Attempt at moving away some of the launcher logic from the GUI

src/infos.rs

@@ -20,6 +20,60 @@ pub struct LauncherInfo {
     pub name: String,
 }
 
+pub struct LauncherManager {
+    pub launchers: Vec<LauncherInfo>,
+    pub current_selected: Option<usize>,
+}
+
+impl LauncherManager {
+    pub fn new() -> LauncherManager {
+        LauncherManager {
+            launchers: Vec::new(),
+            current_selected: None,
+        }
+    }
+    pub fn add(&mut self, launcher: LauncherInfo) {
+        self.launchers.push(launcher);
+    }
+    pub fn get(&self, index: usize) -> Option<(&LauncherInfo, bool)> {
+        if index > self.launchers.len() {
+            None
+        } else {
+            Some((self.launchers.get(index).unwrap(), index == self.current_selected.unwrap_or(std::usize::MAX)))
+        }
+    }
+    pub fn get_current(&self) -> Option<&LauncherInfo> {
+        match self.current_selected {
+            None => None,
+            Some(pos) => Some(self.launchers.get(pos).unwrap()),
+        }
+    }
+    pub fn set_current(&mut self, index: usize) {
+        assert!(index <= self.launchers.len());
+        self.current_selected = Some(index);
+    }
+    pub fn clear_current(&mut self) {
+        self.current_selected = None;
+    }
+    pub fn remove_launcher(&mut self, index: usize) {
+        assert!(index <= self.launchers.len());
+        self.launchers.remove(index);
+    }
+    pub fn iter_with_pos_and_selected(
+        &mut self,
+    ) -> impl Iterator<Item = (&mut LauncherInfo, usize, bool)> + '_ {
+        self.launchers
+            .iter_mut()
+            .enumerate()
+            .map(|(i, l)| (l, i, i == self.current_selected.unwrap_or(std::usize::MAX)))
+    }
+}
+
+pub struct IwadManager {
+    pub wads: Vec<WadInfo>,
+    pub current_selected: Option<usize>,
+}
+
 #[derive(PartialEq, Clone, Copy)]
 pub enum Difficulty {
     None,
@@ -64,5 +118,5 @@ impl Difficulty {
             Difficulty::Hard => "4",
             Difficulty::Nightmare => "5",
         }
-    }           
+    }
 }