added basic unpacker

src/unpacker.rs

@@ -0,0 +1,28 @@
+use std::{fs, path::Path};
+
+use anyhow::anyhow;
+
+use crate::types::{ModConfig, RootConfig};
+
+pub fn unpack(
+    root_config: &RootConfig,
+    id: &str,
+    path: impl AsRef<Path>,
+) -> anyhow::Result<ModConfig> {
+    let extract_to = root_config.mod_location().join(id);
+
+    if fs::exists(&extract_to)? {
+        return Err(anyhow!("File already exists"));
+    }
+
+    unpack_7z_file(path, &extract_to)?;
+
+    let new_mod = ModConfig::new(id, id);
+
+    Ok(new_mod)
+}
+
+fn unpack_7z_file(path: impl AsRef<Path>, to: impl AsRef<Path>) -> anyhow::Result<()> {
+    sevenz_rust::decompress_file(path, to)?;
+    Ok(())
+}