LP: #975692 phase 1

 * Rework list style management.  No more style priorities or matching..  Now,
   you name a style explicitly to apply and that's it.
 * create_list() now takes a `style` argument.
 * config file now names both a default style to use, and a set of paths to
   scan for IStyle instances.  (This could be a model for other plugins.)
 * added IMailingList.style_name to record the last style applied, but this is
   going to be removed in subsequent revisions.

Also:
 * Move find_components() and scan_module() from app/finder.py to
   utilities/modules.py
 * Cleaned up lifecycle.rst for better documentation.  Some tests moved to
   test_lifecycle.py.
 * Remove some unnecessary test tearDown() code.

2 files changed, 11 insertions, 40 deletions

diff --git a/src/mailman/interfaces/mailinglist.py b/src/mailman/interfaces/mailinglist.py
index 8a4436a21..798680782 100644
--- a/src/mailman/interfaces/mailinglist.py
+++ b/src/mailman/interfaces/mailinglist.py
@@ -132,6 +132,9 @@ class IMailingList(Interface):
         """Advertise this mailing list when people ask for an overview of the
         available mailing lists.""")
 
+    style_name = Attribute(
+        """The name of the last style applied, or None.""")
+
     # Contact addresses
 
     posting_address = Attribute(
diff --git a/src/mailman/interfaces/styles.py b/src/mailman/interfaces/styles.py
index 8dfd52145..4a7b69dcb 100644
--- a/src/mailman/interfaces/styles.py
+++ b/src/mailman/interfaces/styles.py
@@ -43,9 +43,6 @@ class IStyle(Interface):
     name = Attribute(
         """The name of this style.  Must be unique.""")
 
-    priority = Attribute(
-        """The priority of this style, as an integer.""")
-
     def apply(mailing_list):
         """Apply the style to the mailing list.
 
@@ -53,50 +50,28 @@ class IStyle(Interface):
         :param mailing_list: the mailing list to apply the style to.
         """
 
-    def match(mailing_list, styles):
-        """Give this style a chance to match the mailing list.
-
-        If the style's internal matching rules match the `mailing_list`, then
-        the style may append itself to the `styles` list.  This list will be
-        ordered when returned from `IStyleManager.lookup()`.
-
-        :type mailing_list: `IMailingList`.
-        :param mailing_list: the mailing list object.
-        :param styles: ordered list of `IStyles` matched so far.
-        """
-
-
 
 class IStyleManager(Interface):
-    """A manager of styles and style chains."""
+    """A manager of styles."""
 
     def get(name):
         """Return the named style or None.
 
-        :type name: Unicode
+        :type name: string
         :param name: A style name.
         :return: the named `IStyle` or None if the style doesn't exist.
         """
 
-    def lookup(mailing_list):
-        """Return a list of styles for the given mailing list.
-
-        Use various registered rules to find an `IStyle` for the given mailing
-        list.  The returned styles are ordered by their priority.
+    styles = Attribute(
+        'An iterator over all the styles known by this manager.')
 
-        Style matches can be registered and reordered by plugins.
+    def populate():
+        """Populate the styles from the configuration files.
 
-        :type mailing_list: `IMailingList`.
-        :param mailing_list: The mailing list object to find a style for.
-        :return: ordered list of `IStyles`.  Zero is the lowest priority.
+        This clears the current set of styles and resets them from those
+        defined in the configuration files.
         """
 
-    styles = Attribute(
-        """An iterator over all the styles known by this manager.
-
-        Styles are ordered by their priority, which may be changed.
-        """)
-
     def register(style):
         """Register a style with this manager.
 
@@ -111,10 +86,3 @@ class IStyleManager(Interface):
         :param style: an IStyle.
         :raises KeyError: If the style's name is not currently registered.
         """
-
-    def populate():
-        """Populate the styles from the configuration files.
-
-        This clears the current set of styles and resets them from those
-        defined in the configuration files.
-        """