.github/workflows/release.yml

@@ -2,39 +2,31 @@ on:
   release:
     types: [created]
 
-name: Create new formula version
+name: Upload tarball for release
 
 jobs:
   upload-release:
-    name: Create new formula version
+    name: Upload Release Asset
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout formula repo
-        uses: actions/checkout@v2
-        with:
-            repository: ${{ github.repository_owner }}/homebrew-makecolors
-            token: ${{ secrets.PUBLISH_FORMULA_TOKEN }}
-      - name: Update formula
+      - name: Set release tarball name
         run: |
-            cat << EOF > Formula/make-colors.rb
-            class MakeColors < Formula
-              desc "Converts a simple list of color definitions to asset catalogs for Xcode and resource XML for Android"
-              homepage "https://github.com/${{ github.repository }}"
-              url "https://github.com/${{ github.repository }}.git", :tag => "${{ github.event.release.tag_name }}", :revision => "${{ github.sha }}"
-              head "https://github.com/${{ github.repository }}.git"
-              license "MIT"
+            echo "TARBALL_NAME=$(echo MakeColors-${GITHUB_REF##*/v})" >> $GITHUB_ENV
 
-              depends_on :xcode => ["14.0", :build]
+      - name: Checkout code
+        uses: actions/checkout@v2
 
-              def install
-                system "make", "install", "prefix=#{prefix}"
-              end
-            end
-            EOF
+      - name: Pack tarball
+        run: |
+          git archive HEAD --prefix=${{ env.TARBALL_NAME }}/ | bzip2 > ${{ env.TARBALL_NAME }}.tar.bz2
 
-            git config user.name github-actions
-            git config user.email github-actions@github.com
-
-            git add Formula/make-colors.rb
-            git commit -m "Update formula for ${{ github.event.release.tag_name }}"
-            git push
+      - name: Upload Release Asset
+        id: upload
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ github.event.release.upload_url }}
+          asset_path: ./${{ env.TARBALL_NAME }}.tar.bz2
+          asset_name: ${{ env.TARBALL_NAME }}.tar.bz2
+          asset_content_type: application/x-bzip2

.github/workflows/test.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   BuildAndTest:
-    runs-on: macos-12
+    runs-on: macos-latest
     steps:
       - uses: actions/checkout@v1
 

.swift-version

@@ -1 +1 @@
-5.7
+5.3

Example/.gitignore

@@ -1,2 +0,0 @@
-Example.*
-!Example.txt

Example/Example.txt

@@ -1,10 +0,0 @@
-Base/Green #8fd151
-Base/PaleGreen #d0f9a9
-Base/Red rgb(249, 39, 7)
-TransparentRed rgba(255, 0, 0, 128)
-Base/Yellow #ff0
-
-Error @Base/Red
-Warning @Base/Yellow
-Good @Base/Green
-

Makefile

@@ -1,17 +0,0 @@
-prefix ?= /usr/local
-bindir = $(prefix)/bin
-
-build:
-	swift build -c release --disable-sandbox
-
-install: build
-	install -d "$(bindir)"
-	install ".build/release/MakeColors" "$(bindir)/make-colors"
-
-uninstall:
-	rm -rf "$(bindir)/make-colors"
-
-clean:
-	rm -rf .build
-
-.PHONY: build install uninstall clean

Package.resolved

@@ -1,23 +1,16 @@
 {
-  "pins" : [
+  "object": {
+    "pins": [
       {
-      "identity" : "rbbjson",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/robb/RBBJSON",
-      "state" : {
-        "branch" : "main",
-        "revision" : "102c970283e105d7c5be2e29630db29c808c20eb"
+        "package": "swift-argument-parser",
+        "repositoryURL": "https://github.com/apple/swift-argument-parser",
+        "state": {
+          "branch": null,
+          "revision": "92646c0cdbaca076c8d3d0207891785b3379cbff",
+          "version": "0.3.1"
         }
+      }
+    ]
   },
-    {
-      "identity" : "swift-argument-parser",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-argument-parser",
-      "state" : {
-        "revision" : "9f39744e025c7d377987f30b03770805dcb0bcd1",
-        "version" : "1.1.4"
-      }
-    }
-  ],
-  "version" : 2
+  "version": 1
 }

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.7
+// swift-tools-version:5.3
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -6,25 +6,27 @@ import PackageDescription
 let package = Package(
     name: "MakeColors",
     platforms: [
-        .macOS("12.0"),
+        .macOS(.v10_15),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-argument-parser", .upToNextMinor(from: "1.1.4")),
-        .package(url: "https://github.com/robb/RBBJSON", branch: "main"),
+        .package(url: "https://github.com/apple/swift-argument-parser", .upToNextMinor(from: "0.3.1")),
     ],
     targets: [
-        .executableTarget(
+        .target(
             name: "MakeColors",
+            dependencies: [
+                "LibMakeColors",
+            ]
+        ),
+        .target(
+            name: "LibMakeColors",
             dependencies: [
                 .product(name: "ArgumentParser", package: "swift-argument-parser"),
             ]
         ),
         .testTarget(
             name: "MakeColorsTests",
-            dependencies: [
-                "MakeColors",
-                .product(name: "RBBJSON", package: "RBBJSON"),
-            ]
+            dependencies: ["LibMakeColors"]
         ),
     ]
 )

README.md

@@ -2,70 +2,21 @@
 
 Converts a simple list of color definitions to asset catalogs for Xcode, resource XML for Android or an HTML preview.
 
