systemd: new module from scratch

[lasers]

This addresses the issues in (2) systemd pull requests.

• Replaces systemd: add config parameter to hide service extension #1381, Hide service extension.
  • We replace boolean config with the format.
  • Single format for full customization. Colors included.
  • Allow more things to happen in the future (ie formatters).
  • Users can specify: SSH, ssh, sshd, [sshd], OpenSSH etc.
• Replaces systemd: Suppress output if unit is in default state #1382, Suppress output if unit is in default state.
  • We replace string config with the format.
  • Single format for full customization. Colors included.
  • Allow more things to happen in the future (ie formatters).
  • Format allows us to do more than (4) hide_if_default options.
  • More than 50+ placeholders. Not all of them will be supported or usable.

This is also here because @tobes puts out a dbus helper for modules.

• If he want to, he can use this PR with a diff below to help himself making a better dbus helper... for systemd without cache_timeout and other modules. Note: The diff seems identical to the Upower one, but it does not work. I acknowledge it is not finished. Cheers.

diff --git a/py3status/modules/systemd.py b/py3status/modules/systemd.py
index caa2bde7..dfbcb53f 100644
--- a/py3status/modules/systemd.py
+++ b/py3status/modules/systemd.py
@@ -3,7 +3,6 @@
 Display systemd1 unit properties of a service.
 
 Configuration parameters:
-    cache_timeout: refresh interval for this module (default 5)
     format: display format for this module
         *(default '{Id} [\?if=LoadState=not-found&color=degraded '
         '{LoadState}|[\?color=ActiveState {ActiveState}]]')*
@@ -120,7 +119,6 @@ class Py3status:
     """
 
     # available configuration parameters
-    cache_timeout = 5
     format = (
         "{Id} [\?if=LoadState=not-found&color=degraded {LoadState}"
         "|[\?color=ActiveState {ActiveState}]]"
@@ -148,6 +146,7 @@ class Py3status:
         manager = dbus.Interface(systemd, dbus_interface=MANAGER)
         proxy = bus.get_object(SYSTEMD1, manager.LoadUnit(self.unit))
         self.systemd_unit = dbus.Interface(proxy, dbus_interface=UNIT)
+        self.py3.dbus_subscribe(".systemd1", "update")
 
     def systemd(self):
         systemd_data = self.systemd_unit.GetAll(UNIT, dbus_interface=PROP)
@@ -162,7 +161,7 @@ class Py3status:
                 self.py3.threshold_get_color(systemd_data[x], x)
 
         return {
-            "cached_until": self.py3.time_in(self.cache_timeout),
+            "cached_until": self.py3.time_in(self.py3.CACHE_FOREVER),
             "full_text": self.py3.safe_format(self.format, systemd_data),
         }
 

[ultrabug]

Too much format magic, this is not the way forward, closing for simpler implementations