Fixed for AOT publishing on linux.

src/cs-mic-cli/Options.cs

@@ -1,21 +1,11 @@
-using CommandLine;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace cs_mic_cli
+namespace cs_mic_cli
 {
     internal class Options
     {
-        [Option('v', "verbose", HelpText = "Displays error messages from the parser if a soft error occurs.")]
         public bool Verbose { get; set; }
 
-        [Option('i', "interactive", HelpText = "Starts an interactive session.")]
         public bool Interactive { get; set; }
 
-        [Value(0)]
-        public required IEnumerable<string> Expression { get; set; }
+        public IEnumerable<string> Expression { get; set; } = Array.Empty<string>();
     }
 }

src/cs-mic-cli/Program.cs

@@ -1,17 +1,61 @@
-using CommandLine;
-using cs_mic_cli.Functions;
+using cs_mic_cli.Functions;
 using CSMic;
 using CSMic.StandardLibrary;
+using System.CommandLine;
 
 namespace cs_mic_cli
 {
     internal class Program
     {
 
-        static void Main(string[] args)
+        static int Main(string[] args)
         {
-            CommandLine.Parser.Default.ParseArguments<Options>(args)
-                .WithParsed(options =>
+            var verboseOption = new Option<bool>("--verbose", "-v")
+            {
+                Description = "Displays error messages from the parser if a soft error occurs."
+            };
+            var interactiveOption = new Option<bool>("--interactive", "-i")
+            {
+                Description = "Starts an interactive session."
+            };
+            var expressionArgument = new Argument<string[]>("expression")
+            {
+                Arity = ArgumentArity.ZeroOrMore,
+                Description = "Expression to evaluate."
+            };
+            expressionArgument.Validators.Add(result =>
+            {
+                foreach (var token in result.Tokens)
+                {
+                    if (token.Value.StartsWith("--", StringComparison.Ordinal))
+                    {
+                        result.AddError($"Unrecognized command or argument '{token.Value}'.");
+                    }
+                }
+            });
+            var rootCommand = new RootCommand("CSMic command line client")
+            {
+                verboseOption,
+                interactiveOption,
+                expressionArgument
+            };
+
+            rootCommand.SetAction(parseResult =>
+            {
+                var options = new Options
+                {
+                    Verbose = parseResult.GetValue(verboseOption),
+                    Interactive = parseResult.GetValue(interactiveOption),
+                    Expression = parseResult.GetValue(expressionArgument) ?? Array.Empty<string>()
+                };
+
+                return Run(options);
+            });
+
+            return rootCommand.Parse(args).Invoke();
+        }
+
+        private static int Run(Options options)
         {
             var fullExpression = string.Join(' ', options.Expression);
             var inputInterpreter = new InputInterpreter();
@@ -56,11 +100,8 @@ namespace cs_mic_cli
                 // one-shot mode
                 Calculate(inputInterpreter, options, fullExpression);
             }
-                })
-                .WithNotParsed<Options>(options =>
-                {
 
-                });
+            return 0;
         }
 
         private static void Calculate(InputInterpreter inputInterpreter, Options options, string expression)

src/cs-mic-cli/cs-mic-cli.csproj

@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CommandLineParser" Version="2.9.1" />
+    <PackageReference Include="System.CommandLine" Version="2.0.9" />
     <PackageReference Include="CSMic" Version="2.1.0" />
     <PackageReference Include="CSMic.StandardLibrary" Version="2.1.1" />
   </ItemGroup>