cmake: change Pylint integration

CMakeLists.txt

@@ -312,6 +312,7 @@ OCV_OPTION(CV_ENABLE_INTRINSICS       "Use intrinsic-based optimized code" ON )
 OCV_OPTION(CV_DISABLE_OPTIMIZATION    "Disable explicit optimized code (dispatched code/intrinsics/loop unrolling/etc)" OFF )
 OCV_OPTION(CV_TRACE                   "Enable OpenCV code trace" ON)
 
+OCV_OPTION(ENABLE_PYLINT              "Add target with Pylint checks"                            (${BUILD_DOCS} OR ${BUILD_EXAMPLES}) )
 
 if(ENABLE_IMPL_COLLECTION)
   add_definitions(-DCV_COLLECT_IMPL_DATA)
@@ -615,6 +616,11 @@ else()
   find_package(JNI)
 endif()
 
+if(ENABLE_PYLINT)
+  include(cmake/OpenCVPylint.cmake)
+endif()
+
+
 if(ANDROID AND ANDROID_EXECUTABLE AND ANT_EXECUTABLE AND (ANT_VERSION VERSION_GREATER 1.7) AND (ANDROID_TOOLS_Pkg_Revision GREATER 13))
   SET(CAN_BUILD_ANDROID_PROJECTS TRUE)
 else()
@@ -747,7 +753,6 @@ endif()
 # Extra OpenCV targets: uninstall, package_source, perf, etc.
 include(cmake/OpenCVExtraTargets.cmake)
 
-
 # ----------------------------------------------------------------------------
 # Process subdirectories
 # ----------------------------------------------------------------------------
@@ -847,6 +852,13 @@ if(ANDROID OR NOT UNIX)
   endif()
 endif()
 
+if(COMMAND ocv_pylint_finalize)
+  ocv_pylint_add_directory(${CMAKE_CURRENT_LIST_DIR}/samples/python)
+  ocv_pylint_add_directory(${CMAKE_CURRENT_LIST_DIR}/samples/dnn)
+  ocv_pylint_add_directory_recurse(${CMAKE_CURRENT_LIST_DIR}/samples/python/tutorial_code)
+  ocv_pylint_finalize()
+endif()
+
 # ----------------------------------------------------------------------------
 # Summary:
 # ----------------------------------------------------------------------------
@@ -1404,6 +1416,9 @@ 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()
 
 # ========================== java ==========================
 status("")

cmake/FindPylint.cmake

@@ -10,7 +10,7 @@
 #   PYLINT_VERSION
 #       A string denoting the version of pylint that has been found
 
-find_program(PYLINT_EXECUTABLE pylint PATHS /usr/bin)
+find_host_program(PYLINT_EXECUTABLE pylint PATHS /usr/bin)
 
 if(PYLINT_EXECUTABLE)
   execute_process(COMMAND ${PYLINT_EXECUTABLE} --version OUTPUT_VARIABLE PYLINT_VERSION_RAW ERROR_QUIET)

