feat: Working on node builder

Sources/CliDoc/ArgumentParserExtensions/Abstract.swift

@@ -0,0 +1,16 @@
+/// Use the `NodeBuilder` for generating an abstract.
+public struct Abstract: NodeRepresentable {
+  @usableFromInline
+  let label: any NodeRepresentable
+
+  @inlinable
+  public init(@NodeBuilder label: () -> any NodeRepresentable) {
+    self.label = label()
+  }
+
+  @inlinable
+  public func render() -> String {
+    label.render()
+  }
+
+}

Sources/CliDoc/ArgumentParserExtensions/CommandConfiguration+NodeBuilder.swift

@@ -0,0 +1,32 @@
+import ArgumentParser
+
+public extension CommandConfiguration {
+
+  init(
+    commandName: String? = nil,
+    abstract: Abstract,
+    usage: String? = nil,
+    discussion: Discussion,
+    version: String = "",
+    shouldDisplay: Bool = true,
+    subcommands: [any ParsableCommand.Type] = [],
+    groupedSubcommands: [CommandGroup] = [],
+    defaultSubcommand: ParsableCommand.Type? = nil,
+    helpNames: NameSpecification? = nil,
+    aliases: [String] = []
+  ) {
+    self.init(
+      commandName: commandName,
+      abstract: abstract.render(),
+      usage: usage,
+      discussion: discussion.render(),
+      version: version,
+      shouldDisplay: shouldDisplay,
+      subcommands: subcommands,
+      groupedSubcommands: groupedSubcommands,
+      defaultSubcommand: defaultSubcommand,
+      helpNames: helpNames,
+      aliases: aliases
+    )
+  }
+}

Sources/CliDoc/ArgumentParserExtensions/Discussion.swift

@@ -0,0 +1,16 @@
+/// Use the `NodeBuilder` for generating a discussion.
+public struct Discussion: NodeRepresentable {
+  @usableFromInline
+  let label: any NodeRepresentable
+
+  @inlinable
+  public init(@NodeBuilder label: () -> any NodeRepresentable) {
+    self.label = label()
+  }
+
+  @inlinable
+  public func render() -> String {
+    label.render()
+  }
+
+}