#
# Included from a dashboard script, this cmake file will drive the configure and build
# steps of Slicer extensions.
#

#
# SCRIPT_MODE:
#
#   Experimental:
#     - run_ctest() macro will be called *ONE* time
#     - binary directory will *NOT* be cleaned
#   Continuous:
#     - run_ctest() macro will be called EVERY 5 minutes ...
#     - binary directory will *NOT* be cleaned
#     - configure/build will be executed *ONLY* if the repository has been updated
#   Nightly:
#     - run_ctest() macro will be called *ONE* time
#     - binary directory *WILL BE* cleaned
#

# Helper function used to generate the CMake script that will perform the initial clone
# of a git repository. (Copied from ExternalProject CMake module)
function(_write_gitclone_script script_filename source_dir git_EXECUTABLE git_repository git_tag src_name work_dir)
  file(WRITE ${script_filename}
"if(\"${git_tag}\" STREQUAL \"\")
  message(FATAL_ERROR \"Tag for git checkout should not be empty.\")
endif()

execute_process(
  COMMAND \${CMAKE_COMMAND} -E remove_directory \"${source_dir}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to remove directory: '${source_dir}'\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" clone \"${git_repository}\" \"${src_name}\"
  WORKING_DIRECTORY \"${work_dir}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to clone repository: '${git_repository}'\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" checkout ${git_tag}
  WORKING_DIRECTORY \"${work_dir}/${src_name}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to checkout tag: '${git_tag}'\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" submodule init
  WORKING_DIRECTORY \"${work_dir}/${src_name}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to init submodules in: '${work_dir}/${src_name}'\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" submodule update --recursive
  WORKING_DIRECTORY \"${work_dir}/${src_name}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to update submodules in: '${work_dir}/${src_name}'\")
endif()

"
)
endfunction()

# Helper function used to generate the CMake script that will update a git clone given a tag.
# (Inspired from ExternalProject CMake module)
function(_update_gitclone_script script_filename source_dir git_EXECUTABLE git_repository git_tag src_name work_dir)
  file(WRITE ${script_filename}
"if(\"${git_tag}\" STREQUAL \"\")
  message(FATAL_ERROR \"Tag for git checkout should not be empty.\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" fetch
  WORKING_DIRECTORY \"${work_dir}/${src_name}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to fetch repository: '${git_repository}'\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" checkout ${git_tag}
  WORKING_DIRECTORY \"${work_dir}/${src_name}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to checkout tag: '${git_tag}'\")
endif()

execute_process(
  COMMAND \"${git_EXECUTABLE}\" submodule update --recursive
  WORKING_DIRECTORY \"${work_dir}/${src_name}\"
  RESULT_VARIABLE error_code
  )
if(error_code)
  message(FATAL_ERROR \"Failed to update submodules in: '${work_dir}/${src_name}'\")
endif()

"
)
endfunction()

# Helper function used to extract slicer revision within a header file. The revision is
# expected to be defined using the format '#define Slicer_WC_REVISION "abcd123456"'
function(_get_slicer_revision headerfile varname)
  set(_macroname Slicer_WC_REVISION)
  set(_revision_regex "^#define[ \t]+${_macroname}[ \t]+[\"]*([0-9A-Za-z\\.]+)[\"][ \t]*$")
  file(STRINGS "${headerfile}" _revision_string
       LIMIT_COUNT 1 REGEX ${_revision_regex})
  set(dollar "$")
  string(REGEX REPLACE ${_revision_regex} "\\1" _revision "${_revision_string}")

  set(${varname} ${_revision} PARENT_SCOPE)
endfunction()


# Macro allowing to set a variable to its default value if not already defined.
# The default value is set with:
#  (1) if set, the value environment variable <var>.
#  (2) if set, the value of local variable variable <var>.
#  (3) if none of the above, the value passed as a parameter.
# Setting the optional parameter 'OBFUSCATE' will display 'OBFUSCATED' instead of the real value.
macro(setIfNotDefined var defaultvalue)
  set(_obfuscate FALSE)
  foreach(arg ${ARGN})
    if(arg STREQUAL "OBFUSCATE")
      set(_obfuscate TRUE)
    endif()
  endforeach()
  if(DEFINED ENV{${var}} AND NOT DEFINED ${var})
    set(_value "$ENV{${var}}")
    if(_obfuscate)
      set(_value "OBFUSCATED")
    endif()
    message(STATUS "Setting '${var}' variable with environment variable value '${_value}'")
    set(${var} $ENV{${var}})
  endif()
  if(NOT DEFINED ${var})
    set(_value "${defaultvalue}")
    if(_obfuscate)
      set(_value "OBFUSCATED")
    endif()
    message(STATUS "Setting '${var}' variable with default value '${_value}'")
    set(${var} "${defaultvalue}")
  endif()
  if(NOT _obfuscate)
    list(APPEND variables ${var})
  endif()
endmacro()


