feat: Adds extension to argument parser's command configuration

Sources/CliDoc/CommandConfiguration+TextNode.swift

@@ -0,0 +1,36 @@
+import ArgumentParser
+
+public extension CommandConfiguration {
+
+  /// Generate a new command configuration, using ``TextNode``'s for the abstract,
+  /// usage, and discussion parameters.
+  ///
+  ///
+  init<A: TextNode, U: TextNode, D: TextNode>(
+    commandName: String? = nil,
+    abstract: Abstract<A>,
+    usage: Usage<U>,
+    discussion: Discussion<D>,
+    version: String = "",
+    shouldDisplay: Bool = true,
+    subcommands ungroupedSubcommands: [ParsableCommand.Type] = [],
+    groupedSubcommands: [CommandGroup] = [],
+    defaultSubcommand: ParsableCommand.Type? = nil,
+    helpNames: NameSpecification? = nil,
+    aliases: [String] = []
+  ) {
+    self.init(
+      commandName: commandName,
+      abstract: abstract.render(),
+      usage: usage.render(),
+      discussion: discussion.render(),
+      version: version,
+      shouldDisplay: shouldDisplay,
+      subcommands: ungroupedSubcommands,
+      groupedSubcommands: groupedSubcommands,
+      defaultSubcommand: defaultSubcommand,
+      helpNames: helpNames,
+      aliases: aliases
+    )
+  }
+}

Sources/CliDoc/Nodes/Abstract.swift

@@ -0,0 +1,14 @@
+import CliDocCore
+
+public struct Abstract<Content: TextNode>: TextNode {
+  @usableFromInline
+  let content: Content
+
+  public init(@TextBuilder content: () -> Content) {
+    self.content = content()
+  }
+
+  public var body: some TextNode {
+    content
+  }
+}

Sources/CliDoc/Nodes/Discussion.swift

@@ -0,0 +1,14 @@
+import CliDocCore
+
+public struct Discussion<Content: TextNode>: TextNode {
+  @usableFromInline
+  let content: Content
+
+  public init(@TextBuilder content: () -> Content) {
+    self.content = content()
+  }
+
+  public var body: some TextNode {
+    content
+  }
+}

Sources/CliDoc/Nodes/Note.swift

@@ -1,6 +1,7 @@
 import CliDocCore
 import Rainbow
 
+// TODO: Use labeled content.
 public struct Note<Label: TextNode, Content: TextNode>: TextNode {
   @usableFromInline
   let label: Label

Sources/CliDoc/Nodes/Usage.swift

@@ -0,0 +1,14 @@
+import CliDocCore
+
+public struct Usage<Content: TextNode>: TextNode {
+  @usableFromInline
+  let content: Content
+
+  public init(@TextBuilder content: () -> Content) {
+    self.content = content()
+  }
+
+  public var body: some TextNode {
+    content
+  }
+}