case-app vs decline

case-app

Type-level & seamless command-line argument parsing for Scala (by alexarchambault)

Argument parsing Scala

Source Code

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decline

A composable command-line parser for Scala. (by bkirwi)

Parsing

Source Code

monovore.com

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case-app		decline
	Project
2	Mentions	2
293	Stars	634
-	Growth	-
7.1	Activity	1.9
about 1 month ago	Latest Commit	about 1 month ago
Scala	Language	Scala
GNU General Public License v3.0 or later	License	Apache License 2.0

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

case-app

Posts with mentions or reviews of case-app. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-07-11.

GitHub - stkeky/best-of-scala: 🏆 A ranked list of awesome Scala libraries. Updated weekly.
2 projects | /r/scala | 11 Jul 2023

If you mean command-line argument parsing, I come back to https://github.com/alexarchambault/case-app everytime 😃 I haven't found any other library that gets less in your way 90% of the time. Conversion to custom data types is done via implicits, but if you've worked with implicits before it's straight-forward.
Recommended CLI parsing libraries
5 projects | /r/scala | 20 Feb 2021

I'm a big fan of case-app: https://github.com/alexarchambault/case-app

decline

Posts with mentions or reviews of decline. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-02-20.

Recommended CLI parsing libraries
5 projects | /r/scala | 20 Feb 2021

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:
Got A Quick Question Ask Here December 28 2020
1 project | /r/scala | 25 Jan 2021

decline and nothing else comes close. It's great.

What are some alternatives?

When comparing case-app and decline you can also consider the following projects:

zio-cli - Rapidly build powerful command-line applications powered by ZIO

Scopt - command line options parsing for Scala

Scallop - a simple Scala CLI parsing library

Apache Spark - Apache Spark - A unified analytics engine for large-scale data processing

best-of-scala - 🏆 A ranked list of awesome Scala projects. Updated weekly.

Scala Parser Combinators - simple combinator-based parsing for Scala. formerly part of the Scala standard library, now a separate community-maintained module

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.

Fast Parse - Writing Fast Parsers Fast in Scala

atto - friendly little parsers

CLIST - Command Line Interface Scala Toolkit