-## Installation
-
-Install via [Homebrew](https://brew.sh):
-
-```
-brew tap 5sw/makecolors
-brew install make-colors
-```
-
-If you don’t use Homebrew you can also install directly from source. Clone the repository or download the release and run `make install` inside the working copy.
-
-## Usage
-
-```
-USAGE: make-colors <input> [--ios] [--android] [--html] [--prefix <prefix>] [--output <output>] [--dump]
-
-ARGUMENTS:
-  <input>                 The color list to process. 
-        Use - to process the standard input.
-
-OPTIONS:
-  --ios/--android/--html  The formatter to use. (default: ios)
-  --prefix <prefix>       Prefix for color names. 
-  --output <output>       Output file to write. 
-        Use - for standard output.
-        Default is the input file name with the appropriate file extension. If
-        the input is - the default is standard output.
-        Note that asset catalogs cannot be written to standard output.
-  --dump                  List read colors on console. 
-  -h, --help              Show help information.
-```
-
 ## Input format
 
 Each line in your input contains one color definition. That is a name followed by the actual color. We support RGB colors in a few formats similar to CSS:
 
 ```
-Base/Green #8fd151
-Base/PaleGreen #d0f9a9
-Base/Red rgb(249, 39, 7)
-TransparentRed rgba(255, 0, 0, 128)
-Base/Yellow #ff0
-```
-
-Grayscale colors can be produced with the `white(value)` and `white(value, alpha)` syntax. A value of zero means black while a value of 255 is pure white. 
-
-```
-Black white(0)
-MediumGray white(128)
-TransparentGray white(128, 128)
-```
-
-HSV colors can be specified as `hsv(hue, saturation, value)` or `hsva(hue, saturation, value, alpha)` syntax. Hue is specified as degrees with the `°` or `deg` suffix.
-
-```
-HSV/Yellow hsv(60°, 255, 255)
+Color/Color1 #fff
+Color/Color2 #abcdeff0
+Color/Color3 rgb(12, 13, 53)
+Color/Color4 rgba(250, 250, 250, 128)
 ```
 
 Colors can also reference other colors by prefixing them with an `@` sign:
 
 ```
-Error @Base/Red
-Warning @Base/Yellow
-Good @Base/Green
+ColorAlias @Color/Color1
 ```
 
 ## Output format
@@ -74,41 +25,17 @@ Good @Base/Green
 
 The optional prefix followed by a `/` is added in front of the color name. Then for each part separate by / a new folder that provides namespace is inserted in the asset catalogs. Spaces are inserted between CamelCase words. Color references are inserted as copies of the original color.
 
-For the given example input the generated asset catalog looks like this: 
-
-![](Docs/assetcatalog.png)
-
 ### Android resource XML (`--android`)
 
 The optional prefix, followed by a underscore is added in front of the name. Names are converted from CamelCase to snake_case and / is replaced by underscores as well. Color references the generated color resource also references the original color.
 
-The generated XML for the example input looks like this:
-
-```
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <color name="base_green">#8FD151</color>
-    <color name="base_pale_green">#D0F9A9</color>
-    <color name="base_red">#F92707</color>
-    <color name="base_yellow">#FFFF00</color>
-    <color name="transparent_red">#FF000080</color>
-    <color name="error">@color/base_red</color>
-    <color name="good">@color/base_green</color>
-    <color name="warning">@color/base_yellow</color>
-</resources>
-</xml>
-```
-
 ### HTML preview (`--html`)
 
 Generates a simple HTML table with the color names, values and a sample.
 
