moved custom arguments to before the commands and handled missing functions nicely.

src/main/java/carpet/script/CarpetScriptHost.java

@@ -283,21 +283,7 @@ public class CarpetScriptHost extends ScriptHost
             Map<Value, Value> config = ((MapValue) ret).getMap();
             setPerPlayer(config.getOrDefault(new StringValue("scope"), new StringValue("player")).getString().equalsIgnoreCase("player"));
             persistenceRequired = config.getOrDefault(new StringValue("stay_loaded"), Value.TRUE).getBoolean();
-            // read custom arguments
-            Value arguments = config.get(StringValue.of("arguments"));
-            if (arguments != null)
-            {
-                if (!(arguments instanceof MapValue))
-                    throw new InternalExpressionException("'arguments' element in config should be a map");
-                for (Map.Entry<Value, Value> typeData : ((MapValue)arguments).getMap().entrySet())
-                {
-                    String argument = typeData.getKey().getString();
-                    Value spec = typeData.getValue();
-                    if (!(spec instanceof MapValue)) throw new InternalExpressionException("Spec for '"+argument+"' should be a map");
-                    Map<String, Value> specData = ((MapValue) spec).getMap().entrySet().stream().collect(Collectors.toMap(e -> e.getKey().getString(), Map.Entry::getValue));
-                    appArgTypes.put(argument, CommandArgument.buildFromConfig(argument, specData, this));
-                }
-            }
+
             appConfig = config;
         }
         catch (NullPointerException ignored)
@@ -323,8 +309,37 @@ public class CarpetScriptHost extends ScriptHost
         }
     }
 
+    public void readCustomArgumentTypes() throws CommandSyntaxException
+    {
+        // read custom arguments
+        Value arguments = appConfig.get(StringValue.of("arguments"));
+        if (arguments != null)
+        {
+            if (!(arguments instanceof MapValue))
+                throw CommandArgument.error("'arguments' element in config should be a map");
+            appArgTypes.clear();
+            for (Map.Entry<Value, Value> typeData : ((MapValue)arguments).getMap().entrySet())
+            {
+                String argument = typeData.getKey().getString();
+                Value spec = typeData.getValue();
+                if (!(spec instanceof MapValue)) throw CommandArgument.error("Spec for '"+argument+"' should be a map");
+                Map<String, Value> specData = ((MapValue) spec).getMap().entrySet().stream().collect(Collectors.toMap(e -> e.getKey().getString(), Map.Entry::getValue));
+                appArgTypes.put(argument, CommandArgument.buildFromConfig(argument, specData, this));
+            }
+        }
+    }
+
     public Boolean addAppCommands(Consumer<Text> notifier)
     {
+        try
+        {
+            readCustomArgumentTypes();
+        }
+        catch (CommandSyntaxException e)
+        {
+            notifier.accept(Messenger.c("Error when handling of setting up custom argument types: "+e.getMessage()));
+            return false;
+        }
         if (appConfig.get(StringValue.of("commands")) != null)
         {
             try
@@ -342,7 +357,7 @@ public class CarpetScriptHost extends ScriptHost
             catch (CommandSyntaxException cse)
             {
                 // failed
-                notifier.accept(Messenger.c("r Failed to build command system for "+getName()+" thus failed to load the app ", cse.getRawMessage()));
+                notifier.accept(Messenger.c("r Failed to build command system for "+getName()+" thus failed to load the app: ", cse.getRawMessage()));
                 return null;
             }
 
@@ -382,9 +397,11 @@ public class CarpetScriptHost extends ScriptHost
                     return (int)response.readInteger();
                 });
 
