waterfall config fine-adjustments

* hide the waterfall colors input when pre-defined color scheme is
  selected
* skip unparseable lines on custom color input
* fallback to black and white if custom color config is unusable
* always use the waterfall classes when sending changes to the client

htdocs/lib/settings/WaterfallDropdown.js

@@ -0,0 +1,11 @@
+$.fn.waterfallDropdown = function(){
+    this.each(function(){
+        var $select = $(this);
+        var setVisibility = function() {
+            var show = $select.val() === 'CUSTOM';
+            $('#waterfall_colors').parents('.form-group')[show ? 'show' : 'hide']();
+        }
+        $select.on('change', setVisibility);
+        setVisibility();
+    })
+}

htdocs/settings.js

@@ -4,4 +4,5 @@ $(function(){
     $('.imageupload').imageUpload();
     $('.bookmarks').bookmarktable();
     $('.wsjt-decoding-depths').wsjtDecodingDepthsInput();
+    $('#waterfall_scheme').waterfallDropdown();
 });

owrx/connection.py

@@ -207,8 +207,8 @@ class OpenWebRxReceiverClient(OpenWebRxClient, SdrSourceEventClient):
         def writeConfig(changes):
             # TODO it would be nicer to have all options available and switchable in the client
             # this restores the existing functionality for now, but there is lots of potential
-            if "waterfall_scheme" in changes:
+            if "waterfall_scheme" in changes or "waterfall_colors" in changes:
-                scheme = WaterfallOptions(changes["waterfall_scheme"]).instantiate()
+                scheme = WaterfallOptions(globalConfig["waterfall_scheme"]).instantiate()
                 changes["waterfall_colors"] = scheme.getColors()
             self.write_config(changes)
 

owrx/controllers/assets.py

@@ -151,6 +151,7 @@ class CompiledAssetsController(GzipMixin, ModificationAwareController):
             "lib/settings/ImageUpload.js",
             "lib/settings/BookmarkTable.js",
             "lib/settings/WsjtDecodingDepthsInput.js",
+            "lib/settings/WaterfallDropdown.js",
             "settings.js",
         ],
     }

owrx/form/converter.py

@@ -76,10 +76,14 @@ class WaterfallColorsConverter(Converter):
 
     def convert_from_form(self, value):
         def parseString(s):
+            try:
                 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)
+            except ValueError:
+                return None
 
         # \r\n or \n? this should work with both.
-        return [parseString(v.strip("\r ")) for v in value.split("\n")]
+        values = [parseString(v.strip("\r ")) for v in value.split("\n")]
+        return [v for v in values if v is not None]

owrx/waterfall.py

@@ -287,7 +287,12 @@ class Ha7ilmWaterfall(Waterfall):
 class CustomWaterfall(Waterfall):
     def __init__(self):
         config = Config.get()
-        super().__init__(config["waterfall_colors"])
+        if "waterfall_colors" in config and config["waterfall_colors"]:
+            colors = config["waterfall_colors"]
+        else:
+            # fallback: black and white
+            colors = [0x000000, 0xffffff]
+        super().__init__(colors)
 
 
 class WaterfallOptions(DropdownEnum):