#!/bin/bash

#

# cli_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.

#

# 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 cli_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-release,motif-pattern'

    # Define release pattern.

    local RELEASE="(([[:digit:]]+)(\.([[:digit:]]+)){0,1})"

    # 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="Identity/Images/Themes/(([[:alnum:]]+)/(${RELEASE}))"

    # 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 ARGUMENTS=''

    # Prepare ARGUMENTS variable for getopt.

    cli_parseArgumentsReDef "$@"

    # Redefine ARGUMENTS using getopt(1) command parser.

    cli_parseArguments

    # Redefine positional parameters using ARGUMENTS variable.

    eval set -- "$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 "$LOCATION" | egrep "${RELEASE}" | sed -r "s!.*/${RELEASE}/.*!\1!"

                shift 1

                break

                ;;

            --release-major )

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

                shift 1

                break

                ;;

            --release-minor )

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

                shift 1

                break

                ;;

            --release-pattern )

                echo "${RELEASE}"

                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-release )

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

                shift 1

                break

                ;;

            --motif-pattern )

                echo "${THEME_MOTIF}"

                shift 1

                break

                ;;

        esac

    done

}