From 73e2f771d1dbf196d3bd27a0c69ce1430753d13c Mon Sep 17 00:00:00 2001
From: stuin <stuin01@gmail.com>
Date: Mon, 31 Mar 2025 16:21:37 -0700
Subject: [PATCH] Add neoforge support

---
 install.py          |  2 +
 neoforge_install.py | 93 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 neoforge_install.py

diff --git a/install.py b/install.py
index 914bd58..34dae5d 100644
--- a/install.py
+++ b/install.py
@@ -18,6 +18,7 @@
 import pathlib
 
 import forge_install
+import neoforge_install
 import fabric_install
 import mod_download
 from zipfile import ZipFile
@@ -211,6 +212,7 @@ def main(zipfile,
     # * manual flag: run automatically or show GUI
     modloaders = {
         'forge': forge_install,
+        'neoforge': neoforge_install,
         'fabric': fabric_install
     }
 
diff --git a/neoforge_install.py b/neoforge_install.py
new file mode 100644
index 0000000..57d511a
--- /dev/null
+++ b/neoforge_install.py
@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+import os
+import re
+import subprocess
+import sys
+import time
+from util import *
+
+# https://files.minecraftforge.net/maven/net/minecraftforge/forge/1.12.2-14.23.5.2847/forge-1.12.2-14.23.5.2847-universal.jar
+
+def get_neoforge_url(mcver, mlver):
+    index_url = 'https://maven.neoforged.net/releases/net/neoforged/neoforge/index.html'
+
+    outpath = '/tmp/neoforge-%s-index.html' % mcver
+    if not os.path.exists(outpath):
+        resp = download(index_url, outpath, False)
+        if resp != 200:
+            print("Got %d error trying to download NeoForge download index" % resp)
+            return ""
+
+    with open(outpath, 'r') as f:
+        match = re.search(r"href=\".*(https://maven\.neoforged\.net/.*-%s-.*\.jar)\"" % mlver, f.read())
+        if match:
+            url = match.group(1)
+        else:
+            print("Could not find NeoForge download URL for version %s (Minecraft version %s)" % (mlver, mcver))
+            return ""
+
+    return url
+
+def guess_neoforge_url(mcver, mlver):
+    neoforge_fullver = mlver
+    return 'https://maven.neoforged.net/releases/net/neoforged/neoforge/%s/neoforge-%s-installer.jar' % (neoforge_fullver, neoforge_fullver)
+
+def main(manifest, mcver, mlver, packname, mc_dir, manual):
+    url_providers = [guess_neoforge_url, get_neoforge_url]
+
+    outpath = '/tmp/neoforge-%s-installer.jar' % (mcver + '-' + mlver)
+
+    for provider in url_providers:
+        if os.path.exists(outpath):
+            break
+        url = provider(mcver, mlver)
+
+        resp = download(url, outpath, True)
+        if resp != 200:
+            print("Got %d error trying to download NeoForge" % resp)
+
+    if not os.path.exists(outpath):
+        print("Failed to download the NeoForge installer.")
+        sys.exit(2)
+
+    # Run the Forge auto-install hack
+    if manual:
+        print("Using the manual installer!")
+        print("***** NEW: INSTALL TO THE MAIN .MINECRAFT DIRECTORY *****")
+        print("*****   (Just hit 'OK' with the default settings)   *****")
+        for i in range(20):
+            print("^ ", end="", flush=True)
+            time.sleep(0.05)
+
+        subprocess.run(['java', '-jar', outpath])
+    else:
+        compile_hack = False
+        if not os.path.exists('ForgeHack.class'):
+            compile_hack = True
+        else:
+            src_modtime = os.stat('ForgeHack.java').st_mtime
+            cls_modtime = os.stat('ForgeHack.class').st_mtime
+            if src_modtime > cls_modtime:
+                print("hack source file updated, recompiling")
+                compile_hack = True
+
+        if compile_hack:
+            subprocess.run(['javac', 'ForgeHack.java'])
+        exit_code = subprocess.run(['java', 'ForgeHack', outpath, mc_dir]).returncode
+        if exit_code != 0:
+            print("Error running the auto-installer, try using --manual.")
+            sys.exit(3)
+
+    ver_id = get_version_id(mcver, mlver)
+    if not os.path.exists(mc_dir + '/versions/' + ver_id):
+        print("NeoForge installation not found.")
+        if manual:
+            print("Make sure you browsed to the correct minecraft directory.")
+        print("Expected to find a directory named %s in %s" % (ver_id, mc_dir + '/versions'))
+        print("If a similarly named directory was created in the expected folder, please submit a")
+        print("bug report.")
+        sys.exit(3)
+
+
+def get_version_id(mcver, mlver):
+    return "neoforge-%s" % mlver