################################################################################
##
## Copyright (c) 2007-2009 Illumina, Inc.
##
## This software is covered by the "Illumina Genome Analyzer Software
## License Agreement" and the "Illumina Source Code License Agreement",
## and certain third party copyright/licenses, and any user of this
## source file is bound by the terms therein (see accompanying files
## Illumina_Genome_Analyzer_Software_License_Agreement.pdf and
## Illumina_Source_Code_License_Agreement.pdf and third party
## copyright/license notices).
##
## This file is part of the Consensus Assessment of Sequence And VAriation 
## (CASAVA) software package.
##
## file unpackMultifileTarGz.cmake
##
## extracts the set of files matching the *.tar.gz.* pattern assuming they
## concatenate into a valid tar.gz file if ordered lexicographically
## arguments:
##  SOURCE_ARCHIVE_FOLDER - Location of *.tar.gz.* files
##  TARGET_FOLDER         - Destination folder. Tar will -C ${TARGET_FOLDER}
##  TAR_EXCLUDE_PATTERN   - will add --exclude ${TAR_EXCLUDE_PATTERN} to the 
##                          tar cmd line if not empty
##
## author Roman Petrovski
##
################################################################################

file(GLOB ARCHIVE_VOLUMES ${SOURCE_ARCHIVE_FOLDER}/*.tar.gz.*)

IF(NOT EXISTS ${TARGET_FOLDER}/.unpacked)

    IF(NOT "${TAR_EXCLUDE_PATTERN}" STREQUAL "")
        set(TAR_ARGS --exclude "${TAR_EXCLUDE_PATTERN}")
    ENDIF(NOT "${TAR_EXCLUDE_PATTERN}" STREQUAL "")

    execute_process(COMMAND mkdir -p ${TARGET_FOLDER})
    execute_process(COMMAND echo "${ARCHIVE_VOLUMES}"
                    COMMAND sed "s/;/\\n/g"
                    COMMAND sort
                    COMMAND xargs -L 1 cat
                    COMMAND tar -xzv ${TAR_ARGS} -C ${TARGET_FOLDER}
                    RESULT_VARIABLE UNPACK_RESULT
                   )
    IF(NOT ${UNPACK_RESULT})
        execute_process(COMMAND touch ${TARGET_FOLDER}/.unpacked)
    ENDIF(NOT ${UNPACK_RESULT})
ENDIF(NOT EXISTS ${TARGET_FOLDER}/.unpacked)