Merge lp:~unity-api-team/cmake-extras/fixes-for-michi into lp:cmake-extras

[Pete Woods]

Don't assume anything about the doxygen examples directory.
Only build docs when input files have changed.

Don't assume anything about the doxygen examples directory.
Only build docs when input files have changed.

[lp:~unity-api-team/cmake-extras/fixes-for-michi]

33. By Pete Woods on 2015-10-21

Update changelog

=== modified file 'debian/changelog'
--- debian/changelog	2015-10-20 13:13:45 +0000
+++ debian/changelog	2015-10-21 10:56:31 +0000
@@ -1,3 +1,10 @@
+cmake-extras (0.5-0ubuntu1) UNRELEASED; urgency=medium
+
+  * Don't assume anything about the doxygen examples directory. (LP: #1476487)
+  * Only build docs when input files have changed. (LP: #1476488)
+
+ -- Pete Woods <[e-mail]>  Wed, 21 Oct 2015 11:54:21 +0100
+
 cmake-extras (0.4+15.10.20151020-0ubuntu1) wily; urgency=medium
 
   [ Michi Henning ]

=== modified file 'src/UseDoxygen.cmake'
--- src/UseDoxygen.cmake	2015-06-19 09:04:54 +0000
+++ src/UseDoxygen.cmake	2015-10-21 10:56:31 +0000
@@ -77,10 +77,11 @@
 
   cmake_parse_arguments(_ARG "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
 
-  set(DOXYFILE_INPUT "\"${CMAKE_CURRENT_SOURCE_DIR}\"")
+  set(INPUT "\"${CMAKE_CURRENT_SOURCE_DIR}\"")
   if(_ARG_INPUT)
-    _doxygen_to_quoted_string(DOXYFILE_INPUT "${_ARG_INPUT}")
+    set(INPUT "${_ARG_INPUT}")
   endif()
+  _doxygen_to_quoted_string(DOXYFILE_INPUT "${INPUT}")
 
   set(DOXYFILE_FILE_PATTERNS "")
   if(_ARG_FILE_PATTERNS)
@@ -122,7 +123,7 @@
     set(DOXYFILE_XML_OUTPUT "${_ARG_XML_OUTPUT}")
   endif()
 
-  set(DOXYFILE_EXAMPLE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/examples")
+  set(DOXYFILE_EXAMPLE_PATH "")
   if(_ARG_EXAMPLE_PATH)
     set(DOXYFILE_EXAMPLE_PATH "${_ARG_EXAMPLE_PATH}")
   endif()
@@ -249,20 +250,39 @@
 
   configure_file("${_DOXYFILE_IN}" "${_DOXYFILE}" @ONLY)
 
-  add_custom_target(
-    ${TARGET_NAME}
-    ${_ALL}
+  set(OUTPUT_FILE "${DOXYFILE_OUTPUT_DIRECTORY}/${DOXYFILE_HTML_OUTPUT}/index.html")
+
+  set(DEPENDENCIES "")
+  foreach(_DIRECTORY ${INPUT})
+    file(
+      GLOB_RECURSE _TMP
+      "${_DIRECTORY}/*"
+    )
+    list(APPEND DEPENDENCIES ${_TMP})
+  endforeach()
+
+  add_custom_command(
+    OUTPUT
+      "${OUTPUT_FILE}"
     COMMAND
       "${DOXYGEN_EXECUTABLE}"
       "${_DOXYFILE}" 
     DEPENDS
       "${_DOXYFILE}"
+      ${DEPENDENCIES}
     COMMENT
       "Writing documentation to ${DOXYFILE_OUTPUT_DIRECTORY}..."
     WORKING_DIRECTORY
       "${CMAKE_CURRENT_SOURCE_DIR}"
   )
 
+  add_custom_target(
+    ${TARGET_NAME}
+    ${_ALL}
+    DEPENDS
+      "${OUTPUT_FILE}"
+  )
+
   if(_ARG_INSTALL)
     install(
       DIRECTORY