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, 7 insertions, 7 deletions

diff --git a/src/host_io.zig b/src/host_io.zig
index f0a8d637..fcd2225b 100644
--- a/src/host_io.zig
+++ b/src/host_io.zig
@@ -588,9 +588,9 @@ pub const Shell = struct {
 
     const bash_rc =
         \\[ -f "$HOME/.bashrc" ] && source "$HOME/.bashrc"
-        \\PS1='\[\e]133;A;cl=line\a\]'"$PS1"'\[\e]133;B\a\]'
-        \\PROMPT_COMMAND='printf "\e]133;D;%s\a" "$?"'"${PROMPT_COMMAND:+;$PROMPT_COMMAND}"
-        \\trap 'printf "\e]133;C\a"' DEBUG
+        \\PS1='\[\e]133;A;cl=line;aid=pardes\a\]'"$PS1"'\[\e]133;B;aid=pardes\a\]'
+        \\PROMPT_COMMAND='printf "\e]133;D;%s;aid=pardes\a" "$?"'"${PROMPT_COMMAND:+;$PROMPT_COMMAND}"
+        \\trap 'printf "\e]133;C;aid=pardes\a"' DEBUG
         \\
     ;
 
@@ -598,15 +598,15 @@ pub const Shell = struct {
     const fish_rc =
         \\functions -c fish_prompt __pardes_user_prompt
         \\function fish_prompt
-        \\    printf '\e]133;A;cl=line\a'
+        \\    printf '\e]133;A;cl=line;aid=pardes\a'
         \\    __pardes_user_prompt
-        \\    printf '\e]133;B\a'
+        \\    printf '\e]133;B;aid=pardes\a'
         \\end
         \\function __pardes_preexec --on-event fish_preexec
-        \\    printf '\e]133;C\a'
+        \\    printf '\e]133;C;aid=pardes\a'
         \\end
         \\function __pardes_postexec --on-event fish_postexec
-        \\    printf '\e]133;D;%s\a' $status
+        \\    printf '\e]133;D;%s;aid=pardes\a' $status
         \\end
         \\
     ;