Use the Buf CLI as an LSP

.vscodeignore

@@ -1,11 +1,16 @@
+.github/**
 .vscode/**
 .vscode-test/**
 out/test/**
 src/**
+test-workspaces/**
+.envrc
 .gitignore
-.yarnrc
-vsc-extension-quickstart.md
+.eslintrc.json
+.vscode-test.mjs
 **/tsconfig.json
 **/.eslintrc.json
 **/*.map
 **/*.ts
+**/*.md
+**/Makefile

package.json

@@ -2,7 +2,7 @@
   "name": "vscode-buf",
   "displayName": "Buf",
   "description": "Visual Studio Code support for Buf",
-  "version": "0.6.2",
+  "version": "0.7.0-devel",
   "icon": "logo.png",
   "publisher": "bufbuild",
   "repository": {
@@ -49,9 +49,19 @@
   "contributes": {
     "commands": [
       {
-        "category": "Linters",
-        "command": "vscode-buf.lint",
-        "title": "Lint protobuf files using Buf"
+        "category": "Buf",
+        "command": "buf.restartServer",
+        "title": "Restart language server"
+      },
+      {
+        "category": "Buf",
+        "command": "buf.stopServer",
+        "title": "Stop language server"
+      },
+      {
+        "category": "Buf",
+        "command": "buf.outputPanel",
+        "title": "Reveal output panel"
       }
     ],
     "configuration": {
@@ -89,13 +99,22 @@
           "Protobuf"
         ],
         "configuration": "./protobuf-language-configuration.json"
+      },
+      {
+        "//": "This is a special language used by the 'declaration' part of hover inlays in Markdown.",
+        "id": "proto-decl"
       }
     ],
     "grammars": [
       {
         "language": "proto",
         "scopeName": "source.proto",
-        "path": "./syntaxes/proto.tmLanguage.json"
+        "path": "./syntaxes/proto.json"
+      },
+      {
+        "language": "proto-decl",
+        "scopeName": "source.proto-decl",
+        "path": "./syntaxes/proto-decl.json"
       }
     ]
   },
@@ -110,6 +129,9 @@
     "test": "vscode-test",
     "package": "vsce package"
   },
+  "dependencies": {
+    "vscode-languageclient": "^9.0.0"
+  },
   "devDependencies": {
     "@types/mocha": "^10.0.6",
     "@types/node": "^20.x",

src/binary.ts

@@ -0,0 +1,62 @@
+import * as fs from "fs";
+import * as path from "path";
+import * as vscode from "vscode";
+
+import { Error, Result } from "./error";
+
+import pkg from "../package.json";
+
+/**
+ * A located Buf CLI binary.
+ */
+export class Binary {
+  cwd: string
+  path: string
+
+  constructor(cwd: string, path: string) {
+    this.cwd = cwd
+    this.path = path
+  }
+
+  static find(defaultPath: string = defaultBinaryPath): Result<Binary> {
+    let workspace = findWorkspacePath()
+    if (workspace instanceof Error) {
+      return workspace
+    }
+
+    let config = vscode.workspace.getConfiguration("buf");
+    let binaryPath = config!.get<string>("binaryPath");
+    if (binaryPath === undefined) {
+      return new Error("Buf CLI path was not set");
+    }
+
+    if (!path.isAbsolute(binaryPath) && binaryPath !== defaultPath) {
+      // Check if file exists.
+      binaryPath = path.join(workspace, binaryPath);
+      if (!fs.existsSync(binaryPath)) {
+        return new Error(`Buf CLI does not exist: file not found: ${binaryPath}`);
+      }
+    }
+
+    return new Binary(workspace, binaryPath)
+  }
+}
+
+const defaultBinaryPath = pkg.contributes.configuration.properties["buf.binaryPath"].default;
+
+export function findWorkspacePath(): Result<string> {
+  if (vscode.workspace.workspaceFolders === undefined) {
+    return new Error("workspace folders was undefined");
+  }
+
+  if (vscode.workspace.workspaceFolders.length === 0) {
+    return new Error("workspace folders was not set");
+  }
+
+  let uri = vscode.workspace.workspaceFolders[0].uri;
+  if (uri.scheme !== "file") {
+    return new Error(`uri was not file: ${uri.scheme}`);
+  }
+
+  return uri.fsPath;
+}