cmFindCommonDebugState: adopt event writing logic

This lays the groundwork for `find_package` also using the same
triggering logic.

Source/cmFindBase.cxx

@@ -7,6 +7,7 @@
 #include <deque>
 #include <iterator>
 #include <map>
+#include <memory>
 #include <utility>
 
 #include <cm/optional>
@@ -37,6 +38,13 @@ cmFindBase::cmFindBase(std::string findCommandName, cmExecutionStatus& status)
 {
 }
 
+cmFindBase::~cmFindBase()
+{
+  if (this->DebugState) {
+    this->DebugState->Write();
+  }
+}
+
 bool cmFindBase::ParseArguments(std::vector<std::string> const& argsIn)
 {
   if (argsIn.size() < 2) {
@@ -640,25 +648,22 @@ cmFindBaseDebugState::cmFindBaseDebugState(cmFindBase const* findBase)
 {
 }
 
-cmFindBaseDebugState::~cmFindBaseDebugState()
+cmFindBaseDebugState::~cmFindBaseDebugState() = default;
+
+void cmFindBaseDebugState::FoundAtImpl(std::string const& path,
+                                       std::string regexName)
 {
-  bool found = !this->FoundSearchLocation.path.empty();
+  this->FoundSearchLocation = DebugLibState{ std::move(regexName), path };
+}
 
-#ifndef CMAKE_BOOTSTRAP
-  // Write find event to the configure log if the log exists
-  if (cmConfigureLog* log =
-        this->FindCommand->Makefile->GetCMakeInstance()->GetConfigureLog()) {
-    // Write event if any of:
-    //   - the variable was not defined (first run)
-    //   - the variable found state does not match the new found state (state
-    //     transition)
-    if (!this->FindBaseCommand->IsDefined() ||
-        this->FindBaseCommand->IsFound() != found) {
-      this->WriteFindEvent(*log, *this->FindCommand->Makefile);
-    }
-  }
-#endif
+void cmFindBaseDebugState::FailedAtImpl(std::string const& path,
+                                        std::string regexName)
+{
+  this->FailedSearchLocations.emplace_back(std::move(regexName), path);
+}
 
+void cmFindBaseDebugState::WriteDebug() const
+{
   // clang-format off
   auto buffer =
     cmStrCat(
@@ -713,21 +718,9 @@ cmFindBaseDebugState::~cmFindBaseDebugState()
   this->FindCommand->DebugMessage(buffer);
 }
 
-void cmFindBaseDebugState::FoundAtImpl(std::string const& path,
-                                       std::string regexName)
-{
-  this->FoundSearchLocation = DebugLibState{ std::move(regexName), path };
-}
-
-void cmFindBaseDebugState::FailedAtImpl(std::string const& path,
-                                        std::string regexName)
-{
-  this->FailedSearchLocations.emplace_back(std::move(regexName), path);
-}
-
 #ifndef CMAKE_BOOTSTRAP
-void cmFindBaseDebugState::WriteFindEvent(cmConfigureLog& log,
-                                          cmMakefile const& mf) const
+void cmFindBaseDebugState::WriteEvent(cmConfigureLog& log,
+                                      cmMakefile const& mf) const
 {
   log.BeginEvent("find-v1", mf);
 

Source/cmFindBase.h

@@ -25,7 +25,7 @@ class cmFindBase : public cmFindCommon
 {
 public:
   cmFindBase(std::string findCommandName, cmExecutionStatus& status);
-  virtual ~cmFindBase() = default;
+  ~cmFindBase() override;
 
   /**
    * This is called when the command is first encountered in
@@ -42,8 +42,8 @@ protected:
   friend class cmFindBaseDebugState;
   void ExpandPaths();
 
-  bool IsFound() const;
-  bool IsDefined() const;
+  bool IsFound() const override;
+  bool IsDefined() const override;
 
   void NormalizeFindResult();
   void StoreFindResult(std::string const& value);
@@ -114,8 +114,9 @@ private:
     std::string path;
   };
 
+  void WriteDebug() const override;
 #ifndef CMAKE_BOOTSTRAP
-  void WriteFindEvent(cmConfigureLog& log, cmMakefile const& mf) const;
+  void WriteEvent(cmConfigureLog& log, cmMakefile const& mf) const override;
 #endif
 
   cmFindBase const* const FindBaseCommand;

Source/cmFindCommon.cxx

@@ -71,6 +71,8 @@ cmFindCommon::cmFindCommon(cmExecutionStatus& status)
   }
 }
 
+cmFindCommon::~cmFindCommon() = default;
+
 void cmFindCommon::SetError(std::string const& e)
 {
   this->Status.SetError(e);
@@ -492,6 +494,26 @@ void cmFindCommonDebugState::FailedAt(std::string const& path,
   this->FailedAtImpl(path, regexName);
 }
 
+void cmFindCommonDebugState::Write()
+{
+#ifndef CMAKE_BOOTSTRAP
+  // Write find event to the configure log if the log exists
+  if (cmConfigureLog* log =
+        this->FindCommand->Makefile->GetCMakeInstance()->GetConfigureLog()) {
+    // Write event if any of:
+    //   - the variable was not defined (first run)
+    //   - the variable found state does not match the new found state (state
+    //     transition)
+    if (!this->FindCommand->IsDefined() ||
+        this->FindCommand->IsFound() != this->IsFound) {
+      this->WriteEvent(*log, *this->FindCommand->Makefile);
+    }
+  }
+#endif
+
+  this->WriteDebug();
+}
+
 bool cmFindCommonDebugState::TrackSearchProgress() const
 {
   // Track search progress if debugging or logging the configure.

