Function formatDiffStat

packages/computer/src/git/cli.ts:408–440

* `--stat`: a per-file line with a `+`/`-` bar plus a summary * footer. The graph is scaled-down only when the widest file's * total exceeds the column budget, mirroring real git closely * enough for a human to read and a script to grep the footer.

(entries: DiffSummary[])

 * enough for a human to read and a script to grep the footer.
 */
function formatDiffStat(entries: DiffSummary[]): string {
  if (entries.length === 0) return "";
  const nameWidth = Math.max(...entries.map((e) => e.path.length));
  const maxTotal = Math.max(...entries.map((e) => e.insertions + e.deletions));
  // Cap the bar at 60 columns the way git's default terminal
  // width does; scale proportionally when any file exceeds it.
  const budget = 60;
  const scale = maxTotal > budget ? budget / maxTotal : 1;

  const lines: string[] = [];
  let totalIns = 0;
  let totalDel = 0;
  for (const e of entries) {
    totalIns += e.insertions;
    totalDel += e.deletions;
    const total = e.insertions + e.deletions;
    const plus = Math.round(e.insertions * scale);
    const minus = Math.round(e.deletions * scale);
    const bar = `${"+".repeat(plus)}${"-".repeat(minus)}`;
    lines.push(` ${e.path.padEnd(nameWidth)} | ${String(total).padStart(4)} ${bar}`);
  }

  const fileWord = entries.length === 1 ? "file" : "files";
  const parts = [`${entries.length} ${fileWord} changed`];
  if (totalIns > 0) {
    parts.push(`${totalIns} ${totalIns === 1 ? "insertion(+)" : "insertions(+)"}`);
  }
  if (totalDel > 0) {
    parts.push(`${totalDel} ${totalDel === 1 ? "deletion(-)" : "deletions(-)"}`);
  }
  lines.push(` ${parts.join(", ")}`);
  return `${lines.join("\n")}\n`;
}

// ---------------------------------------------------------------
// init