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I'm a big fan of case-app: https://github.com/alexarchambault/case-app
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Scallop is great -- it allows you to wrap entire functions and routines inside calls which pass arguments (like --name) and use them.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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picocli
Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps can include as source & avoid adding a dependency. Written in Java, usable from Groovy, Kotlin, Scala, etc.
I realized the functional police may jump all over me for suggesting this, but you might want to use https://picocli.info to parse the CLI arts. It's my go-to library. It's development is far more active than any of the scala CLI libraries. And it's well battle tested.
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I know this is at very early stage, no docs, not recommended for prod use but you may want to add zio-cli into your watch list.
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That issue is not about sum types, it's about products of subcommand decoders. E.g. you might want to support a syntax like this:
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.