Add option to run internal scripts

ownlang-desktop/src/main/java/com/annimon/ownlang/Main.java

@@ -94,6 +94,17 @@ public final class Main {
                     Sandbox.main(createOwnLangArgs(args, i + 1));
                     return;
 
+                case "run":
+                    final String scriptName;
+                    if (i + 1 < args.length) {
+                        scriptName = args[i + 1];
+                        createOwnLangArgs(args, i + 2);
+                    } else {
+                        scriptName = "listScripts";
+                    }
+                    run(RunOptions.script(scriptName));
+                    return;
+
                 default:
                     if (options.programSource == null) {
                         options.programSource = args[i];
@@ -124,6 +135,7 @@ public final class Main {
                       -a, --showast       Show AST of program
                       -t, --showtokens    Show lexical tokens
                       -m, --showtime      Show elapsed time of parsing and execution
+                  ownlang run <scriptName>
                 """);
     }
 

ownlang-desktop/src/main/java/com/annimon/ownlang/RunOptions.java

@@ -6,6 +6,7 @@ import static com.annimon.ownlang.util.input.InputSourceDetector.RESOURCE_PREFIX
 
 public class RunOptions {
     private static final String DEFAULT_PROGRAM = "program.own";
+    private static final String RES_SCRIPTS = "/scripts/";
 
     // input
     String programPath;
@@ -21,6 +22,13 @@ public class RunOptions {
 
     private final InputSourceDetector inputSourceDetector = new InputSourceDetector();
 
+    static RunOptions script(String name) {
+        final var options = new RunOptions();
+        options.programPath = InputSourceDetector.RESOURCE_PREFIX
+                + RES_SCRIPTS + name.toLowerCase() + ".own";
+        return options;
+    }
+
     boolean linterEnabled() {
         return lintMode != null && lintMode != LinterStage.Mode.NONE;
     }

ownlang-desktop/src/main/resources/scripts/listscripts.own

@@ -0,0 +1,6 @@
+println "Available scripts:
+  checkUpdate - checks updates on GitHub
+
+To run a script use command:
+ ownlang run checkUpdate
+"