Add Argument conveniences

Author: finestructure

Sources/Argument.swift

@@ -1,3 +1,6 @@
+import Foundation
+
+
 public enum Argument {
     case quoted(QuotedString)
     case verbatim(String)
@@ -21,11 +24,23 @@ public enum Argument {
 }
 
 
+extension Argument: ExpressibleByStringLiteral {
+    public init(stringLiteral value: StringLiteralType) {
+        self = .quoted(.init(value))
+    }
+}
+
+
 extension Argument: CustomStringConvertible {
     public var description: String { string }
 }
 
 
+extension Argument {
+    public static func url(_ url: URL) -> Self { url.absoluteString.verbatim }
+}
+
+
 extension String {
     public var quoted: Argument { .init(quoted: self) }
     public var verbatim: Argument { .init(verbatim: self) }

Tests/ShellOutTests/ShellOutTests.swift

@@ -215,4 +215,14 @@ class ShellOutTests: XCTestCase {
                                     arguments: ["foo ; echo bar".verbatim]),
                        "foo\nbar")
     }
+
+    func test_Argument_ExpressibleByStringLiteral() throws {
+        XCTAssertEqual(("foo" as Argument).string, "foo")
+        XCTAssertEqual(("foo bar" as Argument).string, "'foo bar'")
+    }
+
+    func test_Argument_url() throws {
+        XCTAssertEqual(Argument.url(.init(string: "https://example.com")!).string,
+                       "https://example.com")
+    }
 }