-The generated HTML looks like this:
-
-![](Docs/html.png)
-
 ## Future work
 
+- Support other color formats (HSV, ...)
 - Calculate derived colors (blend, change hue/saturation/brightness/alpha)
 - Support for dark/light mode
 - Improved error reporting in the parser

Sources/LibMakeColors/Generators/AssetCatalogGenerator.swift

@@ -1,7 +1,7 @@
 import Foundation
 
 final class AssetCatalogGenerator: Generator {
-    static let defaultExtension = "xcassets"
+    static let defaultExtension = "xcasset"
     static let option = "ios"
 
     let context: Context
@@ -58,7 +58,7 @@ private let infoTag = """
 }
 """
 
-extension Color {
+private extension Color {
     func json() -> String {
         """
         {
@@ -67,10 +67,10 @@ extension Color {
             "color" : {
                 "color-space" : "srgb",
                 "components" : {
-                "alpha" : "\(Double(alpha) / 0xFF)",
-                "blue" : "0x\(blue, radix: 16, width: 2)",
-                "green" : "0x\(green, radix: 16, width: 2)",
-                "red" : "0x\(red, radix: 16, width: 2)"
+                "alpha" : "\(Float(alpha) / 256)",
+                "blue" : "0x\(String(blue, radix: 16))",
+                "green" : "0x\(String(green, radix: 16))",
+                "red" : "0x\(String(red, radix: 16))"
                 }
             },
             "idiom" : "universal"
@@ -88,22 +88,6 @@ extension Color {
     }
 }
 
-extension String.StringInterpolation {
-    mutating func appendInterpolation<I: BinaryInteger>(
-        _ value: I,
-        radix: Int,
-        width: Int = 0,
-        uppercase: Bool = true
-    ) {
-        var string = String(value, radix: radix, uppercase: uppercase)
-        if width > string.count {
-            string.insert(contentsOf: String(repeating: "0", count: width - string.count), at: string.startIndex)
-        }
-
-        appendLiteral(string)
-    }
-}
-
 private let group = """
 {
   "properties" : {

Sources/LibMakeColors/Generators/Generator.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-protocol Generator: AnyObject {
+protocol Generator: class {
     static var defaultExtension: String { get }
     static var option: String { get }
 
@@ -9,7 +9,7 @@ protocol Generator: AnyObject {
     func generate(data: [String: ColorDef]) throws -> FileWrapper
 }
 
-protocol Context: AnyObject {
+protocol Context: class {
     var prefix: String? { get }
 }
 

Sources/LibMakeColors/MakeColors.swift

@@ -0,0 +1,83 @@
+import ArgumentParser
+import Foundation
+
+private struct GeneratorOption: EnumerableFlag, CustomStringConvertible {
+    static let allCases: [GeneratorOption] = [
+        .init(type: AssetCatalogGenerator.self),
+        .init(type: AndroidGenerator.self),
+        .init(type: HTMLGenerator.self),
+    ]
+
+    let type: Generator.Type
+
+    var description: String {
+        type.option
+    }
+
+    static func == (lhs: GeneratorOption, rhs: GeneratorOption) -> Bool {
+        lhs.type == rhs.type
+    }
+}
+
+enum Errors: Error {
+    case syntaxError
+    case duplicateColor(String)
+    case missingReference(String)
+    case cyclicReference(String)
+}
+
+public final class MakeColors: ParsableCommand, Context {
+    @Argument(help: "The color list to proces")
+    var input: String
+
+    @Flag(help: "The formatter to use")
+    private var formatter = GeneratorOption.allCases[0]
+
+    @Option(help: "Prefix for color names")
+    var prefix: String?
+
+    @Option(help: "Output file")
+    var output: String?
+
+    public init() {}
+
+    public func run() throws {
+        let url = URL(fileURLWithPath: input)
+        let string = try String(contentsOf: url)
+
+        let scanner = Scanner(string: string)
+        scanner.charactersToBeSkipped = .whitespaces
+
+        let data = try scanner.colorList()
+
+        for (key, color) in data.sorted() {
+            let resolved = try data.resolve(key)
+            switch color {
+            case .color:
+                print(key.insertCamelCaseSeparators(), resolved, separator: ": ")
+
+            case let .reference(referenced):
+                print(
+                    "\(key.insertCamelCaseSeparators()) (@\(referenced.insertCamelCaseSeparators()))",
+                    resolved,
+                    separator: ": "
+                )
+            }
+        }
+
+        let generator = formatter.type.init(context: self)
+        let fileWrapper = try generator.generate(data: data)
+
+        let writeURL = outputURL(extension: formatter.type.defaultExtension)
+        try fileWrapper.write(to: writeURL, options: .atomic, originalContentsURL: nil)
+    }
+
+    func outputURL(extension: String) -> URL {
+        if let output = output {
+            return URL(fileURLWithPath: output)
+        } else {
+            let basename = URL(fileURLWithPath: input).deletingPathExtension().lastPathComponent
+            return URL(fileURLWithPath: basename).appendingPathExtension(`extension`)
+        }
+    }
+}

Sources/LibMakeColors/Model/Color.swift

@@ -19,14 +19,6 @@ struct Color: CustomStringConvertible, Equatable {
         alpha = array.count == 4 ? array[3] : 0xFF
     }
 
