menu: add ability for enable to hide certain menus

docs/Configuration.md

@@ -32,9 +32,16 @@ panel: preheat
 method: printer.gcode.script
 # Parameters that would be passed with the method above
 params: {"script":"G28 X"}
+# Enable allows hiding of a menu if the condition is false. This statement is evaluated in Jinja2
+#   Available variables are listed below.
+enable: {{ printer.power_devices.count > 0 }}
 ```
 Available panels are listed here: [docs/panels.md](panels.md)
 
+Certain variables are available for conditional testing of the enable statement:
+```
+printer.power_devices.count # Number of power devices configured in Moonraker
+```
 
 
 A sample configuration of a main menu would be as follows:

docs/changelog.md

@@ -1,9 +1,12 @@
 ## Changelog
 
+#### 2020 11 28
+* Add option for enable in menu for configuration. This can hide certain options
+
 #### 2020 11 18
-* Changed configuration file format. 
-* Moved default configuration file to an include folder. 
-* Added ability to do a confirm dialog from a menu item when running a script 
+* Changed configuration file format.
+* Moved default configuration file to an include folder.
+* Added ability to do a confirm dialog from a menu item when running a script
 * Added "Save Config" button to default configuration's Configuration menu.
 
 #### 2020 11 14

panels/menu.py

@@ -7,6 +7,8 @@ from gi.repository import Gtk, Gdk, GLib
 from ks_includes.KlippyGtk import KlippyGtk
 from ks_includes.screen_panel import ScreenPanel
 
+from jinja2 import Template
+
 logger = logging.getLogger("KlipperScreen.MenuPanel")
 
 def create_panel(*args):
@@ -16,6 +18,7 @@ class MenuPanel(ScreenPanel):
     def initialize(self, panel_name, items):
         _ = self.lang.gettext
 
+        self.activate()
         grid = self.arrangeMenuItems(items, 4)
 
         b = KlippyGtk.ButtonImage('back', _('Back'))
@@ -24,10 +27,26 @@ class MenuPanel(ScreenPanel):
 
         self.panel = grid
 
+    def activate(self):
+        self.j2_data = {
+            "printer": {
+                "power_devices": {
+                    "count": len(self._screen.printer.get_power_devices())
+                }
+            }
+        }
+        logger.debug("j2_data: %s" % self.j2_data)
+
     def arrangeMenuItems (self, items, columns, expandLast=False):
         grid = Gtk.Grid()
         grid.set_row_homogeneous(True)
         grid.set_column_homogeneous(True)
+        logger.debug(items)
+        for item in items:
+            key = list(item)[0]
+            logger.debug(item)
+            if not self.evaluate_enable(item[key]['enable']):
+                items.remove(item)
 
         l = len(items)
         i = 0
@@ -60,3 +79,22 @@ class MenuPanel(ScreenPanel):
             i += 1
 
         return grid
+
+    def evaluate_enable(self, enable):
+        if enable == True:
+            return True
+        if enable == False:
+            return False
+
+        try:
+            logger.debug("Template: '%s'" % enable)
+            logger.debug("Date: %s" % self.j2_data)
+            j2_temp = Template(enable)
+            result = j2_temp.render(self.j2_data)
+            logger.debug("Result: %s" % result)
+            if result == 'True':
+                return True
+            return False
+        except:
+            logger.debug("Error evaluating enable statement: %s", enable)
+            return False

scripts/KlipperScreen-requirements.txt

@@ -3,3 +3,4 @@ requests==2.25.0
 vext==0.7.4
 websocket-client==0.57.0
 humanize==3.1.0
+jinja2==2.11.2