From f2042be088c1139345c57538c54d41b1653397c5 Mon Sep 17 00:00:00 2001
From: Niklas Kapelle <niklas@kapelle.org>
Date: Tue, 3 Mar 2026 16:02:06 +0100
Subject: [PATCH] mods without a fomod config can now be installed

---
 src/main.rs | 90 +++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 77 insertions(+), 13 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 66b4348..6b7124d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,15 +1,18 @@
 use clap::Parser;
 use log::debug;
-use std::{error::Error, path::Path};
+use std::{
+    error::Error,
+    fs,
+    path::{Path, PathBuf},
+};
 
 use crate::{
     basic_types::{ModConfig, ModFile, ModdedInstance, RootConfig},
     cli::Args,
-    fomod::Config,
     linker::{create_plugins_txt, link_game_to_target, link_instance_to_target},
     load_order::LoadOrder,
     mod_config_installer::FomodInstaller,
-    utils::resolve_case_insensitive,
+    utils::{resolve_case_insensitive, walk_files_recursive},
 };
 
 mod basic_types;
@@ -22,31 +25,92 @@ mod load_order;
 mod mod_config_installer;
 mod utils;
 
-pub fn load_mod_config(mod_root: impl AsRef<Path>) -> Result<fomod::Config, Box<dyn Error>> {
-    let path = resolve_case_insensitive(&mod_root, "fomod/ModuleConfig.xml")?;
-    let mod_config = Config::load_from_file(path)?;
-    Ok(mod_config)
-}
-
 pub fn gen_filelist_for_mod(
     root_config: &RootConfig,
     instance: &ModdedInstance,
     mod_config: &ModConfig,
 ) -> Result<Vec<ModFile>, Box<dyn Error>> {
     let mod_location = root_config.get_mod_location(mod_config);
-    let module_config = load_mod_config(&mod_location)?;
 
+    let module_config_path = resolve_case_insensitive(&mod_location, "fomod/ModuleConfig.xml")?;
+
+    let files: Vec<ModFile> = match module_config_path {
+        Some(path) => {
+            debug!("Found a ModuleConfig.xml");
+            gen_filelist_from_fomod(instance, path, &mod_location)?
+        }
+        None => {
+            debug!("Did not find a ModuleConfig.xml");
+            gen_filelist_from_mod_dir(&mod_location)?
+        }
+    };
+
+    Ok(files)
+}
+
+pub fn gen_filelist_from_mod_dir(
+    mod_location: impl AsRef<Path>,
+) -> Result<Vec<ModFile>, Box<dyn Error>> {
+    // Check for Data dir in root
+    let files = match resolve_case_insensitive(&mod_location, "data")? {
+        Some(data_path) => gen_filelist_from_dir(data_path),
+        None => gen_filelist_from_dir(&mod_location),
+    }?;
+
+    let mod_files: Vec<_> = files
+        .iter()
+        .filter(|e| should_be_included(e))
+        .map(|e| ModFile::new(e, PathBuf::from("Data").join(e), 0))
+        .collect();
+
+    Ok(mod_files)
+}
+
+fn should_be_included(path: impl AsRef<Path>) -> bool {
+    matches!(
+        path.as_ref().extension().and_then(|e| e.to_str()),
+        Some(
+            "esp"
+                | "esm"
+                | "esl"
+                | "bsa"
+                | "ba2"
+                | "bsl"
+                | "ini"
+                | "pex"
+                | "psc"
+                | "strings"
+                | "ilstrings"
+                | "dlstrings"
+                | "dll"
+        )
+    )
+}
+
+pub fn gen_filelist_from_dir(path: impl AsRef<Path>) -> Result<Vec<PathBuf>, Box<dyn Error>> {
+    let files: Vec<_> = walk_files_recursive(&path)?
+        .map(|file| file.path().strip_prefix(&path).unwrap().to_owned())
+        .collect();
+
+    Ok(files)
+}
+
+pub fn gen_filelist_from_fomod(
+    instance: &ModdedInstance,
+    xml_path: impl AsRef<Path>,
+    mod_location: impl AsRef<Path>,
+) -> Result<Vec<ModFile>, Box<dyn Error>> {
+    let module_config = fomod::Config::load_from_file(xml_path)?;
     // TODO: add active plugins from instance config
     let installer = FomodInstaller::new(module_config, vec![], install_prompt::prompt);
-
     let files = installer.run();
 
-    let converted_files: Vec<_> = files
+    let mod_files: Vec<_> = files
         .iter()
         .flat_map(|f| ModFile::from_installer(f.clone(), &mod_location).unwrap())
         .collect();
 
-    Ok(converted_files)
+    Ok(mod_files)
 }
 
 pub fn activate_instance(