Temp commit of working state

This will allow setting up arbitrary test cases when writing test scripts

.vscode/launch.json

@@ -0,0 +1,27 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceFolder}/MultiversalDiplomacy/bin/Debug/net6.0/MultiversalDiplomacy.dll",
+            "args": ["repl"],
+            "cwd": "${workspaceFolder}/MultiversalDiplomacy",
+            "console": "internalConsole",
+            "stopAtEntry": true
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach"
+        }
+    ],
+    "logging": {
+        "engineLogging": true
+     }
+}

.vscode/tasks.json

@@ -0,0 +1,41 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "build",
+                "${workspaceFolder}/MultiversalDiplomacy/MultiversalDiplomacy.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "publish",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "publish",
+                "${workspaceFolder}/MultiversalDiplomacy/MultiversalDiplomacy.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "watch",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "watch",
+                "run",
+                "--project",
+                "${workspaceFolder}/MultiversalDiplomacy/MultiversalDiplomacy.csproj"
+            ],
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

MultiversalDiplomacy/Adjudicate/IPhaseAdjudicator.cs

@@ -8,6 +8,18 @@ namespace MultiversalDiplomacy.Adjudicate;
 /// </summary>
 public interface IPhaseAdjudicator
 {
+    /// <summary>
+    /// Given a list of order sets, determine which entries are comprehensible as orders.
+    /// An order set entry may comprehensible as an order but not valid for the current
+    /// phase; these orders will be rejected by <see cref="ValidateOrders"/>.
+    /// </summary>
+    /// <param name="world">The global game state.</param>
+    /// <param name="orderSets">The order sets to adjudicate.</param>
+    /// <returns>
+    /// A list of <see cref="Order"/> objects representing the orders parsed.
+    /// </returns>
+    public List<Order> ParseOrderSets(World world, List<OrderSet> orderSets);
+
     /// <summary>
     /// Given a list of orders, determine which orders are valid for this adjudicator and
     /// which should be rejected before adjudication. Adjudication should be performed on

MultiversalDiplomacy/Adjudicate/MovementPhaseAdjudicator.cs

@@ -1,3 +1,5 @@
+using System.Linq;
+
 using MultiversalDiplomacy.Adjudicate.Decision;
 using MultiversalDiplomacy.Adjudicate.Logging;
 using MultiversalDiplomacy.Model;
@@ -19,6 +21,36 @@ public class MovementPhaseAdjudicator : IPhaseAdjudicator
         this.logger = logger;
     }
 
+    public List<Order> ParseOrderSets(World world, List<OrderSet> orderSets)
+    {
+        foreach (OrderSet orderSet in orderSets)
+        {
+            string[] lines = orderSet.Text.Split('\n');
+            string powerLine = lines[0];
+            // TODO verify
+            string powerName = powerLine.Substring("orders ".Length);
+
+            foreach (string line in lines.Skip(1))
+            {
+                // Individual order components do not have spaces in them
+                string[] tokens = line.Split(' ');
+                int i = 0;
+
+                // Check for a unit type
+                string[] unitTypes = new string[] { "a", "f"};
+                if (unitTypes.Contains(tokens[i].ToLowerInvariant()))
+                {
+                    // yay
+                    i++;
+                }
+
+                // 
+            }
+        }
+
+        throw new NotImplementedException();
+    }
+
     public List<OrderValidation> ValidateOrders(World world, List<Order> orders)
     {
         // The basic workflow of this function will be to look for invalid orders, remove these

