#
# Usage: cmake -D "PROJECT_SOURCE_DIR:PATH=${PROJECT_SOURCE_DIR}"
#              -D "OUTPUT_FILE:PATH=${PROJECT_BINARY_DIR}/Examples.dox"
#              -P GenerateExamplesDox.cmake

# This cmake script gets a lists of examples for the project and
# generates a file suitable for doxygen. The file is a list of
# "\examples filename", where doxygen will search for fileanme in it's
# example path. Doxygen should then generate an examples page with the
# referenced files.

# glob the examples for each language
file(
  GLOB_RECURSE
  examples_list_fullpath
  FOLLOW_SYMLINKS
  "${PROJECT_SOURCE_DIR}/Examples/*.cxx"
  "${PROJECT_SOURCE_DIR}/Examples/*.py"
  "${PROJECT_SOURCE_DIR}/Examples/*.java")

file(
  GLOB_RECURSE
  sphinx_examples_list_fullpath
  "${PROJECT_SOURCE_DIR}/Modules/Remote/SphinxExamples/src/*.cxx"
  "${PROJECT_SOURCE_DIR}/Modules/Remote/SphinxExamples/src/*.py")

# Use relative paths
set(examples_list)
string(LENGTH "${PROJECT_SOURCE_DIR}/" root_length)
foreach(_example ${examples_list_fullpath})
  string(
    SUBSTRING ${_example}
              ${root_length}
              -1
              example_relative)
  list(APPEND examples_list ${example_relative})
endforeach()
string(LENGTH "${PROJECT_SOURCE_DIR}/Modules/Remote/" root_length)
foreach(_example ${sphinx_examples_list_fullpath})
  string(
    SUBSTRING ${_example}
              ${root_length}
              -1
              example_relative)
  list(APPEND examples_list ${example_relative})
endforeach()

# remove the file before we begin appending
file(REMOVE ${OUTPUT_FILE})

# begin comment
file(APPEND ${OUTPUT_FILE} "/**\n")

# After updating to Doxygen 1.8.4, this new line is required for any
# of the \example to be utilized
file(APPEND ${OUTPUT_FILE} " \n")

foreach(f IN LISTS examples_list)
  file(APPEND ${OUTPUT_FILE} "\\example ${f}\n")
endforeach()

# end comment
file(APPEND ${OUTPUT_FILE} "*/\n")