#!/bin/bash

#

# help.sh -- This function initializes the interface used by

# centos-art.sh script to perform documentation tasks through

# different documentation backends.

#

# Copyright (C) 2009, 2010, 2011 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 backends.

    local FLAG_SEARCH=""

    # Initialize manual's language.

    local MANUAL_L10N=$(cli_getCurrentLocale)

    # Initialize manuals's top-level directory. This is the place

    # where the manual will be stored in. To provide flexibility, the

    # current directory where the `centos-art.sh' script was called

    # from is used as manual's top-level directory.  Notice that this

    # relaxation is required because we need to create/maintain

    # manuals both under `trunk/Manuals/' and `branches/Manuals/'

    # directories.

    local MANUAL_TLDIR=${PWD}

    # Verify manual's top-level directory. To prevent messing the

    # things up, we need to restrict the possible locations

    # where documentation manuals can be created in the working copy.

    # When manual's top-level location is other but the ones

    # permitted, use `trunk/Manuals' directory structure as default

    # location to store documentation manuals.

    if [[ ! $MANUAL_TLDIR =~ "^${CLI_WRKCOPY}/(trunk/Manuals|branches/Manuals/[[:alnum:]-]+)$" ]];then

        MANUAL_TLDIR="${CLI_WRKCOPY}/trunk/Manuals"

    fi

    # 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 retrive the

    # information related documentation entries from there.

    help_getEntries

    # Execute backend-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 particularily 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 absolute path to directory holding language-specific

        # directories.

        MANUAL_BASEDIR="${MANUAL_TLDIR}/${MANUAL_DIRN[${MANUAL_DOCENTRY_ID}]}"

        # Define absolute path to directory holding language-specific

        # texinfo 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

        # aboslute path to changed directory to look for changes, the

        # one holding the section entry.  However, when a manual entry

        # is renamed, there are two different locations to look for

        # changes, the source manual removed and the target manual

        # 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}"

        # Define part name.

        MANUAL_PART_NAME=${MANUAL_PART[${MANUAL_DOCENTRY_ID}]}

        # Define part directory.

        MANUAL_PART_DIR="${MANUAL_BASEDIR_L10N}/${MANUAL_PART_NAME}"

        # Define 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' )"

        # 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" 

        # Define documentation backend. 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.).

        if [[ -f ${MANUAL_CONFIG_FILE} ]];then

            # Retrive documentation backend from configuration file.

            MANUAL_BACKEND=$(cli_getConfigValue \

                "${MANUAL_CONFIG_FILE}" "main" "manual_backend")

            # Verify documentation backend. This is required because

            # in order to prevent malformed values from being used. Be

            # sure only supported documentation backends could be

            # provided as value to `manual_backend' option in

            # configuration files.

            if [[ ! $MANUAL_BACKEND =~ '^(texinfo)$' ]];then

                cli_printMessage "`gettext "The documentation backend provided isn't supported."`" --as-error-line

            fi 

        else

            # When the current documentation manual is being created

            # for first time, there's no way to get the documentation

            # backend to use in the future manual, but asking the user

            # creating it which one to use.

            cli_printMessage "`gettext "Select one of the following documentation backends:"`"

            MANUAL_BACKEND=$(cli_printMessage "texinfo" --as-selection-line)

        fi

        # Define absolute path to template directory. This is the

        # place where we store locale directories (e.g., en_US, es_ES,

        # etc.) used to build manuals in texinfo format.

        MANUAL_TEMPLATE=${CLI_FUNCDIR}/${CLI_FUNCDIRNAM}/$(cli_getRepoName \

            ${MANUAL_BACKEND} -d)/Templates

        # Define absolute path to language-specific template

        # directory.  This is the place where we store locale-specific

        # files used to build manuals in texinfo format.

        MANUAL_TEMPLATE_L10N=${MANUAL_TEMPLATE}/${MANUAL_L10N}

        # Verify absolute path to language-speicific template

        # directory.  If it doesn't exist, use English language as

        # default location to retrive template files.

        if [[ ! -d $MANUAL_TEMPLATE_L10N ]];then

            MANUAL_TEMPLATE_L10N=${MANUAL_TEMPLATE}/en_US

        fi

        # Notice that, because we are processing non-option arguments

        # one by one, there is no need to sycronize 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 backends.

        if [[ ${MANUAL_DOCENTRY_ID} -eq 0 \

            || ( ( ${MANUAL_DOCENTRY_ID} -gt 0 ) && ( \

            ${MANUAL_DIRN[${MANUAL_DOCENTRY_ID}]} != ${MANUAL_DIRN[((${MANUAL_DOCENTRY_ID} - 1))]} ) ) ]];then

            # Syncronize 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_syncroRepoChanges ${MANUAL_CHANGED_DIRS}

            fi

            # Initialize documentation backend functionalities. At

            # this point we load all functionalities required into

            # `centos-art.sh''s execution environment and make them

            # available, this way, to perform backend-specific

            # documentation tasks.

            cli_exportFunctions "${CLI_FUNCDIR}/${CLI_FUNCDIRNAM}/$(cli_getRepoName \

                ${MANUAL_BACKEND} -d)" "${MANUAL_BACKEND}"

        fi

        # Execute backend-specific documentation tasks.

        ${MANUAL_BACKEND}

        # 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 backends. Each

        # documentation backend 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 backend

        # functionalities that aren't used in the current

        # documentation entry being processed. In that sake, unset

        # documentation bakend 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 "${CLI_FUNCDIR}/${CLI_FUNCDIRNAM}/$(cli_getRepoName \

                ${MANUAL_BACKEND} -d)" "${MANUAL_BACKEND}"

        fi

        # Increment documentation entry counter id.

        MANUAL_DOCENTRY_ID=$(($MANUAL_DOCENTRY_ID + 1))

    done

    # Syncronize 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_syncroRepoChanges ${MANUAL_CHANGED_DIRS}

}