show solutions with no matching level under a 'missing levels' chapter

CHANGELOG.md

@@ -3,6 +3,7 @@ Game store page: https://crispypin.itch.io/marble-machinations
 
 ## [unreleased]
 ### added
+- create "missing levels" section allowing access to solutions to levels that are no longer available
 - click to collapse chapters in level list
 ### fixed
 - When two input bindings had the same trigger but one has a strict subset of the others modifiers, both would activate when the one with more modifiers was pressed. For example (Ctrl+S -> Save) would also trigger (S -> Wire Tool). Now, Shift+S will still trigger Wire Tool, unless Shift+S (or eg. Shift+Ctrl+S) is bound to something else.

README.md

@@ -21,7 +21,6 @@ logic mostly like https://git.crispypin.cc/CrispyPin/marble
 - UI layout engine
   - global scale setting
 #### unspecified
-- show orphaned solutions
 - comments
   - editing
   - add to all intro levels

src/level.rs

@@ -49,6 +49,20 @@ impl IOData {
 }
 
 impl Level {
+	pub fn new_orphan(id: &str) -> Self {
+		Self {
+			id: id.to_owned(),
+			name: id.to_owned(),
+			description: String::from(
+				"No level with this id was found, but there are saved solutions pointing to it.\n
+Because input values and expected output is not available, this functions as a sandbox.\n
+This allows you to recover any machines you have built here.",
+			),
+			init_board: None,
+			stages: Vec::new(),
+		}
+	}
+
 	pub fn id(&self) -> &str {
 		&self.id
 	}

src/main.rs

@@ -10,7 +10,7 @@ use marble_machinations::*;
 
 use config::Config;
 use editor::{Editor, ExitState};
-use level::Chapter;
+use level::{Chapter, Level};
 use solution::Solution;
 use theme::*;
 use ui::{simple_option_button, tex32_button, text_button, text_input, ShapedText, Tooltip};
@@ -46,8 +46,11 @@ fn main() {
 
 impl Game {
 	fn new(rl: &mut RaylibHandle, thread: &RaylibThread) -> Self {
-		let chapters = get_chapters();
+		let mut chapters = get_chapters();
 		let solutions = get_solutions();
+		if let Some(orphans) = find_orphans(&chapters, &solutions) {
+			chapters.push(orphans);
+		}
 
 		Self {
 			chapters,
@@ -407,9 +410,37 @@ fn get_solutions() -> HashMap<String, Vec<Solution>> {
 					}
 					solutions.sort_unstable_by_key(Solution::id);
 				}
-				by_level.insert(level_name, solutions);
+				if !solutions.is_empty() {
+					by_level.insert(level_name, solutions);
+				}
 			}
 		}
 	}
 	by_level
 }
+
+fn find_orphans(
+	chapters: &[Chapter],
+	solutions: &HashMap<String, Vec<Solution>>,
+) -> Option<Chapter> {
+	let mut orphan_levels = Vec::new();
+	'outer: for id in solutions.keys() {
+		for c in chapters {
+			for l in &c.levels {
+				if l.id() == id {
+					continue 'outer;
+				}
+			}
+		}
+		orphan_levels.push(Level::new_orphan(id))
+	}
+	if orphan_levels.is_empty() {
+		None
+	} else {
+		Some(Chapter {
+			title: "Missing levels".into(),
+			levels: orphan_levels,
+			visible: false,
+		})
+	}
+}