MultiversalDiplomacy/GameController.cs

@@ -0,0 +1,50 @@
+using MultiversalDiplomacy.Adjudicate;
+using MultiversalDiplomacy.Model;
+using MultiversalDiplomacy.Orders;
+
+namespace MultiversalDiplomacy;
+
+/// <summary>
+/// The game controller is a stateless class that defines the basic, high-level operations that can be taken to modify
+/// the game state.
+/// </summary>
+public static class GameController
+{
+    public static World InitializeWorld()
+    {
+        return World.Standard;
+    }
+
+    public static World SubmitOrderSet(World world, string text)
+    {
+        var orderSet = new OrderSet(text);
+        return world.Update(orderSets: world.OrderSets.Append(orderSet));
+    }
+
+    public static World AdjudicateOrders(World world)
+    {
+        // Determine which phase the game is in, which determines how orders should be interpreted and adjudicated.
+        PhaseType phaseType = world.GetNextPhaseType();
+
+        IPhaseAdjudicator adjudicator = phaseType switch {
+            PhaseType.Movement => MovementPhaseAdjudicator.Instance,
+            PhaseType.Retreat => throw new NotImplementedException(),
+            PhaseType.Build => throw new NotImplementedException(),
+            PhaseType.Sustain => throw new NotImplementedException(),
+            _ => throw new InvalidOperationException(phaseType.ToString()),
+        };
+
+        // Parse the order sets into actual orders.
+        List<Order> parsedOrders = adjudicator.ParseOrderSets(world, world.OrderSets.ToList());
+
+        // Validate the orders.
+        var orderValidations = adjudicator.ValidateOrders(world, parsedOrders);
+
+        // Adjudicate the orders.
+        var validOrders = orderValidations.Where(v => v.Valid).Select(v => v.Order).ToList();
+        var results = adjudicator.AdjudicateOrders(world, validOrders);
+
+        // Update the world.
+        return adjudicator.UpdateWorld(world, results);
+    }
+}

MultiversalDiplomacy/Model/OrderSet.cs

@@ -0,0 +1,28 @@
+namespace MultiversalDiplomacy.Model;
+
+/// <summary>
+/// A list of unit orders submitted by a power.
+/// </summary>
+public class OrderSet
+{
+    /// <summary>
+    /// The raw text of the submitted orders, including the name of the submitting power.
+    /// </summary>
+    public string Text { get; }
+
+    /// <summary>
+    /// Whether the order set has already been adjudicated.
+    /// </summary>
+    public bool Adjudicated { get; }
+
+    /// <summary>
+    /// UTC timestamp at which the order set was submitted
+    /// </summary>
+    public DateTime SubmittedAt { get; }
+
+    public OrderSet(string text)
+    {
+        Text = text;
+        SubmittedAt = DateTime.UtcNow;
+    }
+}

MultiversalDiplomacy/Model/Phase.cs

@@ -0,0 +1,9 @@
+namespace MultiversalDiplomacy.Model;
+
+public enum PhaseType
+{
+    Movement = 1,
+    Retreat = 2,
+    Build = 3,
+    Sustain = 4,
+}

MultiversalDiplomacy/Model/World.cs

@@ -44,6 +44,11 @@ public class World
     /// </summary>
     public ReadOnlyDictionary<Season, OrderHistory> OrderHistory { get; }
 
+    /// <summary>
+    /// Submitted order sets.
+    /// </summary>
+    public ReadOnlyCollection<OrderSet> OrderSets { get; }
+
     /// <summary>
     /// Immutable game options.
     /// </summary>
@@ -60,6 +65,7 @@ public class World
         ReadOnlyCollection<Unit> units,
         ReadOnlyCollection<RetreatingUnit> retreatingUnits,
         ReadOnlyDictionary<Season, OrderHistory> orderHistory,
+        ReadOnlyCollection<OrderSet> orderSets,
         Options options)
     {
         this.Provinces = provinces;
@@ -69,6 +75,7 @@ public class World
         this.Units = units;
         this.RetreatingUnits = retreatingUnits;
         this.OrderHistory = orderHistory;
+        this.OrderSets = orderSets;
         this.Options = options;
     }
 
@@ -83,6 +90,7 @@ public class World
         ReadOnlyCollection<Unit>? units = null,
         ReadOnlyCollection<RetreatingUnit>? retreatingUnits = null,
         ReadOnlyDictionary<Season, OrderHistory>? orderHistory = null,
+        ReadOnlyCollection<OrderSet>? orderSets = null,
         Options? options = null)
         : this(
             provinces ?? previous.Provinces,
@@ -92,6 +100,7 @@ public class World
             units ?? previous.Units,
             retreatingUnits ?? previous.RetreatingUnits,
             orderHistory ?? previous.OrderHistory,
+            orderSets ?? previous.OrderSets,
             options ?? previous.Options)
     {
     }
@@ -110,6 +119,7 @@ public class World
             new(new List<Unit>()),
             new(new List<RetreatingUnit>()),
             new(new Dictionary<Season, OrderHistory>()),
+            new(new List<OrderSet>()),
             new Options());
     }
 
