#!/bin/bash

######################################################################

#

#   tcar_getPathComponent.sh -- This function standardizes the way

#   directory structures are organized inside the working copy of

#   CentOS Artwork Repository. You can use this function to retrieve

#   information from paths (e.g., releases, architectures and theme

#   artistic motifs) or the patterns used to build the paths.

#

#   Written by:

#   * Alain Reguera Delgado <al@centos.org.cu>, 2009-2013

#

# Copyright (C) 2009-2013 The CentOS Artwork SIG

#

# 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 tcar_getPathComponent {

    # Define short options.

    local ARGSS=''

    # Define long options.

    local ARGSL='release,release-major,release-minor,release-pattern,architecture,architecture-pattern,motif,motif-name,motif-version,motif-pattern,repo-dir'

    # Define release pattern.

    local VERSION="(([[:digit:]]+)(\.([[:digit:]]+))?)"

    # Define architecture pattern. Make it match the architectures the

    # CentOS distribution is able to be installed on.

    local ARCHITECTURE="(i386|x86_64)"

    # Define regular expression pattern that match the theme artistic

    # motif component inside the path strings.

    local THEME_MOTIF="Themes/Motifs/(([[:alnum:]]+)/(${VERSION}))"

    # Initialize arguments with an empty value and set it as local

    # variable to this function scope. Doing this is very important to

    # avoid any clash with higher execution environments.

    local TCAR_ARGUMENTS=''

    # Process all arguments currently available in this function

    # environment. If either ARGSS or ARGSL local variables have been

    # defined, argument processing goes through getopt for validation.

    tcar_setArguments "${@}"

    # Redefine positional parameters using TCAR_ARGUMENTS variable.

    eval set -- "${TCAR_ARGUMENTS}"

    # Define location we want to apply verifications to.

    local LOCATION=$(echo ${@} | sed -r 's!^.*--[[:space:]](.+)$!\1!')

    # Look for options passed through positional parameters.

    while true;do

        case "${1}" in

            --release )

                echo "${LOCATION}" | egrep "${VERSION}" | sed -r "s!.*/${VERSION}/.*!\1!"

                shift 1

                break

                ;;

            --release-major )

                echo "${LOCATION}" | egrep "${VERSION}" | sed -r "s!.*/${VERSION}/.*!\2!"

                shift 1

                break

                ;;

            --release-minor )

                echo "${LOCATION}" | egrep "${VERSION}" | sed -r "s!.*/${VERSION}/.*!\4!"

                shift 1

                break

                ;;

            --release-pattern )

                echo "${VERSION}"

                shift 1

                break

                ;;

            --architecture )

                echo "${LOCATION}" | egrep "${ARCHITECTURE}" | sed -r "s!${ARCHITECTURE}!\1!"

                shift 1

                break

                ;;

            --architecture-pattern )

                echo "${ARCHITECTURE}"

                shift 1

                break

                ;;

            --motif )

                echo "${LOCATION}" | egrep "${THEME_MOTIF}" | sed -r "s!.*${THEME_MOTIF}.*!\1!"

                shift 1

                break

                ;;

            --motif-name )

                echo "${LOCATION}" | egrep "${THEME_MOTIF}" | sed -r "s!.*${THEME_MOTIF}.*!\2!"

                shift 1

                break

                ;;

            --motif-version )

                echo "${LOCATION}" | egrep "${THEME_MOTIF}" | sed -r "s!.*${THEME_MOTIF}.*!\3!"

                shift 1

                break

                ;;

            --motif-pattern )

                echo "${THEME_MOTIF}"

                shift 1

                break

                ;;

            --repo-dir )

                echo "${LOCATION}" | sed "s,${TCAR_USER_WRKDIR}/,,"

                shift 1

                break

                ;;

        esac

    done

}