From d254803ed1a27f734b6a5b2d1a52b74cdf56a525 Mon Sep 17 00:00:00 2001
From: Andrey Astafyev <dev@246060.ru>
Date: Sat, 17 Aug 2019 11:19:08 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D1=80=D0=B0=D0=B2=D0=BA=D0=B0=20=D1=84?=
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---
 CMLibBreathe.cmake | 37 +++++++++++++++++++++++++------------
 CMLibDoxygen.cmake | 22 +++++++++++++++-------
 2 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/CMLibBreathe.cmake b/CMLibBreathe.cmake
index 37ea098..9156701 100644
--- a/CMLibBreathe.cmake
+++ b/CMLibBreathe.cmake
@@ -1,17 +1,27 @@
-set(BUILD_BREATHE_DOC OFF CACHE STRING "Enable documntation in Breathe format")
-set_property(CACHE BUILD_BREATHE_DOC PROPERTY STRINGS ON OFF)
+set(BREATHE_FOUND AUTO CACHE STRING "Enable Breathe documentation generator")
+set_property(CACHE BREATHE_FOUND PROPERTY STRINGS ON OFF AUTO)
+
+find_package(Doxygen)
+find_package(Perl)
+set(Python_ADDITIONAL_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2)
+find_package(PythonInterp)
+if (PYTHONINTERP_FOUND)
+  find_package(Sphinx)
+  include(FindPythonModule)
+  find_python_module(breathe)
+  find_python_module(recommonmark)
+  if(DOXYGEN_FOUND AND PERL_FOUND AND PYTHONINTERP_FOUND AND SPHINX_FOUND AND breathe_FOUND AND recommonmark_FOUND)
+    set(BREATHE_FOUND ON CACHE FORCE)
+  else()
+    set(BREATHE_FOUND OFF CACHE FORCE)
+  endif()
+else()
+  set(BREATHE_FOUND OFF CACHE FORCE)
+endif()
+
 
 function(add_breathe_target)
-  if(BUILD_BREATHE_DOC)
-    find_package(Doxygen REQUIRED)
-    find_package(Perl REQUIRED)
-    set(Python_ADDITIONAL_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2)
-    find_package(PythonInterp REQUIRED)
-    find_package(Sphinx REQUIRED)
-    include(FindPythonModule)
-    find_python_module(breathe REQUIRED)
-    find_python_module(recommonmark REQUIRED)
-
+  if(BREATHE_FOUND)
     set(options)
     set(oneValueArgs SOURCE_DIR BUILD_DIR CACHE_DIR HTML_DIR DOXY_FILE CONF_FILE TARGET_NAME COMMENT)
     set(multiValueArgs)
@@ -28,5 +38,8 @@ function(add_breathe_target)
                                                  ${_BREATHE_HTML_DIR}
       COMMENT "Building ${_BREATHE_TARGET_NAME} documentation with Breathe"
       )
+  else()
+    add_custom_target(${_BREATHE_TARGET_NAME} VERBATIM
+      COMMENT "Breathe is not found. Skipping target ${_BREATHE_TARGET_NAME} build")
   endif()
 endfunction()
diff --git a/CMLibDoxygen.cmake b/CMLibDoxygen.cmake
index 95816a6..9014e8c 100644
--- a/CMLibDoxygen.cmake
+++ b/CMLibDoxygen.cmake
@@ -1,10 +1,16 @@
-option(BUILD_DOXYGEN_DOC "Build documentation with Doxygen" OFF)
-set_property(CACHE BUILD_DOXYGEN_DOC PROPERTY STRINGS ON OFF)
+set(DOXYGEN_FOUND AUTO CACHE STRING "Enable Doxygen documentation generator")
+set_property(CACHE DOXYGEN_FOUND PROPERTY STRINGS ON OFF AUTO)
+
+find_package(Doxygen)
+if (DOXYGEN_FOUND)
+  set(DOXYGEN_FOUND ON CACHE FORCE)
+else()
+  set(DOXYGEN_FOUND OFF CACHE FORCE)
+endif()
+
 
 function(add_doxygen_target)
-  if (BUILD_DOXYGEN_DOC)
-    find_package(Doxygen REQUIRED)
-
+  if (DOXYGEN_FOUND)
     set(options)
     set(oneValueArgs TARGET_NAME IN OUT)
     set(multiValueArgs)
@@ -18,7 +24,9 @@ function(add_doxygen_target)
       COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
       COMMENT "Generating API documentation with Doxygen"
-      VERBATIM )
+      VERBATIM)
+  else()
+    add_custom_target(${_DOXYGEN_TARGET_NAME} VERBATIM
+      COMMENT "Doxygen is not found. Skipping target ${_BREATHE_TARGET_NAME} build")
   endif()
 endfunction()
-