Port seed selector to fabric

gradle.properties

@@ -9,5 +9,5 @@ org.gradle.jvmargs=-Xmx1G
 # Mod Properties
 	mod_version = 1.0.0
 	maven_group = net.earthcomputer
-	archives_base_name = world-gen-tests
+	archives_base_name = seed-selector
 

src/main/java/net/earthcomputer/seedselector/mixin/MixinMinecraft.java

@@ -0,0 +1,57 @@
+package net.earthcomputer.seedselector.mixin;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.src.World;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import javax.swing.*;
+import java.io.File;
+
+@Mixin(Minecraft.class)
+public abstract class MixinMinecraft {
+
+	@Shadow public static File func_6240_b() {
+		return null;
+	}
+
+	@Shadow public abstract void func_6261_a(World var1);
+
+	@Shadow public abstract void func_6263_a(World var1, String var2);
+
+	@Inject(method = "func_6247_b", at = @At("HEAD"), cancellable = true)
+	private void onRun(String worldName, CallbackInfo ci) {
+		File levelDat = new File(func_6240_b(), "saves/" + worldName + "/level.dat");
+		if (!levelDat.exists()) {
+			String answer = JOptionPane.showInputDialog(null, "Ender seed (leave blank for no seed)");
+			if (answer != null && !answer.isEmpty()) {
+				long seed;
+				try {
+					seed = Long.parseLong(answer);
+				} catch (NumberFormatException e) {
+					seed = answer.hashCode();
+				}
+				if (!validSeed(seed))
+					JOptionPane.showMessageDialog(null, "Note: this seed could not have been generated normally", "Warning", JOptionPane.WARNING_MESSAGE);
+
+				func_6261_a(null);
+				System.gc();
+				World world = new World(new File(func_6240_b(), "saves"), worldName, seed);
+				if (world.field_1033_r) {
+					func_6263_a(world, "Generating level");
+				} else {
+					func_6263_a(world, "Loading level");
+				}
+
+				ci.cancel();
+			}
+		}
+	}
+
+	// https://twitter.com/Geosquare_/status/1169623192153010176
+	boolean validSeed(long a){long b=18218081,c=1L<<48,d=7847617,e=((((d*((24667315*(a>>>32)+b*(int)a+67552711)>>32)-b*((-4824621*(a>>>32)+d*(int)a+d)>>32))-11)*0xdfe05bcb1365L)%c);return((((0x5deece66dl*e+11)%c)>>16)<<32)+(int)(((0xbb20b4600a69L*e+0x40942de6baL)%c)>>16)==a;}
+
+}

src/main/resources/fabric.mod.json

@@ -1,24 +1,24 @@
 {
   "schemaVersion": 1,
-  "id": "worldgentests",
+  "id": "seedselector",
   "version": "${version}",
 
-  "name": "World Gen Tests",
-  "description": "World Generation Testing to help us find the pack.png seed",
+  "name": "Seed Selector",
+  "description": "Allows you to choose the world seed when generating a world",
   "authors": [
     "Earthcomputer"
   ],
   "contact": {
     "homepage": "https://earthcomputer.net/",
-    "sources": "https://github.com/Earthcomputer/pack-png-mods/world-gen-tests"
+    "sources": "https://github.com/pack-png-mods/seed-selector"
   },
 
   "license": "CC0-1.0",
-  "icon": "assets/worldgentests/icon.png",
+  "icon": "assets/seedselector/icon.png",
 
   "environment": "*",
   "mixins": [
-    "worldgentests.mixins.json"
+    "seedselector.mixins.json"
   ],
 
   "depends": {

src/main/resources/worldgentests.mixins.json → src/main/resources/seedselector.mixins.json

@@ -1,6 +1,6 @@
 {
   "required": true,
-  "package": "net.earthcomputer.worldgentests.mixin",
+  "package": "net.earthcomputer.seedselector.mixin",
   "compatibilityLevel": "JAVA_8",
   "mixins": [
   ],