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feat: input parser probe-response recognition → CapabilityEvent - #132

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@natemoo-re natemoo-re commented Sep 19, 2026 •

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Part 3/4 of the terminfo foundation stack. Requires #131.

  • src/input.{c,h}: the input parser seeds its escape-sequence trie from the terminfo keys table and recognizes probe responses (OSC 10/11/12/21/22, XTGETTCAP, DECRPM 2026, kitty keyboard/graphics APC, DA1 fence)
  • input.ts: scan() surfaces those responses as CapabilityEvent values alongside key and mouse events, ready to hand to term.update()
  • Breaking: createInput({ terminfo }) keeps its name but now takes the TerminalInfo from detectTerminal() instead of raw bytes
  • Detection is renamed TerminalInfo; raw terminfo bytes move to detectTerminal({ entry }) so terminfo means one thing everywhere (MAX_TERMINFO → MAX_TERMINFO_ENTRY); none of these have shipped yet
  • Specs updated to match; tests cover response recognition per input-spec §6

@natemoo-re
natemoo-re added this pull request to stack #134 September 19, 2026 04:29
@bombshell-cooper

bombshell-cooper Bot commented Sep 19, 2026 •

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Changeset suggestion

The current changeset no longer matches this PR. This review contains a corrected replacement.

Why: Changeset package scope does not match the affected packages confidently. Changeset bump does not match the consumer-visible impact.

View the proposed changeset
---
'@bomb.sh/tty': minor
---

Adds `CapabilityEvent` to `InputEvent` and changes `InputOptions.terminfo` to accept a `TerminalInfo`.

`scan()` now parses terminal probe responses — OSC 10/11/12 theme colors, OSC 21 kitty color protocol, OSC 22 pointer shape, XTGETTCAP (`DCS`), kitty graphics (`APC`), kitty keyboard (`CSI ?…u`), synchronized output (`DECRPM`), and DA1 — and surfaces them as typed `CapabilityEvent` objects with keys `foreground-color`, `background-color`, `cursor-color`, `colordepth`, `sync-output`, `kitty-keyboard`, `kitty-graphics`, and `pointer-shape`.

`InputOptions.terminfo` now takes the `TerminalInfo` returned by `detectTerminal()` instead of raw compiled terminfo bytes. It seeds the key-sequence trie from `terminfo.keys` and uses `terminfo.capabilities.colors` to resolve colordepth denial events to the correct tier (`"16"` vs `"256"`). Raw bytes now go to `detectTerminal({ entry })`.

#### Migration

```diff
- import { createInput } from "@bomb.sh/tty";
+ import { createInput, detectTerminal } from "@bomb.sh/tty";

- const input = await createInput({ terminfo: myTerminfoBinary });
+ const terminfo = await detectTerminal({ env: process.env, entry: myTerminfoBinary });
+ const input = await createInput({ terminfo });
```

Omit `terminfo` entirely to keep the xterm default key sequences.

Review this changeset manually

If this draft is correct, react with 🚀 and Cooper will commit it to this branch.

Draft updated. Remove and re-add your 🚀 reaction to approve this version.

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npm i https://pkg.pr.new/@bomb.sh/tty@132

commit: 291910b

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Size Increased — +7.7 KB

120.2 KB unpacked

@natemoo-re natemoo-re changed the title feat/input probe events feat: input parser probe-response recognition → CapabilityEvent Sep 19, 2026
@codspeed

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Merging this PR will degrade performance by 25.64%

❌ 1 (👁 1) regressed benchmark
✅ 9 untouched benchmarks

Performance Changes

Benchmark BASE HEAD Efficiency
👁 createInput 268.6 ms 361.2 ms -25.64%

Comparing feat/input-probe-events (291910b) with main (666546e)

