Crawl, walk & run your way to usable CLIs in Go (Go Time #337)
Nov 12, 2024
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Wesley Beary, a CLI and API development expert at Anchor, shares his journey through building production-ready CLIs. He discusses the challenges of usability and the steep learning curve of Go. The conversation includes effective testing strategies, user experience enhancements, and the transition from Ruby to Go. Beary emphasizes the importance of intuitive design, features like interactive modes, and the balance between functionality for novice and advanced users. It's a deep dive into the art of creating user-friendly command-line interfaces.
The episode discusses the flexibility offered by Fly in deploying applications compared to traditional platforms like Heroku, which often impose limitations.
Insights are shared on the journey of creating custom CLI tools, emphasizing a user-centered design approach for better usability and functionality.
The challenges of testing CLI tools are addressed, highlighting the balance between mocked responses and real API calls for reliable integration.
Deep dives
Exploring Fly's Unique Appeal to Developers
Fly is presented as a developer-centric platform that adapts to the needs of different generations of developers. The discussion highlights how Fly allows for flexibility in application deployment, emphasizing that many developers often encounter limits with platforms like Heroku or Vercel when attempting to implement advanced features. For instance, developers might feel constrained when trying to implement complex functionalities such as full-text search or LLM integrations on these platforms. By contrast, Fly is described as having no limits, providing robust primitives and capabilities that empower developers to configure their applications according to their needs without the typical restrictions found in other services.
The Journey of Building a Custom CLI
One developer shares his journey in creating custom CLI tools, moving away from off-the-shelf solutions to craft a more tailored experience. Initially working on the Heroku CLI, this developer transitioned to Anchor, where he aimed to improve the user experience for CLI operation, particularly in the context of encryption tasks. The motivation behind this was to provide a better alternative to existing tools, which were often cumbersome and unintuitive. With a focus on rapid iteration and user-centered design, the conversation emphasizes developing capabilities that are both simple to use and deeply functional.
Challenges in Testing CLI Functionality
The podcast delves into the complexities of testing CLI tools, especially when network interactions are involved. The developer explains the balance between using mocked responses for initial tests versus running real API calls to validate different functionalities. Utilizing tools like Prism for mock server testing allows the team to easily iterate on development, while setting strict guidelines for the API interactions keeps the integration smooth and reliable. Furthermore, this approach aids in mitigating the risk of breaking changes and enhances the understanding of how the CLI responds under different circumstances.
Emphasizing User Learning Through Command Design
A significant focus of the CLI development process involves designing commands that facilitate user learning and retention of knowledge. The developer underscores the drawbacks of using positional arguments in multi-command CLIs, noting that they often lead to confusion and a lack of transferable knowledge between commands. Instead, by using named flags for each argument, users can have a more consistent and understandable experience. This design philosophy aims to ensure users retain valuable information that equips them to use future commands more effectively.
The Transition from Ruby to Go
The developer shares insights about his transition from Ruby to Go during his time building CLI tools, highlighting both the challenges and advantages of working with these languages. Though Ruby offers expressive syntax and metaprogramming capabilities, the complexities involved in distribution can be cumbersome. In contrast, Go provides robust options for logically structuring applications but introduces challenges such as handling pointers and error checks. Ultimately, this developer's experiences illustrate the importance of language choice in development workflows and how certain challenges can provide learning opportunities for growth.
With the number of libraries available to Go developers these days, you’d think building a CLI app was now a trivial matter. But like many things in software development, it depends. In this episode, we explore the challenges that arose during one team’s journey towards a production-ready CLI.
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