Forward the compilation database path to the LS.

Tha path to the compilation database is optional.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

Author: Akos Kitta

src/extension.ts

@@ -7,6 +7,10 @@ interface LanguageServerConfig {
     readonly lsPath: string;
     readonly cliPath: string;
     readonly clangdPath: string;
+    /**
+     * Filesystem path pointing to the folder that contains the `compile_commands.json` file.
+     */
+    readonly compileCommandsPath?: string;
     readonly board: {
         readonly fqbn: string;
         readonly name?: string;
@@ -55,11 +59,14 @@ function buildLanguageClient(config: LanguageServerConfig): LanguageClient {
     if (!serverTraceChannel) {
         serverTraceChannel = vscode.window.createOutputChannel('Arduino Language Server (trace)');
     }
-    const { lsPath: command, clangdPath, cliPath, board, flags, env } = config;
+    const { lsPath: command, clangdPath, cliPath, board, flags, env, compileCommandsPath } = config;
     const args = ['-clangd', clangdPath, '-cli', cliPath, '-fqbn', board.fqbn];
     if (board.name) {
         args.push('-board-name', board.name);
     }
+    if (compileCommandsPath) {
+        args.push('-compile-commands-dir', compileCommandsPath);
+    }
     if (flags && flags.length) {
         args.push(...flags);
     }