starting to enhance Slic3r::Log; adding tests.

src/CMakeLists.txt

@@ -198,6 +198,7 @@ add_library(libslic3r STATIC
     ${LIBDIR}/libslic3r/LayerRegionFill.cpp
     ${LIBDIR}/libslic3r/LayerHeightSpline.cpp
     ${LIBDIR}/libslic3r/Line.cpp
+    ${LIBDIR}/libslic3r/Log.cpp
     ${LIBDIR}/libslic3r/Model.cpp
     ${LIBDIR}/libslic3r/MotionPlanner.cpp
     ${LIBDIR}/libslic3r/MultiPoint.cpp
@@ -284,18 +285,19 @@ set(UI_TEST_SOURCES
 set(SLIC3R_TEST_SOURCES
     ${TESTDIR}/test_harness.cpp
     ${TESTDIR}/test_data.cpp
-    ${TESTDIR}/libslic3r/test_trianglemesh.cpp
     ${TESTDIR}/libslic3r/test_config.cpp
-    ${TESTDIR}/libslic3r/test_support_material.cpp
     ${TESTDIR}/libslic3r/test_fill.cpp
     ${TESTDIR}/libslic3r/test_flow.cpp
-    ${TESTDIR}/libslic3r/test_model.cpp
-    ${TESTDIR}/libslic3r/test_printgcode.cpp
-    ${TESTDIR}/libslic3r/test_print.cpp
-    ${TESTDIR}/libslic3r/test_skirt_brim.cpp
-    ${TESTDIR}/libslic3r/test_test_data.cpp
-    ${TESTDIR}/libslic3r/test_geometry.cpp
     ${TESTDIR}/libslic3r/test_gcodewriter.cpp
+    ${TESTDIR}/libslic3r/test_geometry.cpp
+    ${TESTDIR}/libslic3r/test_log.cpp
+    ${TESTDIR}/libslic3r/test_model.cpp
+    ${TESTDIR}/libslic3r/test_print.cpp
+    ${TESTDIR}/libslic3r/test_printgcode.cpp
+    ${TESTDIR}/libslic3r/test_skirt_brim.cpp
+    ${TESTDIR}/libslic3r/test_support_material.cpp
+    ${TESTDIR}/libslic3r/test_test_data.cpp
+    ${TESTDIR}/libslic3r/test_trianglemesh.cpp
 )
 
 

src/test/libslic3r/test_log.cpp

@@ -0,0 +1,119 @@
+#include <catch.hpp>
+#include <test_options.hpp>
+#include "Log.hpp"
+
+using namespace std::literals::string_literals;
+using namespace Slic3r;
+
+SCENARIO( "_Log output with std::string methods" ) {
+    GIVEN("A log stream and a _Log object") {
+        std::stringstream log;
+        std::unique_ptr<_Log> cut { _Log::make_log(log) };
+        WHEN("fatal_error is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->fatal_error("Topic", "This");
+            THEN("Output string is Topic  FERR: This\\n") {
+                REQUIRE(log.str() == "Topic  FERR: This\n");
+            }
+        }
+        WHEN("error is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->error("Topic", "This");
+            THEN("Output string is Topic   ERR: This\\n") {
+                REQUIRE(log.str() == "Topic   ERR: This\n");
+            }
+        }
+        WHEN("info is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->info("Topic", "This");
+            THEN("Output string is Topic  INFO: This\\n") {
+                REQUIRE(log.str() == "Topic  INFO: This\n");
+            }
+        }
+        WHEN("warn is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->warn("Topic", "This");
+            THEN("Output string is Topic  WARN: This\\n") {
+                REQUIRE(log.str() == "Topic  WARN: This\n");
+            }
+        }
+        WHEN("info is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->info("Topic", "This");
+            THEN("Output string is Topic  INFO: This\\n") {
+                REQUIRE(log.str() == "Topic  INFO: This\n");
+            }
+        }
+        WHEN("debug is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->debug("Topic", "This");
+            THEN("Output string is Topic DEBUG: This\\n") {
+                REQUIRE(log.str() == "Topic DEBUG: This\n");
+            }
+        }
+        WHEN("msg is called with text \"This\"") {
+            log.clear();
+            cut->raw("This");
+            THEN("Output string is This\\n") {
+                REQUIRE(log.str() == "This\n");
+            }
+        }
+    }
+}
+SCENARIO( "_Log output with << methods" ) {
+    GIVEN("A log stream and a _Log object") {
+        std::stringstream log;
+        std::unique_ptr<_Log> cut { _Log::make_log(log) };
+        WHEN("fatal_error is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->fatal_error("Topic") << "This";
+            THEN("Output string is Topic  FERR: This") {
+                REQUIRE(log.str() == "Topic  FERR: This");
+            }
+        }
+        WHEN("error is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->error("Topic") << "This";
+            THEN("Output string is Topic   ERR: This") {
+                REQUIRE(log.str() == "Topic   ERR: This");
+            }
+        }
+        WHEN("info is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->info("Topic") << "This";
+            THEN("Output string is Topic  INFO: This") {
+                REQUIRE(log.str() == "Topic  INFO: This");
+            }
+        }
+        WHEN("warn is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->warn("Topic") << "This";
+            THEN("Output string is Topic  WARN: This") {
+                REQUIRE(log.str() == "Topic  WARN: This");
+            }
+        }
+        WHEN("info is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->info("Topic") << "This";
+            THEN("Output string is Topic  INFO: This") {
+                REQUIRE(log.str() == "Topic  INFO: This");
+            }
+        }
+        WHEN("debug is called with topic \"Topic\" and text \"This\"") {
+            log.clear();
+            cut->debug("Topic") << "This";
+            THEN("Output string is Topic DEBUG: This") {
+                REQUIRE(log.str() == "Topic DEBUG: This");
+            }
+        }
+        WHEN("msg is called with text \"This\"") {
+            log.clear();
+            cut->raw() << "This";
+            THEN("Output string is This") {
+                REQUIRE(log.str() == "This");
+            }
+        }
+
+    }
+}
+

