code-infra-01
acd15ed144
ci/woodpecker/pr/ci Pipeline was successful
Rebased onto current next and composes the two sibling mechanisms per the O1 ruling: the cursor-row draft transition stays the authoritative runtime-agnostic delivered verdict; next's locate_input_box (two shapes: prompt glyph, pi rule box) is adopted as positive DRAFT evidence only, covering the cursor-row check's blind spot on redrawn TUIs that park the cursor off the input line. Box-absence proves nothing and can never produce UNDELIVERED: a shapeless-but-submitting pane delivers via the cursor-row transition regardless. The verdict suite gains fixtures 6 and 6b: the 2026-09-04 scratch probe is the regression test (shapeless REPL that submits must report delivered; shape probing alone exited 2 with retry advice on a consumed message), plus the raw/no-echo shapeless guard arm. Measured limit recorded in the suite: a shapeless cooked non-reading pane is indistinguishable from a delivering one by any runtime-agnostic signal available to the sender. Rerun evidence: pipefail scanner 7/7, glyph-agnostic suite 6/6, verdict suite 8/8, live shapeless probe rc=0 delivered with consumption proof.
221 lines
12 KiB
Bash
Executable File
221 lines
12 KiB
Bash
Executable File
#!/usr/bin/env bash
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# send-message.sh — reliably deliver a message to a tmux pane running an
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# interactive REPL (e.g. a Claude Code / Codex agent).
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#
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# WHY THIS EXISTS
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# Pasting multi-line text into an interactive agent REPL via `tmux send-keys`
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# is unreliable: the text lands in the input box but a single trailing Enter
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# in the same keystroke stream is frequently swallowed, so the message sits as
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# an UNSUBMITTED DRAFT ("Press up to edit queued messages") and the agent never
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# sees it. The mechanical fix is: paste as a bracketed paste (so embedded
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# newlines don't submit early), pause, then send Enter as its OWN keystroke,
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# pause, and send Enter again to flush. An extra Enter on an empty prompt is a
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# no-op in Claude Code, so the double-Enter is safe.
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#
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# USAGE
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# send-message.sh [-L socket_name] -t <target> -m "message"
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# send-message.sh [-L socket_name] -t <target> -f <file>
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# echo "message" | send-message.sh [-L socket_name] -t <target>
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# ssh host bash -s -- -L socket -t <target> -b "$(base64 -w0 <<<msg)" < send-message.sh
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#
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# OPTIONS
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# -L NAME tmux socket name passed to `tmux -L NAME` (optional)
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# -t TARGET tmux target: session, or session:window.pane [required]
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# -m MESSAGE message text (single- or multi-line)
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# -f FILE read message from FILE instead of -m
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# -b BASE64 message as base64 (ssh-safe transport; decoded internally)
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# -r N Enter-flush attempts (default 2)
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# -v verbose: print a short tail of the pane after delivery
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# -h help
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#
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# EXIT CODES
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# 0 delivered (submitted) or queued (agent busy; will process when free)
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# 1 tmux target not found
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# 2 submission NOT confirmed — either still an unsubmitted draft, or the REPL
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# input box could not be located to confirm the message actually landed.
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# Delivered verdicts are runtime-agnostic (cursor-row draft transition, or
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# the queued banner); locate_input_box() below adds positive DRAFT evidence
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# for panes that render a recognizable box, and never gates delivery on a
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# runtime's rendering shape.
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# Delivery is NEVER inferred from absence of evidence: if we cannot positively
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# see the input box clear of the message (or the queued banner), we fail loud
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# so the sender learns immediately instead of a silent worker->lead stall.
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# 3 usage error
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set -uo pipefail
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SOCKET_NAME=""; TARGET=""; MSG=""; FILE=""; B64=""; RETRIES=2; VERBOSE=0
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usage() { sed -n '2,34p' "$0"; exit "${1:-3}"; }
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while getopts "L:t:m:f:b:r:vh" o; do
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case "$o" in
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L) SOCKET_NAME=$OPTARG ;;
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t) TARGET=$OPTARG ;; m) MSG=$OPTARG ;; f) FILE=$OPTARG ;; b) B64=$OPTARG ;;
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r) RETRIES=$OPTARG ;; v) VERBOSE=1 ;; h) usage 0 ;; *) usage 3 ;;
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esac
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done
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[ -n "$TARGET" ] || { echo "ERROR: -t TARGET is required" >&2; usage 3; }
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if [ -n "$B64" ]; then MSG=$(printf '%s' "$B64" | base64 -d) || { echo "ERROR: bad -b base64" >&2; exit 3; }
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elif [ -n "$FILE" ]; then [ -r "$FILE" ] || { echo "ERROR: cannot read $FILE" >&2; exit 3; }; MSG=$(cat -- "$FILE")
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elif [ -z "$MSG" ] && [ ! -t 0 ]; then MSG=$(cat)
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fi
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[ -n "$MSG" ] || { echo "ERROR: empty message (use -m, -f, or stdin)" >&2; exit 3; }
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tmux_cmd=(tmux)
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if [ -n "$SOCKET_NAME" ]; then
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tmux_cmd+=(-L "$SOCKET_NAME")
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fi
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# tmux accepts `=session` for some commands, but pane-level commands such as
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# capture-pane require a pane-qualified target. Keep exact-session addressing
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# convenient while avoiding accidental prefix matches.