cmake/OpenCVPylint.cmake

@@ -0,0 +1,130 @@
+if(COMMAND ocv_pylint_add_target)
+  return()
+endif()
+
+find_package(Pylint QUIET)
+if(NOT PYLINT_FOUND OR NOT PYLINT_EXECUTABLE)
+  include("${CMAKE_CURRENT_LIST_DIR}/FindPylint.cmake")
+endif()
+
+if(NOT PYLINT_FOUND)
+  macro(ocv_pylint_add_target) # dummy
+  endmacro()
+  return()
+endif()
+
+macro(ocv_pylint_cleanup)
+  foreach(__id ${PYLINT_TARGET_ID})
+    ocv_clear_vars(
+        PYLINT_TARGET_${__id}_CWD
+        PYLINT_TARGET_${__id}_TARGET
+        PYLINT_TARGET_${__id}_RCFILE
+        PYLINT_TARGET_${__id}_OPTIONS
+    )
+  endforeach()
+  ocv_clear_vars(PYLINT_TARGET_ID)
+endmacro()
+ocv_pylint_cleanup()
+
+macro(ocv_pylint_add_target)
+  cmake_parse_arguments(__pylint "" "CWD;TARGET;RCFILE;" "OPTIONS" ${ARGN})
+  if(__pylint_UNPARSED_ARGUMENTS)
+    message(WARNING "Unsupported arguments: ${__pylint_UNPARSED_ARGUMENTS}
+(keep versions of opencv/opencv_contrib synchronized)
+")
+  endif()
+  ocv_assert(__pylint_TARGET)
+  set(__cwd ${__pylint_CWD})
+  if(__cwd STREQUAL "default")
+    get_filename_component(__cwd "${__pylint_TARGET}" DIRECTORY)
+  endif()
+  set(__rcfile ${__pylint_RCFILE})
+  if(NOT __rcfile AND NOT __pylint_OPTIONS)
+    if(__cwd)
+      set(__path "${__cwd}")
+    else()
+      get_filename_component(__path "${__pylint_TARGET}" DIRECTORY)
+    endif()
+    while(__path MATCHES "^${CMAKE_SOURCE_DIR}")
+      if(EXISTS "${__path}/pylintrc")
+        set(__rcfile "${__path}/pylintrc")
+        break()
+      endif()
+      if(EXISTS "${__path}/.pylintrc")
+        set(__rcfile "${__path}/.pylintrc")
+        break()
+      endif()
+      get_filename_component(__path "${__path}" DIRECTORY)
+    endwhile()
+    if(NOT __rcfile)
+      set(__rcfile "${CMAKE_BINARY_DIR}/pylintrc")
+    endif()
+  endif()
+
+  list(LENGTH PYLINT_TARGET_ID __id)
+  list(APPEND PYLINT_TARGET_ID ${__id})
+  set(PYLINT_TARGET_ID "${PYLINT_TARGET_ID}" CACHE INTERNAL "")
+  set(PYLINT_TARGET_${__id}_CWD "${__cwd}" CACHE INTERNAL "")
+  set(PYLINT_TARGET_${__id}_TARGET "${__pylint_TARGET}" CACHE INTERNAL "")
+  set(PYLINT_TARGET_${__id}_RCFILE "${__rcfile}" CACHE INTERNAL "")
+  set(PYLINT_TARGET_${__id}_OPTIONS "${__pylint_options}" CACHE INTERNAL "")
+endmacro()
+
+macro(ocv_pylint_add_directory_recurse __path)
+  file(GLOB_RECURSE __python_scripts ${__path}/*.py)
+  list(LENGTH __python_scripts __total)
+  if(__total EQUAL 0)
+    message(WARNING "Pylint: Python files are not found: ${__path}")
+  endif()
+  foreach(__script ${__python_scripts})
+    ocv_pylint_add_target(TARGET ${__script} ${ARGN})
+  endforeach()
+endmacro()
+
+macro(ocv_pylint_add_directory __path)
+  file(GLOB __python_scripts ${__path}/*.py)
+  list(LENGTH __python_scripts __total)
+  if(__total EQUAL 0)
+    message(WARNING "Pylint: Python files are not found: ${__path}")
+  endif()
+  foreach(__script ${__python_scripts})
+    ocv_pylint_add_target(TARGET ${__script} ${ARGN})
+  endforeach()
+endmacro()
+
+function(ocv_pylint_finalize)
+  if(NOT PYLINT_FOUND)
+    return()
+  endif()
+
+  file(COPY "${CMAKE_SOURCE_DIR}/platforms/scripts/pylintrc" DESTINATION "${CMAKE_BINARY_DIR}")
+
+  set(PYLINT_CONFIG_SCRIPT "")
+  ocv_cmake_script_append_var(PYLINT_CONFIG_SCRIPT
+      PYLINT_EXECUTABLE
+      PYLINT_TARGET_ID
+  )
+  set(__sources "")
+  foreach(__id ${PYLINT_TARGET_ID})
+    ocv_cmake_script_append_var(PYLINT_CONFIG_SCRIPT
+        PYLINT_TARGET_${__id}_CWD
+        PYLINT_TARGET_${__id}_TARGET
+        PYLINT_TARGET_${__id}_RCFILE
+        PYLINT_TARGET_${__id}_OPTIONS
+    )
+    list(APPEND __sources ${PYLINT_TARGET_${__id}_TARGET} ${PYLINT_TARGET_${__id}_RCFILE})
+  endforeach()
+  list(REMOVE_DUPLICATES __sources)
+
+  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
+      COMMAND ${CMAKE_COMMAND} -P "${CMAKE_BINARY_DIR}/pylint.cmake"
+      COMMENT "Running pylint"
+      DEPENDS ${__sources}
+      SOURCES ${__sources}
+  )
+endfunction()

