Require YCM and newer YARP, bump CMake to 3.5

* roboticslab-uc3m/questions-and-answers#55
* roboticslab-uc3m/questions-and-answers#65

CMakeLists.txt

@@ -1,28 +1,48 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
+# Define a project.
 project(ROBOTICSLAB_INSTALLATION_GUIDES LANGUAGES NONE)
 
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
+# Find dependencies
+find_package(YCM 0.8 REQUIRED)
 
-find_package(YARP REQUIRED)
-list(APPEND CMAKE_MODULE_PATH ${YARP_MODULE_PATH})
-include(YarpInstallationHelpers)
+# https://github.com/roboticslab-uc3m/questions-and-answers/issues/65
+find_package(YARP 3.0 QUIET)
+if(NOT YARP_FOUND)
+    find_package(YARP 2.3.70 REQUIRED)
+endif()
+
+# Set some useful variables - paths relative to the installation prefix.
 yarp_configure_external_installation(roboticslab-installation-guides)
 
+# Collect Markdown files. Globbing is evil, but we don't care. All we
+# need CMake here for is to support superbuild-like repos through YCM.
 file(GLOB md ${CMAKE_SOURCE_DIR}/*.md)
-yarp_install(FILES ${md} DESTINATION ${ROBOTICSLAB-INSTALLATION-GUIDES_CONTEXTS_INSTALL_DIR})
 
+# Install files, create a copy in the local build tree.
+yarp_install(FILES ${md}
+             DESTINATION ${ROBOTICSLAB-INSTALLATION-GUIDES_CONTEXTS_INSTALL_DIR})
+
+# Store this package in the user registry.
+export(PACKAGE ${PROJECT_NAME})
+
+# Define CMAKE_INSTALL_<dir> and CMAKE_INSTALL_FULL_<dir> variables.
 include(GNUInstallDirs)
 
+# Set installation path for CMake files.
 if(WIN32 AND NOT CYGWIN)
     set(_cmake_destination CMake)
 else()
-    set(_cmake_destination ${CMAKE_INSTALL_LIBDIR}/cmake/ROBOTICSLAB_INSTALLATION_GUIDES)
+    set(_cmake_destination ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 endif()
 
-export(PACKAGE ROBOTICSLAB_INSTALLATION_GUIDES)
+# Create dummy CMake configuration export file.
+file(WRITE ${CMAKE_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+     "# Dummy CMake configuration export file.")
 
-file(WRITE ${CMAKE_BINARY_DIR}/ROBOTICSLAB_INSTALLATION_GUIDESConfig.cmake "# Dummy CMake configuration export file.")
-install(FILES ${CMAKE_BINARY_DIR}/ROBOTICSLAB_INSTALLATION_GUIDESConfig.cmake DESTINATION ${_cmake_destination})
+# Install CMake configuration file.
+install(FILES ${CMAKE_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+        DESTINATION ${_cmake_destination})
 
+# Add uninstall rule.
 include(AddUninstallTarget)