Fix #22: Try to find data files if wrong case for non-Windows platforms

src/openloco/envionment.cpp

@@ -21,6 +21,9 @@ namespace openloco::environment
     loco_global_array<char, 257, 0x0050B635> _path_objects;
 
     static fs::path get_sub_path(path_id id);
+#ifndef _WIN32
+    static fs::path find_similar_file(const fs::path& path);
+#endif
 
     static bool validate_loco_install_path(const fs::path& path)
     {
@@ -31,7 +34,15 @@ namespace openloco::environment
         else
         {
             auto g1Path = path / get_sub_path(path_id::g1);
-            return fs::exists(g1Path);
+            bool g1Exists = fs::exists(g1Path);
+#ifndef _WIN32
+            if (!g1Exists)
+            {
+                g1Path = find_similar_file(g1Path);
+                g1Exists = !g1Path.empty();
+            }
+#endif
+            return g1Exists;
         }
     }
 
@@ -101,6 +112,27 @@ namespace openloco::environment
         return _path_install.get();
     }
 
+#ifndef _WIN32
+    /**
+     * Performs a case-insensitive search on the containing directory of
+     * the given file and returns the first match.
+     */
+    static fs::path find_similar_file(const fs::path& path)
+    {
+        auto expectedFilename = path.filename().generic_string();
+        auto directory = path.parent_path();
+        for (auto& item : fs::directory_iterator(directory))
+        {
+            auto& p = item.path();
+            if (utility::iequals(p.filename().generic_string(), expectedFilename))
+            {
+                return p;
+            }
+        }
+        return fs::path();
+    }
+#endif // _WIN32
+
     // 0x004416B5
     fs::path get_path(path_id id)
     {
@@ -109,7 +141,15 @@ namespace openloco::environment
         auto result = basePath / subPath;
         if (!fs::exists(result))
         {
-            std::cerr << "File not found: " << result << std::endl;
+#ifndef _WIN32
+            result = find_similar_file(result);
+            if (result.empty())
+            {
+#endif
+                std::cerr << "File not found: " << result << std::endl;
+#ifndef _WIN32
+            }
+#endif
         }
         return result;
     }