From 9070942b29bd10dddcdecdb0e88ba0fb40608467 Mon Sep 17 00:00:00 2001 From: Gabriel Schneider Date: Mon, 21 Sep 2026 20:07:43 -0300 Subject: Plan 9 idiom for the control filesystem, and the regressions a624a56 left The 9P tree stops being a command language wearing a filesystem. /new created a pane as a side effect of a *read*; it is now Tcreate in /pane, with Tremove to close, which cloud9's engine has always supported and the editor never declared: tree.zig now says `features = .{ .create = true, .remove = true }`. Eleven pane ctl verbs become files that can be read as well as written -- dot, limit, dirty, mark, scroll, look, exec -- leaving ctl with `get`, the one verb no file would say better. Root /ctl splits into a read-only /status and the /look and /exec files whose write IS the click. stat carries real sizes where it used to answer 0, and qid versions track a pane's revision, so a client can poll for change without re-reading the body. Commit a624a56 moved raw-tty keys to an early-return branch that knew only Ctrl-B and bare Escape, and in the same edit deleted the paste branch below it. That cost Shift-Escape (the unconditional way out of tty mode) and both paste chords: Ctrl-V and Ctrl-Shift-V reached the child as keystrokes, so an agent CLI running in a pane took Ctrl-V for its image-paste binding and answered "No image found in clipboard". Both are restored, with tests. Nested detection was not subtly broken but deleted: 60367d8 removed nested.zig's process-ancestry walk and left "am I inside pardes" derived from PARDES_FORWARD_LOOK, which read "0" both for --nested and for "the listener did not come up". PARDES_PID now answers that question on its own, checked with kill(pid, 0); PARDES_9P and PARDES_PANE answer how to reach it; the flag is gone. The posted-9P registry also self-heals now -- a session that aborts cannot unlink its own socket, so posting sweeps entries whose target refuses a connection, symlinks only and on a definite ECONNREFUSED only. Elsewhere: tty scrolling is sticky-bottom, following new output only from the last row, with typing and entering raw mode snapping back to live; the boot layouts are a Boot enum instead of a chain of ifs, and the bare tty startup (Boot.tty, which main.zig names) opens an empty text pane under the shell while tests keep Boot.tty_shell; builtins announce themselves on the message row under a Verbose setting that is on by default; Config prints each setting the way you would type it back, so WindowOpacity 70 rather than "WindowOpacity: 70%"; LocationsConfig opens its window only when called bare; every tagline puts the word that closes the thing last, and a column now outlives its panes -- closing the last one leaves an empty pane, and only Delcol, newly on the column tagline, takes the column away. Co-Authored-By: Claude Opus 5 (1M context) --- src/ninep/pty.zig | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'src/ninep/pty.zig') diff --git a/src/ninep/pty.zig b/src/ninep/pty.zig index e6696b85..1b71a8d3 100644 --- a/src/ninep/pty.zig +++ b/src/ninep/pty.zig @@ -76,6 +76,9 @@ fn verb(p: *Pardes, id: usize, line: []const u8, apply: bool) bool { return true; } +/// Three right-aligned fields: cols, rows and whether the host holds the tty. +pub const status_len: u64 = 36; + pub fn readStatus(p: *Pardes, req: Req, id: usize, pane: *Pane) Reply { const out = p.fs.stage(p.gpa); out.print(p.gpa, "{d:>11} {d:>11} {d:>11} ", .{ @@ -146,7 +149,7 @@ test "a pane that is not a terminal has no pty/ at all" { var buf: [32]th.Dirent = undefined; const files = th.dirents(rdir(p, dir, 0).bytes, &buf); - try testing.expectEqual(@as(usize, 10), files.len); + try testing.expectEqual(@as(usize, 17), files.len); try testing.expect(th.nameAt(files, "pty") == null); try testing.expectEqual(E.NOENT, look_up(p, dir, "pty_ctl").errno()); @@ -167,7 +170,7 @@ test "a terminal pane's pty/ holds exactly ctl, status and data" { var buf: [32]th.Dirent = undefined; const files = th.dirents(rdir(p, dir, 0).bytes, &buf); - try testing.expectEqual(@as(usize, 11), files.len); + try testing.expectEqual(@as(usize, 18), files.len); try testing.expect(th.nameAt(files, "pty").?.dir); const inside = th.dirents(rdir(p, Node.of(serial, .pty), 0).bytes, &buf); @@ -247,7 +250,7 @@ test "every pty/ctl verb, and every refusal" { "cooked", "winsize 80 24\nbogus", // a good verb beside a bad one "bogus\nwinsize 80 24", - "look x", // a `ctl` verb; the two files share no vocabulary + "look x", // a pane command; pty/ctl shares none of that vocabulary "exec Del", }) |bad| { const a = wr(p, ctl, bad); -- cgit v1.3