#!/bin/bash
#
# help.sh -- This function initializes the interface used by
# centos-art.sh script to perform documentation tasks through
# different documentation formats.
#
# Copyright (C) 2009, 2010, 2011, 2012 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 help {

    # Initialize action name with an empty value.
    local ACTIONNAM=''

    # Initialize search option (`--search'). This option is used to
    # look for documentation inside documentation formats.
    local FLAG_SEARCH=""

    # Initialize manual's language.
    local MANUAL_L10N=${CLI_LANG_LC}

    # Initialize manuals' top-level directory. This is the place where
    # source files for documentation manuals will be stored in. 
    local MANUAL_TLDIR="${TCAR_WORKDIR}/Documentation/Models"

    # Initialize documentation format. This information defines the
    # kind of source files we work with inside the documentation
    # manual as well as the kind of actions required by them to
    # perform actions related to document management (e.g., creation,
    # edition, deletion, copying, renaming, etc.). By default texinfo
    # format is used. Other formats can be specified in the
    # command-line using the `--format' option.
    local FLAG_FORMAT='texinfo'

    # Initialize specific function export id. This value is redefined
    # later once we know which is the documentation format.
    local EXPORTID=''

    # Initialize documentation entries arrays. Arrays defined here
    # contain all the information needed to process documentation
    # entries (e.g., manual, part, chapter and section).
    local -a MANUAL_SLFN
    local -a MANUAL_DIRN
    local -a MANUAL_PART
    local -a MANUAL_CHAP
    local -a MANUAL_SECT

    # Initialize documentation entries counter.
    local MANUAL_DOCENTRY_COUNT=0
    local MANUAL_DOCENTRY_ID=0

    # Interpret option arguments passed through the command-line.
    help_getOptions

    # Redefine arrays related to documentation entries using
    # non-option arguments passed through the command-line. At this
    # point all options have been removed from ARGUMENTS and
    # non-option arguments remain. Evaluate ARGUMENTS to retrieve the
    # information related documentation entries from there.
    help_getEntries

    # Execute format-specific documentation tasks for each
    # documentation entry specified in the command-line, individually.
    # Notice that we've stored all documentation entries passed as
    # non-option arguments in array variables in order to process them
    # now, one by one.  This is particularly useful when we need to
    # reach items in the array beyond the current iteration cycle. For
    # example, when we perform actions that require source and target
    # locations (e.g., copying and renaming): we use the current value
    # as source location and the second value in the array as target
    # location; both defined from the first iteration cycle.
    while [[ $MANUAL_DOCENTRY_ID -lt $MANUAL_DOCENTRY_COUNT ]];do

        # Define name used by manual's main definition file.
        MANUAL_NAME=${MANUAL_SLFN[${MANUAL_DOCENTRY_ID}]}

        # Define extension used by documentation manuals. The
        # extension used must be the same passed in the format option.
        MANUAL_EXTENSION=${FLAG_FORMAT}

        # Define absolute path to directory holding language-specific
        # models.
        MANUAL_BASEDIR="${MANUAL_TLDIR}/$(cli_getRepoName \
            ${MANUAL_EXTENSION} -d)/${MANUAL_DIRN[${MANUAL_DOCENTRY_ID}]}"

        # Define absolute path to directory holding language-specific
        # source files.
        MANUAL_BASEDIR_L10N="${MANUAL_BASEDIR}/${MANUAL_L10N}"

        # Define absolute path to changed directories inside the
        # manual. For example, when a section entry is edited, copied
        # or renamed inside  the same manual there is only one
        # absolute path to look for changes, the one holding the
        # section entry.  However, when an entire manual is renamed,
        # there might be two different locations to look changes for,
        # the source location deleted and the target location added.
        MANUAL_CHANGED_DIRS="${MANUAL_BASEDIR_L10N}"

        # Define absolute path to base file. This is the main file
        # name (without extension) we use as reference to build output
        # files in different formats (.info, .pdf, .xml, etc.).
        MANUAL_BASEFILE="${MANUAL_BASEDIR_L10N}/${MANUAL_NAME}"

        # Redefine function export id based on documentation format.
        EXPORTID="${CLI_FUNCDIRNAM}/$(cli_getRepoName ${MANUAL_EXTENSION} -d)/${MANUAL_EXTENSION}"

        # Define manual base file used for output.
        MANUAL_OUTPUT_BASEFILE=$(echo $MANUAL_BASEFILE | sed -r 's!Models/!Manuals/!')