# The following variables are expected to be defined in the top-level script:
set(expected_variables
  SCRIPT_MODE
  CTEST_BUILD_CONFIGURATION
  ADDITIONAL_CMAKECACHE_OPTION
  CTEST_CMAKE_GENERATOR
  CTEST_BUILD_FLAGS
  EXTENSIONS_TRACK_QUALIFIER
  EXTENSIONS_BUILDSYSTEM_TESTING
  EXTENSIONS_INDEX_GIT_REPOSITORY
  EXTENSIONS_INDEX_GIT_TAG
  Slicer_DIR
  )

#-----------------------------------------------------------------------------
# Defaults
#-----------------------------------------------------------------------------
if(DEFINED Slicer_RELEASE_TYPE)
  if("${Slicer_RELEASE_TYPE}" MATCHES "^E.*")
    set(Slicer_RELEASE_TYPE "Experimental")
  elseif("${Slicer_RELEASE_TYPE}" MATCHES "^P.*")
    set(Slicer_RELEASE_TYPE "Preview")
  elseif("${Slicer_RELEASE_TYPE}" MATCHES "^S.*")
    set(Slicer_RELEASE_TYPE "Stable")
  else()
    message(FATAL_ERROR "Invalid value for Slicer_RELEASE_TYPE [${Slicer_RELEASE_TYPE}]")
  endif()
else()
  set(Slicer_RELEASE_TYPE "Experimental")
endif()

if(NOT DEFINED BITNESS)
  set(BITNESS "64")
endif()
list(APPEND expected_variables BITNESS)

#-----------------------------------------------------------------------------
# Set CTEST_BUILD_NAME
#-----------------------------------------------------------------------------
if(NOT DEFINED CTEST_BUILD_NAME)
  list(APPEND expected_variables
    OPERATING_SYSTEM
    COMPILER
    QT_VERSION
    BUILD_NAME_SUFFIX
    )
  set(name "${OPERATING_SYSTEM}-${COMPILER}-${BITNESS}bits-QT${QT_VERSION}")
  if(NOT "${BUILD_NAME_SUFFIX}" STREQUAL "")
    set(name "${name}-${BUILD_NAME_SUFFIX}")
  endif()
  set(CTEST_BUILD_NAME "${name}-${CTEST_BUILD_CONFIGURATION}")
endif()
list(APPEND expected_variables CTEST_BUILD_NAME)

#-----------------------------------------------------------------------------
# Set CTEST_SITE
#-----------------------------------------------------------------------------
if(NOT DEFINED CTEST_SITE)
  list(APPEND expected_variables
    HOSTNAME
    ORGANIZATION
    )
  string(TOLOWER ${ORGANIZATION} ORGANIZATION_LC)
  set(CTEST_SITE "${HOSTNAME}.${ORGANIZATION_LC}")
endif()
list(APPEND expected_variables CTEST_SITE)

#-----------------------------------------------------------------------------
# Build directory
#-----------------------------------------------------------------------------
set(testing_suffix "")
set(testing_long_suffix "")
if(EXTENSIONS_BUILDSYSTEM_TESTING)
  set(testing_suffix "-T")
  set(testing_long_suffix "-Testing")
endif()
if(NOT DEFINED CTEST_BINARY_DIRECTORY)
  list(APPEND expected_variables
    DASHBOARDS_DIR
    EXTENSION_DASHBOARD_SUBDIR
    EXTENSION_DIRECTORY_BASENAME
    Slicer_DIRECTORY_IDENTIFIER
    )
  set(CTEST_BINARY_DIRECTORY "${DASHBOARDS_DIR}/${EXTENSION_DASHBOARD_SUBDIR}/${EXTENSION_DIRECTORY_BASENAME}-${Slicer_DIRECTORY_IDENTIFIER}-E${testing_suffix}-b")
endif()
list(APPEND expected_variables CTEST_BINARY_DIRECTORY)

file(WRITE "${CTEST_BINARY_DIRECTORY} - SlicerExtensions-build-${CTEST_BUILD_NAME}-${SCRIPT_MODE}${testing_long_suffix}-${EXTENSIONS_INDEX_BRANCH}.txt" "Generated by ${CTEST_SCRIPT_NAME}")

