Add simple portage status module.

This adds a simple module to display the status of Gentoo portage
operations by reading its logfile.

bumblebee_status/modules/contrib/portage_status.py

@@ -0,0 +1,64 @@
+"""Displays the status of Gentoo portage operations.
+
+Parameters:
+    * portage_status.logfile: logfile for portage (default is /var/log/emerge.log)
+"""
+
+import os
+
+import core.module
+import core.widget
+
+
+class Module(core.module.Module):
+    def __init__(self, config, theme):
+        super().__init__(config, theme, core.widget.Widget(self.output))
+        self.__logfile = self.parameter(
+            "logfile", "/var/log/emerge.log")
+        self.clear()
+
+
+    def clear(self):
+        self.__action = ""
+        self.__package = ""
+        self.__status = ""
+
+
+    def output(self, widget):
+        return " ".join([atom for atom in
+                         (self.__action, self.__package, self.__status) if atom != ""])
+
+
+    def state(self, widgets):
+        if self.__action == "":
+            return "idle"
+        return "active"
+
+
+    def update(self):
+        try:
+            with open(self.__logfile, "rb") as f:
+                f.seek(-2, os.SEEK_END)
+                while f.read(1) != b"\n":
+                    f.seek(-2, os.SEEK_CUR)
+                last_line = f.readline().decode()
+                if "===" in last_line:
+                    if "Unmerging..." in last_line:
+                        self.__action = "Unmerging"
+                        package_beg = last_line.find("(") + 1
+                        package_end = last_line.find("-", last_line.find("/")) - 1
+                        self.__package = last_line[package_beg:package_end+1]
+                    else: # merging
+                        status_beg = last_line.find("(")
+                        status_end = last_line.find(")")
+                        self.__status = last_line[status_beg:status_end+1]
+                        package_beg = last_line.find('(', status_end) + 1
+                        package_end = package_beg + last_line[package_beg:].find("-", last_line[package_beg:].find("/")) - 1
+                        self.__package = last_line[package_beg:package_end+1]
+                        action_beg = status_end + 2
+                        action_end = package_beg - 3
+                        self.__action = last_line[action_beg:action_end+1]
+                else:
+                    self.clear()
+        except Exception:
+            self.clear()

themes/icons/awesome-fonts.json

@@ -35,6 +35,10 @@
     "empty": { "prefix": "\uf0e0" },
     "items": { "prefix": "\uf0e0" }
   },
+  "portage_status": {
+    "idle": { "prefix": "" },
+    "active": { "prefix": "" }
+  },
   "todo": {
     "empty": { "prefix": "" },
     "items": { "prefix": "" },