cmake: update Python linters handling

- exclude from getBuildInformation()
- fix pylint version

CMakeLists.txt

@@ -1000,6 +1000,12 @@ if(COMMAND ocv_pylint_finalize)
   ocv_pylint_add_directory_recurse(${CMAKE_CURRENT_LIST_DIR}/samples/python/tutorial_code)
   ocv_pylint_finalize()
 endif()
+if(TARGET check_pylint)
+  message(STATUS "Registered 'check_pylint' target: using ${PYLINT_EXECUTABLE} (ver: ${PYLINT_VERSION}), checks: ${PYLINT_TOTAL_TARGETS}")
+endif()
+if(TARGET check_flake8)
+  message(STATUS "Registered 'check_flake8' target: using ${FLAKE8_EXECUTABLE} (ver: ${FLAKE8_VERSION})")
+endif()
 
 if(OPENCV_GENERATE_SETUPVARS)
   include(cmake/OpenCVGenSetupVars.cmake)
@@ -1633,12 +1639,6 @@ endif()
 
 status("")
 status("  Python (for build):"  PYTHON_DEFAULT_AVAILABLE THEN "${PYTHON_DEFAULT_EXECUTABLE}" ELSE NO)
-if(PYLINT_FOUND AND PYLINT_EXECUTABLE)
-  status("    Pylint:"  PYLINT_FOUND THEN "${PYLINT_EXECUTABLE} (ver: ${PYLINT_VERSION}, checks: ${PYLINT_TOTAL_TARGETS})" ELSE NO)
-endif()
-if(FLAKE8_FOUND AND FLAKE8_EXECUTABLE)
-  status("    Flake8:"  FLAKE8_FOUND THEN "${FLAKE8_EXECUTABLE} (ver: ${FLAKE8_VERSION})" ELSE NO)
-endif()
 
 # ========================== java ==========================
 if(BUILD_JAVA)

cmake/FindPylint.cmake

@@ -16,7 +16,7 @@ if(PYLINT_EXECUTABLE AND NOT DEFINED PYLINT_VERSION)
   execute_process(COMMAND ${PYLINT_EXECUTABLE} --version RESULT_VARIABLE _result OUTPUT_VARIABLE PYLINT_VERSION_RAW)
   if(NOT _result EQUAL 0)
     ocv_clear_vars(PYLINT_EXECUTABLE PYLINT_VERSION)
-  elseif(PYLINT_VERSION_RAW MATCHES "pylint([^,]*) ([0-9\\.]+[0-9])")
+  elseif(PYLINT_VERSION_RAW MATCHES "pylint([^,\n]*) ([0-9\\.]+[0-9])")
     set(PYLINT_VERSION "${CMAKE_MATCH_2}")
   else()
     set(PYLINT_VERSION "unknown")

cmake/OpenCVPylint.cmake

@@ -122,7 +122,6 @@ function(ocv_pylint_finalize)
 
   list(LENGTH PYLINT_TARGET_ID __total)
   set(PYLINT_TOTAL_TARGETS "${__total}" CACHE INTERNAL "")
-  message(STATUS "Pylint: registered ${__total} targets. Build 'check_pylint' target to run checks (\"cmake --build . --target check_pylint\" or \"make check_pylint\")")
   configure_file("${OpenCV_SOURCE_DIR}/cmake/templates/pylint.cmake.in" "${CMAKE_BINARY_DIR}/pylint.cmake" @ONLY)
 
   add_custom_target(check_pylint