#-----------------------------------------------------------------------------
# Source directory
#-----------------------------------------------------------------------------
if(NOT DEFINED EXTENSIONS_BUILDSYSTEM_SOURCE_DIRECTORY)
  list(APPEND expected_variables
    Slicer_SOURCE_DIR
    )
  set(EXTENSIONS_BUILDSYSTEM_SOURCE_DIRECTORY "${Slicer_SOURCE_DIR}/Extensions/CMake")
endif()
list(APPEND expected_variables EXTENSIONS_BUILDSYSTEM_SOURCE_DIRECTORY)

if(NOT DEFINED CTEST_SOURCE_DIRECTORY)
  set(CTEST_SOURCE_DIRECTORY ${EXTENSIONS_BUILDSYSTEM_SOURCE_DIRECTORY})
endif()
if(NOT EXISTS "${CTEST_SOURCE_DIRECTORY}")
  message(FATAL_ERROR "Aborting build. CTEST_SOURCE_DIRECTORY is set to a non-existent directory [${CTEST_SOURCE_DIRECTORY}]")
endif()
list(APPEND expected_variables CTEST_SOURCE_DIRECTORY)

#-----------------------------------------------------------------------------
# Sanity check
#-----------------------------------------------------------------------------
foreach(var ${expected_variables})
  if(NOT DEFINED ${var})
    message(FATAL_ERROR "Variable ${var} should be defined in top-level script !")
  endif()
endforeach()

# Collect variables to display
set(variables ${expected_variables})

#-----------------------------------------------------------------------------
if(NOT DEFINED CTEST_CONFIGURATION_TYPE AND DEFINED CTEST_BUILD_CONFIGURATION)
  set(CTEST_CONFIGURATION_TYPE ${CTEST_BUILD_CONFIGURATION})
endif()
list(APPEND variables CTEST_CONFIGURATION_TYPE)

#-----------------------------------------------------------------------------
# Append top-level script as a CDash note
list(APPEND CTEST_NOTES_FILES "${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}")

#-----------------------------------------------------------------------------
# Set default values
#-----------------------------------------------------------------------------
setIfNotDefined(CTEST_TEST_TIMEOUT 900) # 15mins
setIfNotDefined(CTEST_PARALLEL_LEVEL 8)
setIfNotDefined(MIDAS_PACKAGE_URL "http://slicer.kitware.com/midas3")
setIfNotDefined(MIDAS_PACKAGE_EMAIL "MIDAS_PACKAGE_EMAIL-NOTDEFINED" OBFUSCATE)
setIfNotDefined(MIDAS_PACKAGE_API_KEY "MIDAS_PACKAGE_API_KEY-NOTDEFINED" OBFUSCATE)
setIfNotDefined(CTEST_DROP_SITE "slicer.cdash.org")

#-----------------------------------------------------------------------------
# The following variable can be used to disable specific steps
#-----------------------------------------------------------------------------

# Variables influencing the top-level CMake project
setIfNotDefined(run_ctest_submit TRUE)
setIfNotDefined(run_ctest_with_disable_clean FALSE)
setIfNotDefined(run_ctest_with_update TRUE)
setIfNotDefined(run_ctest_with_configure TRUE)
setIfNotDefined(run_ctest_with_build TRUE)
setIfNotDefined(run_ctest_with_notes TRUE)
setIfNotDefined(Slicer_UPLOAD_EXTENSIONS TRUE)

# Variables influencing each extension CMake project
setIfNotDefined(run_extension_ctest_submit ${run_ctest_submit})
setIfNotDefined(run_extension_ctest_with_configure TRUE)
setIfNotDefined(run_extension_ctest_with_build TRUE)
setIfNotDefined(run_extension_ctest_with_test TRUE)
setIfNotDefined(run_extension_ctest_with_packages TRUE)

