T38: inside herdr, which passes no OSC 7501 on, herdr's agents in a state it knows are the session's records, one a pane, their app, title and message from herdr's fields; a snapshot that lists other agents replaces them whole, and they go when herdr leaves the foreground

AGENTS.md

@@ -34,7 +34,7 @@ ELYTerminal. A terminal on GPUI and Ely components. `PRD.md` says what it does;
 - `src/main.rs`: start. `src/lib.rs`: the modules, public so tests and examples reach them. `src/app.rs`: fonts, settings, integration, then the main window, at the size the settings keep, which it keeps as it settles. `src/menus.rs`: the menu bar, the keys of Quit, the font's size and Minimize, and what they do. `src/blur.rs`: what the window shows of the desktop, from the opacity and blur settings, set as they change; `blur/macos` gives gpui's NSVisualEffectView a material that blurs; `blur/wayland` asks a Wayland compositor for blur behind the window's surface through `ext_background_effect_v1`; `blur/x11` names the window's pane in `_KDE_NET_WM_BLUR_BEHIND_REGION`. `src/workspace.rs`: the window's content, Ely's `ColumnShell` with the sessions, terminal and right columns, their toggles, the right column's Git and Files switch, the title, and the sessions' lifecycle. `src/workspace/widths.rs`: the side columns' widths, which a drag on their border sets and the settings keep once it rests. `src/workspace/events.rs`: what a session's terminal reports: title, folder, bell, a command's end, the program's exit. `src/sessions.rs`: a session and its row. `src/files.rs`: the Files panel, the shown session's folder as Ely's `Tree` with Git's marks. `src/git.rs`: git through its command line: Files' marks, and the Git panel's status, stage, unstage, discard, commit and log; `src/git/diff.rs` reads git's diff into Ely's stretches. `src/git/panel.rs`: the Git panel's state and actions; `src/git/panel/view.rs`: how it draws.
 - `src/settings`: the model, its ranges, and `SettingsStore`, the global that loads, checks and saves `settings.json`; `window` is the settings window, `window/appearance` its Appearance page, `window/terminal` its Terminal page. `tests/fonts.rs` brings its own main: gpui builds its Mac platform only on the main thread.
 - `src/themes`: built-in terminal themes, the chrome palette each maps to, and `apply`, which dresses the app for the system's appearance; `omarchy`, on Linux, wears Omarchy 4's current theme and follows its switches.
-- `src/term`: the terminal engine. `pty` starts a program through alacritty's event loop; `tap` wraps the pty so its reader scans OSC 7, 9, 99, 133, 777 and 7501, full resets and the mouse modes before the parser; `marks` reads OSC 133's prompt marks; `status` reads OSC 7501 and keeps a terminal's records; `notify` reads OSC 9, 777 and 99, the notifications and OSC 9;4's progress, and gathers OSC 99's chunks; `prompts` turns each mark into an OSC 8 link the parser keeps in a prompt's cells, and finds the prompt to jump to; `herdr` follows herdr's focused pane through herdr's socket while herdr's client runs in the session: `herdr/unix` finds the client leading the pty's foreground, `herdr/windows` under the session's shell, and asks its named pipe. `unix` starts the program itself, so a failed `chdir` fails the start; Windows uses alacritty's ConPTY. `shell` writes the integration scripts at start and builds each shell's launch. `frame` reads the grid into styled rows, `boxes` turns box drawing, block elements and powerline arrows into rects and polygons (`boxes/outline` strokes curves and diagonals into polygons), `ink` resolves colors, `paint` draws rows, decorations and the cursor, `view` is the entity: pty events, metrics, blink, resize. `zoom` holds the points Bigger and Smaller add to the Size setting, unsaved. `keys` turns key events into bytes, the kitty protocol and, in `keys/legacy`, xterm's encoding, with no gpui types; `input` is the view's key listeners, the bindings that keep Tab and F6 from Ely's focus moves, and its IME handler; `mac` reads the Option side and repeat flag of AppKit's current event, keeps held keys repeating, and hands Command key-ups to the focused view. `mouse` encodes mouse reports, with no gpui types; `links` finds the link at a cell; `pointer` is the view's mouse listeners: selection, reports, wheel, links, copy and paste. `find` is the find box: Ely's `FindWidget`, and Ely's `find_all` over the grid's shown text.
