Merge pull request opencv#14078 from alalek:test_python_from_modules

Author: alalek

cmake/OpenCVUtils.cmake

@@ -1777,3 +1777,22 @@ macro(ocv_git_describe var_name path)
     set(${var_name} "unknown")
   endif()
 endmacro()
+
+
+# ocv_update_file(filepath content [VERBOSE])
+# - write content to file
+# - will not change modification time in case when file already exists and content has not changed
+function(ocv_update_file filepath content)
+  if(EXISTS "${filepath}")
+    file(READ "${filepath}" actual_content)
+  else()
+    set(actual_content "")
+  endif()
+  if("${actual_content}" STREQUAL "${content}")
+    if(";${ARGN};" MATCHES ";VERBOSE;")
+      message(STATUS "${filepath} contains the same content")
+    endif()
+  else()
+    file(WRITE "${filepath}" "${content}")
+  endif()
+endfunction()

doc/CMakeLists.txt

@@ -15,7 +15,7 @@ if(DOXYGEN_FOUND)
 
   # not documented modules list
   set(blacklist "${DOXYGEN_BLACKLIST}")
-  list(APPEND blacklist "ts" "java_bindings_generator" "java" "python_bindings_generator" "python2" "python3" "js" "world")
+  list(APPEND blacklist "ts" "world")
   unset(CMAKE_DOXYGEN_TUTORIAL_CONTRIB_ROOT)
   unset(CMAKE_DOXYGEN_TUTORIAL_JS_ROOT)
 
@@ -32,7 +32,16 @@ if(DOXYGEN_FOUND)
   set(refs_extra)
   set(deps)
   foreach(m ${OPENCV_MODULES_MAIN} ${OPENCV_MODULES_EXTRA})
+    set(the_module "${m}")
+    if(NOT the_module MATCHES "^opencv_")
+      set(the_module "opencv_${m}")
+    endif()
     list(FIND blacklist ${m} _pos)
+    if(NOT EXISTS "${OPENCV_MODULE_${the_module}_LOCATION}/include"
+        AND NOT EXISTS "${OPENCV_MODULE_${the_module}_LOCATION}/doc"
+    )
+      set(_pos -2)  # blacklist
+    endif()
     if(${_pos} EQUAL -1)
       list(APPEND CMAKE_DOXYGEN_ENABLED_SECTIONS "HAVE_opencv_${m}")
       # include folder