#-----------------------------------------------------------------------------
# CDash Project Name
#-----------------------------------------------------------------------------
if(NOT DEFINED CDASH_PROJECT_NAME)
  set(CDASH_PROJECT_NAME  "SlicerPreview")
  if("${Slicer_RELEASE_TYPE}" STREQUAL "Stable")
    # XXX Rename Slicer CDash project
    set(CDASH_PROJECT_NAME "Slicer4")
    #set(CDASH_PROJECT_NAME  "SlicerStable")
  endif()
endif()
list(APPEND variables CDASH_PROJECT_NAME)

#-----------------------------------------------------------------------------
# Required executables
#-----------------------------------------------------------------------------
if(NOT DEFINED CTEST_GIT_COMMAND)
  find_program(CTEST_GIT_COMMAND NAMES git)
endif()
if(NOT EXISTS "${CTEST_GIT_COMMAND}")
  message(FATAL_ERROR "CTEST_GIT_COMMAND is set to a non-existent path [${CTEST_GIT_COMMAND}]")
endif()
message(STATUS "CTEST_GIT_COMMAND: ${CTEST_GIT_COMMAND}")

if(NOT DEFINED CTEST_SVN_COMMAND)
  find_program(CTEST_SVN_COMMAND NAMES svn)
endif()
if(NOT EXISTS "${CTEST_SVN_COMMAND}")
  message(FATAL_ERROR "CTEST_SVN_COMMAND is set to a non-existent path [${CTEST_SVN_COMMAND}]")
endif()
message(STATUS "CTEST_SVN_COMMAND: ${CTEST_SVN_COMMAND}")

#-----------------------------------------------------------------------------
set(CTEST_COMMAND ${CMAKE_CTEST_COMMAND})

if(NOT EXTENSIONS_BUILDSYSTEM_TESTING)
  set(Slicer_EXTENSION_DESCRIPTION_DIR "${CTEST_BINARY_DIRECTORY}/ExtensionsIndex")
endif()
list(APPEND variables Slicer_EXTENSION_DESCRIPTION_DIR)

# Since having '/' in the build name confuses CDash (Separate entries are added for both
# update and rest of the build), let's convert them into '-'.
string(REGEX REPLACE "[/]" "-" CTEST_BUILD_NAME ${CTEST_BUILD_NAME})

# Should binary directory be cleaned?
set(empty_binary_directory FALSE)

# Attempt to build and test also if 'ctest_update' returned an error
set(force_build FALSE)

# Ensure SCRIPT_MODE is lowercase
string(TOLOWER ${SCRIPT_MODE} SCRIPT_MODE)

# Set model and track options
set(model "")
if(SCRIPT_MODE STREQUAL "experimental")
  set(empty_binary_directory FALSE)
  set(force_build TRUE)
  set(model Experimental)
elseif(SCRIPT_MODE STREQUAL "continuous")
  set(empty_binary_directory TRUE)
  set(force_build FALSE)
  set(model Continuous)
elseif(SCRIPT_MODE STREQUAL "nightly")
  set(empty_binary_directory TRUE)
  set(force_build TRUE)
  set(model Nightly)
else()
  message(FATAL_ERROR "Unknown script mode: '${SCRIPT_MODE}'. Script mode should be either 'experimental', 'continuous' or 'nightly'")
endif()
set(track_qualifier_cleaned "${EXTENSIONS_TRACK_QUALIFIER}-")
# Track associated with 'master' should default to either 'Continuous', 'Nightly' or 'Experimental'
if(track_qualifier_cleaned STREQUAL "master-")
  set(track_qualifier_cleaned "")
endif()
set(track Extensions-${track_qualifier_cleaned}${model})
set(track ${CTEST_TRACK_PREFIX}${track}${CTEST_TRACK_SUFFIX})

# Used in SlicerExtensionPackageAndUploadTarget CMake module
set(ENV{CTEST_MODEL} ${model})

# For more details, see https://cmake.org/cmake/help/latest/module/CTestUseLaunchers.html
set(CTEST_USE_LAUNCHERS 1)
if(NOT "${CTEST_CMAKE_GENERATOR}" MATCHES "Make|Ninja")
  set(CTEST_USE_LAUNCHERS 0)
endif()
set(ENV{CTEST_USE_LAUNCHERS_DEFAULT} ${CTEST_USE_LAUNCHERS})

list(APPEND variables empty_binary_directory)
list(APPEND variables force_build)
list(APPEND variables model)
list(APPEND variables track)
list(APPEND variables CTEST_USE_LAUNCHERS)

if(empty_binary_directory AND NOT run_ctest_with_disable_clean)
  set(msg "Removing binary directory [${CTEST_BINARY_DIRECTORY}]")
  message(STATUS "${msg}")
  ctest_empty_binary_directory(${CTEST_BINARY_DIRECTORY})
  message(STATUS "${msg} - done")
endif()

