feat: allow stacking sections (#117)

* feat: indent messages inside section

* test: test section message indentation

CMakeLists.txt

@@ -34,6 +34,11 @@ if(ASSERT_ENABLE_TESTS)
     NAME "internal assertion message formatting"
     COMMAND "${CMAKE_COMMAND}"
       -P ${CMAKE_CURRENT_SOURCE_DIR}/test/InternalFormatMessage.cmake)
+
+  add_test(
+    NAME "section creation"
+    COMMAND "${CMAKE_COMMAND}"
+      -P ${CMAKE_CURRENT_SOURCE_DIR}/test/SectionCreation.cmake)
 endif()
 
 if(ASSERT_ENABLE_INSTALL)

cmake/Assertion.cmake

@@ -259,6 +259,7 @@ endfunction()
 # macro to end the test section.
 macro(section NAME)
   message(CHECK_START "${NAME}")
+  list(APPEND CMAKE_MESSAGE_INDENT "  ")
 endmacro()
 
 # Ends the current test section.
@@ -267,5 +268,6 @@ endmacro()
 #
 # This macro ends the current test section and marks it as passed.
 macro(endsection)
+  list(POP_BACK CMAKE_MESSAGE_INDENT)
   message(CHECK_PASS passed)
 endmacro()

test/SectionCreation.cmake

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.5)
+
+find_package(Assertion REQUIRED PATHS ${CMAKE_CURRENT_LIST_DIR}/../cmake)
+
+section("first section")
+  assert(CMAKE_MESSAGE_INDENT STREQUAL "  ")
+
+  section("second section")
+    assert(CMAKE_MESSAGE_INDENT STREQUAL "  ;  ")
+  endsection()
+
+  assert(CMAKE_MESSAGE_INDENT STREQUAL "  ")
+endsection()