[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/pihole.py

@@ -0,0 +1,85 @@
+# pylint: disable=C0111,R0903
+
+"""Displays the pi-hole status (up/down) together with the number of ads that were blocked today
+
+Parameters:
+    * pihole.address     : pi-hole address (e.q: http://192.168.1.3)
+    * pihole.pwhash      : pi-hole webinterface password hash (can be obtained from the /etc/pihole/SetupVars.conf file)
+
+contributed by `bbernhard <https://github.com/bbernhard>`_ - many thanks!
+"""
+
+import requests
+
+import core.module
+import core.widget
+import core.input
+
+
+class Module(core.module.Module):
+    @core.decorators.every(minutes=1)
+    def __init__(self, config, theme):
+        super().__init__(config, theme, core.widget.Widget(self.pihole_status))
+
+        self._pihole_address = self.parameter("address", "")
+        self._pihole_pw_hash = self.parameter("pwhash", "")
+        self._pihole_status = None
+        self._ads_blocked_today = "-"
+        self.update_pihole_status()
+
+        core.input.register(
+            self, button=core.input.LEFT_MOUSE, cmd=self.toggle_pihole_status
+        )
+
+    def pihole_status(self, widget):
+        if self._pihole_status is None:
+            return "pi-hole unknown"
+        return "pi-hole {}".format(
+            "up {} blocked".format(self._ads_blocked_today)
+            if self._pihole_status
+            else "down"
+        )
+
+    def update_pihole_status(self):
+        try:
+            data = requests.get(self._pihole_address + "/admin/api.php?summary").json()
+            self._pihole_status = True if data["status"] == "enabled" else False
+            self._ads_blocked_today = data["ads_blocked_today"]
+        except Exception as e:
+            self._pihole_status = None
+
+    def toggle_pihole_status(self, widget):
+        if self._pihole_status is not None:
+            try:
+                req = None
+                if self._pihole_status:
+                    req = requests.get(
+                        self._pihole_address
+                        + "/admin/api.php?disable&auth="
+                        + self._pihole_pw_hash
+                    )
+                else:
+                    req = requests.get(
+                        self._pihole_address
+                        + "/admin/api.php?enable&auth="
+                        + self._pihole_pw_hash
+                    )
+                if req is not None:
+                    if req.status_code == 200:
+                        status = req.json()["status"]
+                        self._pihole_status = False if status == "disabled" else True
+            except:
+                pass
+
+    def update(self):
+        self.update_pihole_status()
+
+    def state(self, widget):
+        if self._pihole_status is None:
+            return []
+        elif self._pihole_status:
+            return ["enabled"]
+        return ["disabled", "warning"]
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4