# Given a variable name, this function will display the text
#   "-- <varname> ................: ${<varname>}"
# and will ensure that the message is consistently padded.
#
# If the variable is not defined, it will display:
#   "-- <varname> ................: <NOT DEFINED>"
function(display_var varname)
  set(pretext_right_jusitfy_length 35)
  set(fill_char ".")

  set(value ${${varname}})
  if(NOT DEFINED ${varname})
    set(value "NOT DEFINED")
  endif()

  set(pretext "${varname}")
  string(LENGTH ${pretext} pretext_length)
  math(EXPR pad_length "${pretext_right_jusitfy_length} - ${pretext_length} - 1")
  if(pad_length GREATER 0)
    string(RANDOM LENGTH ${pad_length} ALPHABET ${fill_char} pretext_dots)
    set(text "${pretext} ${pretext_dots}: ${value}")
  elseif(pad_length EQUAL 0)
    set(text "${pretext} : ${value}")
  else()
    set(text "${pretext}: ${value}")
  endif()
  message(STATUS "${text}")
endfunction()

# Display variables
foreach(var ${variables})
  display_var(${var})
endforeach()

#-----------------------------------------------------------------------------
# Environment
#-----------------------------------------------------------------------------

# This will ensure compiler paths specified using the cache variables are used
# consistently.
if(DEFINED CMAKE_C_COMPILER)
  set(ENV{CC} "/dev/null")
endif()
if(DEFINED CMAKE_CXX_COMPILER)
  set(ENV{CXX} "/dev/null")
endif()

if(UNIX)
  if("$ENV{DISPLAY}" STREQUAL "")
    set(ENV{DISPLAY} ":0")
  endif()
  message(STATUS "Setting ENV{DISPLAY} to $ENV{DISPLAY}")
endif()

# Cache for External data downloads
if("$ENV{ExternalData_OBJECT_STORES}" STREQUAL "")
  set(ENV{ExternalData_OBJECT_STORES} "$ENV{HOME}/.ExternalData")
endif()
message(STATUS "Setting ENV{ExternalData_OBJECT_STORES} to $ENV{ExternalData_OBJECT_STORES}")

#-----------------------------------------------------------------------------
# Source code checkout and update commands
#-----------------------------------------------------------------------------

if(NOT EXTENSIONS_BUILDSYSTEM_TESTING)
  # Compute 'work_dir' and 'src_name' variable used by both _write_gitclone_script and _update_gitclone_script
  get_filename_component(src_dir ${Slicer_EXTENSION_DESCRIPTION_DIR} REALPATH)
  get_filename_component(work_dir ${src_dir} PATH)
  get_filename_component(src_name ${src_dir} NAME)

  string(REGEX REPLACE "[/]" "-" git_tag_cleaned ${EXTENSIONS_INDEX_GIT_TAG})

  if(NOT EXISTS "${Slicer_EXTENSION_DESCRIPTION_DIR}/.git")
    _write_gitclone_script(
      ${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}-${git_tag_cleaned}-${SCRIPT_MODE}-gitclone.cmake # script_filename
      ${Slicer_EXTENSION_DESCRIPTION_DIR} # source_dir
      ${CTEST_GIT_COMMAND} # git_EXECUTABLE
      ${EXTENSIONS_INDEX_GIT_REPOSITORY} # git_repository
      ${EXTENSIONS_INDEX_GIT_TAG} # git_tag
      ${src_name} # src_name
      ${work_dir} # work_dir
    )
    # Note: The following command should be specified as a string.
    string(REPLACE " " "\\ " CMAKE_COMMAND_ESCAPED ${CMAKE_COMMAND})
    set(CTEST_CHECKOUT_COMMAND "${CMAKE_COMMAND_ESCAPED} -P ${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}-${git_tag_cleaned}-${SCRIPT_MODE}-gitclone.cmake")
  endif()

