fansi
A Scala library for safely and efficiently manipulating ANSI-colored strings in command-line applications.
What is fansi?
Fansi is a Scala library that provides a type-safe, efficient abstraction for creating and manipulating ANSI-colored strings in command-line applications. It solves the problem of error-prone manual ANSI code concatenation by offering immutable data structures with safe operations for styling, concatenation, and length calculation. Originally part of the Ammonite REPL, it's now a standalone zero-dependency library.
Scala developers building command-line tools, REPLs, or terminal interfaces that require colored output, such as CLI apps, build tools, or interactive shells.
Developers choose Fansi because it eliminates common ANSI-related bugs like color leaks and incorrect string lengths, while providing a performant, immutable API that works across JVM, Scala.js, and Scala Native without dependencies.
Overview
Scala/Scala.js library for manipulating Fancy Ansi colored strings
Use Cases
Best For
- Building CLI tools with richly colored output and progress indicators
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