Add set-solid-color command (#30)

Sources/WallpaperCLI/main.swift

@@ -76,6 +76,25 @@ final class SetCommand: Command {
 	}
 }
 
+final class SetSolidColorCommand: Command {
+	let name = "set-solid-color"
+	let shortDescription = "Set solid color wallpaper background"
+	let color = Parameter()
+	let screen = Key<String>("--screen", description: "Values: all, main, <index> [Default: all]")
+
+	func execute() throws {
+		guard let color = NSColor(hexString: color.value) else {
+			print("Invalid `color` value", to: .standardError)
+			exit(1)
+		}
+
+		try Wallpaper.set(
+			color,
+			screen: convertStringToScreen(screen.value)
+		)
+	}
+}
+
 final class GetCommand: Command {
 	let name = "get"
 	let shortDescription = "Get current wallpaper image"
@@ -105,6 +124,7 @@ let cli = CLI(
 
 cli.commands = [
 	SetCommand(),
+	SetSolidColorCommand(),
 	GetCommand(),
 	ScreensCommand()
 ]

Sources/wallpaper/Wallpaper.swift

@@ -112,6 +112,13 @@ public struct Wallpaper {
 		}
 	}
 
+	/// Set a solid color as wallpaper.
+	public static func set(_ solidColor: NSColor, screen: Screen = .all) throws {
+		let transparentImage = URL(fileURLWithPath: "/System/Library/PreferencePanes/DesktopScreenEffectsPref.prefPane/Contents/Resources/DesktopPictures.prefPane/Contents/Resources/Transparent.tiff")
+
+		try set(transparentImage, screen: screen, scale: .fit, fillColor: solidColor)
+	}
+
 	/// Names of available screens.
 	public static var screenNames: [String] {
 		NSScreen.screens.map(\.name)

readme.md

@@ -34,11 +34,12 @@ Usage: wallpaper <command> [options]
 Manage the desktop wallpaper
 
 Commands:
-  set             Set wallpaper image
-  get             Get current wallpaper image
-  screens         List screens
-  help            Prints help information
-  version         Prints the current version of this app
+  set               Set wallpaper image
+  set-solid-color   Set solid color wallpaper background
+  get               Get current wallpaper image
+  screens           List screens
+  help              Prints help information
+  version           Prints the current version of this app
 ```
 
 ```
@@ -67,12 +68,30 @@ Options:
   -h, --help              Show help information
 ```
 
+```
+$ wallpaper set-solid-color --help
+
+Usage: wallpaper set-solid-color <color> [options]
+
+Set solid color wallpaper background
+
+Options:
+  --screen <value>        Values: all, main, <index> [Default: all]
+  -h, --help              Show help information
+```
+
 ##### Set
 
 ```
 $ wallpaper set unicorn.jpg
 ```
 
+##### Set solid color
+
+```
+$ wallpaper set-solid-color 0000ff
+```
+
 ##### Get
 
 ```
@@ -96,9 +115,12 @@ Swift Package Manager:
 import Wallpaper
 
 let imageURL = URL(fileURLWithPath: "<path>")
+let solidColor = NSColor.blue
 
 try! Wallpaper.set(imageURL, screen: .main, scale: .fill, fillColor: NSColor.blue)
 
+try! Wallpaper.set(solidColor, screen: .main)
+
 print(try! Wallpaper.get(screen: .main))
 ```