Added install-html target

Closes nexusformat#393

Author: eugenwintersberger

README.rst

@@ -19,6 +19,7 @@ the build system
 Building the code on Linux
 ==========================
 
+
 Enabling a physical file formats
 --------------------------------
 

doc/doxygen/CMakeLists.txt

@@ -27,6 +27,8 @@
 if (DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
 
     SET(SOURCES Doxyfile_c Doxyfile_cpp Doxyfile_f90 Doxyfile_f77 preamble.h)
+    set_directory_properties(PROPERTIES 
+        ADDITIONAL_MAKE_CLEAN_FILES "html-c html-cpp html-f77 html-f90")
 
     foreach(F ${SOURCES})
         configure_file(${F} ${F} @ONLY)
@@ -39,7 +41,7 @@ if (DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
     )
     install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html-c
             DESTINATION ${CMAKE_INSTALL_DOCDIR}/api
-            COMPONENT Documentation)
+            COMPONENT html OPTIONAL)
 
     add_dependencies(html html_c_api_doc)
 
@@ -52,7 +54,7 @@ if (DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
 
         install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html-cpp
                 DESTINATION ${CMAKE_INSTALL_DOCDIR}/api
-                COMPONENT Documentation)
+                COMPONENT html OPTIONAL)
 
         add_dependencies(html html_cpp_api_doc)
     endif()
@@ -82,7 +84,7 @@ if (DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
 
         install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html-f90
                 DESTINATION ${CMAKE_INSTALL_DOCDIR}/api
-                COMPONENT Documentation)
+                COMPONENT html OPTIONAL)
 
         add_dependencies(html html_f90_api_doc)
     endif()
@@ -96,9 +98,15 @@ if (DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
 
         install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html-f77
                 DESTINATION ${CMAKE_INSTALL_DOCDIR}/api
-                COMPONENT Documentation)
+                COMPONENT html OPTIONAL)
         add_dependencies(html html_f77_api_doc)
     endif()
 
+    add_custom_target(install-html
+        ${CMAKE_COMMAND}
+        -D "CMAKE_INSTALL_COMPONENT=html"
+        -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_install.cmake")
+    add_dependencies(install-html html)
+
 endif (DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)