Open in CodSpeed

@natemoo-re
natemoo-re force-pushed the feat/input-probe-events branch from ff3f7c4 to 299df82 Compare September 30, 2026 01:50
@natemoo-re
natemoo-re force-pushed the feat/input-probe-events branch 3 times, most recently from 4b430b6 to fb273f9 Compare September 30, 2026 15:11
@natemoo-re
natemoo-re marked this pull request as ready for review September 30, 2026 15:12
@natemoo-re
natemoo-re force-pushed the feat/input-probe-events branch from fb273f9 to a2a08b1 Compare October 6, 2026 00:34
Base automatically changed from feat/terminfo-core to main October 6, 2026 01:04
@natemoo-re
natemoo-re force-pushed the feat/input-probe-events branch from a2a08b1 to aeb96df Compare October 6, 2026 01:04
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I consider the performance regression here acceptable for the capability we're gaining, but we may want to do a dedicated performance optimization pass once we're comfortable with the feature set.

@@ -0,0 +1,22 @@
---

@bombshell-cooper bombshell-cooper Bot Oct 6, 2026 •

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Changeset needs revision.

Changeset package scope does not match the affected packages confidently. Changeset bump does not match the consumer-visible impact.

View the proposed replacement
---
'@bomb.sh/tty': minor
---

Adds `CapabilityEvent` to `InputEvent` and changes `InputOptions.terminfo` to accept a `TerminalInfo`.

`scan()` now parses terminal probe responses — OSC 10/11/12 theme colors, OSC 21 kitty color protocol, OSC 22 pointer shape, XTGETTCAP (`DCS`), kitty graphics (`APC`), kitty keyboard (`CSI ?…u`), synchronized output (`DECRPM`), and DA1 — and surfaces them as typed `CapabilityEvent` objects with keys `foreground-color`, `background-color`, `cursor-color`, `colordepth`, `sync-output`, `kitty-keyboard`, `kitty-graphics`, and `pointer-shape`.

`InputOptions.terminfo` now takes the `TerminalInfo` returned by `detectTerminal()` instead of raw compiled terminfo bytes. It seeds the key-sequence trie from `terminfo.keys` and uses `terminfo.capabilities.colors` to resolve colordepth denial events to the correct tier (`"16"` vs `"256"`). Raw bytes now go to `detectTerminal({ entry })`.

#### Migration

```diff
- import { createInput } from "@bomb.sh/tty";
+ import { createInput, detectTerminal } from "@bomb.sh/tty";

- const input = await createInput({ terminfo: myTerminfoBinary });
+ const terminfo = await detectTerminal({ env: process.env, entry: myTerminfoBinary });
+ const input = await createInput({ terminfo });
```

Omit `terminfo` entirely to keep the xterm default key sequences.

Comment thread .changeset/cooper-approved-132.md
natemoo-re added a commit that referenced this pull request Oct 6, 2026
Match createInput: the renderer option is `terminfo`, typed
`TerminalInfo`. Adds the first test that seeds createTerm from a detected
TerminalInfo (previously untested; test/caps.ts helpers were unused).

The stack changeset now covers only what this PR and #131 add —
detectTerminal/TerminalInfo, createTerm's option, term.capabilities, and
the update() signature change — since #132 carries its own changeset for
the input side.
natemoo-re added a commit that referenced this pull request Oct 6, 2026
Match createInput: the renderer option is `terminfo`, typed
`TerminalInfo`. Adds the first test that seeds createTerm from a detected
TerminalInfo (previously untested; test/caps.ts helpers were unused).

The stack changeset now covers only what this PR and #131 add —
detectTerminal/TerminalInfo, createTerm's option, term.capabilities, and
the update() signature change — since #132 carries its own changeset for
the input side.
natemoo-re added a commit that referenced this pull request Oct 8, 2026
Match createInput: the renderer option is `terminfo`, typed
`TerminalInfo`. Adds the first test that seeds createTerm from a detected
TerminalInfo (previously untested; test/caps.ts helpers were unused).

