.editorconfig

@@ -14,5 +14,5 @@ max_line_length = 100
 max_line_length = off
 trim_trailing_whitespace = false
 
-[*.rs]
-indent_size = 4
+[*.{rs,java,kts}]
+indent_size = 4

.idea/code.iml

@@ -17,4 +17,4 @@
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
-</module>
+</module>

.idea/modules.xml

@@ -5,4 +5,4 @@
       <module fileurl="file://$PROJECT_DIR$/.idea/code.iml" filepath="$PROJECT_DIR$/.idea/code.iml" />
     </modules>
   </component>
-</project>
+</project>

packages/app-lib/Cargo.toml

@@ -76,6 +76,9 @@ ariadne.workspace = true
 [target.'cfg(windows)'.dependencies]
 winreg.workspace = true
 
+[build-dependencies]
+dunce.workspace = true
+
 [features]
 tauri = ["dep:tauri"]
 cli = ["dep:indicatif"]

packages/app-lib/build.rs

@@ -0,0 +1,44 @@
+use std::ffi::OsString;
+use std::path::PathBuf;
+use std::process::{Command, exit};
+use std::{env, fs};
+
+fn main() {
+    println!("cargo::rerun-if-changed=java/gradle");
+    println!("cargo::rerun-if-changed=java/src");
+    println!("cargo::rerun-if-changed=java/build.gradle.kts");
+    println!("cargo::rerun-if-changed=java/settings.gradle.kts");
+    println!("cargo::rerun-if-changed=java/gradle.properties");
+
+    let out_dir =
+        dunce::canonicalize(PathBuf::from(env::var_os("OUT_DIR").unwrap()))
+            .unwrap();
+
+    println!(
+        "cargo::rustc-env=JAVA_JARS_DIR={}",
+        out_dir.join("java/libs").display()
+    );
+
+    let gradle_path = fs::canonicalize(
+        #[cfg(target_os = "windows")]
+        "java\\gradlew.bat",
+        #[cfg(not(target_os = "windows"))]
+        "java/gradlew",
+    )
+    .unwrap();
+
+    let mut build_dir_str = OsString::from("-Dorg.gradle.project.buildDir=");
+    build_dir_str.push(out_dir.join("java"));
+    let exit_status = Command::new(gradle_path)
+        .arg(build_dir_str)
+        .arg("build")
+        .arg("--no-daemon")
+        .arg("--console=rich")
+        .current_dir(dunce::canonicalize("java").unwrap())
+        .status()
+        .expect("Failed to wait on Gradle build");
+    if !exit_status.success() {
+        println!("cargo::error=Gradle build failed with {exit_status}");
+        exit(exit_status.code().unwrap_or(1));
+    }
+}

packages/app-lib/java/.gitattributes

@@ -0,0 +1,12 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
+# Binary files should be left untouched
+*.jar           binary
+

packages/app-lib/java/.gitignore

@@ -0,0 +1,5 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

packages/app-lib/java/build.gradle.kts

@@ -0,0 +1,43 @@
+plugins {
+    java
+    id("com.diffplug.spotless") version "7.0.4"
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(libs.junit.jupiter)
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(8)
+    }
+}
+
+tasks.withType<JavaCompile>().configureEach {
+    options.compilerArgs.addAll(listOf("-Xlint:all", "-Werror"))
+}
+
+spotless {
+    java {
+        palantirJavaFormat()
+        removeUnusedImports()
+    }
+}
+
+tasks.jar {
+    archiveFileName = "theseus.jar"
+}
+
+tasks.named<Test>("test") {
+    useJUnitPlatform()
+}
+
+tasks.withType<AbstractArchiveTask>().configureEach {
+    isPreserveFileTimestamps = false
+    isReproducibleFileOrder = true
+}

packages/app-lib/java/gradle.properties

@@ -0,0 +1,5 @@
+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/build_environment.html#sec:gradle_configuration_properties
+
+org.gradle.configuration-cache=true
+

packages/app-lib/java/gradle/libs.versions.toml

@@ -0,0 +1,5 @@
+[versions]
+junit-jupiter = "5.12.1"
+
+[libraries]
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }

packages/app-lib/java/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.2-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

