/blueprint, root command executor

src/main/kotlin/net/mcbrawls/blueprint/command/BlueprintCommand.kt

@@ -1,16 +1,40 @@
 package net.mcbrawls.blueprint.command
 
 import com.mojang.brigadier.CommandDispatcher
+import com.mojang.brigadier.context.CommandContext
+import net.fabricmc.loader.api.FabricLoader
+import net.fabricmc.loader.api.ModContainer
+import net.fabricmc.loader.api.Version
+import net.fabricmc.loader.api.metadata.ModMetadata
+import net.mcbrawls.blueprint.BlueprintMod
+import net.mcbrawls.blueprint.BlueprintMod.MOD_NAME
 import net.minecraft.server.command.CommandManager.RegistrationEnvironment
 import net.minecraft.server.command.CommandManager.literal
 import net.minecraft.server.command.ServerCommandSource
+import net.minecraft.text.Text
+import net.minecraft.util.Formatting
 
 object BlueprintCommand {
     fun register(dispatcher: CommandDispatcher<ServerCommandSource>, environment: RegistrationEnvironment) {
-        val builder = literal("blueprint")
+        val builder = literal("blueprint").executes(::execute)
 
         //
 
         dispatcher.register(builder)
     }
+
+    private fun execute(context: CommandContext<ServerCommandSource>): Int {
+        // retrieve version
+        val loader = FabricLoader.getInstance()
+        val container = loader.getModContainer(BlueprintMod.MOD_ID)
+        val optionalVersion = container
+            .map(ModContainer::getMetadata)
+            .map(ModMetadata::getVersion)
+            .map(Version::getFriendlyString)
+        val version = optionalVersion.orElseGet { "Unknown" }
+
+        // feedback version
+        context.source.sendFeedback({ Text.literal("[$MOD_NAME] Version $version").formatted(Formatting.AQUA) }, false)
+        return 1
+    }
 }