[vcpkg] Delete unused --purge-tombstones and introduce BufferedPrint class (#12049)

* Introduce buffered_print class to manage buffered write patterns like in the ci command.

* Remove --purge-tombstones option.

* Law of demeter.

* Make buffered_print imobile.

* buffered_print => BufferedPrint

* Fix merge conflict.

2 files changed, 24 insertions, 2 deletions

diff --git a/toolsrc/include/vcpkg/base/system.print.h b/toolsrc/include/vcpkg/base/system.print.h
index 890c13667..abe685cf5 100644
--- a/toolsrc/include/vcpkg/base/system.print.h
+++ b/toolsrc/include/vcpkg/base/system.print.h
@@ -41,4 +41,27 @@ namespace vcpkg::System
     {
         ::vcpkg::System::details::print(Strings::concat_or_view(args...));
     }
+
+    class BufferedPrint
+    {
+        ::std::string stdout_buffer;
+        static constexpr ::std::size_t buffer_size_target = 2048;
+        static constexpr ::std::size_t expected_maximum_print = 256;
+        static constexpr ::std::size_t alloc_size = buffer_size_target + expected_maximum_print;
+
+    public:
+        BufferedPrint() { stdout_buffer.reserve(alloc_size); }
+        BufferedPrint(const BufferedPrint&) = delete;
+        BufferedPrint& operator=(const BufferedPrint&) = delete;
+        void append(::vcpkg::StringView nextView)
+        {
+            stdout_buffer.append(nextView.data(), nextView.size());
+            if (stdout_buffer.size() > buffer_size_target)
+            {
+                ::vcpkg::System::details::print(stdout_buffer);
+                stdout_buffer.clear();
+            }
+        }
+        ~BufferedPrint() { ::vcpkg::System::details::print(stdout_buffer); }
+    };
 }
diff --git a/toolsrc/include/vcpkg/binarycaching.h b/toolsrc/include/vcpkg/binarycaching.h
index d343d6c42..61af79a3f 100644
--- a/toolsrc/include/vcpkg/binarycaching.h
+++ b/toolsrc/include/vcpkg/binarycaching.h
@@ -40,8 +40,7 @@ namespace vcpkg
         /// Requests the result of `try_restore()` without actually downloading the package. Used by CI to determine

         /// missing packages.

         virtual RestoreResult precheck(const VcpkgPaths& paths,

-                                       const Dependencies::InstallPlanAction& action,

-                                       bool purge_tombstones) = 0;

+                                       const Dependencies::InstallPlanAction& action) = 0;

     };

 

     IBinaryProvider& null_binary_provider();