98 lines
4.3 KiB
Bash
Executable File
98 lines
4.3 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 -t <target> -m "message"
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# send-message.sh -t <target> -f <file>
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# echo "message" | send-message.sh -t <target>
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# ssh host bash -s -- -t <target> -b "$(base64 -w0 <<<msg)" < send-message.sh
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#
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# OPTIONS
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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 message still appears to be an unsubmitted draft after retries
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# 3 usage error
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set -uo pipefail
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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 "t:m:f:b:r:vh" o; do
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case "$o" in
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t) TARGET=$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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# Target must resolve to a live pane.
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if ! tmux list-panes -t "$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' "$MSG" | tr '\n' ' ' | tr -s ' ' | sed 's/[^[:print:]]//g' | tail -c 32)
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# 1) Paste the body as a bracketed paste so multi-line content does not submit
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# line-by-line. load-buffer/paste-buffer is far safer than `send-keys -l`.
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printf '%s' "$MSG" | tmux load-buffer -b __mosaic_send -
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# -p = bracketed paste when the client supports it; fall back if not.
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tmux paste-buffer -d -p -b __mosaic_send -t "$TARGET" 2>/dev/null \
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|| tmux paste-buffer -d -b __mosaic_send -t "$TARGET"
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sleep 0.5
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# 2) Submit, then verify; flush with another Enter if it is still a draft.
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status="sent"
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for attempt in $(seq 1 $((RETRIES + 1))); do
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tmux send-keys -t "$TARGET" Enter
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sleep 1.2
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pane=$(tmux capture-pane -t "$TARGET" -p 2>/dev/null)
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if printf '%s' "$pane" | grep -qF "$QUEUED_RE"; then
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status="queued"; break
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fi
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# Draft heuristic: the prompt glyph line still carries our message tail.
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# (Submitted messages scroll up into history; a draft stays on the ❯ line.)
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promptline=$(printf '%s' "$pane" | grep -E '❯|^>|│ >' | tail -1)
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if [ -n "$snippet" ] && printf '%s' "$promptline" | grep -qF "$snippet"; then
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status="draft"; continue
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fi
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status="delivered"; break
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done
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[ "$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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*) echo "✓ sent to $TARGET (submission state indeterminate; verify with -v)"; exit 0 ;;
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esac
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