The stack changeset now covers only what this PR and #131 add —
detectTerminal/TerminalInfo, createTerm's option, term.capabilities, and
the update() signature change — since #132 carries its own changeset for
the input side.
@natemoo-re
natemoo-re force-pushed the feat/input-probe-events branch from 0d1f019 to 660a987 Compare October 8, 2026 13:59

@cowboyd cowboyd left a comment •

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In addition to the memory question, I asked a robot to ponder the edge cases, and this is what it had to say:

The tests mostly cover valid, complete replies. They don’t sufficiently verify how the parser recovers from incomplete or invalid input, combines conflicting replies, or handles exhausted capacity. Those gaps can leave input stuck or produce incorrect events.

These are the tests I’d add, tied to what I observed:

Test cases Example and what it would catch
resolves ambiguous response prefixes after a timeout Reproduced: feeding ESC P—also the encoding of Alt+P—produced no event and no pending delay. The parser waits for a DCS response without scheduling recovery. Include ESC ] and ESC _ as related cases.
recovers when an incomplete response fills the input buffer Reproduced: ESC[? followed by 4,093 semicolons filled the 4,096-byte buffer. Feeding "a" afterward accepted zero bytes and produced zero events or pending delay.
preserves truecolor when RGB succeeds and Tc fails, in either order Reproduced: ESC P1+r524742 ST followed by ESC P0+r5463 ST emitted "truecolor" followed by "256". One unsupported capability incorrectly undoes the positive evidence from the other. Test replies both together and across separate scans.
emits the static color tier only when both RGB and Tc are denied Inspection: the denial branch immediately downgrades on any invalid XTGETTCAP reply. It doesn’t track whether both requested capabilities failed. Test both "16" and "256" baselines.
rejects malformed payloads and preserves the following key Inspection: color parsing accepts a valid prefix without requiring the entire payload to be valid. For example, #fffjunk reaches the success path. Follow malformed replies with "a" and verify that no capability event is fabricated and the key survives recovery.
recovers from oversized OSC, DCS, APC, and private CSI responses / handles numeric overflow Inspection: OSC/DCS/APC have a length check, but private CSI does not. Its decimal accumulator also multiplies an int without overflow checks. Exercise length boundaries and long digit strings, then verify subsequent input still works.
preserves default key bindings or reports trie exhaustion explicitly Inspection: trie_add() returns -1 when its 1,024 nodes are exhausted, but initialization ignores that result. Custom sequences are inserted first, so they can leave no room for defaults. I did not reproduce exhaustion.
does not fabricate events for unknown capability codes Inspection: mapCapEvent() defaults to { type: "capability", key: "pointer-shape", value: false }. An unknown code therefore becomes a plausible but unrelated event.
recognizes every supported response split at every byte boundary Coverage gap: the new suite tests one split inside an OSC color payload. It should also split immediately after ESC, inside response prefixes, and between the two ST terminator bytes, while checking for duplicate events and leaked bytes. No failure demonstrated for this case.

The timeout recovery policy and trie-exhaustion behavior should be explicit in the spec before their tests prescribe a particular outcome.

Comment thread input-native.ts Outdated
Comment on lines +231 to +240
if (keys && keys.byteLength > 0) {
top = (top + 7) & ~7;
keysPtr = top;
keysLen = keys.byteLength;
top += (keysLen + 7) & ~7;
let pages = Math.ceil(top / 65536);
let current = memory.buffer.byteLength / 65536;
if (pages > current) memory.grow(pages - current);
new Uint8Array(memory.buffer).set(keys, keysPtr);
}

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When we (potentially) grow the memory, we should also make sure that we include the size of the parser state and the transfer buffer to make sure we have room for both. Do we? I can't tell, but it looks like perhaps not?

Perhaps a comment on how we layout the WASM memory would help keep everything in sync, because I'm definitely not sure where each region begins and ends, which we'd need to make sure we always have enough.

@natemoo-re natemoo-re Oct 9, 2026 •

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you were right, it didn't! growth only covered the key table, so an adversarial terminfo could blow right past the end of memory. 4fed036 sizes the whole layout up front and grows once, and 9f88c97 adds the layout comment you asked for

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@cowboyd thanks for the robo-review! all valid 😅 addressed in 4fed036...9f88c97 with regression tests

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🎉 🎉 🎉

natemoo-re and others added 20 commits October 9, 2026 10:17
Revert the `terminfo` -> `detection` option rename. The option keeps its
name and changes format instead: it takes the `Detection` returned by
`detectTerminal()` rather than raw compiled terminfo bytes, which now go to
`detectTerminal({ terminfo })`. Specs updated for both `createInput` and
`createTerm` so the stack converges on one option name.

