Move Spectre.Console.Cli to it's own package

src/Spectre.Console.Cli/Annotations/CommandOptionAttribute.cs

@@ -0,0 +1,65 @@
+namespace Spectre.Console.Cli;
+
+/// <summary>
+/// An attribute representing a command option.
+/// </summary>
+/// <seealso cref="Attribute" />
+[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
+public sealed class CommandOptionAttribute : Attribute
+{
+    /// <summary>
+    /// Gets the long names of the option.
+    /// </summary>
+    /// <value>The option's long names.</value>
+    public IReadOnlyList<string> LongNames { get; }
+
+    /// <summary>
+    /// Gets the short names of the option.
+    /// </summary>
+    /// <value>The option's short names.</value>
+    public IReadOnlyList<string> ShortNames { get; }
+
+    /// <summary>
+    /// Gets the value name of the option.
+    /// </summary>
+    /// <value>The option's value name.</value>
+    public string? ValueName { get; }
+
+    /// <summary>
+    /// Gets a value indicating whether the value is optional.
+    /// </summary>
+    public bool ValueIsOptional { get; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether this option is hidden from the help text.
+    /// </summary>
+    public bool IsHidden { get; set; }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CommandOptionAttribute"/> class.
+    /// </summary>
+    /// <param name="template">The option template.</param>
+    public CommandOptionAttribute(string template)
+    {
+        if (template == null)
+        {
+            throw new ArgumentNullException(nameof(template));
+        }
+
+        // Parse the option template.
+        var result = TemplateParser.ParseOptionTemplate(template);
+
+        // Assign the result.
+        LongNames = result.LongNames;
+        ShortNames = result.ShortNames;
+        ValueName = result.Value;
+        ValueIsOptional = result.ValueIsOptional;
+    }
+
+    internal bool IsMatch(string name)
+    {
+        return
+            ShortNames.Contains(name, StringComparer.Ordinal) ||
+            LongNames.Contains(name, StringComparer.Ordinal);
+    }
+}