[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/modules/contrib/apt.py

@@ -0,0 +1,89 @@
+# pylint: disable=C0111,R0903
+
+"""Displays APT package update information (<to upgrade>/<to remove >)
+Requires the following packages:
+
+    * aptitude
+
+contributed by `qba10 <https://github.com/qba10>`_ - many thanks!
+"""
+
+import re
+import threading
+
+import core.module
+import core.widget
+import core.decorators
+
+import util.cli
+
+PATTERN = "{} packages upgraded, {} newly installed, {} to remove and {} not upgraded."
+
+
+def parse_result(to_parse):
+    # We want to line with the iforamtion about package upgrade
+    line_to_parse = to_parse.split("\n")[-4]
+    result = re.search(
+        "(.+) packages upgraded, (.+) newly installed, (.+) to remove", line_to_parse
+    )
+
+    return int(result.group(1)), int(result.group(3))
+
+
+def get_apt_check_info(module):
+    widget = module.widget()
+    try:
+        res = util.cli.execute("aptitude full-upgrade --simulate --assume-yes")
+        widget.set("error", None)
+    except (RuntimeError, FileNotFoundError) as e:
+        widget.set("error", "unable to query APT: {}".format(e))
+        return
+
+    to_upgrade = 0
+    to_remove = 0
+    try:
+        to_upgrade, to_remove = parse_result(res)
+        widget.set("to_upgrade", to_upgrade)
+        widget.set("to_remove", to_remove)
+    except Exception as e:
+        widget.set("error", "parse error: {}".format(e))
+
+    core.event.trigger("update", [module.id], redraw_only=True)
+
+
+class Module(core.module.Module):
+    @core.decorators.every(minutes=30)
+    def __init__(self, config, theme):
+        super().__init__(config, theme, core.widget.Widget(self.updates))
+        self.__thread = None
+
+    def updates(self, widget):
+        if widget.get("error"):
+            return widget.get("error")
+        return "{} to upgrade, {} to remove".format(
+            widget.get("to_upgrade", 0), widget.get("to_remove", 0)
+        )
+
+    def update(self):
+        if self.__thread and self.__thread.isAlive():
+            return
+
+        self.__thread = threading.Thread(target=get_apt_check_info, args=(self,))
+        self.__thread.start()
+
+    def state(self, widget):
+        cnt = 0
+        ret = "good"
+        for t in ["to_upgrade", "to_remove"]:
+            cnt += widget.get(t, 0)
+        if cnt > 50:
+            ret = "critical"
+        elif cnt > 0:
+            ret = "warning"
+        if widget.get("error"):
+            ret = "critical"
+
+        return ret
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4