Conflicting libraries fix

src/fabric.rs

@@ -4,6 +4,7 @@ use std::{
 };
 
 use serde_json::Value;
+use walkdir::WalkDir;
 
 const META_SERVER: &str = "https://meta.fabricmc.net/";
 const MAVEN_SERVER: &str = "https://maven.fabricmc.net/";
@@ -22,7 +23,7 @@ fn download_maven(url: &str, path: &Path) {
 	}
 }
 
-fn library_from_json(json: &Value) -> Option<(String, String)> {
+fn library_from_json(json: &Value) -> Option<(String, String, String)> {
 	let name = json.get("name")?.as_str()?;
 	let url = json.get("url")?.as_str()?;
 
@@ -50,7 +51,7 @@ fn library_from_json(json: &Value) -> Option<(String, String)> {
 		.to_string_lossy()
 		.replace(' ', "_");
 
-	Some((full_url, local_path))
+	Some((name.to_string(), full_url, local_path))
 }
 
 pub fn install_fabric(minecraft_path: &Path, minecraft_version: &str, loader_version: &str) -> Result<(), crate::error::Error> {
@@ -60,6 +61,11 @@ pub fn install_fabric(minecraft_path: &Path, minecraft_version: &str, loader_ver
 	let profile_json = profile_dir.join(format!("{profile_name}.json"));
 	let libs_dir = minecraft_path.join("libraries");
 
+	let mut libs = WalkDir::new(&libs_dir)
+		.into_iter()
+		.filter_map(|e| e.ok())
+		.filter(|e| e.file_type().is_file());
+
 	let mut json = query_meta_json(&format!("v2/versions/loader/{minecraft_version}/{loader_version}/profile/json"));
 
 	*json.get_mut("id").unwrap() = Value::String(profile_name.clone());
@@ -75,9 +81,15 @@ pub fn install_fabric(minecraft_path: &Path, minecraft_version: &str, loader_ver
 	.unwrap();
 
 	for lib_json in json.get("libraries").unwrap().as_array().unwrap() {
-		if let Some((url, path)) = library_from_json(lib_json) {
+		if let Some((name, url, path)) = library_from_json(lib_json) {
 			let lib_file = libs_dir.join(path);
-			download_maven(&url, &lib_file);
+			let lib_id = lib_file.parent().unwrap().parent().unwrap(); // Removes the version/lib.jar
+			if !libs.any(|e| e.path().starts_with(lib_id)) {
+				println!("Installing library '{name}'");
+				download_maven(&url, &lib_file);
+			} else {
+				println!("library '{name}' Already exists, skipping");
+			}
 		} else {
 			eprintln!("Failed to get json from {lib_json}")
 		}