feat: support custom theme helpers

dist/cli/error.js

@@ -61,7 +61,7 @@ Error-handling routines for HackMyResume.
           stack = ex.stack || (ex.inner && ex.inner.stack);
           stack && o(chalk.gray(stack));
         }
-        if (shouldExit) {
+        if (shouldExit || ex.exit) {
           if (this.debug) {
             o(chalk.cyan('Exiting with error code ' + ex.fluenterror.toString()));
           }
@@ -262,6 +262,10 @@ Error-handling routines for HackMyResume.
       case HMSTATUS.unknownSchema:
         msg = M2C(this.msgs.unknownSchema.msg[0]);
         etype = 'error';
+        break;
+      case HMSTATUS.themeHelperLoad:
+        msg = printf(M2C(this.msgs.themeHelperLoad.msg), ex.glob);
+        etype = 'error';
     }
     return {
       msg: msg,

dist/cli/msg.yml

@@ -132,3 +132,8 @@ errors:
           "basics": {
             "name": "John Doe"
           }
+  themeHelperLoad:
+    msg: >-
+      An error occurred while attempting to load the '%s' theme helper. Is the
+      theme correctly installed?
+    dummy: dontcare