Run a line at a terminal's prompt through pty/run and read how it ended

/pane/<n>/pty/run takes factotum's rpc shape: write one line on an open,
read the answer on that same open. The answer is exit N once the command
ended and the shell is back at a prompt; busy at once when a command runs,
text is typed at the prompt, or the shell has not drawn its first prompt;
error not run when the shell refused the line without running it (fish on
a syntax error keeps it on the prompt, so it is taken back with Ctrl-U);
error shell gone when the pane closes or its shell is replaced; error no
prompt marks for a shell pardes could not instrument.

The end comes from the shell's OSC 133 marks. ghostty parses D's exit
status and drops it, so the stream now runs through a handler that wraps
ghostty's and follows prompt -> input -> running -> done. The marks pardes
injects into bash and fish carry aid=pardes and only those count, so fish
4's own marks (which doubled ours), a nested shell's, and a stray 133;D in
printed output are ignored.

Checked end to end against real bash and fish: false, exit 7, a syntax
error, sleep, busy while running, and the pane closing mid-command.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 06bc81ed..29a9ab3a 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -7024,6 +7024,10 @@ pub const Pardes = struct {
     }
 
     pub fn acknowledgeShell(p: *Pardes, id: usize, executable: []const u8, prompt_marks: bool) void {
+        if (id < MAX_PANES) {
+            ctlfs.pty.shellGone(p, id); // a respawn replaced whatever ran
+            p.fs.panes[id].unmarked = !prompt_marks;
+        }
         if (id < MAX_PANES) panes.Terminal.shellSpawned(p, id, prompt_marks);
         if (p.settings.shell.effective.set(executable))
             p.settings.shell.pending = false;
@@ -7848,6 +7852,7 @@ pub const Pardes = struct {
                 const pane = p.panes[o.pane] orelse return;
                 ctlfs.events.notePtyOutput(p, o.pane, o.bytes);
                 panes.Terminal.feedOutput(p, pane, o.bytes);
+                ctlfs.pty.noteMarks(p, o.pane, pane);
             },
             .eof => |e| p.removePane(e.pane, null) catch |err| {
                 if (p.panes[e.pane]) |pane| pane.mode = .normal;