+- `src/term`: the terminal engine. `pty` starts a program through alacritty's event loop; `tap` wraps the pty so its reader scans OSC 7, 9, 99, 133, 777 and 7501, full resets and the mouse modes before the parser; `marks` reads OSC 133's prompt marks; `status` reads OSC 7501 and keeps a terminal's records; `notify` reads OSC 9, 777 and 99, the notifications and OSC 9;4's progress, and gathers OSC 99's chunks; `prompts` turns each mark into an OSC 8 link the parser keeps in a prompt's cells, and finds the prompt to jump to; `herdr` follows herdr's focused pane and its agents' states through herdr's socket while herdr's client runs in the session: `herdr/unix` finds the client leading the pty's foreground, `herdr/windows` under the session's shell, and asks its named pipe. `unix` starts the program itself, so a failed `chdir` fails the start; Windows uses alacritty's ConPTY. `shell` writes the integration scripts at start and builds each shell's launch. `frame` reads the grid into styled rows, `boxes` turns box drawing, block elements and powerline arrows into rects and polygons (`boxes/outline` strokes curves and diagonals into polygons), `ink` resolves colors, `paint` draws rows, decorations and the cursor, `view` is the entity: pty events, metrics, blink, resize. `zoom` holds the points Bigger and Smaller add to the Size setting, unsaved. `keys` turns key events into bytes, the kitty protocol and, in `keys/legacy`, xterm's encoding, with no gpui types; `input` is the view's key listeners, the bindings that keep Tab and F6 from Ely's focus moves, and its IME handler; `mac` reads the Option side and repeat flag of AppKit's current event, keeps held keys repeating, and hands Command key-ups to the focused view. `mouse` encodes mouse reports, with no gpui types; `links` finds the link at a cell; `pointer` is the view's mouse listeners: selection, reports, wheel, links, copy and paste. `find` is the find box: Ely's `FindWidget`, and Ely's `find_all` over the grid's shown text.
 - `assets/shell-integration`: ELYTerminal's own scripts (not Ghostty's, which are GPL): zsh through `ZDOTDIR`, bash through `--rcfile`, fish through `XDG_DATA_DIRS`, PowerShell through `-NoExit -Command`. Each prompt sends OSC 7 and, except in fish, whose `fish_title` stays, a title; each marks prompts and commands with OSC 133 where the shell does not.
 - `assets/fonts`: JetBrains Mono 2.304's bold and italic faces (OFL; Ely bundles regular), and Nerd Fonts 3.5.1's JetBrains Mono NF Mono Regular, which draws icons a font lacks.
 - `assets/themes`: Ghostty theme files copied verbatim from iTerm2-Color-Schemes (MIT, its `LICENSE` beside them).
@@ -100,3 +100,4 @@ ELYTerminal. A terminal on GPUI and Ely components. `PRD.md` says what it does;
 - 2026-10-16: the view jumps between prompts, which the owner asked for, as Ghostty jumps: Cmd-Up and Cmd-Down, with Shift or without, on macOS, Ctrl-Shift-Up and Ctrl-Shift-Down elsewhere, scroll to the prompt that starts before or after the view's top; a prompt on the screen's last page means the bottom, which the view cannot pass, and with none there nothing moves. alacritty's rows hold no marks, and the tap, which reads before the parser, never sees the cursor, so the tap rewrites what goes to the parser: an OSC that may be a mark is held whole until it ends and read as `marks` reads it, and a prompt's start becomes an OSC 8 link of the terminal's own, its target `\x7f`, which no program names, its id `\x7f` and the prompt's number; the prompt's end closes it. The parser stamps each cell the prompt prints with the link, SGR 0 keeps it, and it rides the cells through scroll, reflow and history; a prompt starts on the first row that shows its number, blank rows within it passed. A program's own link keeps its target and takes the prompt's number in its id: one opened inside a prompt carries it, and a prompt that starts inside one opens it again with the number and gives back its own id at the prompt's end, its target kept whole as the scanner keeps it; its end inside a prompt takes the prompt's link up again. A cursor restore that brings back a link passes the rewrite by. An OSC held, a body of 4096 bytes at most as the scanner keeps it and twice that with the controls vte skips, shows nothing until it ends; controls vte runs inside an escape go on before an ESC that waits, and only an ESC from ground waits: one that ends an OSC goes on with it, so what follows runs where the parser stands. A rewrite turns a mark of 8 bytes inside a program's link into that link again, its target up to 4096 bytes, so the tap reads about 2 KB of the buffer's room at a time, which moved 3 MB through a pty as fast as larger reads. Links, Cmd-press among them, pass over the prompt's link. The tap's OSC scanner ends a body as vte does, at BEL, ESC, CAN or SUB, and skips the controls vte skips, so a mark and its link agree.