@@ -123,7 +133,8 @@ public class World
         IEnumerable<Season>? seasons = null,
         IEnumerable<Unit>? units = null,
         IEnumerable<RetreatingUnit>? retreats = null,
-        IEnumerable<KeyValuePair<Season, OrderHistory>>? orders = null)
+        IEnumerable<KeyValuePair<Season, OrderHistory>>? orders = null,
+        IEnumerable<OrderSet>? orderSets = null)
         => new World(
             previous: this,
             seasons: seasons == null
@@ -137,7 +148,10 @@ public class World
                 : new(retreats.ToList()),
             orderHistory: orders == null
                 ? this.OrderHistory
-                : new(orders.ToDictionary(kvp => kvp.Key, kvp => kvp.Value)));
+                : new(orders.ToDictionary(kvp => kvp.Key, kvp => kvp.Value)),
+            orderSets: orderSets == null
+                ? this.OrderSets
+                : new(orderSets.ToList()));
 
     /// <summary>
     /// Create a new world with new units created from unit specs. Units specs are in the format
@@ -174,7 +188,7 @@ public class World
     {
         return this.AddUnits(
             "Austria A Bud",
-            "Austria A Vir",
+            "Austria A Vie",
             "Austria F Tri",
             "England A Lvp",
             "England F Edi",
@@ -295,6 +309,17 @@ public class World
         return foundUnit;
     }
 
+    public PhaseType GetNextPhaseType()
+    {
+        // TODO: Figure how to order build and sustain phases in a staggered multiverse
+        if (RetreatingUnits.Any())
+        {
+            return PhaseType.Retreat;
+        }
+
+        return PhaseType.Movement;
+    }
+
     /// <summary>
     /// The standard Diplomacy provinces.
     /// </summary>

MultiversalDiplomacy/MultiversalDiplomacy.csproj

@@ -7,4 +7,8 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="CommandLineParser" Version="2.9.1" />
+  </ItemGroup>
+
 </Project>

MultiversalDiplomacy/Program.cs

@@ -1,12 +1,99 @@
-using System;
+using CommandLine;
 
-namespace MultiversalDiplomacy
+using MultiversalDiplomacy.Script;
+
+namespace MultiversalDiplomacy;
+
+internal class Program
 {
-    internal class Program
-    {
     static void Main(string[] args)
     {
-            Console.WriteLine("stab");
+        var parser = Parser.Default;
+        var parseResult = parser.ParseArguments(args, typeof(ReplOptions));
+
+        parseResult
+            .WithParsed<ReplOptions>(ExecuteRepl);
     }
+
+    static void ExecuteRepl(ReplOptions args)
+    {
+        // Create a writer to the output file, if specified.
+        StreamWriter? outputWriter = null;
+        if (args.OutputFile is not null)
+        {
+            string fullPath = Path.GetFullPath(args.OutputFile);
+            string outputPath = Directory.Exists(fullPath)
+                ? Path.Combine(fullPath, $"{DateTime.UtcNow.ToString("yyyyMMddHHmmss")}.log")
+                : fullPath;
+            Console.WriteLine($"Echoing to {outputPath}");
+            outputWriter = File.AppendText(outputPath);
+        }
+
+        // Define an enumerator for live repl commands.
+        static IEnumerable<string?> GetReplInputs()
+        {
+            // Read user input until it stops (i.e. is null).
+            string? input = null;
+            do
+            {
+                input = Console.ReadLine();
+                yield return input;
+            }
+            while (input is not null);
+            // The last null is returned because an EOF means we should quit the repl.
+        }
+
+        // Define an enumerator for input file commands, if specified.
+        static IEnumerable<string?> GetFileInputs(string inputFile)
+        {
+            // Read all lines from the input file.
+            var fullPath = Path.GetFullPath(inputFile);
+            foreach (string line in File.ReadLines(fullPath))
+            {
+                var trimmed = line.Trim();
+                Console.WriteLine($"{trimmed}");
+                yield return trimmed;
+            }
+            // Don't return a null, since this will be followed by GetReplInputs.
+        }
+
+        // Set up the input enumerator.
+        IEnumerable<string?> inputs;
+        if (args.InputFile is not null)
+        {
+            Console.WriteLine($"Reading from {args.InputFile}");
+            inputs = GetFileInputs(args.InputFile).Concat(GetReplInputs());
+        }
+        else
+        {
+            inputs = GetReplInputs();
+        }
+
+        IScriptHandler? handler = new ReplScriptHandler();
+
+        Console.Write(handler.Prompt);
+        foreach (string? nextInput in inputs)
+        {
+            // Handle quitting directly.
+            if (nextInput is null || nextInput == "quit" || nextInput == "exit")
+            {
+                break;
+            }
+            string input = nextInput.Trim();
+            outputWriter?.WriteLine(input);
+            outputWriter?.Flush();
+
+            // Delegate all other command parsing to the handler.
+            handler = handler.HandleInput(input);
+
+            // Quit if the handler ends processing, otherwise prompt for the next command.
+            if (handler is null)
+            {
+                break;
+            }
+            Console.Write(handler.Prompt);
+        }
+
+        Console.WriteLine("exiting");
     }
 }

