can route actions through user-defined formulas, eg "sin(x*pi)"

plugins/ManipulatePlugin.py

@@ -1,5 +1,19 @@
 import data_centre.plugin_collection
 from data_centre.plugin_collection import ActionsPlugin#, SequencePlugin
+#import math
+from math import sin, cos, tan, log, exp, pi
+
+"""
+add to midi or osc mapping
+use |f: : to bookend your formula
+
+eg
+
+    "control_change 48": {
+            "DEFAULT": ["set_the_shader_param_0_layer_offset_0_continuous|invert|f:sin(x*pi):&&print_arguments","set_strobe_amount_continuous"],
+            "NAV_DETOUR": ["set_detour_speed_position_continuous"]
+    },
+"""
 
 class ManipulatePlugin(ActionsPlugin):
     disabled = False
@@ -10,9 +24,13 @@ class ManipulatePlugin(ActionsPlugin):
     @property
     def parserlist(self):
         return [ 
-                ( r"(.*)\|invert$", self.invert ),
+                ( r"^(.*)\|invert$", self.invert ),
+                ( r"^(.*)\|f:(.*):$", self.formula ),
+                ( r"^set_variable_([a-zA-Z0-9]+)$", self.set_variable )
         ]
 
+    variables = {}
+
     def invert(self, action, value):
         # invert the value
         self.pc.actions.call_method_name(
@@ -20,3 +38,16 @@ class ManipulatePlugin(ActionsPlugin):
                 # if you were calling an action with no argument, use eg:
                 # "toggle_automation_pause", None
         )
+
+    def formula(self, action, formula, value):
+        self.variables['x'] = value
+        print("evaluating formula `%s` with value `%s`" % (formula, value))
+        value = eval(formula, globals(), self.variables)
+        print("got evaluated value `%s`" % value)
+
+        self.pc.actions.call_method_name(
+                action, value
+        )
+
+    def set_variable(self, var_name, value):
+        self.variables[var_name] = value