Restructure solution a bit

src/Spectre.Console/Extensions/GridExtensions.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Linq;
+using Spectre.Console.Internal;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="Grid"/>.
+    /// </summary>
+    public static class GridExtensions
+    {
+        /// <summary>
+        /// Adds a column to the grid.
+        /// </summary>
+        /// <param name="grid">The grid to add the column to.</param>
+        /// <param name="count">The number of columns to add.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static Grid AddColumns(this Grid grid, int count)
+        {
+            if (grid is null)
+            {
+                throw new ArgumentNullException(nameof(grid));
+            }
+
+            for (var index = 0; index < count; index++)
+            {
+                grid.AddColumn(new GridColumn());
+            }
+
+            return grid;
+        }
+
+        /// <summary>
+        /// Adds a column to the grid.
+        /// </summary>
+        /// <param name="grid">The grid to add the column to.</param>
+        /// <param name="columns">The columns to add.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static Grid AddColumns(this Grid grid, params GridColumn[] columns)
+        {
+            if (grid is null)
+            {
+                throw new ArgumentNullException(nameof(grid));
+            }
+
+            if (columns is null)
+            {
+                throw new ArgumentNullException(nameof(columns));
+            }
+
+            foreach (var column in columns)
+            {
+                grid.AddColumn(column);
+            }
+
+            return grid;
+        }
+
+        /// <summary>
+        /// Adds an empty row to the grid.
+        /// </summary>
+        /// <param name="grid">The grid to add the row to.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static Grid AddEmptyRow(this Grid grid)
+        {
+            if (grid is null)
+            {
+                throw new ArgumentNullException(nameof(grid));
+            }
+
+            var columns = new IRenderable[grid.ColumnCount];
+            Enumerable.Range(0, grid.ColumnCount).ForEach(index => columns[index] = Text.Empty);
+            grid.AddRow(columns);
+
+            return grid;
+        }
+
+        /// <summary>
+        /// Adds a new row to the grid.
+        /// </summary>
+        /// <param name="grid">The grid to add the row to.</param>
+        /// <param name="columns">The columns to add.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static Grid AddRow(this Grid grid, params string[] columns)
+        {
+            if (grid is null)
+            {
+                throw new ArgumentNullException(nameof(grid));
+            }
+
+            if (columns is null)
+            {
+                throw new ArgumentNullException(nameof(columns));
+            }
+
+            grid.AddRow(columns.Select(column => new Markup(column)).ToArray());
+            return grid;
+        }
+    }
+}