Add more template tag plugins (#3)

plugins/template-function-file/src/index.ts

@@ -0,0 +1,18 @@
+import { CallTemplateFunctionArgs, Context, PluginDefinition } from '@yaakapp/api';
+import fs from 'node:fs';
+
+export const plugin: PluginDefinition = {
+  templateFunctions: [{
+    name: 'fs.readFile',
+    args: [{ title: 'Select File', type: 'file', name: 'path', label: 'File' }],
+    async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
+      if (!args.values.path) return null;
+
+      try {
+        return fs.promises.readFile(args.values.path, 'utf-8');
+      } catch (err) {
+        return null;
+      }
+    },
+  }],
+};