CLI Printing Press — Generate Feature-Complete CLIs from Any API

Introduction

CLI Printing Press takes an API specification, studies every competing CLI that exists for that API, and generates a comprehensive command-line tool that combines the best features from all of them. The generated CLIs include SQLite-backed local caching, offline search, and compound commands that provide insights across multiple API endpoints.

What CLI Printing Press Does

• Reads OpenAPI and other API specification formats to understand available endpoints
• Analyzes existing CLI tools for the same API to identify feature gaps
• Generates a complete Go-based CLI with subcommands for every API operation
• Adds SQLite synchronization for offline querying and compound insight commands
• Produces JSON-first output designed for both human use and AI agent consumption

Architecture Overview

The generator parses API specifications into an internal model, then queries for competing tools targeting the same API. It synthesizes a feature matrix and generates Go source code using templates that include a SQLite data layer. The generated CLI handles authentication, pagination, and rate limiting automatically. Local SQLite databases cache API responses for offline access, and compound commands join data across cached resources.

Self-Hosting & Configuration

• Clone the repository and build with Go 1.21 or later
• Point the generator at any OpenAPI specification URL or local file
• Configure API authentication credentials in the generated CLI's config file
• Adjust output directory and package naming via command-line flags
• Generated CLIs are standalone binaries that require no runtime dependencies

Key Features

• Automatic SQLite sync layer for offline data access and search
• Compound insight commands that correlate data across multiple API resources
• JSON-first output format compatible with jq and AI agent toolchains
• Generated code is clean, idiomatic Go that can be customized further
• No interactive prompts by design, making it suitable for scripting and CI pipelines

Comparison with Similar Tools

• OpenAPI Generator — produces API client libraries; CLI Printing Press generates full-featured CLI tools with caching
• Swagger Codegen — focuses on SDK generation; CLI Printing Press adds offline search and compound commands
• Cobra — CLI framework requiring manual command implementation; CLI Printing Press automates the entire CLI creation
• restish — generic REST client; CLI Printing Press creates API-specific CLIs with tailored subcommands

FAQ

Q: What API specification formats are supported? A: OpenAPI 3.x is the primary supported format. Support for other formats depends on the specification parser.

Q: Can I customize the generated CLI after generation? A: Yes, the generated Go code is designed to be readable and extensible. You can add custom commands or modify existing ones.

Q: How does the SQLite sync work? A: The generated CLI includes a sync command that fetches API data and stores it locally. Subsequent queries can run against the local database.

Q: Does it work with authenticated APIs? A: Yes, the generated CLI supports API key, OAuth, and bearer token authentication patterns.

Sources

• https://github.com/mvanhorn/cli-printing-press