Fine tune implementation

- `inc_verbosity()` moved to the LoggerAdapter
- Fix a couple of bugs
- Fix coding style issues

Author: Vasileios Karakasis

reframe/core/logging.py

@@ -363,12 +363,12 @@ def setLevel(self, level):
             super().setLevel(level)
 
     @property
-    def stream_handlers(self):
+    def std_stream_handlers(self):
         if self.logger:
             return [h for h in self.logger.handlers
-                if (isinstance(h, logging.StreamHandler) and
-                    not isinstance(h, logging.FileHandler))]
-        return []
+                    if h.stream == sys.stdout or h.stream == sys.stderr]
+        else:
+            return []
 
     def _update_check_extras(self):
         """Return a dictionary with all the check-specific information."""
@@ -439,6 +439,18 @@ def error(self, message, *args, **kwargs):
 
         super().error(message, *args, **kwargs)
 
+    def inc_verbosity(self, num_steps):
+        """Convenience function for increasing the verbosity
+        of the logger step-wise."""
+        log_levels = sorted(_log_level_names.keys())[1:]
+        for h in self.std_stream_handlers:
+            level_idx = log_levels.index(h.level)
+            if level_idx - num_steps < 0:
+                new_level = log_levels[0]
+            else:
+                new_level = log_levels[level_idx - num_steps]
+
+            h.setLevel(new_level)
 
 
 # A logger that doesn't log anything

reframe/frontend/printer.py

@@ -20,17 +20,6 @@ def __init__(self):
         self.line_width = 78
         self.status_width = 10
 
-    def inc_verbosity(self, num_steps):
-        log_levels = sorted(logging._log_level_names.keys())[1:] # [1:] to exclude level NOTSET
-        for h in self.stream_handlers:
-            level_idx = log_levels.index(h.level)
-            try:
-                new_level = log_levels[level_idx - num_steps]
-            except IndexError:
-                new_level = 0
-
-            h.setLevel(new_level)
-
     def separator(self, linestyle, msg=''):
         if linestyle == 'short double line':
             line = self.status_width * '='