  _update_gitclone_script(
    ${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}-${git_tag_cleaned}-${SCRIPT_MODE}-gitupdate.cmake # script_filename
    ${Slicer_EXTENSION_DESCRIPTION_DIR} # source_dir
    ${CTEST_GIT_COMMAND} # git_EXECUTABLE
    ${EXTENSIONS_INDEX_GIT_REPOSITORY} # git_repository
    ${EXTENSIONS_INDEX_GIT_TAG} # git_tag
    ${src_name} # src_name
    ${work_dir} # work_dir
    )

  # Note: The following command should be specified as a list.
  set(CTEST_GIT_UPDATE_CUSTOM ${CMAKE_COMMAND} -P ${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}-${git_tag_cleaned}-${SCRIPT_MODE}-gitupdate.cmake)

  # Retrieve revision associated with Slicer build tree
  set(slicer_version_header "${Slicer_DIR}/vtkSlicerVersionConfigure.h")
  if(NOT EXISTS "${slicer_version_header}")
    message(FATAL_ERROR "Aborting build. Could not find 'vtkSlicerVersionConfigure.h' in Slicer_DIR [${Slicer_DIR}].")
  endif()
  _get_slicer_revision("${slicer_version_header}" Slicer_WC_REVISION)
  message(STATUS "Slicer_WC_REVISION:${Slicer_WC_REVISION}")
  set(Slicer_PREVIOUS_WC_REVISION ${Slicer_WC_REVISION})

endif()

#-----------------------------------------------------------------------------
# run_ctest macro
#-----------------------------------------------------------------------------
macro(run_ctest)

  set(slicer_build_in_progress FALSE)
  set(build_in_progress_file ${Slicer_DIR}/BUILD_IN_PROGRESS)
  if(EXISTS ${build_in_progress_file})
    set(slicer_build_in_progress TRUE)
  endif()

  if(slicer_build_in_progress)
    message("Skipping run_ctest() - Slicer build in PROGRESS")
  else()

    message(STATUS "Configuring ${CTEST_BINARY_DIRECTORY}/CTestConfig.cmake")
    # Require CTEST_DROP_SITE and CDASH_PROJECT_NAME
    configure_file(
      ${CTEST_SOURCE_DIRECTORY}/CTestConfig.cmake.in
      ${CTEST_BINARY_DIRECTORY}/CTestConfig.cmake
      )

    ctest_start(${model} TRACK ${track})

    if(NOT EXTENSIONS_BUILDSYSTEM_TESTING AND run_ctest_with_update)
      ctest_update(SOURCE "${Slicer_EXTENSION_DESCRIPTION_DIR}" RETURN_VALUE FILES_UPDATED)
    endif()
    set(CTEST_CHECKOUT_COMMAND) # checkout on first iteration only

    # force a build if this is the first run and the build dir is empty
    if(NOT EXISTS "${CTEST_BINARY_DIRECTORY}/CMakeCache.txt")
      message(STATUS "First time build - Initialize CMakeCache.txt")
      set(force_build TRUE)

      set(OPTIONAL_CACHE_CONTENT)

      if(NOT EXTENSIONS_BUILDSYSTEM_TESTING)
        set(OPTIONAL_CACHE_CONTENT "${OPTIONAL_CACHE_CONTENT}
Slicer_EXTENSION_DESCRIPTION_DIR:PATH=${Slicer_EXTENSION_DESCRIPTION_DIR}")
      endif()

      if(DEFINED CMAKE_C_COMPILER)
        set(OPTIONAL_CACHE_CONTENT "${OPTIONAL_CACHE_CONTENT}
CMAKE_C_COMPILER:FILEPATH=${CMAKE_C_COMPILER}")
      endif()

      if(DEFINED CMAKE_CXX_COMPILER)
        set(OPTIONAL_CACHE_CONTENT "${OPTIONAL_CACHE_CONTENT}
CMAKE_CXX_COMPILER:FILEPATH=${CMAKE_CXX_COMPILER}")
      endif()

      if(DEFINED CMAKE_OSX_DEPLOYMENT_TARGET)
        set(OPTIONAL_CACHE_CONTENT "${OPTIONAL_CACHE_CONTENT}
CMAKE_OSX_DEPLOYMENT_TARGET:STRING=${CMAKE_OSX_DEPLOYMENT_TARGET}")
      endif()

      if(DEFINED CTEST_SVN_COMMAND)
        set(OPTIONAL_CACHE_CONTENT "${OPTIONAL_CACHE_CONTENT}
Subversion_SVN_EXECUTABLE:FILEPATH=${CTEST_SVN_COMMAND}")
      endif()