MultiversalDiplomacy/ReplOptions.cs

@@ -0,0 +1,13 @@
+using CommandLine;
+
+namespace MultiversalDiplomacy;
+
+[Verb("repl", HelpText = "Begin an interactive 5dplomacy session.")]
+public class ReplOptions
+{
+    [Option('i', "input", HelpText = "Begin the repl session by executing the commands in this file")]
+    public string? InputFile { get; set; }
+
+    [Option('o', "output", HelpText = "Echo the repl session to this file. Specify a directory to autogenerate a filename")]
+    public string? OutputFile { get; set; }
+}

MultiversalDiplomacy/Script/GameScriptHandler.cs

@@ -0,0 +1,114 @@
+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A script handler for interacting with a loaded game.
+/// </summary>
+public class GameScriptHandler : IScriptHandler
+{
+    public GameScriptHandler(World world)
+    {
+        World = world;
+    }
+
+    public string Prompt => "5dp> ";
+
+    public World World { get; set; }
+
+    public IScriptHandler? HandleInput(string input)
+    {
+        var args = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        if (args.Length == 0)
+        {
+            return this;
+        }
+
+        var command = args[0];
+        switch (command)
+        {
+            case "help":
+            case "?":
+                Console.WriteLine("commands:");
+                Console.WriteLine("  adjudicate: adjudicate the current orders");
+                Console.WriteLine("  assert: assert about the state of the game");
+                Console.WriteLine("  list: list things in a game category");
+                Console.WriteLine("  orders: submit order sets");
+                Console.WriteLine("  status: overview of the state of the game");
+                break;
+
+            case "adjudicate":
+                World = GameController.AdjudicateOrders(World);
+                break;
+
+            case "assert" when args.Length == 1:
+                Console.WriteLine("usage:");
+                Console.WriteLine("  assert timeline [timeline]@[turn]: timeline exists");
+                Console.WriteLine("  assert unit [unit spec]: unit exists");
+                break;
+
+            case "assert" when args[1] == "timeline":
+                // TODO: raise an error if the timeline doesn't exist
+                Console.WriteLine("WIP");
+                break;
+
+            case "assert" when args[1] == "unit":
+                // TODO: raise an error if the unit doesn't exist
+                Console.WriteLine("WIP");
+                break;
+
+            case "list" when args.Length == 1:
+                Console.WriteLine("usage:");
+                Console.WriteLine("  list ordersets: unadjudicated order sets");
+                Console.WriteLine("  list powers: the powers in the game");
+                break;
+
+            case "list" when args[1] == "ordersets":
+                foreach (OrderSet orderSet in World.OrderSets.Where(os => !os.Adjudicated))
+                {
+                    var lines = orderSet.Text.Split('\n');
+                    var firstLine = lines[0].Trim();
+                    Console.WriteLine($"  {firstLine} ({lines.Length - 1} orders)");
+                }
+                break;
+
+            case "list" when args[1] == "powers":
+                Console.WriteLine("Powers:");
+                foreach (Power power in World.Powers)
+                {
+                    Console.WriteLine($"  {power.Name}");
+                }
+                break;
+
+            case "orders" when args.Length == 1:
+                Console.WriteLine("usage: orders [power]");
+                break;
+
+            case "orders":
+                if (World.Powers.Any(p => p.Name == args[1]))
+                {
+                    var handler = new OrderSetScriptHandler(this, World, input);
+                    return handler;
+                }
+                Console.WriteLine("Unrecognized power");
+                break;
+
+            case "status":
+                foreach (Season season in World.Seasons)
+                {
+                    Console.WriteLine($"{season}");
+                    foreach (Unit unit in World.Units.Where(u => u.Season == season))
+                    {
+                        Console.WriteLine($"  {unit}");
+                    }
+                }
+                break;
+
+            default:
+                Console.WriteLine("Unrecognized command");
+                break;
+        }
+
+        return this;
+    }
+}

