[modules] add a module "keys" that shows whether a key is pressed

also, add backend functionality to hide individual widgets of a module.

bumblebee_status/core/module.py

@@ -190,9 +190,9 @@ class Module(core.input.Object):
     :rtype: bumblebee_status.widget.Widget
     """
 
-    def add_widget(self, full_text="", name=None):
+    def add_widget(self, full_text="", name=None, hidden=False):
         widget_id = "{}::{}".format(self.name, len(self.widgets()))
-        widget = core.widget.Widget(full_text=full_text, name=name, widget_id=widget_id)
+        widget = core.widget.Widget(full_text=full_text, name=name, widget_id=widget_id, hidden=hidden)
         self.widgets().append(widget)
         widget.module = self
         return widget

bumblebee_status/core/output.py

@@ -216,6 +216,8 @@ class i3(object):
                     continue
             if module.hidden():
                 continue
+            if widget.hidden:
+                continue
             if "critical" in widget.state() and self.__config.errorhide(widget.module.name):
                 continue
             blocks.extend(self.separator_block(module, widget))

bumblebee_status/core/widget.py

@@ -10,12 +10,13 @@ log = logging.getLogger(__name__)
 
 
 class Widget(util.store.Store, core.input.Object):
-    def __init__(self, full_text="", name=None, widget_id=None):
+    def __init__(self, full_text="", name=None, widget_id=None, hidden=False):
         super(Widget, self).__init__()
         self.__full_text = full_text
         self.module = None
         self.name = name
         self.id = widget_id or self.id
+        self.hidden = hidden
 
     @property
     def module(self):

themes/gruvbox-powerline.json

@@ -68,5 +68,20 @@
 			"fg": "#002b36",
 			"bg": "#859900"
 		}
+	},
+	"keys": {
+		"Key.cmd": {
+			"bg": "#8ec07c",
+			"full_text": "***"
+		},
+		"Key.shift": {
+			"bg": "#fabd2f"
+		},
+		"Key.ctrl": {
+			"bg": "#83a598"
+		},
+		"Key.alt": {
+			"bg": "#f28019"
+		}
 	}
 }