      #-----------------------------------------------------------------------------
      # Write initial cache.
      #-----------------------------------------------------------------------------
      file(WRITE "${CTEST_BINARY_DIRECTORY}/CMakeCache.txt" "
CDASH_PROJECT_NAME:STRING=${CDASH_PROJECT_NAME}
CTEST_MODEL:STRING=${model}
CTEST_SITE:STRING=${CTEST_SITE}
Slicer_EXTENSIONS_TRACK_QUALIFIER:STRING=${EXTENSIONS_TRACK_QUALIFIER}
GIT_EXECUTABLE:FILEPATH=${CTEST_GIT_COMMAND}
MIDAS_PACKAGE_URL:STRING=${MIDAS_PACKAGE_URL}
MIDAS_PACKAGE_EMAIL:STRING=${MIDAS_PACKAGE_EMAIL}
MIDAS_PACKAGE_API_KEY:STRING=${MIDAS_PACKAGE_API_KEY}
Slicer_DIR:PATH=${Slicer_DIR}
Slicer_UPLOAD_EXTENSIONS:BOOL=${Slicer_UPLOAD_EXTENSIONS}
${OPTIONAL_CACHE_CONTENT}
${ADDITIONAL_CMAKECACHE_OPTION}
")
    endif()

    _get_slicer_revision("${Slicer_DIR}/vtkSlicerVersionConfigure.h" Slicer_WC_REVISION)
    set(slicer_source_updated FALSE)
    if(NOT "${Slicer_PREVIOUS_WC_REVISION}" STREQUAL "${Slicer_WC_REVISION}")
      set(slicer_source_updated TRUE)
    endif()

    message(STATUS "FILES_UPDATED ................: ${FILES_UPDATED}")
    message(STATUS "force_build ..................: ${force_build}")
    message(STATUS "Slicer_PREVIOUS_WC_REVISION ..: ${Slicer_PREVIOUS_WC_REVISION}")
    message(STATUS "Slicer_WC_REVISION ...........: ${Slicer_WC_REVISION}")

    if(FILES_UPDATED GREATER 0 OR force_build OR slicer_source_updated)

      set(Slicer_PREVIOUS_WC_REVISION ${Slicer_WC_REVISION})
      set(force_build FALSE)

      #-----------------------------------------------------------------------------
      # Update
      #-----------------------------------------------------------------------------
      if(run_ctest_with_update AND run_ctest_submit)
        ctest_submit(PARTS Update)
      endif()

      #-----------------------------------------------------------------------------
      # Configure
      #-----------------------------------------------------------------------------
      if(run_ctest_with_configure)
        set_property(GLOBAL PROPERTY Label ${label})
        ctest_configure(BUILD "${CTEST_BINARY_DIRECTORY}")
        ctest_read_custom_files("${CTEST_BINARY_DIRECTORY}")
        if(run_ctest_submit)
          ctest_submit(PARTS Configure)
        endif()
      endif()

      #-----------------------------------------------------------------------------
      # Build
      #-----------------------------------------------------------------------------
      set(build_errors)
      if(run_ctest_with_build)
        ctest_build(BUILD "${CTEST_BINARY_DIRECTORY}" NUMBER_ERRORS build_errors APPEND)
        if(run_ctest_submit)
          ctest_submit(PARTS Build)
        endif()
      endif()

      #-----------------------------------------------------------------------------
      # Note should be at the end
      #-----------------------------------------------------------------------------
      if(run_ctest_with_notes AND run_ctest_submit)
        ctest_submit(PARTS Notes)
      endif()

    endif()
  endif()
endmacro()

#-----------------------------------------------------------------------------
# Dashboard execution
#-----------------------------------------------------------------------------

if(SCRIPT_MODE STREQUAL "continuous")
  while(${CTEST_ELAPSED_TIME} LESS 46800) # Lasts 13 hours (Assuming it starts at 9am, it will end around 10pm)
    set(START_TIME ${CTEST_ELAPSED_TIME})
    run_ctest()
    set(interval 300)
    # Loop no faster than once every <interval> seconds
    message("Wait for ${interval} seconds ...")
    ctest_sleep(${START_TIME} ${interval} ${CTEST_ELAPSED_TIME})
  endwhile()
else()
  run_ctest()
endif()