MultiversalDiplomacy/Script/IScriptHandler.cs

@@ -0,0 +1,21 @@
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A handler that interprets and executes 5dp script commands. Script handlers may create additional script handlers
+/// and delegate handling to them, allowing a sort of recursive parsing of script commands.
+/// </summary>
+public interface IScriptHandler
+{
+    /// <summary>
+    /// When used interactively, the prompt that should be displayed.
+    /// </summary>
+    public string Prompt { get; }
+
+    /// <summary>
+    /// Process a line of input.
+    /// </summary>
+    /// <returns>
+    /// The handler that should handle the next line of input, or null if script handling should end.
+    /// </returns>
+    public IScriptHandler? HandleInput(string input);
+}

MultiversalDiplomacy/Script/OrderSetScriptHandler.cs

@@ -0,0 +1,39 @@
+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A script handler for defining order sets.
+/// </summary>
+public class OrderSetScriptHandler : IScriptHandler
+{
+    public OrderSetScriptHandler(GameScriptHandler parent, World world, string orderCommand)
+    {
+        this.parent = parent;
+        this.world = world;
+        this.orderSet = new() { orderCommand };
+    }
+
+    public string Prompt => "...> ";
+
+    private GameScriptHandler parent { get; }
+
+    private World world { get; }
+
+    private List<string> orderSet { get; }
+
+    public IScriptHandler? HandleInput(string input)
+    {
+        if (string.IsNullOrEmpty(input))
+        {
+            parent.World = GameController.SubmitOrderSet(world, string.Join('\n', orderSet));
+            Console.WriteLine("Submitted order set");
+            return parent;
+        }
+        else
+        {
+            orderSet.Add(input);
+            return this;
+        }
+    }
+}

MultiversalDiplomacy/Script/ReplScriptHandler.cs

@@ -0,0 +1,58 @@
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A script handler for the interactive repl.
+/// </summary>
+public class ReplScriptHandler : IScriptHandler
+{
+    public string Prompt => "5dp> ";
+
+    public IScriptHandler? HandleInput(string input)
+    {
+        var args = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        if (args.Length == 0)
+        {
+            return this;
+        }
+
+        var command = args[0];
+        switch (command)
+        {
+            case "help":
+            case "?":
+                Console.WriteLine("commands:");
+                Console.WriteLine("  help, ?: print this message");
+                Console.WriteLine("  stab: stab");
+                Console.WriteLine("  new: start a new game");
+                break;
+
+            case "stab":
+                Console.WriteLine("stab");
+                break;
+
+            case "new" when args.Length == 1:
+                Console.WriteLine("usage:");
+                Console.WriteLine("  new custom: standard map, declare units");
+                Console.WriteLine("  new standard: standard map, standard units");
+                break;
+
+            case "new" when args[1] == "custom":
+                var world = MultiversalDiplomacy.Model.World.WithStandardMap();
+                var setupHandler = new SetupScriptHandler(world);
+                Console.WriteLine("Created an empty game");
+                return setupHandler;
+
+            case "new" when args[1] == "standard":
+                world = GameController.InitializeWorld();
+                var gameHandler = new GameScriptHandler(world);
+                Console.WriteLine("Created a standard game");
+                return gameHandler;
+
+            default:
+                Console.WriteLine("Unrecognized command");
+                break;
+        }
+
+        return this;
+    }
+}

