munin: drop Rainbow, inline ANSI for diff markers

Rainbow pulled a whole package just for `"[+]".green` and `"[-]".red`
in prettyPrintAdded/Removed. Replace with three inline ANSI escape
constants — prettyPrintAlbum already goes through `print(...)` so
there was never a colour-aware abstraction to preserve. One fewer
third-party dep, same terminal output.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kradalby

FUTURES.md

@@ -169,17 +169,7 @@ cut upstream:
 
 ---
 
-## 12. Consolidate Rainbow vs. ConsoleKit
-
-Both `onevcat/Rainbow` and `vapor/console-kit` provide terminal colour
-APIs. Today Rainbow is used only in `Utils.swift` for `prettyPrintAdded`
-(green `+`) and `prettyPrintRemoved` (red `-`). Migrating those to
-ConsoleKit would let us drop Rainbow entirely, removing a dependency for
-trivial gain.
-
----
-
-## 13. Static binary distribution
+## 12. Static binary distribution
 
 `make build-static` uses `--static-swift-stdlib` which produces a ~73 MB
 binary with no Swift-runtime `.so` dependencies but still depends on the

Package.resolved

@@ -41,7 +41,6 @@ let package = Package(
       url: "https://github.com/kradalby/SwiftExif.git",
       revision: "eb7c5c4e034f0fc01c5a11b3c1d1ac3074f0acb1"),
     .package(url: "https://github.com/apple/swift-log.git", from: "1.12.0"),
-    .package(url: "https://github.com/onevcat/Rainbow.git", from: "4.0.1"),
     // vapor/console-kit provides the progress/activity indicator UI that
     // replaced swift-tools-support-core's PercentProgressAnimation.
     .package(url: "https://github.com/vapor/console-kit.git", from: "4.16.0"),
@@ -72,7 +71,6 @@ let package = Package(
         .product(name: "SystemPackage", package: "swift-system"),
         .product(name: "Crypto", package: "swift-crypto"),
         "SwiftExif",
-        "Rainbow",
       ],
       exclude: ["Templates"]
     ),

Package.swift

@@ -7,7 +7,14 @@
 
 import Foundation
 import Logging
-import Rainbow
+
+// ANSI escapes for the `--diff` pretty-print markers. `prettyPrintAlbum`
+// writes through `print(...)` which already bypasses any colour-aware
+// terminal abstraction, so keeping two local constants is simpler than
+// pulling in a colour-helper dependency.
+private let ansiGreen = "\u{001B}[32m"
+private let ansiRed = "\u{001B}[31m"
+private let ansiReset = "\u{001B}[0m"
 
 func readAndDecodeJsonFile<T>(_ type: T.Type, atPath: String) -> T?
 where T: Decodable {
@@ -136,11 +143,11 @@ func prettyPrintAlbum(_ album: Album, marker: String = "") {
 }
 
 func prettyPrintAdded(_ album: Album) {
-  prettyPrintAlbum(album, marker: "[+]".green)
+  prettyPrintAlbum(album, marker: "\(ansiGreen)[+]\(ansiReset)")
 }
 
 func prettyPrintRemoved(_ album: Album) {
-  prettyPrintAlbumCompact(album, marker: "[-]".red)
+  prettyPrintAlbumCompact(album, marker: "\(ansiRed)[-]\(ansiReset)")
 }
 
 func prettyPrintAlbumCompact(_ album: Album, marker: String) {