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packages/opencode/src/tool/lsp-hover.ts

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+import { z } from "zod";
+import { Tool } from "./tool";
+import path from "path";
+import { LSP } from "../lsp";
+import { App } from "../app/app";
+
+export const LspHoverTool = Tool.define({
+  name: "opencode.lsp_hover",
+  description: `
+  Looks up hover information for a given position in a source file using the Language Server Protocol (LSP). 
+  This includes type information, documentation, or symbol details at the specified line and character. 
+  Useful for providing code insights, explanations, or context-aware assistance based on the user's current cursor location.
+  `,
+  parameters: z.object({
+    file: z.string().describe("The path to the file to get diagnostics."),
+    line: z.number().describe("The line number to get diagnostics."),
+    character: z.number().describe("The character number to get diagnostics."),
+  }),
+  execute: async (args) => {
+    console.log(args);
+    const app = await App.use();
+    const file = path.isAbsolute(args.file)
+      ? args.file
+      : path.join(app.root, args.file);
+    await LSP.file(file);
+    const result = await LSP.hover({
+      ...args,
+      file,
+    });
+    console.log(result);
+    return {
+      metadata: {
+        result,
+      },
+      output: JSON.stringify(result, null, 2),
+    };
+  },
+});