packages/app-lib/java/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

packages/app-lib/java/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

packages/app-lib/java/settings.gradle.kts

@@ -0,0 +1,6 @@
+plugins {
+    // Apply the foojay-resolver plugin to allow automatic download of JDKs
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.10.0"
+}
+
+rootProject.name = "theseus"

packages/app-lib/java/src/main/java/com/modrinth/theseus/JavaInfo.java

@@ -0,0 +1,21 @@
+package com.modrinth.theseus;
+
+public final class JavaInfo {
+    private static final String[] CHECKED_PROPERTIES = new String[] {"os.arch", "java.version"};
+
+    public static void main(String[] args) {
+        int returnCode = 0;
+
+        for (String key : CHECKED_PROPERTIES) {
+            String property = System.getProperty(key);
+
+            if (property != null) {
+                System.out.println(key + "=" + property);
+            } else {
+                returnCode = 1;
+            }
+        }
+
+        System.exit(returnCode);
+    }
+}

packages/app-lib/java/src/main/java/com/modrinth/theseus/MinecraftLaunch.java

@@ -0,0 +1,118 @@
+package com.modrinth.theseus;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+
+public final class MinecraftLaunch {
+    public static void main(String[] args) throws IOException, ReflectiveOperationException {
+        final String mainClass = args[0];
+        final String[] gameArgs = Arrays.copyOfRange(args, 1, args.length);
+
+        System.setProperty("modrinth.process.args", String.join("\u001f", gameArgs));
+        parseInput();
+
+        relaunch(mainClass, gameArgs);
+    }
+
+    private static void parseInput() throws IOException {
+        final ByteArrayOutputStream line = new ByteArrayOutputStream();
+        while (true) {
+            final int b = System.in.read();
+            if (b < 0) {
+                throw new IllegalStateException("Stdin terminated while parsing");
+            }
+            if (b != '\n') {
+                line.write(b);
+                continue;
+            }
+            if (handleLine(line.toString("UTF-8"))) {
+                break;
+            }
+            line.reset();
+        }
+    }
+
+    private static boolean handleLine(String line) {
+        final String[] parts = line.split("\t", 2);
+        switch (parts[0]) {
+            case "property": {
+                final String[] keyValue = parts[1].split("\t", 2);
+                System.setProperty(keyValue[0], keyValue[1]);
+                return false;
+            }
+            case "launch":
+                return true;
+        }
+
+        System.err.println("Unknown input line " + line);
+        return false;
+    }
+
+    private static void relaunch(String mainClassName, String[] args) throws ReflectiveOperationException {
+        final int javaVersion = getJavaVersion();
+        final Class<?> mainClass = Class.forName(mainClassName);
+
+        if (javaVersion >= 25) {
+            Method mainMethod;
+            try {
+                mainMethod = findMainMethodJep512(mainClass);
+            } catch (ReflectiveOperationException e) {
+                System.err.println(
+                        "[MODRINTH] Unable to call JDK findMainMethod. Falling back to pre-Java 25 main method finding.");
+                // If the above fails due to JDK implementation details changing
+                try {
+                    mainMethod = findSimpleMainMethod(mainClass);
+                } catch (ReflectiveOperationException innerE) {
+                    e.addSuppressed(innerE);
+                    throw e;
+                }
+            }
+            if (mainMethod == null) {
+                throw new IllegalArgumentException("Could not find main() method");
+            }
+
+            Object thisObject = null;
+            if (!Modifier.isStatic(mainMethod.getModifiers())) {
+                thisObject = mainClass.getDeclaredConstructor().newInstance();
+            }
+
+            final Object[] parameters = mainMethod.getParameterCount() > 0 ? new Object[] {args} : new Object[] {};
+
+            mainMethod.invoke(thisObject, parameters);
+        } else {
+            findSimpleMainMethod(mainClass).invoke(null, new Object[] {args});
+        }
+    }
+
+    private static int getJavaVersion() {
+        String javaVersion = System.getProperty("java.version");
+
+        final int dotIndex = javaVersion.indexOf('.');
+        if (dotIndex != -1) {
+            javaVersion = javaVersion.substring(0, dotIndex);
+        }
+
+        final int dashIndex = javaVersion.indexOf('-');
+        if (dashIndex != -1) {
+            javaVersion = javaVersion.substring(0, dashIndex);
+        }
+
+        return Integer.parseInt(javaVersion);
+    }
+
+    private static Method findMainMethodJep512(Class<?> mainClass) throws ReflectiveOperationException {
+        // BEWARE BELOW: This code may break if JDK internals to find the main method
+        // change.
+        final Class<?> methodFinderClass = Class.forName("jdk.internal.misc.MethodFinder");
+        final Method methodFinderMethod = methodFinderClass.getDeclaredMethod("findMainMethod", Class.class);
+        final Object result = methodFinderMethod.invoke(null, mainClass);
+        return (Method) result;
+    }
+
+    private static Method findSimpleMainMethod(Class<?> mainClass) throws NoSuchMethodException {
+        return mainClass.getMethod("main", String[].class);
+    }
+}

