" < body.txt # echo -e "row 1\nrow 2" | render_box.sh --title "Container" # # Why this exists: the agent has been miscounting dashes / spaces when # rendering boxes by hand, leading to misaligned `┐` and `│` columns. # Pipe content through this helper instead. set -euo pipefail W=128 TITLE="" while [[ $# -gt 0 ]]; do case "$1" in --title) TITLE="$2"; shift 2 ;; --width) W="$2"; shift 2 ;; -h|--help) sed -n '18,35p' "$0"; exit 0 ;; # skip SPDX/license header *) echo "Unknown arg: $1" >&2; exit 1 ;; esac done [[ -n "$TITLE" ]] || { echo "✖ --title is required" >&2; exit 1; } # One python invocation handles everything (title centering, body # padding/truncation, bottom border). Using `python3 -c` (not heredoc) # leaves the script's stdin available for the body content. exec python3 -c ' import sys title = sys.argv[1] W = int(sys.argv[2]) inner = W - 2 # corner-to-corner inside, between ┌ and ┐ content_w = W - 4 # usable area inside `│ ` and ` │` margins # Top — centered title. titled = f" {title} " pad = inner - len(titled) L = pad // 2 R = pad - L print("┌" + "─" * L + titled + "─" * R + "┐") # Body — one row per stdin line, padded/truncated to exact width. for raw in sys.stdin: line = raw.rstrip("\n") if len(line) > content_w: line = line[: content_w - 1] + "…" print("│ " + line + " " * (content_w - len(line)) + " │") # Bottom. print("└" + "─" * inner + "┘") ' "$TITLE" "$W"

#!/usr/bin/env bash # SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved. # SPDX-License-Identifier: Apache-2.0 # # Licensed under Apache-2.0 (full text: http://www.apache.org/licenses/LICENSE-2.0). # render_box.sh — Print a perfectly-aligned 128-char-wide light-box. # # Reads body content from stdin (one line per row) and emits: # ┌──── ────┐ (exactly 128 chars) # │ │ (one per stdin line) # └────────...────────┘ (exactly 128 chars) # # Empty stdin lines render as empty box rows. Body lines longer than 124 # chars are truncated with `…` (the agent should have caught that earlier; # the helper just refuses to break the right border). # # Usage: # render_box.sh --title "" < body.txt # echo -e "row 1\nrow 2" | render_box.sh --title "Container" # # Why this exists: the agent has been miscounting dashes / spaces when # rendering boxes by hand, leading to misaligned `┐` and `│` columns. # Pipe content through this helper instead. set -euo pipefail W=128 TITLE="" while [[ $# -gt 0 ]]; do case "$1" in --title) TITLE="$2"; shift 2 ;; --width) W="$2"; shift 2 ;; -h|--help) sed -n '18,35p' "$0"; exit 0 ;; # skip SPDX/license header *) echo "Unknown arg: $1" >&2; exit 1 ;; esac done [[ -n "$TITLE" ]] || { echo "✖ --title is required" >&2; exit 1; } # One python invocation handles everything (title centering, body # padding/truncation, bottom border). Using `python3 -c` (not heredoc) # leaves the script's stdin available for the body content. exec python3 -c ' import sys title = sys.argv[1] W = int(sys.argv[2]) inner = W - 2 # corner-to-corner inside, between ┌ and ┐ content_w = W - 4 # usable area inside `│ ` and ` │` margins # Top — centered title. titled = f" {title} " pad = inner - len(titled) L = pad // 2 R = pad - L print("┌" + "─" * L + titled + "─" * R + "┐") # Body — one row per stdin line, padded/truncated to exact width. for raw in sys.stdin: line = raw.rstrip("\n") if len(line) > content_w: line = line[: content_w - 1] + "…" print("│ " + line + " " * (content_w - len(line)) + " │") # Bottom. print("└" + "─" * inner + "┘") ' "$TITLE" "$W"