-    init(white array: [UInt8]) {
-        precondition(array.count == 1 || array.count == 2)
-        red = array[0]
-        green = array[0]
-        blue = array[0]
-        alpha = array.count == 2 ? array[1] : 0xFF
-    }
-
     var description: String {
         let alphaSuffix = alpha != 0xFF ? String(format: "%02X", alpha) : ""
         return String(format: "#%02X%02X%02X%@", red, green, blue, alphaSuffix)

Sources/LibMakeColors/Model/Scanner+ColorParser.swift

@@ -19,70 +19,17 @@ extension Scanner {
             }
         }
 
-        if string("rgba"), let components = argumentList(4) {
+        if string("rgba"), string("("), let components = commaSeparated(), components.count == 4, string(")") {
             return Color(components)
         }
 
-        if string("rgb"), let components = argumentList(3) {
+        if string("rgb"), string("("), let components = commaSeparated(), components.count == 3, string(")") {
             return Color(components)
         }
 
-        if string("white"), let arguments = argumentList(min: 1, max: 2) {
-            return Color(white: arguments)
-        }
-
-        if string("hsva") {
-            return readHSV(alpha: true)
-        }
-
-        if string("hsv") {
-            return readHSV(alpha: false)
-        }
-
         return nil
     }
 
-    private func readHSV(alpha readAlpha: Bool) -> Color? {
-        guard
-            string("("),
-            let hue = degrees(),
-            string(","),
-            let saturation = component(),
-            string(","),
-            let value = component()
-        else { return nil }
-
-        let alpha: UInt8
-
-        if readAlpha {
-            guard
-                string(","),
-                let value = component()
-            else { return nil }
-            alpha = value
-        } else {
-            alpha = 0xFF
-        }
-
-        guard string(")") else { return nil }
-
-        return Color(hue: hue, saturation: saturation, value: value, alpha: alpha)
-    }
-
-    func degrees() -> Int? {
-        guard let int = scanInt() else { return nil }
-
-        if string("%") {
-            guard 0...100 ~= int else { return nil }
-            return (360 * int) / 100
-        } else if string("°") || string("deg") {
-            return int
-        } else {
-            guard 0...0xFF ~= int else { return nil }
-            return (360 * int) / 0xFF
-        }
-    }
-
     func colorReference() -> String? {
         guard string("@") else { return nil }
         return name()
@@ -110,7 +57,7 @@ extension Scanner {
 
     func colorLine() -> (String, ColorDef)? {
         guard
-            let name = name(),
+            let name = self.name(),
             let def = colorDef(),
             endOfLine()
         else {
@@ -144,50 +91,17 @@ extension Scanner {
         return result
     }
 
-    // swiftlint:disable:next discouraged_optional_collection
-    func argumentList(_ count: Int) -> [UInt8]? {
-        argumentList(min: count, max: count)
-    }
-
-    // swiftlint:disable:next discouraged_optional_collection
-    func argumentList(min: Int, max: Int? = nil) -> [UInt8]? {
-        let max = max ?? Int.max
-        guard
-            string("("),
-            let arguments = commaSeparated(),
-            string(")"),
-            (min...max) ~= arguments.count
-        else {
-            return nil
-        }
-
-        return arguments
-    }
-
     // swiftlint:disable:next discouraged_optional_collection
     func commaSeparated() -> [UInt8]? {
         var result: [UInt8] = []
         repeat {
-            guard let component = component() else {
+            guard let int = scanInt(), let component = UInt8(exactly: int) else {
                 return nil
             }
             result.append(component)
         } while string(",")
         return result
     }
-
-    func component() -> UInt8? {
-        guard var int = scanInt() else {
-            return nil
-        }
-
-        if string("%") {
-            guard 0...100 ~= int else { return nil }
-            int = int * 0xFF / 100
-        }
-
-        return UInt8(exactly: int)
-    }
 }
 
 private extension Scanner {
@@ -197,7 +111,7 @@ private extension Scanner {
 }
 
 private extension CharacterSet {
-    static let hex = CharacterSet(charactersIn: "0123456789abcdefABCDEF")
+    static let hex = CharacterSet(charactersIn: "0123456789abcdef")
     static let name = alphanumerics.union(CharacterSet(charactersIn: "_/"))
 }
 

