# Ceres Solver - A fast non-linear least squares minimizer

# Copyright 2015 Google Inc. All rights reserved.

# http://ceres-solver.org/

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# * Redistributions of source code must retain the above copyright notice,

#   this list of conditions and the following disclaimer.

# * Redistributions in binary form must reproduce the above copyright notice,

#   this list of conditions and the following disclaimer in the documentation

#   and/or other materials provided with the distribution.

# * Neither the name of Google Inc. nor the names of its contributors may be

#   used to endorse or promote products derived from this software without

#   specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# Author: alexs.mac@gmail.com (Alex Stewart)

#

# Extract Ceres version from <CERES_SOURCE_ROOT>/include/ceres/version.h

# so that we only have a single definition of the Ceres version, not two

# one in the source and one in the CMakeLists.txt.

macro(read_ceres_version_from_source CERES_SOURCE_ROOT)

  set(CERES_VERSION_FILE ${CERES_SOURCE_ROOT}/include/ceres/version.h)

  if (NOT EXISTS ${CERES_VERSION_FILE})

    message(FATAL_ERROR "Cannot find Ceres version.h file in specified "

      "Ceres source directory: ${CERES_SOURCE_ROOT}, it is not here: "

      "${CERES_VERSION_FILE}")

  endif()

  file(READ ${CERES_VERSION_FILE} CERES_VERSION_FILE_CONTENTS)

  string(REGEX MATCH "#define CERES_VERSION_MAJOR [0-9]+"

    CERES_VERSION_MAJOR "${CERES_VERSION_FILE_CONTENTS}")

  string(REGEX REPLACE "#define CERES_VERSION_MAJOR ([0-9]+)" "\\1"

    CERES_VERSION_MAJOR "${CERES_VERSION_MAJOR}")

  # NOTE: if (VAR) is FALSE if VAR is numeric and <= 0, as such we cannot use

  #       it for testing version numbers, which might well be zero, at least

  #       for the patch version, hence check for empty string explicitly.

  if ("${CERES_VERSION_MAJOR}" STREQUAL "")

    message(FATAL_ERROR "Failed to extract Ceres major version from "

      "${CERES_VERSION_FILE}")

  endif()

  string(REGEX MATCH "#define CERES_VERSION_MINOR [0-9]+"

    CERES_VERSION_MINOR "${CERES_VERSION_FILE_CONTENTS}")

  string(REGEX REPLACE "#define CERES_VERSION_MINOR ([0-9]+)" "\\1"

    CERES_VERSION_MINOR "${CERES_VERSION_MINOR}")

  if ("${CERES_VERSION_MINOR}" STREQUAL "")

    message(FATAL_ERROR "Failed to extract Ceres minor version from "

      "${CERES_VERSION_FILE}")

  endif()

  string(REGEX MATCH "#define CERES_VERSION_REVISION [0-9]+"

    CERES_VERSION_PATCH "${CERES_VERSION_FILE_CONTENTS}")

  string(REGEX REPLACE "#define CERES_VERSION_REVISION ([0-9]+)" "\\1"

    CERES_VERSION_PATCH "${CERES_VERSION_PATCH}")

  if ("${CERES_VERSION_PATCH}" STREQUAL "")

    message(FATAL_ERROR "Failed to extract Ceres patch version from "

      "${CERES_VERSION_FILE}")

  endif()

  # This is on a single line s/t CMake does not interpret it as a list of

  # elements and insert ';' separators which would result in 3.;2.;0 nonsense.

  set(CERES_VERSION "${CERES_VERSION_MAJOR}.${CERES_VERSION_MINOR}.${CERES_VERSION_PATCH}")

  message(STATUS "Detected Ceres version: ${CERES_VERSION} from "

    "${CERES_VERSION_FILE}")

endmacro()