Improved logging documentation.

linkcheck/logger/__init__.py

@@ -124,7 +124,7 @@ class Logger (object):
     Base class for logging of checked urls. It defines the public API
     (see below) and offers basic functionality for all loggers.
 
-    Each logger has to offer the following functions:
+    Each logger offers the following functions:
 
     * start_output()
         Initialize and start log output. Most loggers print a comment
@@ -136,6 +136,15 @@ class Logger (object):
         Log a checked URL. The url_data object is a transport form of
         the UrlData class. The do_print flag indicates if this URL
         should be logged or just used to update internal statistics.
+
+    Each subclassed logger must implement the following functions:
+
+    * start_output()
+        Also call the base class implementation of this.
+    * end_output()
+        See above.
+    * log_url(url_data)
+        Log a checked URL. Called by log_filter_url if do_print is True.
     """
 
     def __init__ (self, **args):

linkcheck/logger/text.py

@@ -26,31 +26,6 @@ class TextLogger (Logger):
     """
     A text logger, colorizing the output if possible.
 
-    Every Logger has to implement the following functions:
-
-    C{def start_output (self)}
-    Called once to initialize the Logger. Why do we not use __init__(self)?
-    Because we initialize the start time in start_output and __init__ gets
-    not called at the time the checking starts but when the logger object is
-    created.
-    Another reason is that we might want to create several loggers
-    as a default and then switch to another configured output. So we
-    must not print anything out at __init__ time.
-
-    C{def log_filter_url (self, url_data, do_print)}
-    Called every time an url finished checking. All data we checked is in
-    the UrlData object url_data.
-
-    C{def end_output (self)}
-    Called at the end of checking to close filehandles and such.
-
-    Passing parameters to the constructor:
-
-    C{def __init__ (self, **args)}
-    The args dictionary is filled in Config.py. There you can specify
-    default parameters. Adjust these parameters in the configuration
-    files in the appropriate logger section.
-
     Informal text output format spec:
     Output consists of a set of URL logs separated by one or more
     blank lines.

linkcheck/logger/xmllog.py

@@ -45,7 +45,7 @@ def xmlquoteattr (s):
 
 
 class XMLLogger (Logger):
-    """XML output; easy to parse with any XML tool."""
+    """Base class for XML output; easy to parse with any XML tool."""
 
     def __init__ (self, **args):
         """