MultiversalDiplomacy/Script/SetupScriptHandler.cs

@@ -0,0 +1,135 @@
+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Script;
+
+/// <summary>
+/// A script handler for interacting with a loaded game.
+/// </summary>
+public class SetupScriptHandler : IScriptHandler
+{
+    public SetupScriptHandler(World world)
+    {
+        World = world;
+    }
+
+    public string Prompt => "5dp> ";
+
+    public World World { get; set; }
+
+    public IScriptHandler? HandleInput(string input)
+    {
+        var args = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        if (args.Length == 0)
+        {
+            return new GameScriptHandler(World);
+        }
+
+        var command = args[0];
+        switch (command)
+        {
+            case "help":
+            case "?":
+                Console.WriteLine("commands:");
+                Console.WriteLine("  unit: add a unit to the map");
+                Console.WriteLine("  list: list things in a game category");
+                Console.WriteLine("  enter a blank line to complete setup");
+                break;
+
+            case "list" when args.Length == 1:
+                Console.WriteLine("usage:");
+                Console.WriteLine("  list powers: the powers in the game");
+                Console.WriteLine("  list units: units created so far");
+                break;
+
+            case "list" when args[1] == "powers":
+                Console.WriteLine("Powers:");
+                foreach (Power power in World.Powers)
+                {
+                    Console.WriteLine($"  {power.Name}");
+                }
+                break;
+
+            case "list" when args[1] == "units":
+                Console.WriteLine("Units:");
+                foreach (Unit unit in World.Units)
+                {
+                    Console.WriteLine($"  {unit}");
+                }
+                break;
+
+            case "unit" when args.Length < 4:
+                Console.WriteLine("usage: unit [power] [type] [province]");
+                break;
+
+            case "unit":
+                ParseUnit(args);
+                break;
+
+            default:
+                Console.WriteLine("Unrecognized command");
+                break;
+        }
+
+        return this;
+    }
+
+    private void ParseUnit(string[] args)
+    {
+        // Parse the power name by substring matching.
+        string powerArg = args[1].ToLower();
+        var matchingPowers = World.Powers.Where(p => p.Name.ToLower().StartsWith(powerArg));
+        if (matchingPowers.Count() < 1)
+        {
+            Console.WriteLine($"No power named \"{args[1]}\"");
+            return;
+        }
+        if (matchingPowers.Count() > 1)
+        {
+            Console.WriteLine($"Ambiguous power \"{args[1]}\"");
+            return;
+        }
+        Power power = matchingPowers.First();
+
+        // Parse the unit type by substring matching.
+        string typeArg = args[2].ToLower();
+        var matchingTypes = Enum.GetNames<UnitType>().Where(t => t.ToLower().StartsWith(typeArg));
+        if (matchingTypes.Count() < 1)
+        {
+            Console.WriteLine($"No unit type \"{args[2]}\"");
+            return;
+        }
+        if (matchingTypes.Count() > 1)
+        {
+            Console.WriteLine($"Ambiguous unit type \"{args[2]}\"");
+            return;
+        }
+        UnitType type = (UnitType)Enum.Parse(typeof(UnitType), matchingTypes.First());
+
+        // Parse the province by matching the province name or one of its abbreviations,
+        // allowing location specifications separated by a forward slash, e.g. spa/nc.
+        string provinceArg = args[3].ToLower();
+        var matchingProvs = World.Provinces.Where(pr
+            => pr.Abbreviations.Any(abv => abv.ToLower() == provinceArg)
+            || pr.Name.ToLower() == provinceArg);
+        if (matchingProvs.Count() < 1)
+        {
+            Console.WriteLine($"No province matches \"{args[3]}\"");
+            return;
+        }
+        if (matchingTypes.Count() > 1)
+        {
+            Console.WriteLine($"Ambiguous province \"{args[3]}\"");
+            return;
+        }
+        // TODO: this does not support multi-location provinces correctly
+        Province province = matchingProvs.First();
+        Location location = province.Locations.First(loc
+            => type == UnitType.Army && loc.Type == LocationType.Land
+            || type == UnitType.Fleet && loc.Type == LocationType.Water);
+
+        Unit unit = Unit.Build(location, World.RootSeason, power, type);
+        World = World.Update(units: World.Units.Append(unit));
+
+        Console.WriteLine($"Created unit {unit}");
+    }
+}

README.md

@@ -22,8 +22,102 @@ When a unit changes the outcome of a battle in the past, only the timeline of th
 
 Since there are many ways to create new timelines, the game would rapidly expand beyond all comprehension if this were not counterbalanced in some way. This happens during the _sustain phase_, which occurs after the fall movement and retreat phases and before the winter buid/disband phase.
 
