Reworked the builder code to setup for more async running of the build.

builder.cpp

@@ -39,14 +39,12 @@ Builder::Builder(GUI &g, GameEngine &engine)
 FILE *start_command(string &build_cmd) {
   FILE *build_out = popen(build_cmd.c_str(), "r");
   dbc::check(build_out != nullptr, "Failed to run command.");
-
   return build_out;
 }
 
 string read_line(FILE *build_out, bool &done_out) {
   char buffer[BUF_MAX];
   char *res = fgets(buffer, BUF_MAX, build_out);
-  //!!! exception if res == nullptr
   done_out = res == nullptr;
 
   if(!done_out) {
@@ -56,33 +54,28 @@ string read_line(FILE *build_out, bool &done_out) {
   }
 }
 
-void end_build(FILE *build_out, GUI &gui, string &build_cmd) {
+bool end_build(FILE *build_out, GUI &gui, string &build_cmd) {
   int rc = pclose(build_out);
-
-  if(rc == 0) {
-    gui.build_works();
-  } else {
-    // BUG: make it not play two sounds
-    gui.build_failed(true, build_cmd);
-  }
+  return rc == 0;
 }
 
-void Builder::run_build(const string &line) {
+MatchResult Builder::parse_line(const string &line) {
   std::regex err_re("(.*?):([0-9]+):([0-9]+):\\s*(.*?):\\s*(.*)\n*");
 
   std::smatch err;
   bool match = std::regex_match(line, err, err_re);
 
   if(match) {
-    string file_name = err[1].str();
-    string lnumber = err[2].str();
-    string col = err[3].str();
-    string type = err[4].str();
-    string message = err[5].str();
-
-    gui.output(format("HIT WITH {} @ {}:{}:{} {}", type, file_name, lnumber, col, message));
-
-    game.hit(type);
+    return {
+      .match = true,
+      .file_name = err[1].str(),
+      .lnumber = err[2].str(),
+      .col = err[3].str(),
+      .type = err[4].str(),
+      .message = err[5].str(),
+    };
+  } else {
+    return { .match = false };
   }
 }
 
@@ -130,20 +123,33 @@ void Builder::run() {
       case BUILDING: {
           // check if there's output
           string line = read_line(build_out, build_done);
+
           if(build_done) {
-            end_build(build_out, gui, build_cmd);
+            bool good = end_build(build_out, gui, build_cmd);
+
+            if(good) {
+              gui.build_works();
+            } else {
+              // BUG: make it not play two sounds
+              gui.build_failed(true, build_cmd);
+            }
+
             build_out = NULL;
             state = DONE;
           } else {
-            // get the command line
-            // run the build if it's available
-            run_build(line);
+            auto m = parse_line(line);
+
+            if(m.match) {
+              gui.output(format("HIT WITH {} @ {}:{}:{} {}", m.type, m.file_name, m.lnumber, m.col, m.message));
+              game.hit(m.type);
+            }
             state = BUILDING;
           }
        }
       break;
 
       case DONE: {
+
         game.end_round();
 
         if(game.is_dead()) {