Fix circular dependencies in migrator

src/cli/decorators.ts

@@ -0,0 +1,23 @@
+import {ContainerBlueprint, Instantiable, isInstantiableOf} from '../di'
+import {CommandLine} from './service'
+import {Directive} from './Directive'
+import {logIfDebugging} from '../util'
+
+/**
+ * Register a class as a command-line Directive.
+ * The class must extend Directive.
+ * @constructor
+ */
+export const CLIDirective = (): ClassDecorator => {
+    return (target) => {
+        if ( isInstantiableOf(target, Directive) ) {
+            logIfDebugging('extollo.cli.decorators', 'Registering CLIDirective blueprint:', target)
+            ContainerBlueprint.getContainerBlueprint()
+                .onResolve<CommandLine>(CommandLine, cli => {
+                    cli.registerDirective(target as Instantiable<Directive>)
+                })
+        } else {
+            logIfDebugging('extollo.cli.decorators', 'Skipping CLIDirective blueprint:', target)
+        }
+    }
+}