84 lines
2.1 KiB
Bash
Executable File
84 lines
2.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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usage() {
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cat <<'USAGE'
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Usage: wait-for-text.sh -t target -p pattern [options]
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Poll a tmux pane for text and exit when found.
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Options:
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-t, --target tmux target (session:window.pane), required
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-p, --pattern regex pattern to look for, required
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-F, --fixed treat pattern as a fixed string (grep -F)
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-T, --timeout seconds to wait (integer, default: 15)
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-i, --interval poll interval in seconds (default: 0.5)
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-l, --lines number of history lines to inspect (integer, default: 1000)
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-h, --help show this help
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USAGE
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}
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target=""
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pattern=""
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grep_flag="-E"
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timeout=15
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interval=0.5
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lines=1000
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while [[ $# -gt 0 ]]; do
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case "$1" in
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-t|--target) target="${2-}"; shift 2 ;;
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-p|--pattern) pattern="${2-}"; shift 2 ;;
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-F|--fixed) grep_flag="-F"; shift ;;
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-T|--timeout) timeout="${2-}"; shift 2 ;;
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-i|--interval) interval="${2-}"; shift 2 ;;
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-l|--lines) lines="${2-}"; shift 2 ;;
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-h|--help) usage; exit 0 ;;
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*) echo "Unknown option: $1" >&2; usage; exit 1 ;;
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esac
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done
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if [[ -z "$target" || -z "$pattern" ]]; then
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echo "target and pattern are required" >&2
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usage
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exit 1
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fi
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if ! [[ "$timeout" =~ ^[0-9]+$ ]]; then
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echo "timeout must be an integer number of seconds" >&2
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exit 1
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fi
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if ! [[ "$lines" =~ ^[0-9]+$ ]]; then
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echo "lines must be an integer" >&2
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exit 1
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fi
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if ! command -v tmux >/dev/null 2>&1; then
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echo "tmux not found in PATH" >&2
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exit 1
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fi
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# End time in epoch seconds (integer, good enough for polling)
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start_epoch=$(date +%s)
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deadline=$((start_epoch + timeout))
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while true; do
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# -J joins wrapped lines, -S uses negative index to read last N lines
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pane_text="$(tmux capture-pane -p -J -t "$target" -S "-${lines}" 2>/dev/null || true)"
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if printf '%s\n' "$pane_text" | grep $grep_flag -- "$pattern" >/dev/null 2>&1; then
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exit 0
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fi
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now=$(date +%s)
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if (( now >= deadline )); then
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echo "Timed out after ${timeout}s waiting for pattern: $pattern" >&2
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echo "Last ${lines} lines from $target:" >&2
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printf '%s\n' "$pane_text" >&2
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exit 1
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fi
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sleep "$interval"
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done
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