terminal: fullReset uses the new screen reset methods

src/terminal/Screen.zig

@@ -83,8 +83,8 @@ pub const Dirty = packed struct {
 /// The cursor position and style.
 pub const Cursor = struct {
     // The x/y position within the viewport.
-    x: size.CellCountInt,
-    y: size.CellCountInt,
+    x: size.CellCountInt = 0,
+    y: size.CellCountInt = 0,
 
     /// The visual style of the cursor. This defaults to block because
     /// it has to default to something, but users of this struct are
@@ -249,6 +249,50 @@ pub fn assertIntegrity(self: *const Screen) void {
     }
 }
 
+/// Reset the screen according to the logic of a DEC RIS sequence.
+///
+/// - Clears the screen and attempts to reclaim memory.
+/// - Moves the cursor to the top-left.
+/// - Clears any cursor state: style, hyperlink, etc.
+/// - Resets the charset
+/// - Clears the selection
+/// - Deletes all Kitty graphics
+/// - Resets Kitty Keyboard settings
+/// - Disables protection mode
+///
+pub fn reset(self: *Screen) void {
+    // Reset our pages
+    self.pages.reset();
+
+    // The above reset preserves tracked pins so we can still use
+    // our cursor pin, which should be at the top-left already.
+    const cursor_pin: *PageList.Pin = self.cursor.page_pin;
+    assert(cursor_pin.node == self.pages.pages.first.?);
+    assert(cursor_pin.x == 0);
+    assert(cursor_pin.y == 0);
+    const cursor_rac = cursor_pin.rowAndCell();
+    self.cursor.deinit(self.alloc);
+    self.cursor = .{
+        .page_pin = cursor_pin,
+        .page_row = cursor_rac.row,
+        .page_cell = cursor_rac.cell,
+    };
+
+    // Clear kitty graphics
+    self.kitty_images.delete(
+        self.alloc,
+        undefined, // All image deletion doesn't need the terminal
+        .{ .all = true },
+    );
+
+    // Reset our basic state
+    self.saved_cursor = null;
+    self.charset = .{};
+    self.kitty_keyboard = .{};
+    self.protected_mode = .off;
+    self.clearSelection();
+}
+
 /// Clone the screen.
 ///
 /// This will copy:

src/terminal/Terminal.zig

@@ -2627,82 +2627,38 @@ pub fn plainStringUnwrapped(self: *Terminal, alloc: Allocator) ![]const u8 {
 
 /// Full reset.
 ///
-/// This will attempt to free the existing screen memory and allocate
-/// new screens but if that fails this will reuse the existing memory
-/// from the prior screens. In the latter case, memory may be wasted
-/// (since its unused) but it isn't leaked.
+/// This will attempt to free the existing screen memory but if that fails
+/// this will reuse the existing memory. In the latter case, memory may
+/// be wasted (since its unused) but it isn't leaked.
 pub fn fullReset(self: *Terminal) void {
-    // Attempt to initialize new screens.
-    var new_primary = Screen.init(
-        self.screen.alloc,
-        self.cols,
-        self.rows,
-        self.screen.pages.explicit_max_size,
-    ) catch |err| {
-        log.warn("failed to allocate new primary screen, reusing old memory err={}", .{err});
-        self.fallbackReset();
-        return;
-    };
-    const new_secondary = Screen.init(
-        self.secondary_screen.alloc,
-        self.cols,
-        self.rows,
-        0,
-    ) catch |err| {
-        log.warn("failed to allocate new secondary screen, reusing old memory err={}", .{err});
-        new_primary.deinit();
-        self.fallbackReset();
-        return;
-    };
+    // Reset our screens
+    self.screen.reset();
+    self.secondary_screen.reset();
 
-    // If we got here, both new screens were successfully allocated
-    // and we can deinitialize the old screens.
-    self.screen.deinit();
-    self.secondary_screen.deinit();
-
-    // Replace with the newly allocated screens.
-    self.screen = new_primary;
-    self.secondary_screen = new_secondary;
-
-    self.resetCommonState();
+    // Ensure we're back on primary screen
+    if (self.active_screen != .primary) {
+        const old = self.screen;
+        self.screen = self.secondary_screen;
+        self.secondary_screen = old;
+        self.active_screen = .primary;
     }
 
-fn fallbackReset(self: *Terminal) void {
-    // Clear existing screens without reallocation
-    self.primaryScreen(.{ .clear_on_exit = true, .cursor_save = false });
-    self.screen.clearSelection();
-    self.eraseDisplay(.scrollback, false);
-    self.eraseDisplay(.complete, false);
-    self.screen.cursorAbsolute(0, 0);
-    self.resetCommonState();
-}
-
-fn resetCommonState(self: *Terminal) void {
-    // We set the saved cursor to null and then restore. This will force
-    // our cursor to go back to the default which will also move the cursor
-    // to the top-left.
-    self.screen.saved_cursor = null;
-    self.restoreCursor() catch |err| {
-        log.warn("restore cursor on primary screen failed err={}", .{err});
-    };
-
-    self.screen.endHyperlink();
-    self.screen.charset = .{};
+    // Rest our basic state
     self.modes.reset();
     self.flags = .{};
     self.tabstops.reset(TABSTOP_INTERVAL);
-    self.screen.kitty_keyboard = .{};
-    self.secondary_screen.kitty_keyboard = .{};
-    self.screen.protected_mode = .off;
+    self.previous_char = null;
+    self.pwd.clearRetainingCapacity();
+    self.status_display = .main;
     self.scrolling_region = .{
         .top = 0,
         .bottom = self.rows - 1,
         .left = 0,
         .right = self.cols - 1,
     };
-    self.previous_char = null;
-    self.pwd.clearRetainingCapacity();
-    self.status_display = .main;
+
+    // Always mark dirty so we redraw everything
+    self.flags.dirty.clear = true;
 }
 
 /// Returns true if the point is dirty, used for testing.