cmake/templates/pylint.cmake.in

@@ -0,0 +1,44 @@
+@PYLINT_CONFIG_SCRIPT@
+
+set(__total 0)
+set(__passed 0)
+set(__errors 0)
+
+if(NOT DEFINED VERBOSE AND DEFINED ENV{VERBOSE})
+  set(VERBOSE "$ENV{VERBOSE}")
+endif()
+
+foreach(__id ${PYLINT_TARGET_ID})
+  message("Pylint check: ${PYLINT_TARGET_${__id}_TARGET}")
+  set(__options ${PYLINT_TARGET_${__id}_OPTIONS})
+  if(PYLINT_TARGET_${__id}_RCFILE)
+    set(__options ${__options} --rcfile=${PYLINT_TARGET_${__id}_RCFILE})
+  endif()
+  set(__cwd "${PYLINT_TARGET_${__id}_CWD}")
+  if(NOT __cwd)
+    set(__cwd ".")
+  endif()
+  if(VERBOSE)
+    message("Run: ${PYLINT_EXECUTABLE} \"${PYLINT_TARGET_${__id}_TARGET}\" ${__options}
+        directory: \"${__cwd}\"")
+  endif()
+  execute_process(COMMAND ${PYLINT_EXECUTABLE} "${PYLINT_TARGET_${__id}_TARGET}" ${__options}
+    WORKING_DIRECTORY "${__cwd}"
+    RESULT_VARIABLE __res
+  )
+  math(EXPR __total "${__total} + 1")
+  if(NOT __res EQUAL 0)
+    math(EXPR __errors "${__errors} + 1")
+  else()
+    math(EXPR __passed "${__passed} + 1")
+  endif()
+endforeach()
+
+message("Pylint status:
+    TOTAL : ${__total}
+    PASSED: ${__passed}
+    ERRORS: ${__errors}
+")
+if(NOT __errors EQUAL 0)
+  message(SEND_ERROR "ERROR: Pylint check FAILED")
+endif()

doc/tutorials/introduction/documenting_opencv/documentation_tutorial.markdown

@@ -43,9 +43,9 @@ Generate documentation {#tutorial_documentation_generate}
     make doxygen
     @endcode
 -   Open <i>doc/doxygen/html/index.html</i> file in your favorite browser
--   Test your python code:
+-   Test your Python code:
     @code{.sh}
-    make run_pylint_on_tutorials
+    make check_pylint
     @endcode
 
 Quick start {#tutorial_documentation_quick_start}
@@ -604,7 +604,7 @@ Document the function {#tutorial_documentation_steps_fun}
 6. _Optional_: describe return value of the function using the _returns_ command.
 7. _Optional_: add "See also" section with links to similar functions or classes
 8. _Optional_: add bibliographic reference if any.
-9. Test your code. (Python: "make run_pylint_on_tutorials")
+9. Test your code. (Python: "make check_pylint")
 10. Generate doxygen documentation and verify results.
 
 Write the tutorial {#tutorial_documentation_steps_tutorial}

samples/CMakeLists.txt

@@ -12,7 +12,6 @@ if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_LIST_DIR)
 
 add_subdirectory(cpp)
 add_subdirectory(java/tutorial_code)
-add_subdirectory(python/tutorial_code)
 add_subdirectory(dnn)
 add_subdirectory(gpu)
 add_subdirectory(tapi)

samples/python/tutorial_code/CMakeLists.txt

@@ -1,23 +0,0 @@
-# ----------------------------------------------------------------------------
-#  CMake file to run pylint on the tutorial python files.
-#
-# ----------------------------------------------------------------------------
-include(${CMAKE_SOURCE_DIR}/cmake/FindPylint.cmake)
-
-project(run_pylint_on_tutorials)
-
-if(PYLINT_FOUND)
-  message(STATUS "pylint version: ${PYLINT_VERSION}")
-  set(curdir "${CMAKE_CURRENT_SOURCE_DIR}")
-  file(GLOB_RECURSE PYTHON_SCRIPTS ${curdir}/*.py)
-  add_custom_target("${PROJECT_NAME}")
-
-  foreach(SCRIPT ${PYTHON_SCRIPTS})
-    get_filename_component(SCRIPT_NAME ${SCRIPT} NAME_WE)
-    add_custom_command(TARGET "${PROJECT_NAME}"
-                       COMMAND ${PYLINT_EXECUTABLE} ${SCRIPT}
-                            --rcfile=${curdir}/pylintrc
-                       COMMENT "Running pylint on : ${SCRIPT_NAME}.py"
-                      )
-  endforeach()
-endif()