        # Define manual's part name.
        MANUAL_PART_NAME=${MANUAL_PART[${MANUAL_DOCENTRY_ID}]}

        # Define absolute path to manual's part directory.
        MANUAL_PART_DIR="${MANUAL_BASEDIR_L10N}/${MANUAL_PART_NAME}"

        # Define manual's chapter name.
        MANUAL_CHAPTER_NAME=${MANUAL_CHAP[${MANUAL_DOCENTRY_ID}]}

        # Define absolute path to chapter's directory. This is the
        # place where chapter-specific files are stored in. Be sure no
        # extra slash be present in the value (e.g., when the part
        # name isn't provided).
        MANUAL_CHAPTER_DIR="$(echo ${MANUAL_PART_DIR}/${MANUAL_CHAPTER_NAME} \
            | sed -r 's!/{2,}!/!g' | sed -r 's!/$!!' )"

        # Define section name.
        MANUAL_SECTION_NAME=${MANUAL_SECT[${MANUAL_DOCENTRY_ID}]}

        # Define absolute path to manual's configuration file.  This
        # is the file that controls the way template files are applied
        # to documentation entries once they have been created as well
        # as the style and order used for printing sections. 
        MANUAL_CONFIG_FILE="${MANUAL_BASEFILE}.conf" 

        # Notice that, because we are processing non-option arguments
        # one by one, there is no need to synchronize changes or
        # initialize functionalities to the same manual time after
        # time (assuming all documentation entries passed as
        # non-option arguments refer the same manual directory name).
        # That would be only necessary when documentation entries
        # refer to different manual directory names that could be
        # written in different documentation formats.
        if [[ ${MANUAL_DOCENTRY_ID} -eq 0 \
            || ( ( ${MANUAL_DOCENTRY_ID} -gt 0 ) && ( \
            ${MANUAL_DIRN[${MANUAL_DOCENTRY_ID}]} != ${MANUAL_DIRN[((${MANUAL_DOCENTRY_ID} - 1))]} ) ) ]];then

            # Synchronize changes between repository and working copy.
            # At this point, changes in the repository are merged in
            # the working copy and changes in the working copy
            # committed up to repository.
            if [[ -d ${MANUAL_CHANGED_DIRS} ]];then
                cli_synchronizeRepoChanges "${MANUAL_CHANGED_DIRS}"
            fi

            # Initialize documentation format functionalities. At
            # this point we load all functionalities required into
            # `centos-art.sh''s execution environment and make them
            # available, this way, to perform format-specific
            # documentation tasks.
            cli_exportFunctions "${EXPORTID}"

        fi

        # Execute format-specific documentation tasks.
        ${MANUAL_EXTENSION}

        # Unset the exported functions before go on with the next
        # documentation entry provided as non-option argument to
        # `centos-art.sh' script. Different documentation entries may
        # be written in different documentation formats. Each
        # documentation format is loaded in order to perform their
        # related documentation tasks. Assuming more that one
        # documentation entry be passed as non-option argument to
        # `centos-art.sh' script and they are written in different
        # formats, we might end up loading documentation format
        # functionalities that aren't used in the current
        # documentation entry being processed. In that sake, unset
        # documentation back-end functionalities when the next
        # documentation entry refers to a manual directory different
        # to that one being currently processed.
        if [[ ${MANUAL_DOCENTRY_ID} -gt 0 \
            && ${MANUAL_DIRN[${MANUAL_DOCENTRY_ID}]} != ${MANUAL_DIRN[((${MANUAL_DOCENTRY_ID} + 1))]} ]];then
            cli_unsetFunctions "${EXPORTID}"
        fi

        # Increment documentation entry counter id.
        MANUAL_DOCENTRY_ID=$(($MANUAL_DOCENTRY_ID + 1))

    done

    # Synchronize changes between repository and working copy. At this
    # point, changes in the repository are merged in the working copy
    # and changes in the working copy committed up to repository.
    cli_synchronizeRepoChanges "${MANUAL_CHANGED_DIRS}"

}