[core] restructure to allow PIP packaging

OK - so I have to admit I *hate* the fact that PIP seems to require a
subdirectory named like the library.

But since the PIP package is something really nifty to have (thanks to
@tony again!!!), I updated the codebase to hopefully conform with what
PIP expects. Testruns so far look promising...

bumblebee_status/core/decorators.py

@@ -0,0 +1,67 @@
+import util.format
+
+
+def never(init):
+    def call_init(obj, *args, **kwargs):
+        init(obj, *args, **kwargs)
+        if obj.parameter("interval") is None:
+            obj.set("interval", "never")
+
+    return call_init
+
+
+def every(hours=0, minutes=0, seconds=0):
+    def decorator_init(init):
+        def call_init(obj, *args, **kwargs):
+            init(obj, *args, **kwargs)
+            if obj.parameter("interval") is None:
+                obj.set("interval", hours * 3600 + minutes * 60 + seconds)
+
+        return call_init
+
+    return decorator_init
+
+
+def scrollable(func):
+    def wrapper(module, widget):
+        text = func(module, widget)
+        if not text:
+            return text
+
+        if text != widget.get("__content__", text):
+            widget.set("scrolling.start", 0)
+            widget.set("scrolling.direction", "right")
+        widget.set("__content__", text)
+
+        width = util.format.asint(module.parameter("scrolling.width", 30))
+        if util.format.asbool(module.parameter("scrolling.makewide", True)):
+            widget.set("theme.minwidth", "A" * width)
+        if width < 0 or len(text) <= width:
+            return text
+
+        start = widget.get("scrolling.start", 0)
+        bounce = util.format.asbool(module.parameter("scrolling.bounce", True))
+        scroll_speed = util.format.asint(module.parameter("scrolling.speed", 1))
+        direction = widget.get("scrolling.direction", "right")
+
+        if direction == "left":
+            scroll_speed = -scroll_speed
+            if start + scroll_speed <= 0:  # bounce back
+                widget.set("scrolling.direction", "right")
+
+        next_start = start + scroll_speed
+        if next_start + width > len(text):
+            if not bounce:
+                next_start = 0
+            else:
+                next_start = start - scroll_speed
+                widget.set("scrolling.direction", "left")
+
+        widget.set("scrolling.start", next_start)
+
+        return text[start : start + width]
+
+    return wrapper
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4