Sources/MakeColors/Importers/Figma/FigmaImporter.swift

@@ -1,151 +0,0 @@
-import Foundation
-
-enum FigmaErrors: Error {
-    case invalidUrl
-    case missingToken
-    case invalidResponse
-    case missingColor(String)
-}
-
-class FigmaImporter: Importer {
-    let key: String
-    let token: String
-    let outputName: String
-
-    required init(source: String) throws {
-        // https://www.figma.com/file/:key/:title
-        guard
-            let url = URL(string: source),
-            url.host == "www.figma.com",
-            url.pathComponents.count >= 4,
-            url.pathComponents[1] == "file"
-        else {
-            throw FigmaErrors.invalidUrl
-        }
-
-        key = url.pathComponents[2]
-        outputName = url.pathComponents[3]
-
-        guard let token = ProcessInfo.processInfo.environment["FIGMA_TOKEN"] else {
-            throw FigmaErrors.missingToken
-        }
-
-        self.token = token
-    }
-
-    func read() async throws -> [String: ColorDef] {
-        let styles = try await request(StylesResponse.self, path: "/v1/files/\(key)/styles").meta.styles
-            .filter { $0.styleType == "FILL" }
-
-        let ids = styles.map(\.nodeId).joined(separator: ",")
-
-        let nodes = try await request(
-            NodesResponse.self,
-            path: "/v1/files/\(key)/nodes",
-            query: [URLQueryItem(name: "ids", value: ids)]
-        )
-        .nodes
-
-        var result: [String: ColorDef] = [:]
-        result.reserveCapacity(styles.count)
-
-        for style in styles {
-            guard
-                let node = nodes[style.nodeId],
-                let fill = node.document.fills.first(where: { $0.type == "SOLID" })
-            else {
-                throw FigmaErrors.missingColor(style.name)
-            }
-
-            if node.document.fills.count > 1 {
-                print("Warning: Multiple fills defined for \(style.name)")
-            }
-
-            if fill.blendMode != "NORMAL" {
-                print("Warning: Blend mode \(fill.blendMode) used for \(style.name)")
-            }
-
-            guard !result.keys.contains(style.name) else {
-                throw Errors.duplicateColor(style.name)
-            }
-
-            result[style.name] = .color(Color(fill.color))
-        }
-
-        return result
-    }
-
-    func request<T: Decodable>(_: T.Type = T.self, path: String, query: [URLQueryItem]? = nil) async throws -> T {
-        var components = URLComponents()
-        components.scheme = "https"
-        components.host = "api.figma.com"
-        components.path = path
-        components.queryItems = query
-
-        guard let url = components.url else {
-            fatalError("Cannot create url. Components: \(components)")
-        }
-
-        var request = URLRequest(url: url)
-        request.setValue(token, forHTTPHeaderField: "X-Figma-Token")
-
-        let (data, response) = try await URLSession.shared.data(for: request)
-
-        guard let response = response as? HTTPURLResponse else {
-            fatalError("Non-HTTP-Response received: \(response)")
-        }
-
-        guard response.statusCode == 200 else {
-            throw FigmaErrors.invalidResponse
-        }
-
-        let decoder = JSONDecoder()
-        decoder.keyDecodingStrategy = .convertFromSnakeCase
-        return try decoder.decode(T.self, from: data)
-    }
-}
-
-struct StylesResponse: Decodable {
-    var meta: Meta
-    struct Meta: Decodable {
-        var styles: [Style]
-    }
-
-    struct Style: Decodable {
-        var nodeId: String
-        var styleType: String
-        var name: String
-        var description: String
-    }
-}
-
-struct NodesResponse: Decodable {
-    var nodes: [String: Node]
-
-    struct Node: Decodable {
-        var document: Document
-    }
-
-    struct Document: Decodable {
-        var fills: [Fill]
-    }
-
-    struct Fill: Decodable {
-        var blendMode: String
-        var type: String
-        var color: Color
-    }
-
-    struct Color: Decodable {
-        var r, g, b, a: Float
-    }
-}
-
-extension Color {
-    init(_ color: NodesResponse.Color) {
-        red = UInt8(truncatingIfNeeded: Int(color.r * 0xFF))
-        green = UInt8(truncatingIfNeeded: Int(color.g * 0xFF))
-        blue = UInt8(truncatingIfNeeded: Int(color.b * 0xFF))
-        alpha = UInt8(truncatingIfNeeded: Int(color.a * 0xFF))
-    }
-}

Sources/MakeColors/Importers/Importer.swift

@@ -1,15 +0,0 @@
-protocol Importer {
-    init(source: String) throws
-
-    func read() async throws -> [String: ColorDef]
-
-    var outputName: String { get }
-
-    static var option: String { get }
-}
-
-extension Importer {
-    static var option: String {
-        String(describing: self).droppingSuffix("Importer").lowercased()
-    }
-}

Sources/MakeColors/Importers/List/ListImporter.swift

@@ -1,38 +0,0 @@
-import Foundation
-
-struct ListImporter: Importer {
-    let input: String
-    var outputName: String
-
-    init(source: String) {
-        input = source
-        outputName = URL(fileURLWithPath: source).deletingPathExtension().lastPathComponent
-    }
-
-    func read() throws -> [String: ColorDef] {
-        let scanner = Scanner(string: try readInput())
-        scanner.charactersToBeSkipped = .whitespaces
-
-        return try scanner.colorList()
-    }
-
-    func readInput() throws -> String {
-        if input == "-" {
-            return try readStdin()
-        }
-
-        let url = URL(fileURLWithPath: input)
-        return try String(contentsOf: url)
-    }
-
-    func readStdin() throws -> String {
-        guard
-            let data = try FileHandle.standardInput.readToEnd(),
-            let input = String(data: data, encoding: .utf8)
-        else {
-            throw Errors.cannotReadStdin
-        }
-
-        return input
-    }
-}

