Fix Meta modules and add inputs to ndvi-colormap (#1432)

* fix meta module bug

* fix create meta module and add inputs to ndvi-colormap

Co-authored-by: Harsh Khandeparkar <34770591+HarshKhandeparkar@users.noreply.github.com>
Co-authored-by: Jeffrey Warren <jeff@unterbahn.com>

src/modules/NdviColormap/info.json

@@ -1,6 +1,24 @@
 {
     "name": "ndvi-colormap",
     "description": "Sequentially Applies NDVI and Colormap steps",
-    "inputs": {},
+    "inputs": {
+        "filter": {
+            "type": "select",
+            "desc": "Filter color",
+            "default": "red",
+            "values": ["red", "blue"]
+          },
+        "colormap": {
+            "type": "select",
+            "desc": "Name of the Colormap",
+            "default": "default",
+            "values": [
+                "default",
+                "greyscale",
+                "stretched",
+                "fastie"
+            ]
+        }
+    },
     "docs-link": "https://github.com/publiclab/image-sequencer/blob/main/docs/MODULES.md#ndvi-colormap-module"
 }

src/util/createMetaModule.js

@@ -16,11 +16,6 @@ module.exports = function createMetaModule(mapFunction, moduleOptions) {
       }
     }
 
-    // map inputs to internal step options;
-    // use this to set defaults for internal steps
-    // and to expose internal settings as external meta-module parameters;
-    // it must return a steps object
-    var steps = mapFunction(options);
 
     /* example:
     function mapFunction(opt, _defaults) {
@@ -40,7 +35,13 @@ module.exports = function createMetaModule(mapFunction, moduleOptions) {
     function draw(input, callback) {
 
       var step = this;
-
+
+      // map inputs to internal step options;
+      // use this to set defaults for internal steps
+      // and to expose internal settings as external meta-module parameters;
+      // it must return a steps object
+      var steps = mapFunction(options);
+
       var internalSequencer = ImageSequencer({ inBrowser: false, ui: false });
       internalSequencer.loadImage(input.src, function onAddImage() {
         internalSequencer.importJSON(steps);