packages/app-lib/library/JavaInfo.java

@@ -1,22 +0,0 @@
-public final class JavaInfo {
-  private static final String[] CHECKED_PROPERTIES = new String[] {
-      "os.arch",
-      "java.version"
-  };
-
-  public static void main(String[] args) {
-    int returnCode = 0;
-
-    for (String key : CHECKED_PROPERTIES) {
-      String property = System.getProperty(key);
-
-      if (property != null) {
-        System.out.println(key + "=" + property);
-      } else {
-        returnCode = 1;
-      }
-    }
-
-    System.exit(returnCode);
-  }
-}

packages/app-lib/library/MinecraftLaunch.java

@@ -1,118 +0,0 @@
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
-import java.util.Arrays;
-
-public final class MinecraftLaunch {
-  public static void main(String[] args) throws IOException, ReflectiveOperationException {
-    final String mainClass = args[0];
-    final String[] gameArgs = Arrays.copyOfRange(args, 1, args.length);
-
-    System.setProperty("modrinth.process.args", String.join("\u001f", gameArgs));
-    parseInput();
-
-    relaunch(mainClass, gameArgs);
-  }
-
-  private static void parseInput() throws IOException {
-    final ByteArrayOutputStream line = new ByteArrayOutputStream();
-    while (true) {
-      final int b = System.in.read();
-      if (b < 0) {
-        throw new IllegalStateException("Stdin terminated while parsing");
-      }
-      if (b != '\n') {
-        line.write(b);
-        continue;
-      }
-      if (handleLine(line.toString("UTF-8"))) {
-        break;
-      }
-      line.reset();
-    }
-  }
-
-  private static boolean handleLine(String line) {
-    final String[] parts = line.split("\t", 2);
-    switch (parts[0]) {
-      case "property": {
-        final String[] keyValue = parts[1].split("\t", 2);
-        System.setProperty(keyValue[0], keyValue[1]);
-        return false;
-      }
-      case "launch":
-        return true;
-    }
-
-    System.err.println("Unknown input line " + line);
-    return false;
-  }
-
-  private static void relaunch(String mainClassName, String[] args) throws ReflectiveOperationException {
-    final int javaVersion = getJavaVersion();
-    final Class<?> mainClass = Class.forName(mainClassName);
-
-    if (javaVersion >= 25) {
-      Method mainMethod;
-      try {
-        mainMethod = findMainMethodJep512(mainClass);
-      } catch (ReflectiveOperationException e) {
-        System.err
-            .println("[MODRINTH] Unable to call JDK findMainMethod. Falling back to pre-Java 25 main method finding.");
-        // If the above fails due to JDK implementation details changing
-        try {
-          mainMethod = findSimpleMainMethod(mainClass);
-        } catch (ReflectiveOperationException innerE) {
-          e.addSuppressed(innerE);
-          throw e;
-        }
-      }
-      if (mainMethod == null) {
-        throw new IllegalArgumentException("Could not find main() method");
-      }
-
-      Object thisObject = null;
-      if (!Modifier.isStatic(mainMethod.getModifiers())) {
-        thisObject = mainClass.getDeclaredConstructor().newInstance();
-      }
-
-      final Object[] parameters = mainMethod.getParameterCount() > 0
-          ? new Object[] { args }
-          : new Object[] {};
-
-      mainMethod.invoke(thisObject, parameters);
-    } else {
-      findSimpleMainMethod(mainClass).invoke(null, new Object[] { args });
-    }
-  }
-
-  private static int getJavaVersion() {
-    String javaVersion = System.getProperty("java.version");
-
-    final int dotIndex = javaVersion.indexOf('.');
-    if (dotIndex != -1) {
-      javaVersion = javaVersion.substring(0, dotIndex);
-    }
-
-    final int dashIndex = javaVersion.indexOf('-');
-    if (dashIndex != -1) {
-      javaVersion = javaVersion.substring(0, dashIndex);
-    }
-
-    return Integer.parseInt(javaVersion);
-  }
-
-  private static Method findMainMethodJep512(Class<?> mainClass) throws ReflectiveOperationException {
-    // BEWARE BELOW: This code may break if JDK internals to find the main method
-    // change.
-    final Class<?> methodFinderClass = Class.forName("jdk.internal.misc.MethodFinder");
-    final Method methodFinderMethod = methodFinderClass.getDeclaredMethod("findMainMethod", Class.class);
-    final Object result = methodFinderMethod.invoke(null, mainClass);
-    return (Method) result;
-  }
-
-  private static Method findSimpleMainMethod(Class<?> mainClass) throws NoSuchMethodException {
-    return mainClass.getMethod("main", String[].class);
-  }
-}

