#!/bin/bash
######################################################################
#
#   cli_exportFunctions.sh -- This function standardizes the way
#   specific functionalities are exported to centos-art.sh script
#   environment.
#
#   Written by: 
#   * Alain Reguera Delgado <al@centos.org.cu>, 2009-2013
#     Key fingerprint = D67D 0F82 4CBD 90BC 6421  DF28 7CCE 757C 17CA 3951
#
# 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.
#
######################################################################

function cli_exportFunctions {

    # Retrieve export identifier for the function we want to export.
    local FUNCTION_EXPORTID="${1}"

    # Verify the export identification existence. This argument must
    # be passed as first argument and match a relative path format.
    if [[ ! ${FUNCTION_EXPORTID} =~ '^[A-Z][[:alpha:]]+(/[[:alpha:]_]+)+$' ]];then
        cli_printMessage "`gettext "The function's export id doesn't match its pattern."`" --as-error-line
    fi

    # Define the source location where function files are placed in.
    local FUNCTION_LOCATION=${TCAR_CLI_MODSDIR}/$(dirname ${FUNCTION_EXPORTID})

    # Define suffix used to retrieve function files.
    local FUNCTION_SUFFIX=$(basename "${FUNCTION_EXPORTID}")

    # Verify the suffix value used to retrieve function files.
    # Assuming no suffix value is passed as second argument to this
    # function, use the function name value (CLI_FUNCTION_NAME) as default
    # value.
    if [[ -z ${FUNCTION_SUFFIX} ]];then
        FUNCTION_SUFFIX="${CLI_FUNCTION_NAME}"
    fi

    # Redefine suffix to match all related function files inside the
    # related function directory.
    FUNCTION_SUFFIX=${FUNCTION_SUFFIX}'[[:alpha:]_]*'

    # Define the pattern used to retrieve function names from function
    # files.
    local FUNCTION_PATTERN="^function[[:space:]]+${FUNCTION_SUFFIX}[[:space:]]+{[[:space:]]*$"

    # Define the list of files.
    local FUNCTION_FILE=''
    local FUNCTION_FILES=$(cli_getFilesList ${FUNCTION_LOCATION} \
        --pattern="${FUNCTION_LOCATION}/${FUNCTION_SUFFIX}\.sh$" \
        --maxdepth='1' --mindepth='1' --type='f')

    # Verify the list of files. If no function file exists for the
    # location specified stop the script execution. Otherwise the
    # script will surely try to execute a function that haven't been
    # exported yet and report an error about it.
    if [[ -z ${FUNCTION_FILES} ]];then
        cli_printMessage "${FUNCNAME}: `gettext "No function file was found."`" --as-error-line
    fi

    # Process the list of files.
    for FUNCTION_FILE in ${FUNCTION_FILES};do

        # Verify the execution rights for function file.
        cli_checkFiles -x ${FUNCTION_FILE}

        # Verify that function files have not been already exported.
        # If they have been already exported don't export them again.
        # Instead, continue with the next function file in the list.
        declare -F | gawk '{ print $3 }' | egrep "^${FUNCTION_FILE}$" > /dev/null
        if [[ $? -eq 0 ]];then
            continue
        fi

        # Initialize the function file.
        . ${FUNCTION_FILE}

        # Export the function names inside the file to current shell
        # script environment.
        export -f $(egrep "${FUNCTION_PATTERN}" ${FUNCTION_FILE} | gawk '{ print $2 }')

    done

}