# serialplot 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 3 of the License, or

# (at your option) any later version.

#

# serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.

#

# try to get latest version from mercurial

find_program(HG hg)

if (HG)

  # get latest tag

  execute_process(COMMAND ${HG} parents --template {latesttag}

    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

    RESULT_VARIABLE HG_RESULT

    OUTPUT_VARIABLE HG_LATEST_TAG

    OUTPUT_STRIP_TRAILING_WHITESPACE)

    unset(HG_LATEST_TAG)

  # get revision

  execute_process(COMMAND ${HG} id -i

    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

    RESULT_VARIABLE HG_RESULT

    OUTPUT_VARIABLE HG_REVISION

    OUTPUT_STRIP_TRAILING_WHITESPACE)

  if(NOT HG_RESULT EQUAL 0)

    unset(HG_REVISION)

  endif(NOT HG_RESULT EQUAL 0)

endif (HG)

# Try to get version from .hg_archival file

if (NOT HG_LATEST_TAG)

  set(HG_ARCHIVAL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/.hg_archival.txt)

  if (EXISTS ${HG_ARCHIVAL_FILE})

    # get latest tag

    file(STRINGS ${HG_ARCHIVAL_FILE} HG_ARCHIVAL_LATEST_TAG REGEX "^latesttag:.+")

    string(REGEX REPLACE "latesttag:[ \t]*(.+)" "\\1" HG_LATEST_TAG ${HG_ARCHIVAL_LATEST_TAG})

    # get latest revision

    file(STRINGS ${HG_ARCHIVAL_FILE} HG_ARCHIVAL_REV REGEX "^node:.+")

    string(REGEX REPLACE "node:[ \t]*([a-fA-F0-9]+)" "\\1" HG_ARCHIVAL_REV ${HG_ARCHIVAL_REV})

    string(SUBSTRING ${HG_ARCHIVAL_REV} 0 12 HG_REVISION)

  endif()

endif ()

# extract version information from tag (remove 'v' prefix)

  string(REPLACE "v" "" HG_VERSION ${HG_LATEST_TAG})

  message("Version from mercurial: ${HG_VERSION} (${HG_REVISION})")

  # replace version string

  set(VERSION_STRING ${HG_VERSION})

  set(VERSION_REVISION ${HG_REVISION})

else ()

  message("Failed to find version information from mercurial.")

endif ()

# parse version numbers

string(REPLACE "." ";" VERSION_LIST ${VERSION_STRING})

list(GET VERSION_LIST 0 VERSION_MAJOR)

list(GET VERSION_LIST 1 VERSION_MINOR)

list(GET VERSION_LIST 2 VERSION_PATCH)