public async resolveMainSketch()

in src/deviceContext.ts [308:354]
43 lines of code
11 McCabe index (conditional complexity)

    public async resolveMainSketch() {
        // TODO (EW, 2020-02-18): Here you look for *.ino files but below you allow
        //  *.cpp/*.c files to be set as sketch
        await vscode.workspace.findFiles("**/*.ino", null)
            .then(async (fileUris) => {
                if (fileUris.length === 0) {
                    let newSketchFileName = await vscode.window.showInputBox({
                        value: "sketch.ino",
                        prompt: "No sketch (*.ino) found in workspace, please provide a name",
                        placeHolder: "Sketch file name (*.ino or *.cpp)",
                        validateInput: (value) => {
                            if (value && /^[\w-]+\.(?:ino|cpp)$/.test(value.trim())) {
                                return null;
                            } else {
                                return "Invalid sketch file name. Should be *.ino/*.cpp";
                            }
                        },
                    });
                    newSketchFileName = (newSketchFileName && newSketchFileName.trim()) || "";
                    if (newSketchFileName) {
                        const snippets = fs.readFileSync(path.join(this.extensionPath, "snippets", "sample.ino"));
                        fs.writeFileSync(path.join(ArduinoWorkspace.rootPath, newSketchFileName), snippets);
                        this.sketch = newSketchFileName;
                        // Set a build directory in new configurations to avoid warnings about slow builds.
                        this.output = "build";
                        // Open the new sketch file.
                        const textDocument = await vscode.workspace.openTextDocument(path.join(ArduinoWorkspace.rootPath, newSketchFileName));
                        vscode.window.showTextDocument(textDocument, vscode.ViewColumn.One, true);
                    } else {
                        this.sketch = undefined;
                    }
                } else if (fileUris.length === 1) {
                    this.sketch = path.relative(ArduinoWorkspace.rootPath, fileUris[0].fsPath);
                } else if (fileUris.length > 1) {
                    const chosen = await vscode.window.showQuickPick(<vscode.QuickPickItem[]>fileUris.map((fileUri): vscode.QuickPickItem => {
                        return <vscode.QuickPickItem>{
                            label: path.relative(ArduinoWorkspace.rootPath, fileUri.fsPath),
                            description: fileUri.fsPath,
                        };
                    }), { placeHolder: "Select the main sketch file" });
                    if (chosen && chosen.label) {
                        this.sketch = chosen.label;
                    }
                }
            });
        return this.sketch;
    }