Init implementation of structural search replace

editors/code/src/commands/ssr.ts

@@ -0,0 +1,36 @@
+import { Ctx, Cmd } from '../ctx';
+import { applySourceChange, SourceChange } from '../source_change';
+import * as vscode from 'vscode';
+
+export function ssr(ctx: Ctx): Cmd {
+    return async () => {
+        const client = ctx.client;
+        if (!client) return;
+
+        const options: vscode.InputBoxOptions = {
+            placeHolder: "foo($a:expr, $b:expr) ==>> bar($a, foo($b))",
+            prompt: "Enter request",
+            validateInput: (x: string) => {
+                if (x.includes('==>>')) {
+                    return null;
+                }
+                return "Enter request: pattern ==>> template"
+            }
+        }
+        const request = await vscode.window.showInputBox(options);
+
+        if (!request) return;
+
+        const ssrRequest: SsrRequest = { arg: request };
+        const change = await client.sendRequest<SourceChange>(
+            'rust-analyzer/ssr',
+            ssrRequest,
+        );
+
+        await applySourceChange(ctx, change);
+    };
+}
+
+interface SsrRequest {
+    arg: string;
+}