Initial merge with xeus-clang-repl - Capture outputs (#59)

* Initial merge with xeus-clang-repl - Capture outputs

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Vassil Vassilev <v.g.vassilev@gmail.com>

Author: 3 people

CMakeLists.txt

@@ -129,7 +129,7 @@ endif ()
 function(configure_kernel kernel)
   set(XEUS_CPP_PATH "$ENV{PATH}")
   set(XEUS_CPP_LD_LIBRARY_PATH "$ENV{LD_LIBRARY_PATH}")
-  set(XEUS_CPP_RESOURCE_DIR ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/clang/${CppInterOp_CLANG_VERSION})
+  set(XEUS_CPP_RESOURCE_DIR ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/clang/${CPPINTEROP_LLVM_VERSION_MAJOR})
 
   configure_file (
     "${CMAKE_CURRENT_SOURCE_DIR}/${kernel}/kernel.json.in"

environment.yml

@@ -2,4 +2,4 @@ name: xeus-cpp
 channels:
   - conda-forge
 dependencies:
-  - xeus-cpp=0.0.1
+  - xeus-cpp

src/xinterpreter.cpp

@@ -59,6 +59,19 @@ using namespace std::placeholders;
 
 namespace xcpp
 {
+    struct StreamRedirectRAII {
+      std::string &err;
+      StreamRedirectRAII(std::string &e) : err(e) {
+        Cpp::BeginStdStreamCapture(Cpp::kStdErr);
+        Cpp::BeginStdStreamCapture(Cpp::kStdOut);
+      }
+      ~StreamRedirectRAII() {
+        std::string out = Cpp::EndStdStreamCapture();
+        err = Cpp::EndStdStreamCapture();
+        std::cout << out;
+      }
+    };
+
     void interpreter::configure_impl()
     {
         xeus::register_interpreter(this);
@@ -153,28 +166,32 @@ __get_cxx_version ()
             std::cerr.rdbuf(&null);
         }
 
+        std::string err;
+
         // Attempt normal evaluation
         try
         {
+            StreamRedirectRAII R(err);
             compilation_result = Cpp::Process(code.c_str());
         }
         catch (std::exception& e)
         {
             errorlevel = 1;
-            ename = "Standard Exception :";
+            ename = "Standard Exception: ";
             evalue = e.what();
         }
         catch (...)
         {
             errorlevel = 1;
-            ename = "Error :";
+            ename = "Error: ";
         }
 
         if (compilation_result)
         {
             errorlevel = 1;
-            ename = "Error :";
-            evalue = "Compilation error!";
+            ename = "Error: ";
+            evalue = "Compilation error! " + err;
+            std::cerr << err;
         }
 
         // Flush streams

test/test_xcpp_kernel.py

@@ -8,6 +8,7 @@
 
 import unittest
 import jupyter_kernel_test
+import platform
 
 
 class XCppTests(jupyter_kernel_test.KernelTests):
@@ -24,7 +25,12 @@ class XCppTests(jupyter_kernel_test.KernelTests):
     code_stderr = '#include <iostream>\nstd::cerr << "oops" << std::endl;'
 
     # Pager: code that should display something (anything) in the pager
-    #code_page_something = "?std::vector"
+    code_page_something = "?std::vector"
+
+    # Exception throwing
+    # TODO: Remove 'if' when test work on MacOS/arm64. Throw Exceptions make
+    # kernel/test non-workable.
+    ###code_generate_error = 'throw std::runtime_error("Unknown exception");' if platform.system() != "Darwin" or platform.processor() != 'arm' else ''
 
     # Samples of code which generate a result value (ie, some text
     # displayed as Out[n])
@@ -41,8 +47,45 @@ class XCppTests(jupyter_kernel_test.KernelTests):
         {
             'code': '#include <string>\n#include "xcpp/xdisplay.hpp"\nstd::string test("foobar");\nxcpp::display(test);',
             'mime': 'text/plain'
+        },
+        {
+            'code': """
+#include <string>
+#include <fstream>
+#include "nlohmann/json.hpp"
+#include "xtl/xbase64.hpp"
+namespace im {
+  struct image {
+    inline image(const std::string& filename) {
+      std::ifstream fin(filename, std::ios::binary);
+      m_buffer << fin.rdbuf();
+    }
+    std::stringstream m_buffer;
+  };
+  nlohmann::json mime_bundle_repr(const image& i) {
+    auto bundle = nlohmann::json::object();
+    bundle["image/png"] = xtl::base64encode(i.m_buffer.str());
+    return bundle;
+  }
+}
+#include "xcpp/xdisplay.hpp"
+im::image marie("../notebooks/images/marie.png");
+xcpp::display(marie);""",
+            'mime': 'image/png'
         }
     ]
 
+
+class XCppTests2(jupyter_kernel_test.KernelTests):
+
+    kernel_name = 'xcpp'
+
+    # language_info.name in a kernel_info_reply should match this
+    language_name = 'C++'
+
+    # Code that should write the exact string `hello, world` to STDOUT
+    code_hello_world = '#include <stdio.h>\nprintf("hello, world");'
+
+
 if __name__ == '__main__':
     unittest.main()