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EFFECTIVE_TARGET=$TARGET
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if [[ "$TARGET" == =* && "$TARGET" != *:* ]]; then
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EFFECTIVE_TARGET="${TARGET}:0.0"
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fi
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# Target must resolve to a live pane.
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if ! "${tmux_cmd[@]}" list-panes -t "$EFFECTIVE_TARGET" >/dev/null 2>&1; then
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echo "ERROR: tmux target not found: $TARGET" >&2; exit 1
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fi
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QUEUED_RE='Press up to edit queued messages'
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# A distinctive tail of the message to spot an unsubmitted draft on the input line.
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snippet=$(printf '%s' "$MSG" | tr '\n' ' ' | tr -s ' ' | sed 's/[^[:print:]]//g' | tail -c 32)
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# 1) Paste the body as a bracketed paste so multi-line content does not submit
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# line-by-line. load-buffer/paste-buffer is far safer than `send-keys -l`.
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# Buffer name MUST be unique per invocation: concurrent senders on the shared
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# tmux server race a fixed name (load overwrites load, -d deletes underneath),
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# cross-delivering or dropping messages — bit the fleet on the 2026-07-09
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# simultaneous restart (briefs swapped between sessions).
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BUF="__mosaic_send_$$_$(date +%s%N)"
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printf '%s' "$MSG" | "${tmux_cmd[@]}" load-buffer -b "$BUF" -
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# -p = bracketed paste when the client supports it; fall back if not.
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"${tmux_cmd[@]}" paste-buffer -d -p -b "$BUF" -t "$EFFECTIVE_TARGET" 2>/dev/null \
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|| "${tmux_cmd[@]}" paste-buffer -d -b "$BUF" -t "$EFFECTIVE_TARGET" \
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|| "${tmux_cmd[@]}" delete-buffer -b "$BUF" 2>/dev/null
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# ^ -d deletes the buffer only on a SUCCESSFUL paste; if both attempts fail
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# (e.g. the target vanished since the liveness check), delete explicitly —
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# named buffers are exempt from tmux's buffer-limit eviction, so orphans
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# would otherwise accumulate forever.
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sleep 0.5
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# 2) Submit, then POSITIVELY confirm submission by DRAFT TRANSITION, not by prompt
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# glyph. The historical bug was treating ABSENCE of a draft as delivery; the
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# 2026-08 fix over-corrected to glyph inference (grep '❯|^>|│ >'), which locates
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# only Claude Code's box and false-NEGATIVES every glyphless REPL (pi renders a
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# U+2500 rule, no glyph) — a delivered message reported "UNDELIVERED", driving a
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# retry that duplicates it. Runtime-agnostic evidence: our message tail sits on
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# the INPUT line (located by the cursor row, not a glyph) BEFORE Enter, and has
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# LEFT it AFTER — that transition is positive proof of submission and needs no
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# glyph. Absence alone still never means delivered: if we never saw our draft on
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# the input line we stay UNCONFIRMED (wrong/dead pane), and a draft that never
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# leaves the input line stays a DRAFT (exit 2), preserving both historical guards.
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_cursor_line() { # echo the pane's current input (cursor) line, glyph-free
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local cy line
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cy=$("${tmux_cmd[@]}" display-message -p -t "$EFFECTIVE_TARGET" -F '#{cursor_y}' 2>/dev/null) || return 1
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[ -n "$cy" ] || return 1
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"${tmux_cmd[@]}" capture-pane -t "$EFFECTIVE_TARGET" -p 2>/dev/null | sed -n "$((cy + 1))p"
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}
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_draft_on_input() { # true iff our message tail is sitting on the input line now
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[ -n "$snippet" ] || return 1
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grep -qF "$snippet" <<<"$(_cursor_line)"
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}
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# Locate the REPL input box in a captured pane. Prints the box's contents on
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# stdout and returns 0 when the box was FOUND; returns 1 when it could not
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# be located at all. Found-but-empty is a real, distinct answer (an empty input
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# box is what a submitted message leaves behind), so the caller must branch on
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# the return code, never on whether the output is empty.
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#
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# Two REPL shapes are recognised:
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# * a prompt-glyph line — `❯`, a leading `>`, or `│ >`. Claude Code and most
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# readline REPLs.
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# * a box drawn as two horizontal `─` rules with the input between them and NO
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# prompt glyph anywhere. pi renders this. Anchoring on the LAST rule pair is
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# what makes it safe: agent output can contain its own rules, but nothing is
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# drawn below the input box except the status line.
