Function parseColWidthsComment

packages/app-core/src/lib/markdown-table.ts:227–236

(line: string)

/** Parse a `<!-- zen:cols=… -->` width-hint line into per-column pixel widths
 *  (`null` = auto). Returns null if the line isn't a zen:cols comment. */
export function parseColWidthsComment(line: string): Array<number | null> | null {
  const m = COLS_COMMENT_RE.exec(line)
  if (!m) return null
  return (m[1] ?? '').split(',').map((part) => {
    const t = part.trim().toLowerCase()
    if (t === '' || t === 'auto') return null
    const n = Number.parseInt(t, 10)
    return Number.isFinite(n) && n > 0 ? n : null
  })
}

/** Serialize per-column widths to a `<!-- zen:cols=… -->` line, or null when no
 *  column has an explicit width (so an un-resized table emits no comment). */