private async resolveMainClass()

in src/configurationProvider.ts [518:554]
33 lines of code
12 McCabe index (conditional complexity)

    private async resolveMainClass(config: vscode.DebugConfiguration, progressReporter: IProgressReporter):
        Promise<lsPlugin.IMainClassOption | undefined> {
        if (config.projectName) {
            if (this.isFilePath(config.mainClass)) {
                const mainEntries = await lsPlugin.resolveMainMethod(vscode.Uri.file(config.mainClass));
                if (progressReporter.isCancelled()) {
                    return undefined;
                } else if (mainEntries.length) {
                    if (!mainClassPicker.isAutoPicked(mainEntries)) {
                        progressReporter.hide(true);
                    }
                    return mainClassPicker.showQuickPick(mainEntries, "Please select a main class you want to run.");
                }
            }

            return this.promptMainClassUnderProject(config.projectName, progressReporter, "Please select a main class you wan to run");
        }

        // Try to resolve main class from current file
        const currentFile = config.mainClass || vscode.window.activeTextEditor?.document.uri.fsPath;
        if (currentFile) {
            const mainEntries = await lsPlugin.resolveMainMethod(vscode.Uri.file(currentFile));
            if (progressReporter.isCancelled()) {
                return undefined;
            } else if (mainEntries.length) {
                if (!mainClassPicker.isAutoPicked(mainEntries)) {
                    progressReporter.hide(true);
                }
                return mainClassPicker.showQuickPick(mainEntries, "Please select a main class you want to run.");
            }
        }

        const hintMessage = currentFile ?
        `The file '${path.basename(currentFile)}' is not executable, please select a main class you want to run.` :
        "Please select a main class you want to run.";
        return this.promptMainClassUnderPath(undefined, progressReporter, hintMessage);
    }