packages/app-lib/src/launcher/mod.rs

@@ -590,7 +590,7 @@ pub async fn launch_minecraft(
     }
 
     let (main_class_keep_alive, main_class_path) =
-        get_resource_file!("../../library" / "MinecraftLaunch.class")?;
+        get_resource_file!(env "JAVA_JARS_DIR" / "theseus.jar")?;
 
     command.args(
         args::get_jvm_arguments(
@@ -602,7 +602,7 @@ pub async fn launch_minecraft(
             &args::get_class_paths(
                 &state.directories.libraries_dir(),
                 version_info.libraries.as_slice(),
-                &[main_class_path.parent().unwrap(), &client_path],
+                &[&main_class_path, &client_path],
                 &java_version.architecture,
                 minecraft_updated,
             )?,
@@ -625,7 +625,7 @@ pub async fn launch_minecraft(
     }
 
     command
-        .arg("MinecraftLaunch")
+        .arg("com.modrinth.theseus.MinecraftLaunch")
         .arg(version_info.main_class.clone())
         .args(
             args::get_minecraft_arguments(

packages/app-lib/src/util/io.rs

@@ -302,7 +302,7 @@ pub async fn metadata(
 /// Gets a resource file from the executable. Returns `theseus::Result<(TempDir, PathBuf)>`.
 #[macro_export]
 macro_rules! get_resource_file {
-    ($relative_dir:literal / $file_name:literal) => {
+    (directory: $relative_dir:expr, file: $file_name:expr) => {
         'get_resource_file: {
             let dir = match tempfile::tempdir() {
                 Ok(dir) => dir,
@@ -330,4 +330,12 @@ macro_rules! get_resource_file {
             $crate::Result::Ok((dir, path))
         }
     };
+
+    ($relative_dir:literal / $file_name:literal) => {
+        get_resource_file!(directory: $relative_dir, file: $file_name)
+    };
+
+    (env $dir_env_name:literal / $file_name:literal) => {
+        get_resource_file!(directory: env!($dir_env_name), file: $file_name)
+    };
 }

packages/app-lib/src/util/jre.rs

@@ -273,12 +273,12 @@ pub async fn check_java_at_filepath(path: &Path) -> crate::Result<JavaVersion> {
     };
 
     let (_temp, file_path) =
-        get_resource_file!("../../library" / "JavaInfo.class")?;
+        get_resource_file!(env "JAVA_JARS_DIR" / "theseus.jar")?;
 
     let output = Command::new(&java)
         .arg("-cp")
-        .arg(file_path.parent().unwrap())
-        .arg("JavaInfo")
+        .arg(file_path)
+        .arg("com.modrinth.theseus.JavaInfo")
         .env_remove("_JAVA_OPTIONS")
         .output()?;