Sources/MakeColors/MakeColors.swift

@@ -1,150 +0,0 @@
-import ArgumentParser
-import Foundation
-
-private struct GeneratorOption: EnumerableFlag, CustomStringConvertible {
-    static let allCases: [GeneratorOption] = [
-        .init(type: AssetCatalogGenerator.self),
-        .init(type: AndroidGenerator.self),
-        .init(type: HTMLGenerator.self),
-    ]
-
-    let type: Generator.Type
-
-    var description: String {
-        type.option
-    }
-
-    static func == (lhs: GeneratorOption, rhs: GeneratorOption) -> Bool {
-        lhs.type == rhs.type
-    }
-}
-
-private struct ImporterOption: CaseIterable, ExpressibleByArgument, CustomStringConvertible {
-    static let allCases: [ImporterOption] = [
-        .list,
-        .init(type: FigmaImporter.self),
-    ]
-
-    static let list = ImporterOption(type: ListImporter.self)
-
-    let type: Importer.Type
-
-    init(type: Importer.Type) {
-        self.type = type
-    }
-
-    init?(argument: String) {
-        guard
-            let found = Self.allCases
-                .first(where: { $0.description.caseInsensitiveCompare(argument) == .orderedSame })
-        else {
-            return nil
-        }
-        self = found
-    }
-
-    var description: String {
-        type.option
-    }
-
-    static func == (lhs: ImporterOption, rhs: ImporterOption) -> Bool {
-        lhs.type == rhs.type
-    }
-}
-
-enum Errors: Error {
-    case syntaxError
-    case duplicateColor(String)
-    case missingReference(String)
-    case cyclicReference(String)
-    case cannotWriteWrapperToStdout
-    case cannotReadStdin
-}
-
-enum HelpTexts {
-    static let input = ArgumentHelp(
-        "The color list to process.",
-        discussion: """
-        Use - to process the standard input.
-        """
-    )
-
-    static let output = ArgumentHelp(
-        "Output file to write.",
-        discussion: """
-        Use - for standard output.
-        Default is the input file name with the appropriate file extension. \
-        If the input is - the default is standard output.
-        Note that asset catalogs cannot be written to standard output.
-        """
-    )
-}
-
-@main
-public final class MakeColors: AsyncParsableCommand, Context {
-    @Argument(help: HelpTexts.input)
-    var input: String
-
-    @Flag(help: "The formatter to use.")
-    private var formatter = GeneratorOption.allCases[0]
-
-    @Option(help: "The importer to use.")
-    private var importer = ImporterOption.list
-
-    @Option(help: "Prefix for color names.")
-    var prefix: String?
-
-    @Option(help: HelpTexts.output)
-    var output: String?
-
-    @Flag(help: "List read colors on console.")
-    var dump = false
-
-    public init() {}
-
-    public func run() async throws {
-        let importer = try importer.type.init(source: input)
-        let data = try await importer.read()
-
-        if dump {
-            try dump(data: data)
-        }
-
-        let generator = formatter.type.init(context: self)
-        let fileWrapper = try generator.generate(data: data)
-
-        try writeOutput(fileWrapper, name: output ?? "\(importer.outputName).\(formatter.type.defaultExtension)")
-    }
-
-    func dump(data: [String: ColorDef]) throws {
-        for (key, color) in data.sorted() {
-            let resolved = try data.resolve(key)
-            switch color {
-            case .color:
-                print(key.insertCamelCaseSeparators(), resolved, separator: ": ")
-
-            case let .reference(referenced):
-                print(
-                    "\(key.insertCamelCaseSeparators()) (@\(referenced.insertCamelCaseSeparators()))",
-                    resolved,
-                    separator: ": "
-                )
-            }
-        }
-    }
-
-    func writeOutput(_ wrapper: FileWrapper, name: String) throws {
-        if shouldWriteToStdout {
-            guard wrapper.isRegularFile, let contents = wrapper.regularFileContents else {
-                throw Errors.cannotWriteWrapperToStdout
-            }
-
-            FileHandle.standardOutput.write(contents)
-        } else {
-            let writeURL = URL(fileURLWithPath: name)
-            try wrapper.write(to: writeURL, options: .atomic, originalContentsURL: nil)
-        }
-    }
-
-    var shouldWriteToStdout: Bool { output == "-" || (input == "-" && output == nil) }
-}