-(TODO)
+WIP: the sustain phase has not been implemented yet
 
 ### Victory conditions
 
 The Great Powers of Europe can only wage multiversal wars because they are lead by extradimensional beings masquerading as human politicians. When a country is eliminated in one timeline, its extradimensional leader is executed, killing them in all timelines.
+
+### Unit designations
+
+In _Diplomacy_, orders refer to provinces, such as "A Mun-Tyr". In _5D Diplomacy with Multiversal Time Travel_, this is insufficient to unambiguously identify a province, since the province exists in multiple timelines across multiple turns. The convention for identifying a multiversal location is `timeline:province:turn`, where `timeline` is the timeline's identifier and `turn` is the turn's identifier. Thus, an army in Munich in timeline "bravo" in Spring 1902 is referenced as "A b:Mun:S02".
+
+(Why this order? Short representations for timelines and turns can be confused for each other, especially for timelines designated with `foxtrot` or `sierra` and turns in Fall or Spring. _5D Diplomacy with Multiversal Time Travel_ is already complicated enough, so the timeline and turn are put on either side of the province.)
+
+WIP: parsing of turn designations has not been implemented yet
+
+### Open convoys
+
+The standard _Diplomacy_ rules require that a convoy order include the convoyed unit's origin and destination. This is hard to coordinate once there are multiple turns and timelines involved. _5D Diplomacy with Multiversal Time Travel_ thus introduces the concept of an _open convoy_, a nonspecific convoy order that can become part of a convoy later.
+
+WIP: open convoys have not been implemented yet
+
+## DATC compliance
+
+WIP
+
+## 5dp script
+
+Order notation is case-insensitive.
+
+### Order element grammar
+
+A unit type is specified with a single letter.
+```
+ <unit-spec> = "A" / "F"
+```
+
+A timeline is specified with a primary designation initial, plus a secondary designation if there are enough timelines.
+```
+<timeline-spec> = <tl-primary> <tl-secondary>
+   <tl-primary> = "a" / "b" / ...
+ <tl-secondary> = "" / "1" / "2" / ...
+```
+
+A province is specified with a known three-letter abbreviation. A named location in a province may optionally be specfied with its abbreviation. A named location is not necessary for the _form_ of a province to be valid, though an order may be invalid if the omission creates an ambiguity.
+```
+<province-spec> = <province> ["/" <location>]
+     <province> = "MUN" / "TYR" / ...
+     <location> = "nc" / "sc" / ...
+```
+
+A turn is specified with the season's initial and the short form of the year. Winter is numbered in the year of the previous Fall.
+```
+<turn-spec> = <season> <year>
+   <season> = "S" / "F" / "W"
+     <year> = "01" / "02" / ...
+```
+
+A multiversal location is a timeline, a province, and a turn separated by a colon.
+```
+<multiverse-spec> = <timeline-spec> ":" <province-spec> ":" <turn-spec>
+```
+
+Thus, `b1:IRI:F02` represents the Irish Sea, in Fall 1902, in timeline bravo-prime.
+
+### Order formats
+
+Note that DATC 4.C makes unit designations superfluous outside some build order cases. Thus, the `<unit-spec>` is considered optional in the orders below.
+
+Hold orders require the unit and an indication of a hold order.
+```
+<hold-order> = [<unit-spec> " "] <multiverse-spec> " " <hold-token>
+<hold-token> = "hold" / "holds"
+```
+
+Move orders require the unit, target, and an indication of movement instead of support.
+```
+<move-order> = [<unit-spec> " "] <multiverse-spec> <move-token> <multiverse-spec>
+<move-token> = "-" / " to "
+```
+
+Support-hold orders require the unit, target, and an indication of support instead of movement.
+```
+<support-hold-order> = [<unit-spec> " "] <multiverse-spec> <support-token> <multiverse-spec>
+     <support-token> = " S " / " support " / " supports "
+```
+
+Support-move orders require the unit, target, and the support and move indicators.
+```
+<support-move-order> = [<unit-spec> " "] <multiverse-spec> <support-token> <move-order>
+```
+
+Convoy orders WIP.
+
+Retreat orders WIP.
+
+Build orders WIP.
+
+Disband orders WIP.
+
+Sustain orders WIP.

flake.nix

@@ -9,6 +9,9 @@
       let pkgs = nixpkgs.legacyPackages.${system};
       in rec {
         devShell = pkgs.mkShell {
+          shellHook = ''
+            alias repl="dotnet run --project MultiversalDiplomacy repl"
+          '';
           DOTNET_CLI_TELEMETRY_OPTOUT = 1;
           NIX_LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [ pkgs.stdenv.cc.cc ];
           NIX_LD = builtins.readFile "${pkgs.stdenv.cc}/nix-support/dynamic-linker";

script.txt

@@ -0,0 +1,12 @@
+new custom
+unit Germany Army Berlin
+unit Austria Army Tyrolia
+
+orders Germany
+BER - TYR
+
+orders Austria
+TYR hold
+
+list ordersets
+adjudicate

test.sh

@@ -0,0 +1 @@
+dotnet test -l "console;verbosity=normal" MultiversalDiplomacyTests/ $@