+        boolean hasTypeSupport = appConfig.getOrDefault(StringValue.of("legacy_command_type_support"), Value.FALSE).getBoolean();
+
         for (String function : globaFunctionNames(main, s ->  !s.startsWith("_")).sorted().collect(Collectors.toList()))
         {
-            if (appConfig.getOrDefault(StringValue.of("legacy_command_type_support"), Value.FALSE).getBoolean())
+            if (hasTypeSupport)
             {
                 try
                 {

src/main/java/carpet/script/argument/FunctionArgument.java

@@ -4,10 +4,12 @@ import carpet.script.Context;
 import carpet.script.LazyValue;
 import carpet.script.ScriptHost;
 import carpet.script.bundled.Module;
+import carpet.script.command.CommandArgument;
 import carpet.script.exception.InternalExpressionException;
 import carpet.script.value.FunctionValue;
 import carpet.script.value.ListValue;
 import carpet.script.value.Value;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -70,14 +72,13 @@ public class FunctionArgument<T> extends Argument
         return new FunctionArgument<>(fun, offset + 1 + argsize, lvargs);
     }
 
-    public static FunctionArgument<Value> fromCommandSpec(ScriptHost host, Value funSpec)
-    {
+    public static FunctionArgument<Value> fromCommandSpec(ScriptHost host, Value funSpec) throws CommandSyntaxException {
         FunctionValue function;
         List<Value> args = Collections.emptyList();
         if (!(funSpec instanceof ListValue))
             funSpec = ListValue.of(funSpec);
         List<Value> params = ((ListValue) funSpec).getItems();
-        if (params.isEmpty()) throw new InternalExpressionException("Function has empty spec");
+        if (params.isEmpty()) throw CommandArgument.error("Function has empty spec");
         Value first = params.get(0);
         if (first instanceof FunctionValue)
         {
@@ -86,7 +87,8 @@ public class FunctionArgument<T> extends Argument
         else
         {
             String name = first.getString();
-            function = host.getAssertFunction(host.main, name);
+            function = host.getFunction(name);
+            if (function == null) throw CommandArgument.error("Function "+name+" is not defined yet");
         }
         if (params.size() > 1) args = params.subList(1,params.size());
 

src/main/java/carpet/script/command/CommandArgument.java

@@ -319,20 +319,20 @@ public abstract class CommandArgument
         return suffix;
     }
 
-    public static CommandArgument buildFromConfig(String suffix, Map<String, Value> config, CarpetScriptHost host)
+    public static CommandArgument buildFromConfig(String suffix, Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
     {
         if (!config.containsKey("type"))
-            throw new InternalExpressionException("Custom type "+suffix+" should at least specify the type");
+            throw CommandArgument.error("Custom type "+suffix+" should at least specify the type");
         String baseType = config.get("type").getString();
         if (!builtIns.containsKey(baseType))
-            throw new InternalExpressionException("Unknown base type "+baseType+" for custom type "+suffix);
+            throw CommandArgument.error("Unknown base type "+baseType+" for custom type "+suffix);
         CommandArgument variant = builtIns.get(baseType).factory().get();
         variant.suffix = suffix;
         variant.configure(config, host);
         return variant;
     }
 
