Add --check/-c parameter to c4script for syntax checking

include/c4script/c4script.h

@@ -23,6 +23,9 @@ extern "C" {
 int c4s_runfile(const char *filename);
 int c4s_runstring(const char *script);
 
+int c4s_checkfile(const char *filename);
+int c4s_checkstring(const char *script);
+
 #ifdef __cplusplus
 }
 #endif

src/script/C4ScriptMain.cpp

@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <getopt.h>
 
 int usage(const char *argv0)
 {
@@ -26,21 +27,55 @@ int usage(const char *argv0)
 	return 1;
 }
 
-int main(int argc, const char * argv[])
+int main(int argc, char *const argv[])
 {
 	if (argc < 2)
 		return usage(argv[0]);
 
-	if (strcmp(argv[1], "-e") == 0)
+	bool check = false;
+	char *runstring = nullptr;
+
+	while (1)
 	{
-		if (argc != 3)
+		static option long_options[] =
+		{
+			{"check", no_argument, 0, 'c'},
+			{"execute", required_argument, 0, 'e'},
+			{0, 0, 0, 0}
+		};
+
+		int option_index;
+		int c = getopt_long(argc, argv, "ce:", long_options, &option_index);
+		if (c == -1) break;
+		switch (c)
+		{
+		case 'c':
+			check = true;
+			break;
+		case 'e':
+			runstring = optarg;
+			break;
+		default:
 			return usage(argv[0]);
-		return c4s_runstring(argv[2]);
+		}
+	}
+
+	if (runstring)
+	{
+		if (argc - optind != 0)
+			return usage(argv[0]);
+		if (check)
+			return c4s_checkstring(runstring);
+		else
+			return c4s_runstring(runstring);
 	}
 	else
 	{
-		if (argc != 2)
+		if (argc - optind != 1)
 			return usage(argv[0]);
-		return c4s_runfile(argv[1]);
+		if (check)
+			return c4s_checkfile(argv[optind]);
+		else
+			return c4s_runfile(argv[optind]);
 	}
 }

src/script/C4ScriptStandalone.cpp

@@ -31,7 +31,7 @@ void C4DefList::SortByPriority() {}
 void C4DefList::CallEveryDefinition() {}
 void C4DefList::ResetIncludeDependencies() {}
 
-void InitializeC4Script()
+static void InitializeC4Script()
 {
 	InitCoreFunctionMap(&ScriptEngine);
 
@@ -39,18 +39,22 @@ void InitializeC4Script()
 	FixedRandom(time(nullptr));
 }
 
-C4Value RunLoadedC4Script()
+static void ClearC4Script()
+{
+	GameScript.Clear();
+	ScriptEngine.Clear();
+}
+
+static C4Value RunLoadedC4Script()
 {
 	// Link script engine (resolve includes/appends, generate code)
 	ScriptEngine.Link(nullptr);
 
 	C4Value result = GameScript.Call("Main");
-	GameScript.Clear();
-	ScriptEngine.Clear();
 	return result;
 }
 
-int c4s_runfile(const char * filename)
+static int RunFile(const char * filename, bool checkOnly)
 {
 	C4Group File;
 	if (!File.Open(GetWorkingDirectory()))
@@ -70,14 +74,25 @@ int c4s_runfile(const char * filename)
 
 	InitializeC4Script();
 	GameScript.Load(File, fn.getData(), nullptr, nullptr);
-	RunLoadedC4Script();
+	if (!checkOnly)
-	return 0;
+		RunLoadedC4Script();
+	ClearC4Script();
+	return ScriptEngine.errCnt;
 }
 
-int c4s_runstring(const char *script)
+static int RunString(const char *script, bool checkOnly)
 {
 	InitializeC4Script();
 	GameScript.LoadData("<memory>", script, nullptr);
-	RunLoadedC4Script();
+	if (!checkOnly)
-	return 0;
+		RunLoadedC4Script();
+	ClearC4Script();
+	return ScriptEngine.errCnt;
 }
+
+
+int c4s_runfile(const char *filename) { return RunFile(filename, false); }
+int c4s_runstring(const char *script) { return RunString(script, false); }
+
+int c4s_checkfile(const char *filename) { return RunFile(filename, true); }
+int c4s_checkstring(const char *script) { return RunString(script, true); }