instrumentation: Add project field to cmake content files

Help/manual/cmake-instrumentation.7.rst

@@ -563,6 +563,9 @@ corresponding to the CMake invocation responsible for generating its command.
 
 Each CMake content file contains the following:
 
+  ``project``
+    The value of :variable:`CMAKE_PROJECT_NAME`.
+
   ``custom``
     An object containing arbitrary JSON data specified by the user with the
     :ref:`cmake_instrumentation CUSTOM_CONTENT` functionality of the

Source/cmInstrumentation.cxx

@@ -40,6 +40,7 @@
 #include "cmTimestamp.h"
 #include "cmUVProcessChain.h"
 #include "cmValue.h"
+#include "cmake.h"
 
 using LoadQueriesAfter = cmInstrumentation::LoadQueriesAfter;
 
@@ -234,6 +235,8 @@ void cmInstrumentation::WriteCMakeContent(
   Json::Value root;
   root["targets"] = this->DumpTargets(gg);
   root["custom"] = this->customContent;
+  root["project"] =
+    gg->GetCMakeInstance()->GetCacheDefinition("CMAKE_PROJECT_NAME").GetCStr();
   this->WriteInstrumentationJson(
     root, "data/content",
     cmStrCat("cmake-", this->ComputeSuffixTime(), ".json"));

Tests/RunCMake/Instrumentation/check-custom-content.cmake

@@ -15,6 +15,9 @@ set(firstFile "")
 foreach(content_file IN LISTS content_files)
   read_json("${content_file}" contents)
 
+  # Check project name
+  json_assert_key("${content_file}" "${contents}" project "instrumentation")
+
   # Check custom content
   string(JSON custom GET "${contents}" custom)
   json_assert_key("${content_file}" "${custom}" myString "string")