to section entry.

    MANUAL_ENTRY="$1"

    # Verify section entry. When section entries are deleted, there is

    # no menu definition to set.

    if [[ ! -f $MANUAL_ENTRY ]];then

        return

    fi

    # Define `SeeAlso' translation marker regular expression pattern.

    TMARK_PATTERN="^@c -- <\[${CLI_NAME}\(SeeAlso(,(itemize|enumerate|menu))?\)$"

    # Retrieve `SeeAlso' translation marker definition lines. Be sure

    # to retrieve unique definitions only. If the same definition is

    # present more than once, it will be expanded in one pass. There's

    # no need to go through different passes in order to expand

    # repeated translation marker definition.

    TMARKS=$(egrep "${TMARK_PATTERN}" $MANUAL_ENTRY | sort | uniq)

    # Remove spaces from translation marker definition lines in order

    # to process them correctly. Otherwise the definition line would

    # be broken on each space character and then that wouldn't be the

    # definition line we initially conceived.

    TMARKS=$(echo "$TMARKS" | sed -r 's/ /\\040/g')

    # Define pattern used to build list of child sections. A child

    # section shares the same path information of its parent without

    # file extension. For example, if you have the `identity',

    # `identity-images' and `identity-images-themes' section entries,

    # `identity-images' is a child entry of `identity' likewise

    # `identity-images-themes' is a child entry of `identity-images'.

    ENTRY_PATTERN=$(echo "$MANUAL_ENTRY" | sed -r "s/\.${MANUAL_EXTENSION}$//")

    # Define list of child entries we'll use as reference to build the

    # menu nodes. Reverse the output here to produce the correct value

    # based on menu nodes definition set further.

    CHILD_ENTRIES=$(cli_getFilesList $(dirname ${MANUAL_ENTRY}) \

        --pattern="^${ENTRY_PATTERN}-[[:alnum:]]+\.${MANUAL_EXTENSION}$" | sort -r | uniq )

    # Loop through translation marker definition lines.

    for TMARK in $TMARKS;do

        # Define list type based on translation marker definition.

        # Remember to revert back the space character transformation

        # we previously did, in order for the translation marker

        # regular expression pattern to match.

        LIST_TYPE=$(echo "$TMARK" | sed -r -e 's/\\040/ /g' -e "s/${TMARK_PATTERN}/\2/")

        # Define list type default value.  This is, the list type used

        # when no list type is specified in the translation marker

        # construction properties field.

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

            LIST_TYPE="itemize"

        fi

        # Define list properties (type included).

        LIST_PROP=$(echo "$TMARK" | sed -r -e 's/\\040/ /g' -e "s/${TMARK_PATTERN}/\1/")

        # Define `SeeAlso' translation marker regular expression

        # pattern that matches the translation marker definition.

        # Notice that we cannot use TMARK_PATTERN here because it

        # includes a selection list of all possible translation

        # markers that can provided and here we need to precisely set

        # the one being currently processed, not those whose could be

        # processed.

        LIST_TYPE_PATTERN="^@c -- <\[${CLI_NAME}\(SeeAlso${LIST_PROP}\)$"

        # Redefine list's entry based on translation marker definition.

        if [[ $LIST_TYPE =~ '^menu$' ]];then

            for CHILD_ENTRY in $CHILD_ENTRIES;do

                LIST_ENTRIES="* $(texinfo_getEntryNode "$CHILD_ENTRY")::\n${LIST_ENTRIES}"

            done

        elif [[ $LIST_TYPE =~ '^(itemize|enumerate)$' ]];then 

            for CHILD_ENTRY in $CHILD_ENTRIES;do

                LIST_ENTRIES="@item @ref{$(texinfo_getEntryNode "$CHILD_ENTRY")}\n${LIST_ENTRIES}"

            done

        else

            # When an translation marker isn't recognize, go on with

            # the next one in the list.

            continue

        fi

        # Define menu using menu nodes.

        LIST_DEF="@c -- <[${CLI_NAME}(SeeAlso${LIST_PROP})\n@${LIST_TYPE}\n${LIST_ENTRIES}@end ${LIST_TYPE}\n@c -- ]>"

        # Expand list definition using translation marker and list

        # definition itself. Be sure that no expansion be done when

        # the closing tag of translation marker isn't specified.

        # Otherwise, there might be lost of content.

        sed -r -i "/${LIST_TYPE_PATTERN}/{:a;N;/\n@c -- ]>$/!ba;s/.*/${LIST_DEF}/;}" $MANUAL_ENTRY

        # Clean up both list definition and list entries. Otherwise

        # undesired concatenations happen.

        LIST_DEF=''

        LIST_ENTRIES=''

        LIST_TYPE=''

    done

}