Fix #120

Author: theRookieCoder

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Fix [#118](https://github.com/gorilla-devs/ferium/issues/118), the `--output-dir` flag is now optional
 - Fix [#111](https://github.com/gorilla-devs/ferium/issues/111)
 - Fix [#121](https://github.com/gorilla-devs/ferium/issues/121), the add command just shows a warning for optional mods that are incompatible
+- Fix [#120](https://github.com/gorilla-devs/ferium/issues/120), duplicate files are no longer downloaded. Also, a warning so that you remove the duplicate mod
 
 ## `v4.1.1`
 ### 31.05.2022

src/download.rs

@@ -29,6 +29,20 @@ pub async fn clean(
     to_download: &mut Vec<Downloadable>,
     to_install: &mut Vec<(OsString, PathBuf)>,
 ) -> Result<()> {
+    let len = to_download.len();
+    to_download.sort_unstable_by_key(|downloadable| downloadable.output.clone());
+    to_download.dedup_by_key(|downloadable| downloadable.output.clone());
+    if to_download.len() < len {
+        println!(
+            "{}",
+            format!(
+                "Warning: {} duplicate files were found, please check your mods for duplicates!",
+                len - to_download.len()
+            )
+            .yellow()
+            .bold()
+        );
+    }
     create_dir_all(directory.join(".old")).await?;
     for file in read_dir(&directory)? {
         let file = file?;