refactor: simplify prepare logic with mode-specific implementations

src/tools/export.ts

@@ -0,0 +1,49 @@
+/**
+ * Handles exporting tool-related environment variables
+ */
+
+import * as core from "@actions/core";
+import type { Mode } from "../modes/types";
+import type { ParsedGitHubContext } from "../github/context";
+import {
+  buildAllowedToolsString,
+  buildDisallowedToolsString,
+} from "../create-prompt/index";
+
+export function exportToolEnvironmentVariables(
+  mode: Mode,
+  context: ParsedGitHubContext,
+): void {
+  const hasActionsReadPermission =
+    context.inputs.additionalPermissions.get("actions") === "read" &&
+    context.isPR;
+
+  const modeAllowedTools = mode.getAllowedTools();
+  const modeDisallowedTools = mode.getDisallowedTools();
+
+  // Combine with existing allowed tools
+  const combinedAllowedTools = [
+    ...context.inputs.allowedTools,
+    ...modeAllowedTools,
+  ];
+  const combinedDisallowedTools = [
+    ...context.inputs.disallowedTools,
+    ...modeDisallowedTools,
+  ];
+
+  const allAllowedTools = buildAllowedToolsString(
+    combinedAllowedTools,
+    hasActionsReadPermission,
+    context.inputs.useCommitSigning,
+  );
+  const allDisallowedTools = buildDisallowedToolsString(
+    combinedDisallowedTools,
+    combinedAllowedTools,
+  );
+
+  console.log(`Allowed tools: ${allAllowedTools}`);
+  console.log(`Disallowed tools: ${allDisallowedTools}`);
+
+  core.exportVariable("ALLOWED_TOOLS", allAllowedTools);
+  core.exportVariable("DISALLOWED_TOOLS", allDisallowedTools);
+}