unnest archives with only one dir in it

src/unpacker.rs

@@ -1,6 +1,9 @@
-use std::{fs, path::Path};
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
 
-use anyhow::anyhow;
+use anyhow::{Ok, anyhow};
 use log::error;
 use zip::ZipArchive;
 
@@ -29,6 +32,8 @@ pub fn unpack(archive_path: impl AsRef<Path>, extract_to: impl AsRef<Path>) -> a
         }
     }?;
 
+    unnest_dir(extract_to)?;
+
     Ok(())
 }
 
@@ -53,3 +58,47 @@ fn unpack_rar(path: impl AsRef<Path>, to: impl AsRef<Path>) -> anyhow::Result<()
 
     Ok(())
 }
+
+/// Moves a directorys content into the parent if it is the only dir
+fn unnest_dir(path: impl AsRef<Path>) -> anyhow::Result<()> {
+    let path = path.as_ref();
+
+    let Some(nested_dir) = check_nested_dir(path) else {
+        return Ok(());
+    };
+
+    for entry in fs::read_dir(&nested_dir)? {
+        let entry = entry?;
+        let src = entry.path();
+        let dest = path.join(entry.file_name());
+        fs::rename(&src, &dest)?;
+    }
+
+    fs::remove_dir(&nested_dir)?;
+    Ok(())
+}
+
+/// Check if the extracted archive has a single directory in it which contains the mod files
+fn check_nested_dir(path: impl AsRef<Path>) -> Option<PathBuf> {
+    let path = path.as_ref();
+
+    let entries: Vec<_> = fs::read_dir(path).ok()?.filter_map(|e| e.ok()).collect();
+
+    if entries.len() == 1 {
+        let entry = &entries[0];
+        let entry_path = entry.path();
+
+        if entry_path
+            .file_name()
+            .is_some_and(|e| e == "Data" || e == "data")
+        {
+            return None;
+        }
+
+        if entry_path.is_dir() {
+            return Some(entry_path);
+        }
+    }
+
+    None
+}