Give Catch3 its own build names and headers

Catch2 compatibility means the API tests are written in: the macros, such
as TEST_CASE and REQUIRE, and the Catch:: namespace. It does not mean
Catch2's build names or header paths. find_package(Catch2) found Catch3,
and a project using both frameworks met two packages, two sets of targets,
two Catch.cmake modules and two catch2/ header trees with the same names.

Build names:
- CMake: project and package Catch3, targets Catch3::Catch3 and
  Catch3::Catch3WithMain, libraries Catch3 and Catch3Main, options
  CATCH3_*, lib/cmake/Catch3 with Catch3Config, and pkg-config catch3 and
  catch3-with-main. The version is Catch3's, 0.3.0, compatible within a
  minor version.
- The CMake scripts are Catch3.cmake (catch3_discover_tests),
  Catch3AddTests.cmake and Catch3ShardTests.cmake
  (catch3_add_sharded_tests); the helpers they define at ctest time have a
  catch3_ prefix. ParseAndAddCatchTests.cmake, deprecated upstream, is gone.
- Bazel //:catch3 and //:catch3_main, Meson catch3 and catch3-with-main
  (with override_dependency), Xmake catch3 and catch3_main, Premake Catch3
  and Catch3WithMain. Visual Studio projects get GUIDs of their own.
- The Progmasoft::Catch3 target and package are gone: property testing
  and snapshots are part of Catch3::Catch3. Their sources now build with
  the library's warning flags, so property failures are built field by
  field (no missing initializers) and the default property name is a
  thread-local pointer to the name its scope owns (no global destructor).

Headers: the engine moved from src/catch2 to src/Progmasoft/Catch3 with
Progmasoft names, so <catch2/catch_test_macros.hpp> is
<Progmasoft/Catch3/TestMacros.hpp>, <catch2/matchers/catch_matchers_string.hpp>
is <Progmasoft/Catch3/Matchers/String.hpp>, and interface headers are named
after their interface, such as Interfaces/IConfig.hpp. Include guards
became #pragma once. The installed headers go to include/Progmasoft.
src/Progmasoft/Context.cpp is StrategyContext.cpp, so no two sources share
a file name.

tools/scripts/upstreamFiles.txt lists the files that come from Catch2.
The license check expects BSL-1.0 on them and Progmasoft's header on the
rest of src/Progmasoft; the convenience-header check, the amalgamation
script and the surrogate tests take the engine's headers from it. The
amalgamated files are regenerated. The header-guard workflow checks for
#pragma once instead of checkguard.

Documents, the README and the release notes describe the new names.

1 files changed, 58 insertions, 0 deletions

diff --git a/src/Progmasoft/Catch3/Session.cpp b/src/Progmasoft/Catch3/Session.cpp
new file mode 100644
index 00000000..cc9ef38d
--- /dev/null
+++ b/src/Progmasoft/Catch3/Session.cpp
@@ -0,0 +1,58 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#include <Progmasoft/Catch3/Session.hpp>
+#include <Progmasoft/Catch3/Internal/Context.hpp>
+#include <Progmasoft/Catch3/Internal/Enforce.hpp>
+#include <Progmasoft/Catch3/Internal/WindowsHProxy.hpp>
+#include <Progmasoft/Catch3/Interfaces/IRegistryHub.hpp>
+
+#include <Progmasoft/Catch3/Runner.hpp>
+
+namespace Catch {
+
+    Session::Session() {
+        static bool alreadyInstantiated = false;
+        if( alreadyInstantiated ) {
+            CATCH_TRY { CATCH_INTERNAL_ERROR( "Only one instance of Catch::Session can ever be used" ); }
+            CATCH_CATCH_ALL { getMutableRegistryHub().registerStartupException(); }
+        }
+        alreadyInstantiated = true;
+    }
+    Session::~Session() {
+        Catch::cleanUp();
+    }
+
+    void Session::showHelp() const {
+        Progmasoft::Catch3::PrintHelp( m_arguments.empty() ? std::string( "tests" )
+                                                           : m_arguments.front() );
+    }
+
+    int Session::applyCommandLine( int argc, char const * const * argv ) {
+        m_arguments.assign( argv, argv + argc );
+        return 0;
+    }
+
+#if defined(CATCH_CONFIG_WCHAR) && defined(_WIN32) && defined(UNICODE)
+    int Session::applyCommandLine( int argc, wchar_t const * const * argv ) {
+        m_arguments.clear();
+        for ( int i = 0; i < argc; ++i ) {
+            int bufSize = WideCharToMultiByte( CP_UTF8, 0, argv[i], -1, nullptr, 0, nullptr, nullptr );
+            std::string utf8( static_cast<std::size_t>( bufSize ), '\0' );
+            WideCharToMultiByte( CP_UTF8, 0, argv[i], -1, &utf8[0], bufSize, nullptr, nullptr );
+            if ( !utf8.empty() ) { utf8.pop_back(); } // the terminator
+            m_arguments.push_back( utf8 );
+        }
+        return 0;
+    }
+#endif
+
+    int Session::run() {
+        return Progmasoft::Catch3::RunTests( m_arguments );
+    }
+
+} // end namespace Catch