feat: Initial commit

Sources/CliDoc/Modifiers/LabelColor.swift

@@ -0,0 +1,59 @@
+import Rainbow
+
+public extension Group {
+  func labelColor(_ color: NamedColor) -> some Node {
+    modifier(GroupLabelModifier(color: color))
+  }
+}
+
+public extension Node where Self.Body == Group {
+  func labelColor(_ color: NamedColor) -> some Node {
+    body.modifier(GroupLabelModifier(color: color))
+  }
+}
+
+public extension Node where Self == Label {
+  func labelColor(_ color: NamedColor) -> some Node {
+    modifier(LabelColorModifier(color: color))
+  }
+}
+
+public extension Note where Label == CliDoc.Label {
+  func labelColor(_ color: NamedColor) -> some Node {
+    var node = self
+    node.label.color = color
+    return node
+  }
+}
+
+struct LabelColorModifier: NodeModifier {
+  let color: NamedColor
+
+  func render(content: Label) -> some Node {
+    var label = content
+    label.color = color
+    return label
+  }
+}
+
+struct GroupLabelModifier: NodeModifier {
+  let color: NamedColor
+
+  func render(content: Group) -> some Node {
+    var group = content
+    applyLabelColor(&group)
+    return group
+  }
+
+  private func applyLabelColor(_ group: inout Group) {
+    for (idx, node) in group.nodes.enumerated() {
+      if var label = node as? Label {
+        label.color = color
+        group.nodes[idx] = label
+      } else if var nestedGroup = node as? Group {
+        applyLabelColor(&nestedGroup)
+        group.nodes[idx] = nestedGroup
+      }
+    }
+  }
+}