Add support for interpolation in front matter

src/action.ts

@@ -134,13 +134,12 @@ export async function createAnIssue(tools: Toolkit) {
   // Create the new issue
   tools.log.info(`Creating new issue ${templated.title}`);
   try {
+    const templateAssignees = assignees ? assignees : attributes.assignees;
     const issue = await tools.github.issues.create({
       ...tools.context.repo,
       ...templated,
-      assignees: assignees
-        ? listToArray(assignees)
-        : listToArray(attributes.assignees),
-      labels: listToArray(attributes.labels),
+      assignees: templateAssignees ? listToArray(templateAssignees, env, templateVariables) : [],
+      labels: attributes.labels ? listToArray(attributes.labels, env, templateVariables) : [],
       milestone:
         Number(tools.inputs.milestone || attributes.milestone) || undefined,
     });

src/helpers.ts

@@ -1,4 +1,5 @@
 import { Toolkit } from "actions-toolkit";
+import nunjucks from "nunjucks";
 import { z } from "zod";
 
 export const frontmatterSchema = z
@@ -22,7 +23,12 @@ export function setOutputs(
   tools.outputs.url = issue.html_url;
 }
 
-export function listToArray(list?: string[] | string) {
+export function listToArray(
+  list: string[] | string,
+  env: nunjucks.Environment,
+  context: object
+) {
   if (!list) return [];
-  return Array.isArray(list) ? list : list.split(", ");
+  const array = Array.isArray(list) ? list : list.split(", ");
+  return array.map((item) => env.renderString(item, context));
 }

tests/fixtures/.github/kitchen-sink.md

@@ -4,6 +4,7 @@ assignees:
   - JasonEtco
 labels:
   - bugs
+  - "{{ repo.owner }}"
 milestone: 2
 ---
-The action {{ action }} is the best action.
+The action {{ action }} is the best action.

tests/index.test.ts

@@ -91,6 +91,9 @@ describe("create-an-issue", () => {
 
   it("creates a new issue with assignees, labels and a milestone", async () => {
     process.env.INPUT_FILENAME = ".github/kitchen-sink.md";
+    tools.context.payload = {
+      repository: { owner: { login: "JasonEtco" }, name: "waddup" },
+    };
     await createAnIssue(tools);
     expect(params).toMatchSnapshot();
     expect(tools.log.success).toHaveBeenCalled();