for legacy scenarios, help open readme or load prefab

src/game/boe.dlgutil.cpp

@@ -31,6 +31,7 @@
 #include "utility.hpp"
 #include "mathutil.hpp"
 #include "dialogxml/dialogs/strdlog.hpp"
+#include "dialogxml/dialogs/btnpanel.hpp"
 #include "dialogxml/dialogs/choicedlog.hpp"
 #include "gfx/render_shapes.hpp"
 #include "tools/winutil.hpp"
@@ -63,8 +64,10 @@ extern std::shared_ptr<cScrollbar> text_sbar,item_sbar,shop_sbar;
 extern std::shared_ptr<cButton> done_btn, help_btn;
 extern bool map_visible;
 extern cUniverse univ;
+extern cCustomGraphics spec_scen_g;
 extern std::map<eSkill,short> skill_max;
 extern void give_help_and_record(short help1, short help2, bool help_forced = false);
+extern void post_load();
 
 short sign_mode,person_graphic,store_person_graphic,store_sign_mode;
 long num_talk_entries;
@@ -1837,12 +1840,55 @@ class cChooseScenario {
 			prefab.prog_make_ver[1] = 0;
 			prefab.prog_make_ver[2] = 0;
 			me.setResult<scen_header_type>(prefab);
+			me.toast(true);
 		} else {
 			int scen_hit = which + (page - 1) * 3;
 			if(scen_hit >= scen_headers.size()) return false;
-			me.setResult<scen_header_type>(scen_headers[scen_hit]);
+			
+			// Show text files, Offer to load prefab party
+			auto scen = scen_headers[scen_hit];
+			std::vector<fs::path> files = extra_files(locate_scenario(scen.file));
+			if(!files.empty()){
+				std::vector<std::string> choices;
+				std::vector<std::function<void(cButtonPanel&)>> handlers;
+
+				for(fs::path file : files){
+					std::string ext = file.extension().string();
+					std::transform(ext.begin(), ext.end(), ext.begin(), tolower);
+					if(ext == ".sav"){
+						choices.push_back("Load premade party: " + file.filename().string());
+						handlers.push_back([file](cButtonPanel&) -> void {
+							if(!load_party(file, univ, spec_scen_g)) {
+								std::cout << "Failed to load save file: " << file << std::endl;
+							}else{
+								finish_load_party();
+								if(overall_mode != MODE_STARTUP)
+									post_load();
+							}
+						});
+					}else{
+						choices.push_back("Open file: " + file.filename().string());
+						handlers.push_back([file](cButtonPanel&) -> void {
+							launchURL("file://" + file.string());
+						});
+					}
+				}
+
+				cButtonPanel panel(choices, handlers, scen.name, "Launch", &me);
+				dynamic_cast<cPict&>(panel->getControl("pic")).setPict(scen.intro_pic,PIC_SCEN);
+				if(panel.show()){
+					// Launch pressed.
+					me.setResult<scen_header_type>(scen);
+					me.toast(true);
+				};
+			}
+			// No extra files. Just launch
+			else{
+				me.setResult<scen_header_type>(scen);
+				me.toast(true);
+			}
+
 		}
-		me.toast(true);
 		return true;
 	}
 

src/game/boe.fileio.cpp

@@ -553,3 +553,27 @@ void try_auto_save(std::string reason) {
 	}
 	print_buf();
 }
+
+std::vector<std::string> extra_extensions = {".sav", ".txt", ".rtf", ".htm", ".html"};
+
+std::vector<fs::path> extra_files(fs::path scen_file) {
+	std::vector<fs::path> files;
+
+	std::string scen_extension = scen_file.extension().string();
+	std::transform(scen_extension.begin(), scen_extension.end(), scen_extension.begin(), tolower);
+	if(scen_extension != ".exs") return files;
+
+	fs::path directory = scen_file.parent_path();
+
+	fs::recursive_directory_iterator file_iter(directory);
+	for(; file_iter != fs::recursive_directory_iterator(); file_iter++) {
+		fs::path file = *file_iter;
+		std::string extension = file.extension().string();
+		std::transform(extension.begin(), extension.end(), extension.begin(), tolower);
+		if(std::find(extra_extensions.begin(), extra_extensions.end(), extension) != extra_extensions.end()){
+			files.push_back(file);
+		}
+	}
+
+	return files;
+}

src/game/boe.fileio.hpp

@@ -37,4 +37,7 @@ void try_auto_save(std::string reason);
 // Turn lower-case and strip articles from the front of a scenario title, for alphabetization
 std::string name_alphabetical(std::string scenario_name);
 
+// Find extra files packaged with legacy scenarios (such as readme, prefab party):
+std::vector<fs::path> extra_files(fs::path scen_file);
+
 #endif