implement input for custom waterfall colors

owrx/controllers/settings/general.py

@@ -9,6 +9,7 @@ from owrx.form import (
     DropdownInput,
     Option,
 )
+from owrx.form.converter import WaterfallColorsConverter
 from owrx.form.receiverid import ReceiverKeysConverter
 from owrx.form.gfx import AvatarInput, TopPhotoInput
 from owrx.waterfall import WaterfallOptions
@@ -80,6 +81,12 @@ class GeneralSettingsController(SettingsFormController):
                     "Waterfall color scheme",
                     options=WaterfallOptions,
                 ),
+                TextAreaInput(
+                    "waterfall_colors",
+                    "Custom waterfall colors",
+                    infotext="TODO: describe",
+                    converter=WaterfallColorsConverter()
+                ),
                 NumberInput(
                     "fft_fps",
                     "FFT speed",

owrx/form/converter.py

@@ -66,3 +66,20 @@ class JsonConverter(Converter):
 
     def convert_from_form(self, value):
         return json.loads(value)
+
+
+class WaterfallColorsConverter(Converter):
+    def convert_to_form(self, value):
+        if value is None:
+            return ""
+        return "\n".join("#{:06x}".format(v) for v in value)
+
+    def convert_from_form(self, value):
+        def parseString(s):
+            if s.startswith("#"):
+                return int(s[1:], 16)
+            # int() with base 0 can accept "0x" prefixed hex strings, or int numbers
+            return int(s, 0)
+
+        # \r\n or \n? this should work with both.
+        return [parseString(v.strip("\r ")) for v in value.split("\n")]