feat: support out-of-project files

Co-Authored-By: Alex Butler <[email protected]>

lib/auto-languageclient.ts

@@ -26,7 +26,13 @@ import * as Utils from "./utils"
 import { Socket } from "net"
 import { LanguageClientConnection } from "./languageclient"
 import { ConsoleLogger, FilteredLogger, Logger } from "./logger"
-import { LanguageServerProcess, ServerManager, ActiveServer } from "./server-manager.js"
+import {
+  LanguageServerProcess,
+  ServerManager,
+  ActiveServer,
+  normalizePath,
+  considerAdditionalPath,
+} from "./server-manager.js"
 import { Disposable, CompositeDisposable, Point, Range, TextEditor } from "atom"
 import * as ac from "atom/autocomplete-plus"
 import { basename } from "path"
@@ -391,6 +397,7 @@ export default class AutoLanguageClient {
       connection,
       capabilities: initializeResponse.capabilities,
       disposable: new CompositeDisposable(),
+      additionalPaths: new Set<string>(),
     }
     this.postInitialization(newServer)
     connection.initialized()
@@ -481,10 +488,22 @@ export default class AutoLanguageClient {
   /** (Optional) Finds the project path. If there is a custom logic for finding projects override this method. */
   protected determineProjectPath(textEditor: TextEditor): string | null {
     const filePath = textEditor.getPath()
-    if (filePath == null) {
+    // TODO can filePath be null
+    if (filePath === null || filePath === undefined) {
       return null
     }
-    return this._serverManager.getNormalizedProjectPaths().find((d) => filePath.startsWith(d)) || null
+    const projectPath = this._serverManager.getNormalizedProjectPaths().find((d) => filePath.startsWith(d))
+    if (projectPath !== undefined) {
+      return projectPath
+    }
+
+    const serverWithClaim = this._serverManager
+      .getActiveServers()
+      .find((server) => server.additionalPaths?.has(path.dirname(filePath)))
+    if (serverWithClaim !== undefined) {
+      return normalizePath(serverWithClaim.projectPath)
+    }
+    return null
   }
 
   /**

lib/server-manager.ts

@@ -22,6 +22,8 @@ export interface ActiveServer {
   process: LanguageServerProcess
   connection: ls.LanguageClientConnection
   capabilities: ls.ServerCapabilities
+  /** Out of project directories that this server can also support. */
+  additionalPaths?: Set<string>
 }
 
 interface RestartCounter {
@@ -343,3 +345,13 @@ export function normalizedProjectPathToWorkspaceFolder(normalizedProjectPath: st
 export function normalizePath(projectPath: string): string {
   return !projectPath.endsWith(path.sep) ? path.join(projectPath, path.sep) : projectPath
 }
+
+/** Considers a path for inclusion in `additionalPaths`. */
+export function considerAdditionalPath(
+  server: ActiveServer & { additionalPaths: Set<string> },
+  additionalPath: string
+): void {
+  if (!additionalPath.startsWith(server.projectPath)) {
+    server.additionalPaths.add(additionalPath)
+  }
+}