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#
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# Compose authority rule (#1332 O1): this function is POSITIVE DRAFT EVIDENCE
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# ONLY. A located box still carrying our tail is affirmative proof the message
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# was not consumed (the cursor-row check's blind spot: a redrawn TUI can park
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# the cursor off the input line, which the draft-transition anchor cannot see).
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# Its failure to find a box proves NOTHING and must never produce an
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# UNDELIVERED verdict: a shapeless-but-submitting pane delivers via the
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# cursor-row transition regardless (measured, scratch probe 2026-09-04;
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# shapeless REPL consumed the message while shape probing alone reported
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# "may be UNDELIVERED" — the exact #1257 regression this split prevents).
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locate_input_box() {
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local pane=$1 glyph_line rule_lines top bottom
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glyph_line=$(printf '%s\n' "$pane" | grep -E '❯|^>|│ >' | tail -1)
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if [ -n "$glyph_line" ]; then printf '%s\n' "$glyph_line"; return 0; fi
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rule_lines=$(printf '%s\n' "$pane" | grep -nE '^[[:space:]]*─{4,}[[:space:]]*$' | cut -d: -f1 | tail -2)
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[ -n "$rule_lines" ] || return 1
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# Split the (at most two) captured line numbers with parameter expansion. Not
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# `head -1`: piping into an early-exiting consumer SIGPIPEs the producer, which
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# under `set -euo pipefail` aborts the caller with rc=141 and no output. The
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# scripts/pipefail-early-exit.test.mjs guard reds on that shape, correctly.
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# With one rule captured both halves resolve to the same value and the
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# ordering test below rejects it, which is the answer we want anyway.
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top=${rule_lines%%$'\n'*}
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bottom=${rule_lines##*$'\n'}
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[ "$top" != "$bottom" ] || return 1
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[ "$bottom" -gt "$top" ] || return 1
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# An empty range (adjacent rules) prints nothing and still returns 0: found,
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# empty, which is the delivered shape.
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printf '%s\n' "$pane" | sed -n "$((top + 1)),$((bottom - 1))p"
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return 0
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}
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# Baseline: after the paste, our draft must be on the input line. This is positive
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# proof we are on the right pane and the paste landed — the anchor the transition
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# check measures against.
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saw_draft=0
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_draft_on_input && saw_draft=1
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status="unconfirmed"
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for attempt in $(seq 1 $((RETRIES + 1))); do
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"${tmux_cmd[@]}" send-keys -t "$EFFECTIVE_TARGET" Enter
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sleep 1.2
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pane=$("${tmux_cmd[@]}" capture-pane -t "$EFFECTIVE_TARGET" -p 2>/dev/null)
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if grep -qF "$QUEUED_RE" <<<"$pane"; then
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status="queued"; break
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fi
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# POSITIVE draft evidence from a located input box, when one exists. This is
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# the cursor-row check's blind spot: a redrawn TUI (pi's box) can park the
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# cursor off the input line, which the draft-transition anchor cannot see,
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# while a pane in COOKED mode (a plain shell whose foreground process never
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# reads stdin) echoes our paste via the kernel line discipline and moves the
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# cursor off it on Enter, indistinguishable from a real submit by cursor row
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# alone. If a locatable box still carries our tail, that is affirmative proof
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# the message was not consumed. Absence of a recognizable shape is never used
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# for anything — that inference is the original E7 bug, and the delivered
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# verdict stays with the runtime-agnostic cursor-row transition.
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if inputbox=$(locate_input_box "$pane"); then
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if [ -n "$snippet" ] && grep -qF "$snippet" <<<"$inputbox"; then
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status="draft"; continue
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fi
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fi
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if [ "$saw_draft" = 1 ]; then
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if _draft_on_input; then
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status="draft"; continue # still on the input line => not submitted; flush + retry
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fi
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status="delivered"; break # left the input line => positively submitted
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fi
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# No confirmed baseline yet: try to (re)acquire it; never infer delivery from absence.
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if _draft_on_input; then saw_draft=1; status="draft"; continue; fi
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status="unconfirmed"; continue
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done
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[ "$VERBOSE" = 1 ] && { echo "--- pane tail ($TARGET) ---"; printf '%s\n' "$pane" | tail -4; echo "---"; }
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case "$status" in
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delivered) echo "✓ delivered to $TARGET"; exit 0 ;;
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queued) echo "✓ queued to $TARGET (agent busy — will process when it returns to prompt)"; exit 0 ;;
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draft) echo "✗ still an unsubmitted draft on $TARGET after $RETRIES flush attempts" >&2; exit 2 ;;
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unconfirmed) echo "✗ could not confirm submission on $TARGET: REPL input prompt not locatable after $((RETRIES + 1)) attempts — message may be UNDELIVERED (check target/pane, retry, or escalate)" >&2; exit 2 ;;
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*) echo "✗ could not confirm submission on $TARGET (unexpected state '$status')" >&2; exit 2 ;;
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esac
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