Sources/MakeColors/Model/Color+HSV.swift

@@ -1,45 +0,0 @@
-extension Color {
-    init(hue: Int, saturation: UInt8, value: UInt8, alpha: UInt8 = 0xFF) {
-        let degrees = abs(hue % 360)
-
-        let saturation = Double(saturation) / 0xFF
-        let value = Double(value) / 0xFF
-
-        // swiftlint:disable identifier_name - Wish I knew what these actually mean.
-        let C = saturation * value
-        let X = C * (1 - abs((Double(degrees) / 60).truncatingRemainder(dividingBy: 2) - 1))
-        let m = value - C
-        // swiftlint:enable identifier_name
-
-        let result: (r: Double, g: Double, b: Double)
-        switch degrees {
-        case 0..<60:
-            result = (C, X, 0)
-
-        case 60..<120:
-            result = (X, C, 0)
-
-        case 120..<180:
-            result = (0, C, X)
-
-        case 180..<240:
-            result = (0, X, C)
-
-        case 240..<300:
-            result = (X, 0, C)
-
-        case 300..<360:
-            result = (C, 0, X)
-
-        default:
-            fatalError("Degrees out of range")
-        }
-
-        self.init(
-            red: UInt8(((result.r + m) * 0xFF).rounded()),
-            green: UInt8(((result.g + m) * 0xFF).rounded()),
-            blue: UInt8(((result.b + m) * 0xFF).rounded()),
-            alpha: alpha
-        )
-    }
-}

Sources/MakeColors/main.swift

@@ -0,0 +1,3 @@
+import LibMakeColors
+
+MakeColors.main()

Tests/MakeColorsTests/AssetCatalogFormattingTest.swift

@@ -1,26 +0,0 @@
-@testable import MakeColors
-import RBBJSON
-import XCTest
-
-class AssetCatalogFormattingTest: XCTestCase {
-    func testColorProducedValidJSON() throws {
-        let color = Color(red: 0xFF, green: 0xF0, blue: 0x0F)
-        let data = Data(color.json().utf8)
-
-        let json = try JSONDecoder().decode(RBBJSON.self, from: data)
-
-        XCTAssertEqual(json.info.author, .string("de.5sw.MakeColors"))
-        XCTAssertEqual(json.info.version, .number(1))
-
-        XCTAssertEqual(Array(json.colors[any: .child]).count, 1)
-
-        XCTAssertEqual(json.colors[0].idiom, .string("universal"))
-
-        let jsonColor = json.colors[0].color
-        XCTAssertEqual(jsonColor["color-space"], .string("srgb"))
-        XCTAssertEqual(jsonColor.components.alpha, .string("1.0"))
-        XCTAssertEqual(jsonColor.components.red, .string("0xFF"))
-        XCTAssertEqual(jsonColor.components.green, .string("0xF0"))
-        XCTAssertEqual(jsonColor.components.blue, .string("0x0F"))
-    }
-}

Tests/MakeColorsTests/ColorHSVTest.swift

@@ -1,39 +0,0 @@
-@testable import MakeColors
-import XCTest
-
-final class ColorHSVTest: XCTestCase {
-    func testHSV0Degrees() {
-        let color = Color(hue: 0, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0xFF, green: 0, blue: 0))
-    }
-
-    func testHSV60Degrees() {
-        let color = Color(hue: 60, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0xFF, green: 0xFF, blue: 0))
-    }
-
-    func testHSV120Degrees() {
-        let color = Color(hue: 120, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0, green: 0xFF, blue: 0))
-    }
-
-    func testHSV180Degrees() {
-        let color = Color(hue: 180, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0, green: 0xFF, blue: 0xFF))
-    }
-
-    func testHSV240Degrees() {
-        let color = Color(hue: 240, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0, green: 0, blue: 0xFF))
-    }
-
-    func testHSV300Degrees() {
-        let color = Color(hue: 300, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0xFF, green: 0, blue: 0xFF))
-    }
-
-    func testHSV360Degrees() {
-        let color = Color(hue: 360, saturation: 0xFF, value: 0xFF)
-        XCTAssertEqual(color, Color(red: 0xFF, green: 0, blue: 0))
-    }
-}

Tests/MakeColorsTests/ColorParserTest.swift

@@ -1,123 +1,40 @@
-@testable import MakeColors
+@testable import LibMakeColors
 import XCTest
 
 final class ColorParserTest: XCTestCase {
     func testScanningThreeDigitColor() throws {
-        let color = scanColor("#abc")
-        XCTAssertEqual(Color(red: 0xAA, green: 0xBB, blue: 0xCC), color)
-    }
-
-    func testScanningThreeDigitColorUppercase() throws {
-        let color = scanColor("#ABc")
+        let scanner = Scanner(string: "#abc")
+        let color = scanner.color()
         XCTAssertEqual(Color(red: 0xAA, green: 0xBB, blue: 0xCC), color)
     }
 
