Add reverse option to index seed.

Part #46.

README.md

@@ -599,6 +599,7 @@ If the item is not found, will return null.
 Required parameters
 - `container` - The string, object, or array to search within.
 - `search` - The thing to find within the container.
+- `reverse` - (optional) a boolean of whether to search from back to front. Defaults to false.
 
 #### slice
 

seed-schema.json

@@ -2445,6 +2445,27 @@
 									"description": "The thing to search for"
 								}
 							]
+						},
+						"reverse": {
+							"anyOf": [
+								{
+									"$ref": "#/definitions/seedData"
+								},
+								{
+									"$ref": "#/definitions/seedData/anyOf/0/properties/prompt/anyOf/1"
+								},
+								{
+									"anyOf": [
+										{
+											"not": {}
+										},
+										{
+											"type": "boolean"
+										}
+									],
+									"description": "Whether to search from the back to front"
+								}
+							]
 						}
 					},
 					"required": [

src/grow.ts

@@ -630,21 +630,31 @@ const growIndex = async (seed : Seed<SeedDataIndex>, env : Environment) : Promis
 	if (container instanceof Embedding) container = container.text;
 	if (search instanceof Embedding) search = search.text;
 
+	const reverse = await getProperty(seed, env, data.reverse, false);
+
 	if (Array.isArray(container)) {
+		if (reverse) {
+			for (let i = container.length - 1; i >= 0; i--) {
+				if (container[i] == search) return i;
+			}
+			return null;
+		}
 		for (let i = 0; i < container.length; i++) {
 			if (container[i] == search) return i;
 		}
 		return null;
 	}
 	if (container && typeof container == 'object') {
-		for (const [key, value] of Object.entries(container)) {
+		const entries = Object.entries(container);
+		if (reverse) entries.reverse();
+		for (const [key, value] of entries) {
 			if (value == search) return key;
 		}
 		return null;
 	}
 	if (typeof container != 'string') throw new Error('container must be array, object, or string');
 	if (typeof search != 'string') throw new Error('If container is string search must also be string');
-	const result = container.indexOf(search);
+	const result = reverse ? container.lastIndexOf(search) : container.indexOf(search);
 	return result < 0 ? null : result;
 };
 

src/types.ts

@@ -846,7 +846,8 @@ const seedDataConfigIndex = {
 	type: z.literal('index'),
 	properties: {
 		container: inputValue.describe('The thing to search within'),
-		search: inputValue.describe('The thing to search for')
+		search: inputValue.describe('The thing to search for'),
+		reverse: z.boolean().optional().describe('Whether to search from the back to front')
 	}
 };