Improve warnings

Add warnings for when indices are not continuous from 0

slicer_cli_web/ctk_cli_adjustment.py

@@ -114,7 +114,7 @@ def parse(cls, elementTree):  # noqa
         if self.index is not None:
             self.index = int(self.index)
 
-        if self.default:
+        if self.default is not None:
             try:
                 self.default = self.parseValue(self.default)
             except ValueError as e:
@@ -124,7 +124,7 @@ def parse(cls, elementTree):  # noqa
                 not self.isVector() and not self.isExternalType() and
                 self.channel != 'output'):
             ctk_cli.module.logger.warning(
-                'No <default> provided for element of type <%s>', self.typ)
+                'No <default> provided for element of type <%s> (%s)', self.typ, self.name)
 
         if self.typ.endswith('-enumeration'):
             try:
@@ -158,6 +158,26 @@ def _ctkCliParse(cls, elementTree):  # noqa
 
 ctk_cli.module.CLIParameters.parse = _ctkCliParse
 
+_orig_CLIModule_init = ctk_cli.CLIModule.__init__
+
+
+def _CLIModule_init(self, path=None, env=None, stream=None):
+    ret = _orig_CLIModule_init(self, path, env, stream)
+    indices = set()
+    for param in self.parameters():
+        if param.index is not None:
+            idx = int(param.index)
+            if idx in indices:
+                ctk_cli.module.logger.warning('Parameter index %d used multiple times', idx)
+            indices.add(idx)
+    if len(indices) and (min(indices) < 0 or max(indices) >= len(indices)):
+        ctk_cli.module.logger.warning('Parameter indices are not continuous from 0 upwards')
+
+    return ret
+
+
+ctk_cli.CLIModule.__init__ = _CLIModule_init
 CLIModule = ctk_cli.CLIModule
 
+
 __all__ = ['CLIModule']