     func testScanningFourDigitColor() throws {
-        let color = scanColor("#abcd")
+        let scanner = Scanner(string: "#abcd")
+        let color = scanner.color()
         XCTAssertEqual(Color(red: 0xAA, green: 0xBB, blue: 0xCC, alpha: 0xDD), color)
     }
 
     func testScanningSixDigitColor() throws {
-        let color = scanColor("#abcdef")
+        let scanner = Scanner(string: "#abcdef")
+        let color = scanner.color()
         XCTAssertEqual(Color(red: 0xAB, green: 0xCD, blue: 0xEF), color)
     }
 
     func testScanningEightDigitColor() throws {
-        let color = scanColor("#abcdef17")
+        let scanner = Scanner(string: "#abcdef17")
+        let color = scanner.color()
         XCTAssertEqual(Color(red: 0xAB, green: 0xCD, blue: 0xEF, alpha: 0x17), color)
     }
 
     func testScanningRGBColor() throws {
-        let color = scanColor("rgb(1,2,3)")
+        let scanner = Scanner(string: "rgb(1,2,3)")
+        let color = scanner.color()
         XCTAssertEqual(Color(red: 1, green: 2, blue: 3), color)
     }
 
     func testScanningRGBAColor() throws {
-        let color = scanColor("rgba(1,2,3,4)")
+        let scanner = Scanner(string: "rgba(1,2,3,4)")
+        let color = scanner.color()
         XCTAssertEqual(Color(red: 1, green: 2, blue: 3, alpha: 4), color)
     }
-
-    func testScanningWhite() throws {
-        let color = scanColor("white(255)")
-        XCTAssertEqual(Color(red: 255, green: 255, blue: 255, alpha: 255), color)
-    }
-
-    func testScanningWhiteWithAlpha() throws {
-        let color = scanColor("white(255, 128)")
-        XCTAssertEqual(Color(red: 255, green: 255, blue: 255, alpha: 128), color)
-    }
-
-    func testWhiteFailsWithoutArguments() throws {
-        let color = scanColor("white()")
-        XCTAssertNil(color)
-    }
-
-    func testWhiteFailsWith3Arguments() throws {
-        let color = scanColor("white(1,2,3)")
-        XCTAssertNil(color)
-    }
-
-    func testScanningColorWithPercentage() throws {
-        let color = scanColor("rgba(100%, 0, 50%, 100%)")
-        XCTAssertEqual(color, Color(red: 255, green: 0, blue: 127, alpha: 255))
-    }
-
-    func testReadingComponentAsByte() throws {
-        let scanner = Scanner(string: "128")
-        XCTAssertEqual(scanner.component(), 128)
-        XCTAssertTrue(scanner.isAtEnd)
-    }
-
-    func testReadingComponentAs100Percent() throws {
-        let scanner = Scanner(string: "100%")
-        XCTAssertEqual(scanner.component(), 0xFF)
-        XCTAssertTrue(scanner.isAtEnd)
-    }
-
-    func testReadingComponentAs0Percent() throws {
-        let scanner = Scanner(string: "0%")
-        XCTAssertEqual(scanner.component(), 0)
-        XCTAssertTrue(scanner.isAtEnd)
-    }
-
-    func testReadingComponentAs50PercentRoundsDown() throws {
-        let scanner = Scanner(string: "50%")
-        XCTAssertEqual(scanner.component(), 127)
-        XCTAssertTrue(scanner.isAtEnd)
-    }
-
-    func testScanningDegreesAsByte() throws {
-        let scanner = Scanner(string: "128")
-        XCTAssertEqual(scanner.degrees(), 180)
-    }
-
-    func testScanningDegreesAsPercentage() throws {
-        let scanner = Scanner(string: "50%")
-        XCTAssertEqual(scanner.degrees(), 180)
-    }
-
-    func testScanningDegrees() throws {
-        let scanner = Scanner(string: "120°")
-        XCTAssertEqual(scanner.degrees(), 120)
-    }
-
-    func testScanningDegreesWithDegSuffix() throws {
-        let scanner = Scanner(string: "120 deg")
-        XCTAssertEqual(scanner.degrees(), 120)
-    }
-
-    func testScanningHSVColor() throws {
-        XCTAssertEqual(scanColor("hsv(60°, 255, 100%)"), Color(red: 0xFF, green: 0xFF, blue: 0))
-    }
-
-    func testScanningHSVAColor() throws {
-        XCTAssertEqual(scanColor("hsva(60°, 50%, 255, 99)"), Color(red: 0xFF, green: 0xFF, blue: 128, alpha: 99))
-    }
-
-    private func scanColor(_ input: String) -> Color? {
-        let scanner = Scanner(string: input)
-        let result = scanner.color()
-        XCTAssertTrue(result == nil || scanner.isAtEnd)
-        return result
-    }
 }