two last commands from 1.13.2

src/main/java/carpet/commands/DistanceCommand.java

@@ -0,0 +1,42 @@
+package carpet.commands;
+
+import carpet.CarpetSettings;
+import carpet.utils.DistanceCalculator;
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.command.arguments.Vec3ArgumentType;
+
+import static net.minecraft.server.command.CommandManager.argument;
+import static net.minecraft.server.command.CommandManager.literal;
+
+public class DistanceCommand
+{
+    public static void register(CommandDispatcher<ServerCommandSource> dispatcher)
+    {
+        LiteralArgumentBuilder<ServerCommandSource> command = literal("distance").
+                requires((player) -> CarpetSettings.getBool("commandDistance")).
+                then(literal("from").
+                        executes( (c) -> DistanceCalculator.setStart(c.getSource(), c.getSource().getPosition())).
+                        then(argument("from", Vec3ArgumentType.create()).
+                                executes( (c) -> DistanceCalculator.setStart(
+                                        c.getSource(),
+                                        Vec3ArgumentType.getVec3(c, "from"))).
+                                then(literal("to").
+                                        executes((c) -> DistanceCalculator.distance(
+                                                c.getSource(),
+                                                Vec3ArgumentType.getVec3(c, "from"),
+                                                c.getSource().getPosition())).
+                                        then(argument("to", Vec3ArgumentType.create()).
+                                                executes( (c) -> DistanceCalculator.distance(
+                                                        c.getSource(),
+                                                        Vec3ArgumentType.getVec3(c, "from"),
+                                                        Vec3ArgumentType.getVec3(c, "to")
+                                                )))))).
+                then(literal("to").
+                        executes( (c) -> DistanceCalculator.setEnd(c.getSource(), c.getSource().getPosition()) ).
+                        then(argument("to", Vec3ArgumentType.create()).
+                                executes( (c) -> DistanceCalculator.setEnd(c.getSource(), Vec3ArgumentType.getVec3(c, "to")))));
+        dispatcher.register(command);
+    }
+}