 - 2026-10-17: programs say what they are doing through OSC 7501, revision 0.4 of the Program Status Protocol, which the owner asked for, read as the spec reads it: pairs `key=value` joined by `:`, a malformed pair skipped, an unknown key passed by, and every pair of a known key checked, a clear's too, before the last of each key is kept. A sequence over 4096 bytes, counted from OSC through ST with the controls its body skips, a key over 16, an app over 32, an id outside its grammar or limits (128 bytes, 32 a segment, 8 levels), a title or msg over its limits, not base64, not UTF-8 or holding a control character, and a missing or unknown state each drop it whole; kind counts only with blocked, and progress, 0 to 100, only with working and blocked, each absent when unknown. Each terminal keeps its records by id, the root's empty: a report replaces its record whole, clear drops the record and those under it, or all without an id, and past 256 the record updated longest ago goes. A new prompt drops working, blocked and idle records, as kitty does, and keeps done and error; a full reset, which the tap's scanner sees as `ESC c`, through the controls, DEL and high bytes vte passes by in an escape, drops all, and DECSTR nothing. The query `OSC 7501 ; ?` is answered with every state and kind; the view writes the answer when the session hears the query, ahead of the parser's answers to what came later in the same read, so a DA1 sent after the query, as the spec suggests, comes back second, and one sent before it in the same read comes back after it.
 - 2026-10-17: programs ask for notifications through OSC 9, 777 and 99 and report progress through OSC 9;4, which the owner asked for. OSC 9 is ConEmu's command where Ghostty reads one, 9;1 to 9;12 each by its own shape, else iTerm2's notification, its text the title; OSC 777 is rxvt's `notify;title;body`, another extension logged and passed by. OSC 99 is kitty's: `k=v` pairs before the payload, a malformed pair passed by; `i`, of `[A-Za-z0-9_-+.]` alone or the sequence drops, gathers chunks while `d=0`, 32 notifications and 16384 bytes of text at most; a payload holds 2048 bytes plain or 4096 encoded at most; plain text is UTF-8 without a control character; `e=1` reads it as base64 group by group, so chunks split before encoding or after join, and it carries any UTF-8, newlines too, checked once the text is whole; a chunk that breaks a rule drops what its notification gathered; metadata holds 1024 bytes at most, and the tap keeps an OSC 99 body to 5124 bytes, room for metadata and a full payload, where other bodies stop at 4096; `p` takes title, body, close, ? and alive, and other payloads pass by; `o`, `a`, `c` and `w` are kept for showing; a lone body is the title, and one with neither passes by. The query is answered with what is read so far, `p=title,body,?,alive:o=always`, and alive with no id, since none shows yet; an answer names the asker's id, or 0. OSC 9;4's states, remove, set, error, indeterminate and pause, read as Ghostty reads them, the progress clamped to 100, stand as the root record: set and pause working with their progress, indeterminate working without, error an error, remove none; this lasts until a program reports through OSC 7501, and again after a full reset, as the spec asks, so a mapped 9;4 never wipes a real report. Notifications go to the workspace, which logs them.
+- 2026-10-17: inside herdr, which passes no OSC 7501 on, herdr's agents are the session's records. The snapshot the follower asks for lists them; one in a state herdr knows, idle, working, blocked or done, is the record `herdr/PANE`, and unknown and any state herdr adds later pass by. herdr names no kind and no progress; the app is the agent, the title its name, else the name herdr shows for it, and the message its terminal title less the spinner herdr strips, else the title its metadata sets; herdr's done is idle and not yet seen. A snapshot that lists other agents replaces them whole, so a full reset or a clear that dropped them sees them back at the next; they go when herdr leaves the foreground, and a snapshot that lands after the shell reported a folder is dropped, its agents with it. A change of their states is logged; a herdr whose snapshot lacks `agents` lists none.