feat: Initial commit

Sources/CliDoc/NodeBuilder.swift

@@ -0,0 +1,36 @@
+@resultBuilder
+public enum NodeBuilder {
+
+  public static func buildPartialBlock<N: Node>(first: N) -> N {
+    first
+  }
+
+  public static func buildArray<N: Node>(_ components: [N]) -> Group {
+    .init(components)
+  }
+
+  public static func buildOptional<N: Node>(_ component: N?) -> OptionalNode<N> {
+    .init(component: component)
+  }
+
+  public static func buildEither<N: Node>(first component: N) -> N {
+    component
+  }
+
+  public static func buildEither<N: Node>(second component: N) -> N {
+    component
+  }
+
+  public static func buildPartialBlock<N0: Node, N1: Node>(accumulated: N0, next: N1) -> Group {
+    .init([accumulated, next])
+  }
+
+}
+
+public struct OptionalNode<N: Node>: Node {
+  let component: N?
+
+  public var body: some Node {
+    component?.render() ?? ""
+  }
+}