Better implementation of --logdomains option.

src/editor/editor_main.cpp

@@ -81,9 +81,7 @@ int main(int argc, char** argv)
 			          << "\n";
 			return 0;
 		} else if(val == "--logdomains") {
-			// domain list is hardcoded here because I don't grok
-			// C++ well enough to add a log class hook to get it.
-			std::cerr << "general, ai, config, display, engine, network, filesystem, audio, paths\n";
+		  std::cout << lg::list_logdomains() << "\n";
 			return 0;
 		}
 	}

src/game.cpp

@@ -1763,9 +1763,7 @@ static int play_game(int argc, char** argv)
 
 			return 0;
 		} else if(val == "--logdomains") {
-			// domain list is hardcoded here because I don't grok
-			// C++ well enough to add a log class hook to get it.
-			std::cerr << "general, ai, config, display, engine, network, filesystem, audio, paths\n";
+			std::cout << lg::list_logdomains() << "\n";
 			return 0;
 		}
 	}

src/log.cpp

@@ -78,6 +78,20 @@ bool set_log_domain_severity(std::string const &name, int severity)
 	return true;
 }
 
+std::string list_logdomains()
+{
+	std::vector< logd >::iterator
+		it_begin = log_domains.begin(),
+		it_end = log_domains.end(),
+		it;
+ 	std::string domainlist = "";
+	for(it = it_begin; it != it_end; ++it) {
+		if (it != it_begin)
+			domainlist += ", ";
+		domainlist += it->name_;
+	}
+	return domainlist;
+}
 
 bool logger::dont_log(log_domain const &domain) const
 {

src/log.hpp

@@ -29,6 +29,7 @@ public:
 };
 
 bool set_log_domain_severity(std::string const &name, int severity);
+std::string list_logdomains();
 
 class logger {
 	char const *name_;