playtest mode

kiln-tui/src/editor.rs

@@ -15,6 +15,7 @@ use crate::render::{BoardWidget, board_to_screen, screen_to_board};
 use crate::ui::Ui;
 use crate::utils::rgba8_to_color;
 use kiln_core::cp437::tile_to_char;
+use kiln_core::game::GameState;
 use kiln_core::glyph::Glyph;
 use kiln_core::log::LogLine;
 use kiln_core::world::World;
@@ -89,6 +90,10 @@ pub(crate) struct EditorState {
     last_board_area: Rect,
     /// Editor-side log lines (the editor has no game log to draw from).
     log: Vec<LogLine>,
+    /// A playtest game built by [`playtest`](EditorState::playtest), waiting for the
+    /// run loop to swap into [`Mode::Play`](crate::mode::Mode::Play). `Some` for only
+    /// the single frame between the menu action and the swap.
+    pub(crate) pending_playtest: Option<GameState>,
 }
 
 impl EditorState {
@@ -111,6 +116,7 @@ impl EditorState {
             blink_timer: 0.0,
             last_board_area: Rect::default(),
             log: vec![LogLine::raw("editing — press [esc] for the menu")],
+            pending_playtest: None,
         }
     }
 
@@ -307,6 +313,24 @@ impl EditorState {
         let max = total_w.saturating_sub(MIN_PANEL_WIDTH).max(MIN_PANEL_WIDTH);
         self.sidebar_width = target.clamp(MIN_PANEL_WIDTH, max);
     }
+
+    /// Playtest the board currently being edited, using its in-memory state.
+    ///
+    /// Builds a [`GameState`] against a **deep copy** of the world ([`World::deep_clone`])
+    /// so nothing the playtest does (pushing crates, running scripts, …) touches the
+    /// boards being edited. The copy's start board is set to the edited board so play
+    /// begins here, not at the world's entry board. The game is parked in
+    /// [`pending_playtest`](EditorState::pending_playtest); the run loop swaps it into
+    /// [`Mode::Play`](crate::mode::Mode::Play) and stashes this editor for `Esc` to restore.
+    pub(crate) fn playtest(&mut self) {
+        let mut world = self.world.deep_clone();
+        // Start the playtest on the board open in the editor, not world.start.
+        world.start = self.board_name.clone();
+        let mut game = GameState::from_world(world);
+        game.log(LogLine::raw("[esc] to return to the editor"));
+        game.run_init();
+        self.pending_playtest = Some(game);
+    }
 }
 
 /// Handles an input event while a dialog is open ([`InputMode::Dialog`](crate::input::InputMode::Dialog)).