Mod dependency sorting with only exact version matching

src/lib.rs

@@ -18,7 +18,7 @@ pub struct ModInfo {
     pub version: (i64, i64, i64),
     pub website_url: String,
     pub enabled: bool,
-    pub dependencies: Vec<Option<DependencyString>>,
+    pub dependencies: Vec<DependencyString>,
 }
 
 impl ModInfo {
@@ -36,7 +36,7 @@ impl ModInfo {
             dependencies: yaml["dependencies"]
                 .as_vec()?
                 .iter()
-                .map(|y| y.as_str().map(|str| str.to_owned()))
+                .filter_map(|y| y.as_str().map(|str| str.to_owned()))
                 .collect(),
         })
     }
@@ -226,6 +226,6 @@ pub fn game_dir() -> PathBuf {
     match var("GAME_DIR").ok() {
         Some(game_dir) => game_dir.into(),
         None => PathBuf::from(var("HOME").unwrap())
-            .join(".steam/steam/steamapps/common/Lethal Company"),
+            .join("steam/SteamLibrary/steamapps/common/Lethal Company"),
     }
 }

src/main.rs

@@ -32,6 +32,7 @@ fn main() {
     };
 
     let mod_list = fetch_mod_list(&profile_fetcher, &profile_uuid).unwrap();
+    let mod_list = sort_by_dependencies(&mod_list);
     fetch_mods(&mod_fetcher, &mod_list).unwrap();
 
     println!("");
@@ -80,26 +81,70 @@ fn fetch_mod_list(
     // Handle yaml
     let mods = &YamlLoader::load_from_str(&mods_yaml)?[0];
 
-    Ok(sort_mods(
-        &mods
-            .as_vec()
-            .ok_or(std::io::Error::new(
-                std::io::ErrorKind::Other,
-                format!("YAML file is not a list: {:?}", mods_yaml_path),
-            ))?
-            .iter()
-            .filter(|yaml| yaml["enabled"] == Yaml::Boolean(true))
-            .map(|yaml| ModInfo::from_yaml(yaml).unwrap())
-            .collect(),
-    ))
+    Ok(mods
+        .as_vec()
+        .ok_or(std::io::Error::new(
+            std::io::ErrorKind::Other,
+            format!("YAML file is not a list: {:?}", mods_yaml_path),
+        ))?
+        .iter()
+        .filter(|yaml| yaml["enabled"] == Yaml::Boolean(true))
+        .map(|yaml| ModInfo::from_yaml(yaml).unwrap())
+        .collect())
 }
 
-/// Sort mods by dependency order
-fn sort_mods(mods: &Vec<ModInfo>) -> Vec<ModInfo> {
-    // TODO: Actual dependecy sorting
+/// Sort mods so that dependencies are installed before dependants
+fn sort_by_dependencies(mods: &Vec<ModInfo>) -> Vec<ModInfo> {
+    let mut resolved_mods: Vec<ModInfo> = Vec::with_capacity(mods.len());
     let mut mods = mods.clone();
+    // Sort mods initially by their dependency count, so we are more likely to hit them in order
     mods.sort_unstable_by_key(|mod_info| mod_info.dependencies.len());
-    mods
+
+    let mut unsatisfied_iterations: Vec<Vec<ModInfo>> = vec![];
+
+    while mods.len() > 0 {
+        // Find a mod with satisfied dependencies
+        let index = mods
+            .iter()
+            .enumerate()
+            .find(|(_, mod_info)| {
+                mod_info.dependencies.iter().all(|dependency| {
+                    resolved_mods
+                        .iter()
+                        .any(|resolved| *dependency == resolved.dependency_string())
+                })
+            })
+            .map(|(index, _)| index);
+        if index.is_none() {
+            unsatisfied_iterations.push(mods.clone());
+        }
+        // Even if no mods were satisfied, just pick one.
+        resolved_mods.push(mods.remove(index.unwrap_or(0)));
+    }
+
+    if unsatisfied_iterations.len() > 0 {
+        eprintln!(
+            "{} unsatisfied dependencies:\n{:?}\n",
+            unsatisfied_iterations[0].len(),
+            unsatisfied_iterations[0]
+        );
+
+        eprintln!(
+            "Unsatisfied iterations:\n{:?}\n",
+            unsatisfied_iterations
+                .iter()
+                .map(|list| {
+                    let list = list
+                        .iter()
+                        .map(|mod_info| mod_info.name.clone())
+                        .collect::<Vec<String>>();
+                    format!("({} unsatisfied) {:?}", list.len(), list)
+                })
+                .collect::<Vec<String>>()
+        );
+    }
+
+    resolved_mods
 }
 
 /// Download and extract mods