Merge branch 'objective_c' into 'master'

Add detection of Objective-C file types

See merge request cppit/jucipp!427

src/source.cpp

@@ -83,6 +83,8 @@ Glib::RefPtr<Gsv::Language> Source::guess_language(const boost::filesystem::path
       language = language_manager->get_language("glsl");
     else if(extension == ".in" || extension == ".bak")
       return guess_language(boost::filesystem::path(file_path).replace_extension());
+    else if(extension == ".mm")
+      language = language_manager->get_language("objc");
     else if(!file_path.has_extension() && std::any_of(file_path.begin(), file_path.end(),
                                                       [](const boost::filesystem::path &path) { return path == "include"; }))
       language = language_manager->get_language("cpphdr");
@@ -101,6 +103,19 @@ Glib::RefPtr<Gsv::Language> Source::guess_language(const boost::filesystem::path
   }
   else if(language->get_id() == "opencl")
     language = language_manager->get_language("cpp");
+  else if(language->get_id() == "octave" && extension == ".m") {
+    // .m is used for both Octave and Objective-C, so try to differentiate
+    std::ifstream input(file_path.string(), std::ios::binary);
+    std::string buffer(256, '\0');
+    input.read(&buffer[0], static_cast<std::streamsize>(buffer.size()));
+    buffer.resize(static_cast<std::size_t>(input.gcount()));
+    if(input && (buffer.find("#import ") != std::string::npos ||
+                 buffer.find("@interface ") != std::string::npos ||
+                 buffer.find("/*") != std::string::npos ||
+                 buffer.find("//") != std::string::npos)) {
+      language = language_manager->get_language("objc");
+    }
+  }
   return language;
 }