[core/theme] Add prefix/postfix methods

Add a way to specify prefix and postfix strings to the full text of a
widget's text. Currently, the theme does not fill those yet.

see #23

bumblebee/config.py

@@ -7,12 +7,14 @@ module parameters, etc.) to all other components
 import argparse
 
 MODULE_HELP = ""
+THEME_HELP = ""
 
 def create_parser():
     """Create the argument parser"""
     parser = argparse.ArgumentParser(description="display system data in the i3bar")
     parser.add_argument("-m", "--modules", nargs="+", default=[],
-                        help=MODULE_HELP)
+        help=MODULE_HELP)
+    parser.add_argument("-t", "--theme", default="default", help=THEME_HELP)
     return parser
 
 class Config(object):
@@ -32,4 +34,8 @@ class Config(object):
             "name": x if not ":" in x else x.split(":")[1],
         } for x in self._args.modules]
 
+    def theme(self):
+        """Return the name of the selected theme"""
+        return self._args.theme
+
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

bumblebee/output.py

@@ -19,8 +19,8 @@ class Widget(object):
 
 class I3BarOutput(object):
     """Manage output according to the i3bar protocol"""
-    def __init__(self):
-        pass
+    def __init__(self, theme):
+        self._theme = theme
 
     def start(self):
         """Print start preamble for i3bar protocol"""
@@ -32,8 +32,13 @@ class I3BarOutput(object):
 
     def draw_widget(self, result, widget):
         """Draw a single widget"""
+        full_text = widget.full_text()
+        if self._theme.prefix():
+            full_text = "{}{}".format(self._theme.prefix(), full_text)
+        if self._theme.suffix():
+            full_text = "{}{}".format(full_text, self._theme.suffix())
         result.append({
-            u"full_text": widget.full_text()
+            u"full_text": "{}".format(full_text)
         })
 
     def draw(self, widgets, engine=None):

bumblebee/theme.py

@@ -14,6 +14,14 @@ class Theme(object):
     def __init__(self, name):
         self._theme = self.load(name)
 
+    def prefix(self):
+        """Return the theme prefix for a widget's full text"""
+        return None
+
+    def suffix(self):
+        """Return the theme suffix for a widget's full text"""
+        return None
+
     def load(self, name):
         """Load and parse a theme file"""
         path = theme_path()