A terminal's new directory is a rename in the log, and its ctl counts its body

The log said new N / and later del N <cwd> for a terminal, with no rename
in between, though a terminal is named by its directory. setCwd now logs
the rename once the pane has been announced. A terminal's ctl line gave
body length 0 while its body reads its history; it now counts that
history (without keeping a copy).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/Terminal.zig b/src/Terminal.zig
index 16d5af26..0bec3ce8 100644
--- a/src/Terminal.zig
+++ b/src/Terminal.zig
@@ -368,6 +368,22 @@ pub fn screenTextAlloc(pane: *Pane, gpa: std.mem.Allocator) ![]const u8 {
     return state.vt.screens.active.dumpStringAlloc(gpa, .{ .screen = .{} });
 }
 
+/// How long `screenTextAlloc` would be, counted without keeping it: the
+/// length a terminal's body reads as, which its ctl line reports.
+pub fn screenTextLen(pane: *Pane) usize {
+    if (comptime !enabled) return 0;
+    const state = pane.terminal orelse return 0;
+    const screen = state.vt.screens.active;
+    var buf: [256]u8 = undefined;
+    var counting: std.Io.Writer.Discarding = .init(&buf);
+    screen.dumpString(&counting.writer, .{
+        .tl = screen.pages.getTopLeft(.screen),
+        .br = screen.pages.getBottomRight(.screen) orelse return 0,
+        .unwrap = false,
+    }) catch return 0;
+    return @intCast(counting.fullCount());
+}
+
 /// Release the emulator's heap. The Pane allocation itself is the core's.
 pub fn deinitEmulator(pane: *Pane, gpa: std.mem.Allocator) void {
     if (comptime !enabled) return;