Changeset rewritten as a breaking-change note and fixed to target
`@bomb.sh/tty` (it referenced a nonexistent `@bombshell/input`).
`terminfo` now means one thing across the public API: the resolved
`TerminalInfo` passed to `createInput`/`createTerm`. The raw compiled
bytes move from `DetectOptions.terminfo` to `DetectOptions.entry` (ncurses'
term for one compiled description), and `MAX_TERMINFO` becomes
`MAX_TERMINFO_ENTRY` to match. `Detection` named how the value was made
rather than what it holds. None of these have shipped yet.
The spec said detectTerminal() never rejects, but an `entry` over
MAX_TERMINFO_ENTRY has always thrown a RangeError (and is tested). Keep
that behavior and say why: it is caller error. Environmental conditions —
missing, malformed, or oversized files on the search path — still resolve
to the baseline. Adds the missing test for skipping an oversized file found
on the search path.
createInputNative lays out linear memory as four consecutive 8-byte
aligned regions above __heap_base: the terminfo key table, the
InputState (input_size()), then the SCAN_BUFFER_SIZE transfer buffer.
Growth was only computed up to the end of the key table, so the state
and the transfer buffer could land past the end of memory. Today's
numbers hide it (heap base ~72 KB + 32 KB max entry + 23 KB state +
4 KB buffer fits in the initial 4 pages), but TerminalInfo is a plain
interface and a key table above ~180 KB trapped with "memory access
out of bounds" inside input_init.

Compute every region first, then grow once to cover the end of the
transfer buffer. The code now reads top-down as the memory map.
parse_csi_private had no length limit: `ESC [ ?` followed by enough
parameter bytes to fill the 4096-byte scan buffer kept returning
PARSE_NEED_MORE, input_scan accepted zero bytes from then on, and the
parser was wedged permanently. Before this branch the same bytes fell
through to the Alt+[ fallback, so this was a regression. Apply the
MAX_RESPONSE limit the OSC/DCS/APC paths already use; past it the
sequence is rejected and falls back like any unrecognized ESC sequence.

The decimal accumulator also multiplied a signed int without bounds,
which is UB in C and wraps in wasm: `ESC [ ? 4294969322 ; 1 $ y`
(2026 + 2^32) surfaced as a sync-output=true event. Parameters now
saturate above MAX_CSI_PARAM, which no recognized mode reaches.
…denied

terminfo-spec §6.3 says the static-tier denial is emitted when
XTGETTCAP rejects both RGB and Tc, but every `DCS 0 + r` reply
downgraded immediately. A terminal answering RGB=ok, Tc=invalid
produced "truecolor" followed by "256", throwing away the positive
evidence; the reverse order produced "256" then "truecolor".

The parser now tallies the two replies in InputState. A valid reply
for either name still emits "truecolor" and suppresses any later
denial. A denial only emits the static tier once both names are
denied. A `DCS 0 + r ST` that names neither capability (terminals
that stop at the first unknown name) counts as denying both, which
keeps the existing single-reply behaviour. The tally resets on the
DA1 fence so a re-sent probe is evaluated from scratch.

This is parser-private bookkeeping, not shared state, so TINV-6 holds.
parse_color_spec accepted any valid prefix: `#fffjunk` and
`rgb:ff/ff/ffzz` both produced a white color event, and the `rgba:`
form ignored whatever followed the blue channel. A malformed reply
should be consumed without fabricating a CapabilityEvent.

Both forms must now consume the whole payload. `rgba:` must carry a
well-formed 1-4 digit alpha channel, which is still discarded. The
surrounding OSC is still consumed through its terminator, so the key
that follows a malformed reply is unaffected.
mapCapEvent's default branch turned any CAP_* code it did not know into
`{ key: "pointer-shape", value: false }`, a plausible but unrelated
event that would silently overwrite real pointer-shape state in
term.update(). Unknown codes can only appear if src/input.h and
input-native.ts drift apart, and dropping the event is the honest
outcome in that case.