-    protected void configure(Map<String, Value> config, CarpetScriptHost host)
+    protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
     {
         caseSensitive = config.getOrDefault("case_sensitive", Value.TRUE).getBoolean();
         if (config.containsKey("suggester"))
@@ -341,9 +341,9 @@ public abstract class CommandArgument
         }
         if (config.containsKey("suggest"))
         {
-            if (config.containsKey("suggester")) throw new InternalExpressionException("Attempted to provide 'suggest' list while 'suggester' is present"+" for custom type "+suffix);
+            if (config.containsKey("suggester")) throw error("Attempted to provide 'suggest' list while 'suggester' is present"+" for custom type "+suffix);
             Value suggestionValue = config.get("suggest");
-            if (!(suggestionValue instanceof ListValue)) throw new InternalExpressionException("Argument suggestions needs to be a list"+" for custom type "+suffix);
+            if (!(suggestionValue instanceof ListValue)) throw error("Argument suggestions needs to be a list"+" for custom type "+suffix);
             examples = ((ListValue) suggestionValue).getItems().stream()
                     .map(Value::getString)
                     .collect(Collectors.toSet());
@@ -442,13 +442,13 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             if (config.containsKey("options"))
             {
                 Value optionsValue = config.get("options");
-                if (!(optionsValue instanceof ListValue)) throw new InternalExpressionException("Custom string type requires options passed as a list"+" for custom type "+suffix);
+                if (!(optionsValue instanceof ListValue)) throw error("Custom string type requires options passed as a list"+" for custom type "+suffix);
                 validOptions = ((ListValue) optionsValue).getItems().stream()
                         .map(v -> caseSensitive?v.getString():(v.getString().toLowerCase(Locale.ROOT)))
                         .collect(Collectors.toSet());
@@ -508,7 +508,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             mustBeLoaded = config.getOrDefault("loaded", Value.FALSE).getBoolean();
@@ -543,7 +543,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             blockCentered = config.getOrDefault("block_centered", Value.TRUE).getBoolean();
@@ -591,7 +591,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             onlyFans = config.getOrDefault("players", Value.FALSE).getBoolean();
@@ -632,7 +632,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             single = config.getOrDefault("single", Value.FALSE).getBoolean();
@@ -673,7 +673,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             single = config.getOrDefault("single", Value.FALSE).getBoolean();
@@ -710,7 +710,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             mapRequired = !config.getOrDefault("allow_element", Value.FALSE).getBoolean();
@@ -756,13 +756,13 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             if (config.containsKey("options"))
             {
                 Value optionsValue = config.get("options");
-                if (!(optionsValue instanceof ListValue)) throw new InternalExpressionException("Custom sting type requires options passed as a list"+" for custom type "+suffix);
+                if (!(optionsValue instanceof ListValue)) throw error("Custom sting type requires options passed as a list"+" for custom type "+suffix);
                 validOptions = ((ListValue) optionsValue).getItems().stream().map(v -> new Identifier(v.getString())).collect(Collectors.toSet());
             }
         }
@@ -798,7 +798,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             if (config.containsKey("min"))
@@ -809,7 +809,7 @@ public abstract class CommandArgument
             {
                 max = NumericValue.asNumber(config.get("max"), "max").getDouble();
             }
-            if (max != null && min == null) throw new InternalExpressionException("Double types cannot be only upper-bounded"+" for custom type "+suffix);
+            if (max != null && min == null) throw error("Double types cannot be only upper-bounded"+" for custom type "+suffix);
         }
 
         @Override
@@ -849,7 +849,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             if (config.containsKey("min"))
@@ -860,7 +860,7 @@ public abstract class CommandArgument
             {
                 max = NumericValue.asNumber(config.get("max"), "max").getLong();
             }
-            if (max != null && min == null) throw new InternalExpressionException("Double types cannot be only upper-bounded"+" for custom type "+suffix);
+            if (max != null && min == null) throw error("Double types cannot be only upper-bounded"+" for custom type "+suffix);
         }
 
         @Override
@@ -939,7 +939,7 @@ public abstract class CommandArgument
         }
 
         @Override
-        protected void configure(Map<String, Value> config, CarpetScriptHost host)
+        protected void configure(Map<String, Value> config, CarpetScriptHost host) throws CommandSyntaxException
         {
             super.configure(config, host);
             if (config.containsKey("restrict"))
@@ -947,7 +947,7 @@ public abstract class CommandArgument
                 restrict = config.get("restrict").getString().toLowerCase(Locale.ROOT);
                 needsMatching = true;
                 if (!RESTRICTED_CONTAINERS.containsKey(restrict))
-                    throw new InternalExpressionException("Incorrect slot restriction "+restrict+" for custom type "+suffix);
+                    throw error("Incorrect slot restriction "+restrict+" for custom type "+suffix);
             }
         }