xs/src/libslic3r/Log.cpp

@@ -0,0 +1,76 @@
+#include "Log.hpp"
+#include <sstream>
+#include <iostream>
+#include <string>
+#include <iomanip>
+
+namespace Slic3r {
+
+std::unique_ptr<_Log> slic3r_log {_Log::make_log()};
+
+_Log::_Log() : _out(std::clog), _wout(std::wclog) {
+}
+
+_Log::_Log(std::ostream& out) : _out(out), _wout(std::wclog) {
+}
+_Log::_Log(std::wostream& out) : _out(std::clog), _wout(out) {
+}
+
+void _Log::fatal_error(const std::string& topic, const std::wstring& message) {
+//    _wout << this->converter.from_bytes(topic);
+    _wout << std::setw(6) << "FERR" << ": ";
+    _wout << message << std::endl;
+}
+void _Log::fatal_error(const std::string& topic, const std::string& message) {
+    this->fatal_error(topic) << message << std::endl;
+}
+std::ostream& _Log::fatal_error(const std::string& topic) {
+    _out << topic << std::setfill(' ') << std::setw(6) << "FERR" << ": ";
+    return _out;
+}
+
+void _Log::error(const std::string& topic, const std::string& message) {
+    this->error(topic) << message << std::endl;
+}
+std::ostream& _Log::error(const std::string& topic) {
+    _out << topic << std::setfill(' ') << std::setw(6) << "ERR" << ": ";
+    return _out;
+}
+
+void _Log::info(const std::string& topic, const std::string& message) {
+    this->info(topic) << message << std::endl;
+}
+
+std::ostream& _Log::info(const std::string& topic) {
+    _out << topic << std::setfill(' ') << std::setw(6) << "INFO" << ": ";
+    return _out;
+}
+
+void _Log::warn(const std::string& topic, const std::string& message) {
+    this->warn(topic) << message << std::endl;
+}
+
+std::ostream& _Log::warn(const std::string& topic) {
+    _out << topic << std::setfill(' ') << std::setw(6) << "WARN" << ": ";
+    return _out;
+}
+
+void _Log::debug(const std::string& topic, const std::string& message) {
+    this->debug(topic) << message << std::endl;
+}
+
+std::ostream& _Log::debug(const std::string& topic) {
+    _out << topic << std::setfill(' ') << std::setw(6) << "DEBUG" << ": ";
+    return _out;
+}
+
+void _Log::raw(const std::string& message) {
+    this->raw() << message << std::endl;
+}
+std::ostream& _Log::raw() {
+    return _out;
+}
+
+
+
+} // Slic3r

xs/src/libslic3r/Log.hpp

@@ -5,14 +5,68 @@
 #include <vector>
 #include <sstream>
 #include <iostream>
+#include <memory>
+#include <locale>
+#include <codecvt> // good until c++17
 
 namespace Slic3r {
 
+/// Singleton instance implementing logging functionality in Slic3r
+/// Basic functionality is stubbed in currently, may pass through to Boost::Log
+/// eventually.
+class _Log {
+public:
+    static std::unique_ptr<_Log> make_log() {
+        std::unique_ptr<_Log> tmp {new _Log()};
+        return tmp;
+    }
+    static std::unique_ptr<_Log> make_log(std::ostream& out) {
+        std::unique_ptr<_Log> tmp {new _Log(out)};
+        return tmp;
+    }
+    static std::unique_ptr<_Log> make_log(std::wostream& out) {
+        std::unique_ptr<_Log> tmp {new _Log(out)};
+        return tmp;
+    }
+    void fatal_error(const std::string& topic, const std::wstring& message);
+    void fatal_error(const std::string& topic, const std::string& message);
+    std::ostream& fatal_error(const std::string& topic);
+
+    void error(const std::string& topic, const std::wstring& message);
+    void error(const std::string& topic, const std::string& message);
+    std::ostream& error(const std::string& topic);
+
+    void info(const std::string& topic, const std::string& message);
+    std::ostream& info(const std::string& topic);
+    void debug(const std::string& topic, const std::string& message);
+    std::ostream& debug(const std::string& topic);
+    void warn(const std::string& topic, const std::string& message);
+    std::ostream& warn(const std::string& topic);
+    void raw(const std::string& message);
+    std::ostream& raw();
+
+//    _Log(_Log const&)            = delete;
+//    void operator=(_Log const&)  = delete;
+private:
+    std::ostream& _out;
+    std::wostream& _wout;
+    _Log();
+    _Log(std::ostream& out);
+    _Log(std::wostream& out);
+
+    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
+
+};
+
+/// Global log reference; initialized in Log.cpp
+extern std::unique_ptr<_Log> slic3r_log;
+
+/// Static class for referencing the various logging functions. Refers to
+///
 class Log {
 public:
     static void fatal_error(std::string topic, std::wstring message) {
-        std::cerr << topic << " FERR" << ": ";
-        std::wcerr << message << std::endl;
+        slic3r_log->fatal_error(topic, message);
     }
     static void error(std::string topic, std::wstring message) {
         std::cerr << topic << "  ERR" << ": ";
@@ -67,6 +121,11 @@ public:
         std::cerr << topic << "  INFO" << ": ";
         return std::cerr;
     }
+
+    /// Unadorned ostream output for multiline constructions.
+    static std::ostream& raw() {
+        return std::cerr;
+    }
 };
 
 /// Utility debug function to transform a std::vector of anything that