No test: the C side only emits the eight known codes, and reaching the
default branch would mean exporting mapEvent through mod.ts's
`export * from "./input.ts"`, which would widen the public API.
The suite only split one OSC color payload. Feed each response from
terminfo-spec §9.1, wrapped in an `x … y` key pair, split into two
scans at every byte offset and also one byte per scan. That covers
splits right after ESC, inside the OSC/DCS/APC/CSI introducers, inside
payloads, and between the two bytes of an ST terminator, and asserts
the exact event list so duplicated events or leaked response bytes
fail. escLatency is set high so a split after a lone ESC never times
out on a slow runner.

No behaviour change; this passed before and after the recent parser
fixes.
OSC/DCS/APC responses longer than MAX_RESPONSE are rejected and fall
back to the unrecognized-ESC path. Pin the parts of that recovery that
matter: no CapabilityEvent is fabricated from the oversized payload,
and a key typed afterwards still comes through. The test does not pin
how the rejected bytes themselves surface, which is a separate policy
question.
… length cap

Three parser behaviours that review showed were unspecified:

- §4.3: ESC followed only by `[`, `O`, `]`, `P`, or `_` is pending
  like a lone ESC and resolves to the Alt-modified key after
  escLatency. Without this, Alt+P/]/_ (regressed by response
  recognition) and Alt+[/O (already broken on main) sat in the buffer
  until the next byte arrived.
- §6.3: once an OSC/DCS/APC response header is recognized, BEL and ST
  terminate it, while any other C0 control, DEL, or an ESC not
  followed by `\` ends it early. The partial response is discarded and
  parsing resumes at the ending byte, so a reply cut off mid-payload
  cannot swallow the user's Enter or the next key sequence. The set
  is every byte a well-formed reply payload never contains; DEL is
  included because it is what Backspace sends.
- §6.1: terminfo key sequences longer than 16 bytes are ignored. The
  default xterm tables use 307 of the trie's 1024 nodes, so capping
  the 23 terminfo keys at 16 bytes (368 nodes worst case) makes trie
  exhaustion impossible rather than something to report.
Implements input-spec §4.3. `ESC [`, `ESC O`, `ESC ]`, `ESC P` and
`ESC _` are each a complete Alt+key press and also a prefix of a
longer sequence. The trie, CSI and response parsers all answered
PARSE_NEED_MORE for them without arming the ESC timer, so input_delay
reported nothing and the bytes sat in the buffer until something else
was typed. Alt+[ and Alt+O behaved that way on main; Alt+], Alt+P and
Alt+_ started doing it when response recognition claimed their
introducers.

The two-byte case now goes through the same timer as a lone ESC: it
reports `pending`, and a rescan after escLatency emits the introducer
with MOD_ALT. When the ESC arrived alone in an earlier scan, the timer
keeps running from that arrival.
Implements input-spec §6.3. After an OSC/DCS/APC response header was
recognized, find_st scanned for BEL or ST and nothing else. A reply cut
off mid-payload then swallowed whatever the user typed next, Enter and
Ctrl+C included, until a terminator or MAX_RESPONSE bytes turned up.
An ESC that was not part of an ST was rejected outright, so the parser
fell back to Alt+introducer and replayed the partial reply as
keystrokes.

find_st now stops at any C0 control other than BEL and ESC, at DEL,
and at an ESC not followed by `\`. It reports where the response
ended; the parser discards the partial reply without an event and
resumes at that byte. The key it starts comes through as if the
response had never been there, and so does a following response that
begins with ESC.
Implements input-spec §6.1. Terminfo keys go into the trie before the
xterm defaults so that the entry wins on conflicts, and input_init
ignored trie_add's -1 when the 1024 nodes ran out. One long key string
was enough to use up the trie and silently drop the defaults: an entry
with 1000-byte key strings left `ESC O A` parsing as Alt+O, A.

