[scripts][editor_cli] Add prefix check before editor startup

This will ensure that the editor has a valid
prefix structure to start with.

beat/editor/scripts/editor_cli.py

@@ -46,6 +46,8 @@ from beat.cmdline.decorators import raise_on_error
 from beat.cmdline.decorators import verbosity_option
 
 from ..utils import setup_logger
+from ..utils import check_prefix_folders
+from ..utils import check_prefix_dataformats
 from ..widgets.mainwindow import MainWindow
 from ..widgets.assetwidget import AssetWidget
 from ..backend.asset import AssetType
@@ -73,6 +75,14 @@ def setup_environment_cache(ctx, param, value):
             dump_environments(environments)
 
 
+def check_prefix(prefix_path):
+    """Check that the prefix is usable"""
+
+    folder_status, _ = check_prefix_folders(prefix_path)
+    dataformat_status, _ = check_prefix_dataformats(prefix_path)
+    return folder_status and dataformat_status
+
+
 refresh_environment_cache_flag = click.option(
     "--no-check-env",
     is_flag=True,
@@ -130,6 +140,11 @@ def start(ctx):
     """Start the beat editor"""
 
     app = QApplication(sys.argv)
+
+    config = ctx.meta["config"]
+    if not check_prefix(config.prefix):
+        return
+
     app.installEventFilter(MouseWheelFilter(app))
     mainwindow = MainWindow()
     mainwindow.set_context(ctx)