Beautify examples

docs/overview/automatic.rst

@@ -8,7 +8,8 @@ Build instructions from Hunter archive triggered automatically when
 ``hunter_add_package`` function called. Hence there is no need to specify
 dependencies in a raw ``README`` file like:
 
-::
+.. code-block:: none
+  :emphasize-lines: 2, 5
 
   For OSX please do:
   > brew install foo boo
@@ -22,7 +23,8 @@ dependencies in a raw ``README`` file like:
 
 Now it's simply:
 
-::
+.. code-block:: none
+  :emphasize-lines: 2
 
   Just run build:
   > cmake -H. -B_builds # dependencies installed automatically
@@ -34,6 +36,7 @@ Optional dependencies
 Optional dependency? No problems, expressed in a pretty clean way:
 
 .. code-block:: cmake
+  :emphasize-lines: 4
 
   # required dependencies
   hunter_add_package(foo)
@@ -50,7 +53,8 @@ Same commands:
 
 instead of:
 
-::
+.. code-block:: none
+  :emphasize-lines: 2, 3, 6
 
   Additionally if you want bar support please run:
   > brew install bar # OSX
@@ -68,16 +72,19 @@ Note that such approach differs from
 duplication of logic in many cases even if ``requirements.txt`` do downloads
 automatically too.
 
-Imagine we have to specify dependencies in ``requirements`` file and there is
-user's option:
+Imagine we have to specify dependencies in some kind of ``requirements.cmake``
+file and there is user's option:
 
 .. code-block:: cmake
+  :emphasize-lines: 3
+
+  # requirements.cmake
 
   if(WIN32 AND BUILD_WITH_BAR)
-    # install Bar
+    command_to_install(Bar)
   endif()
 
-In case it's not CMake code this will look even fancy:
+In case it's not CMake code this will look even fancy, say ``requirements.json``:
 
 .. code-block:: json
 
@@ -93,12 +100,25 @@ In case it's not CMake code this will look even fancy:
 You have to repeat same condition in ``CMakeLists.txt`` file:
 
 .. code-block:: cmake
+  :emphasize-lines: 3
+
+  # requirements.cmake
+
+  if(WIN32 AND BUILD_WITH_BAR)
+    command_to_install(Bar)
+  endif()
+
+.. code-block:: cmake
+  :emphasize-lines: 3
+
+  # CMakeLists.txt
 
   if(WIN32 AND BUILD_WITH_BAR)
     find_package(Bar CONFIG REQUIRED)
+    target_compile_definitions(... PUBLIC "WITH_BAR")
   endif()
 
-In case this part change you must not to forget to modify ``requirements``
+In case when this part will change you must not to forget to modify ``requirements``
 accordingly too. And real world libraries can have nontrivial chain of conditions, e.g.
 `OpenCV components <https://github.com/Itseez/opencv/blob/ec63343f34658d9b0ec94dc15e1b71e8f7d1d553/CMakeLists.txt#L170>`__.