Swift 6.2 Markdown → ANSI renderer and CLI, modeled on Markdansi but built with swift-markdown + swift-displaywidth. Fast, zero runtime deps, Apple platforms only (macOS 15+, iOS 18+, tvOS 18+, watchOS 11+, visionOS 2+).

• GFM blocks & inline: headings, lists/tasks, blockquotes, code (boxed/labels/gutter), tables (align/pad/dense/truncate/ellipsis), HR, strike, links/autolinks, inline code, emphasis/strong.
• OSC‑8 hyperlinks with auto-detect + force/disable flags; plain suffix fallback when color off.
• Unicode-aware width/wrapping (emoji, CJK) using swift-displaywidth.
• Themes: default, dim, bright, solarized, monochrome, contrast; custom theme support.
• Highlighter hook: inject your own ANSI coloring for fenced code.
• CLI parity with Markdansi flags, plus --force-links.

SwiftPM package:

.package(url: "https://github.com/steipete/Swiftdansi.git", from: "0.1.1")

Targets: Swiftdansi (library), swiftdansi (CLI binary).

import Swiftdansi

// One-off render
let ansi = render("# Hello **world**", options: RenderOptions(width: 60))

// Reusable renderer
let renderNoWrap = createRenderer(options: RenderOptions(wrap: false))
let out = renderNoWrap("A very long line without wrapping")

// Plain text (no ANSI/OSC)
let plain = strip("link to [x](https://example.com)")

// Custom theme & highlighter
let custom = createRenderer(options: RenderOptions(
    theme: .bright,
    highlighter: { code, _ in code.uppercased() }
))

• wrap (default true), width (TTY cols or 80 when wrapping).
• color (default TTY), hyperlinks (auto when color on), force-links / no-links via CLI.
• theme: .default | .dim | .bright | .solarized | .monochrome | .contrast or customTheme.
• Lists: listIndent (default 2), listMarker (default -, set to "•" for dotted lists like Markdansi).
• Quotes: quotePrefix (default │ ).
• Tables: tableBorder unicode|ascii|none, tablePadding, tableDense, tableTruncate, tableEllipsis.
• Code: codeBox, codeGutter, codeWrap.
• highlighter (code, lang?) -> String.

swiftdansi [--in FILE] [--out FILE] [--width N] [--no-wrap] [--no-color] [--no-links] [--force-links]
          [--theme default|dim|bright|solarized|monochrome|contrast]
          [--list-indent N] [--quote-prefix STR]
          [--table-border unicode|ascii|none] [--table-padding N] [--table-dense]
          [--table-truncate[=true|false]] [--table-ellipsis STR]
          [--code-wrap[=true|false]] [--code-box[=true|false]] [--code-gutter]

• Input: stdin if --in missing or -; output: stdout unless --out.
• Hyperlinks: auto-detect when color on; override with --force-links or --no-links.
• Handles SIGPIPE for pipelines.

Tiny demo CLI that uses the Swiftdansi library (Swift 6.2):

cd Examples/SwiftdansiCLI
swift run SwiftdansiDemo --
swift run SwiftdansiDemo -- ../../README.md --theme bright --width 72

• Build: swift build (or pnpm build)
• Test: swift test (or pnpm test)
• Lint: pnpm lint (SwiftLint, config in .swiftlint.yml)
• Format: pnpm format (SwiftFormat, config in .swiftformat)

• Tests (Swift-Testing): swift test
• CI: .github/workflows/ci.yml runs swift test on macOS 15.

MIT

Built as a Swift port of Markdansi; see that project for the original TypeScript implementation and behavior notes.