Vanilla works but fabric doesn't

src/fabric.rs

@@ -0,0 +1,85 @@
+use std::{
+	fs::{self, File},
+	path::{Path, PathBuf},
+};
+
+use serde_json::Value;
+
+const META_SERVER: &str = "https://meta.fabricmc.net/";
+const MAVEN_SERVER: &str = "https://maven.fabricmc.net/";
+
+fn query_meta_json(path: &str) -> Value {
+	ureq::get(&format!("{META_SERVER}{path}")).call().unwrap().into_json().unwrap()
+}
+
+fn download_maven(url: &str, path: &Path) {
+	fs::create_dir_all(path.parent().unwrap()).unwrap();
+	let mut file = File::create(path).unwrap();
+	if url.starts_with(MAVEN_SERVER) {
+		crate::download::download(&format!("{url}"), &mut file).unwrap();
+	} else {
+		crate::download::download(&format!("{META_SERVER}{url}"), &mut file).unwrap();
+	}
+}
+
+fn library_from_json(json: &Value) -> Option<(String, String)> {
+	let name = json.get("name")?.as_str()?;
+	let url = json.get("url")?.as_str()?;
+
+	// Split "group:artifact:version"
+	let parts: Vec<&str> = name.splitn(3, ':').collect();
+	if parts.len() != 3 {
+		return None;
+	}
+
+	let group = parts[0].replace('.', "/");
+	let artifact = parts[1];
+	let version = parts[2];
+
+	// Build remote URL (like Java's getURL)
+	let jar_name = format!("{artifact}-{version}.jar");
+	let remote_path = format!("{}/{}/{}/{jar_name}", group, artifact, version);
+	let full_url = format!("{}{}", url, remote_path);
+
+	// Build local path (like Java's getPath)
+	let group_fs = parts[0].replace('.', &std::path::MAIN_SEPARATOR.to_string());
+	let local_path = PathBuf::from(group_fs)
+		.join(artifact)
+		.join(version)
+		.join(jar_name)
+		.to_string_lossy()
+		.replace(' ', "_");
+
+	Some((full_url, local_path))
+}
+
+pub fn install_fabric(minecraft_path: &Path, minecraft_version: &str, loader_version: &str) -> Result<(), crate::error::Error> {
+	let profile_name = format!("{minecraft_version}-fabric");
+	let versions_dir = minecraft_path.join("versions");
+	let profile_dir = versions_dir.join(&profile_name);
+	let profile_json = profile_dir.join(format!("{profile_name}.json"));
+	let libs_dir = minecraft_path.join("libraries");
+
+	let json = query_meta_json(&format!("v2/versions/loader/{minecraft_version}/{loader_version}/profile/json"));
+
+	fs::create_dir_all(&profile_dir).unwrap();
+
+	fs::write(&profile_json, json.to_string()).unwrap();
+
+	fs::copy(
+		versions_dir.join(minecraft_version).join(format!("{minecraft_version}.jar")),
+		profile_dir.join(profile_name + ".jar"),
+	)
+	.unwrap();
+
+	for lib_json in json.get("libraries").unwrap().as_array().unwrap() {
+		if let Some((url, path)) = library_from_json(lib_json) {
+			let lib_file = libs_dir.join(path);
+			download_maven(&url, &lib_file);
+		} else {
+			eprintln!("Failed to get json from {lib_json}")
+		}
+	}
+
+	Ok(())
+}