1 files changed, 117 insertions, 0 deletions
diff --git a/src/StardewModdingAPI/Framework/CommandManager.cs b/src/StardewModdingAPI/Framework/CommandManager.cs
new file mode 100644
index 00000000..9af3d27a
--- /dev/null
+++ b/src/StardewModdingAPI/Framework/CommandManager.cs
@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace StardewModdingAPI.Framework
+{
+    /// <summary>Manages console commands.</summary>
+    internal class CommandManager
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The commands registered with SMAPI.</summary>
+        private readonly IDictionary<string, Command> Commands = new Dictionary<string, Command>(StringComparer.InvariantCultureIgnoreCase);
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Add a console command.</summary>
+        /// <param name="modName">The friendly mod name for this instance.</param>
+        /// <param name="name">The command name, which the user must type to trigger it.</param>
+        /// <param name="documentation">The human-readable documentation shown when the player runs the built-in 'help' command.</param>
+        /// <param name="callback">The method to invoke when the command is triggered. This method is passed the command name and arguments submitted by the user.</param>
+        /// <param name="allowNullCallback">Whether to allow a null <paramref name="callback"/> argument; this should only used for backwards compatibility.</param>
+        /// <exception cref="ArgumentNullException">The <paramref name="name"/> or <paramref name="callback"/> is null or empty.</exception>
+        /// <exception cref="FormatException">The <paramref name="name"/> is not a valid format.</exception>
+        /// <exception cref="ArgumentException">There's already a command with that name.</exception>
+        public void Add(string modName, string name, string documentation, Action<string, string[]> callback, bool allowNullCallback = false)
+        {
+            name = this.GetNormalisedName(name);
+
+            // validate format
+            if (string.IsNullOrWhiteSpace(name))
+                throw new ArgumentNullException(nameof(name), "Can't register a command with no name.");
+            if (name.Any(char.IsWhiteSpace))
+                throw new FormatException($"Can't register the '{name}' command because the name can't contain whitespace.");
+            if (callback == null && !allowNullCallback)
+                throw new ArgumentNullException(nameof(callback), $"Can't register the '{name}' command because without a callback.");
+
+            // ensure uniqueness
+            if (this.Commands.ContainsKey(name))
+                throw new ArgumentException(nameof(callback), $"Can't register the '{name}' command because there's already a command with that name.");
+
+            // add command
+            this.Commands.Add(name, new Command(modName, name, documentation, callback));
+        }
+
+        /// <summary>Get a command by its unique name.</summary>
+        /// <param name="name">The command name.</param>
+        /// <returns>Returns the matching command, or <c>null</c> if not found.</returns>
+        public Command Get(string name)
+        {
+            name = this.GetNormalisedName(name);
+            Command command;
+            this.Commands.TryGetValue(name, out command);
+            return command;
+        }
+
+        /// <summary>Get all registered commands.</summary>
+        public IEnumerable<Command> GetAll()
+        {
+            return this.Commands
+                .Values
+                .OrderBy(p => p.Name);
+        }
+
+        /// <summary>Trigger a command.</summary>
+        /// <param name="input">The raw command input.</param>
+        /// <returns>Returns whether a matching command was triggered.</returns>
+        public bool Trigger(string input)
+        {
+            if (string.IsNullOrWhiteSpace(input))
+                return false;
+
+            string[] args = input.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
+            string name = args[0];
+            args = args.Skip(1).ToArray();
+
+            return this.Trigger(name, args);
+        }
+
+        /// <summary>Trigger a command.</summary>
+        /// <param name="name">The command name.</param>
+        /// <param name="arguments">The command arguments.</param>
+        /// <returns>Returns whether a matching command was triggered.</returns>
+        public bool Trigger(string name, string[] arguments)
+        {
+            // get normalised name
+            name = this.GetNormalisedName(name);
+            if (name == null)
+                return false;
+
+            // get command
+            Command command;
+            if (this.Commands.TryGetValue(name, out command))
+            {
+                command.Callback.Invoke(name, arguments);
+                return true;
+            }
+            return false;
+        }
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Get a normalised command name.</summary>
+        /// <param name="name">The command name.</param>
+        private string GetNormalisedName(string name)
+        {
+            name = name?.Trim().ToLower();
+            return !string.IsNullOrWhiteSpace(name)
+                ? name
+                : null;
+        }
+    }
+}
+\ No newline at end of file