feat: add experimental lsp tool (#5886)

packages/opencode/src/tool/lsp.ts

@@ -0,0 +1,87 @@
+import z from "zod"
+import { Tool } from "./tool"
+import path from "path"
+import { LSP } from "../lsp"
+import DESCRIPTION from "./lsp.txt"
+import { Instance } from "../project/instance"
+import { pathToFileURL } from "url"
+
+const operations = [
+  "goToDefinition",
+  "findReferences",
+  "hover",
+  "documentSymbol",
+  "workspaceSymbol",
+  "goToImplementation",
+  "prepareCallHierarchy",
+  "incomingCalls",
+  "outgoingCalls",
+] as const
+
+export const LspTool = Tool.define("lsp", {
+  description: DESCRIPTION,
+  parameters: z.object({
+    operation: z.enum(operations).describe("The LSP operation to perform"),
+    filePath: z.string().describe("The absolute or relative path to the file"),
+    line: z.number().int().min(1).describe("The line number (1-based, as shown in editors)"),
+    character: z.number().int().min(1).describe("The character offset (1-based, as shown in editors)"),
+  }),
+  execute: async (args) => {
+    const file = path.isAbsolute(args.filePath) ? args.filePath : path.join(Instance.directory, args.filePath)
+    const uri = pathToFileURL(file).href
+    const position = {
+      file,
+      line: args.line - 1,
+      character: args.character - 1,
+    }
+
+    const relPath = path.relative(Instance.worktree, file)
+    const title = `${args.operation} ${relPath}:${args.line}:${args.character}`
+
+    const exists = await Bun.file(file).exists()
+    if (!exists) {
+      throw new Error(`File not found: ${file}`)
+    }
+
+    const available = await LSP.hasClients(file)
+    if (!available) {
+      throw new Error("No LSP server available for this file type.")
+    }
+
+    await LSP.touchFile(file, true)
+
+    const result: unknown[] = await (async () => {
+      switch (args.operation) {
+        case "goToDefinition":
+          return LSP.definition(position)
+        case "findReferences":
+          return LSP.references(position)
+        case "hover":
+          return LSP.hover(position)
+        case "documentSymbol":
+          return LSP.documentSymbol(uri)
+        case "workspaceSymbol":
+          return LSP.workspaceSymbol("")
+        case "goToImplementation":
+          return LSP.implementation(position)
+        case "prepareCallHierarchy":
+          return LSP.prepareCallHierarchy(position)
+        case "incomingCalls":
+          return LSP.incomingCalls(position)
+        case "outgoingCalls":
+          return LSP.outgoingCalls(position)
+      }
+    })()
+
+    const output = (() => {
+      if (result.length === 0) return `No results found for ${args.operation}`
+      return JSON.stringify(result, null, 2)
+    })()
+
+    return {
+      title,
+      metadata: { result },
+      output,
+    }
+  },
+})