Source/cmFindCommon.h

@@ -14,6 +14,7 @@
 #include "cmSearchPath.h"
 #include "cmWindowsRegistry.h"
 
+class cmConfigureLog;
 class cmFindCommonDebugState;
 class cmExecutionStatus;
 class cmMakefile;
@@ -29,6 +30,7 @@ class cmFindCommon
 {
 public:
   cmFindCommon(cmExecutionStatus& status);
+  virtual ~cmFindCommon();
 
   void SetError(std::string const& e);
 
@@ -80,6 +82,9 @@ protected:
     RootPathModeBoth
   };
 
+  virtual bool IsFound() const = 0;
+  virtual bool IsDefined() const = 0;
+
   /** Construct the various path groups and labels */
   void InitializeSearchPathGroups();
 
@@ -171,11 +176,18 @@ public:
   void FailedAt(std::string const& path,
                 std::string regexName = std::string());
 
+  void Write();
+
 protected:
   virtual void FoundAtImpl(std::string const& path, std::string regexName) = 0;
   virtual void FailedAtImpl(std::string const& path,
                             std::string regexName) = 0;
 
+  virtual void WriteDebug() const = 0;
+#ifndef CMAKE_BOOTSTRAP
+  virtual void WriteEvent(cmConfigureLog& log, cmMakefile const& mf) const = 0;
+#endif
+
   cmFindCommon const* const FindCommand;
   std::string const CommandName;
   std::string const Mode;

Source/cmFindPackageCommand.cxx

@@ -60,6 +60,8 @@
 #  endif
 #endif
 
+class cmConfigureLog;
+
 namespace {
 
 using pdt = cmFindPackageCommand::PackageDescriptionType;
@@ -600,6 +602,20 @@ void cmFindPackageCommand::InheritOptions(cmFindPackageCommand* other)
   this->Quiet = other->Quiet;
 }
 
+bool cmFindPackageCommand::IsFound() const
+{
+  // TODO: track the actual found state.
+  return false;
+}
+
+bool cmFindPackageCommand::IsDefined() const
+{
+  // A `find_package` always needs to be rerun because it could create
+  // variables, provide commands, or targets. Therefore it is never
+  // "predefined" whether it is found or not.
+  return false;
+}
+
 bool cmFindPackageCommand::InitialPass(std::vector<std::string> const& args)
 {
   if (args.empty()) {
@@ -3365,7 +3381,7 @@ bool cmFindPackage(std::vector<std::string> const& args,
 cmFindPackageDebugState::cmFindPackageDebugState(
   cmFindPackageCommand const* findPackage)
   : cmFindCommonDebugState("find_package", findPackage)
-  , FindPackageCommand(findPackage)
+// , FindPackageCommand(findPackage)
 {
 }
 
@@ -3384,3 +3400,18 @@ void cmFindPackageDebugState::FailedAtImpl(std::string const& path,
   (void)path;
   (void)regexName;
 }
+
+void cmFindPackageDebugState::WriteDebug() const
+{
+}
+
+#ifndef CMAKE_BOOTSTRAP
+void cmFindPackageDebugState::WriteEvent(cmConfigureLog& log,
+                                         cmMakefile const& mf) const
+{
+  (void)log;
+  (void)mf;
+
+  // TODO
+}
+#endif

Source/cmFindPackageCommand.h

@@ -32,7 +32,9 @@ namespace std {
 /* clang-format on */
 #endif
 
+class cmConfigureLog;
 class cmExecutionStatus;
+class cmMakefile;
 class cmPackageState;
 class cmSearchPath;
 
@@ -95,6 +97,9 @@ private:
 
   void InheritOptions(cmFindPackageCommand* other);
 
+  bool IsFound() const override;
+  bool IsDefined() const override;
+
   // Try to find a package, assuming most state has already been set up. This
   // is used for recursive dependency solving, particularly when importing
   // packages via CPS. Bypasses providers if argsForProvider is empty.
@@ -353,5 +358,10 @@ private:
   void FoundAtImpl(std::string const& path, std::string regexName) override;
   void FailedAtImpl(std::string const& path, std::string regexName) override;
 
-  cmFindPackageCommand const* const FindPackageCommand;
+  void WriteDebug() const override;
+#ifndef CMAKE_BOOTSTRAP
+  void WriteEvent(cmConfigureLog& log, cmMakefile const& mf) const override;
+#endif
+
+  // cmFindPackageCommand const* const FindPackageCommand;
 };