Key strings longer than MAX_TERMINFO_KEY (16) are now skipped. Real
key sequences are a handful of bytes, and the defaults use 307 nodes,
so the worst case (23 keys x 16 nodes = 368) always fits and trie_add
can no longer fail during init.

The tests build legacy-format terminfo entries in memory so they can
hit the 16/17-byte boundary and the exhaustion case without new binary
fixtures.
Review asked for the layout to be written down next to the code that
computes it, so the regions and their order can be checked at a glance
when sizes change.
natemoo-re added a commit that referenced this pull request Oct 9, 2026
Match createInput: the renderer option is `terminfo`, typed
`TerminalInfo`. Adds the first test that seeds createTerm from a detected
TerminalInfo (previously untested; test/caps.ts helpers were unused).

The stack changeset now covers only what this PR and #131 add —
detectTerminal/TerminalInfo, createTerm's option, term.capabilities, and
the update() signature change — since #132 carries its own changeset for
the input side.
@natemoo-re
natemoo-re force-pushed the feat/input-probe-events branch from 9f88c97 to 291910b Compare October 9, 2026 15:17
@natemoo-re
natemoo-re merged commit d8f2a24 into main Oct 9, 2026
12 checks passed
@natemoo-re
natemoo-re deleted the feat/input-probe-events branch October 9, 2026 15:18
natemoo-re added a commit that referenced this pull request Oct 9, 2026
Match createInput: the renderer option is `terminfo`, typed
`TerminalInfo`. Adds the first test that seeds createTerm from a detected
TerminalInfo (previously untested; test/caps.ts helpers were unused).

The stack changeset now covers only what this PR and #131 add —
detectTerminal/TerminalInfo, createTerm's option, term.capabilities, and
the update() signature change — since #132 carries its own changeset for
the input side.
natemoo-re added a commit that referenced this pull request Oct 9, 2026
#101's bespoke parse_osc() drew review for unbounded digit accumulation
on `ESC ] 9999...`. The rebuild drops that parser and relies on #132's
parse_osc_response(), which already bails once the OSC number passes
22 and caps payloads at MAX_RESPONSE. These tests pin that behavior for
OSC 22 so it cannot regress: BEL and ST terminators, the "0"
empty-stack reply, byte-at-a-time delivery, a broken ST, a 64-digit
OSC number, OSC 220, and an over-long payload (no event, parser
recovers for the next reply).
natemoo-re added a commit that referenced this pull request Oct 9, 2026
… them (renderer-spec §7.9)

Elements declare open(id, { pointerShape }). While
term.capabilities.pointerShape is true (raised by #132/#133 from the
probe's OSC 22 query reply), each render resolves the shape under the
pointer and appends `OSC 22 ; <shape> ST` to result.output when it
changes. The host keeps writing one buffer (cowboyd on #101). The
capability is the only gate; there is no createTerm option.

Everything lives in TypeScript; the wasm module and the packed encoding
are untouched, so there is no size or startup cost (#101 regressed
createTerm ~20% and grew the bundle 8.3 KB). Without the capability the
render path pays one boolean check and never reads pointerShape (a test
pins this with a counting getter). With it, the directive walk runs only
when the pointer is over something, and only a frame whose shape
changed copies output to append the sequence.

Resolution takes the last declaring id in Clay's pointer-over order:
pre-order within the topmost layer the pointer reaches, so the innermost
element wins and capture-mode floats hide what is beneath while
passthrough floats defer to it. snapshot() records its declared shapes
beside the packed bytes so pre-packed subtrees still participate.
Values outside the kitty/CSS vocabulary are ignored (and rejected by
validate()), so arbitrary strings never reach an OSC payload.

Restore (dreyfus92 on #101): set-only OSC 22 cannot pop, so the emitted
shape is the one piece of cross-frame state. It resets to "default"
when the pointer leaves or is omitted, and update() returns the reset
when the pointer-shape capability is withdrawn. Resize keeps it, since
the terminal's pointer did not change.
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