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master @ 54 LINES
 
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// Classic cal(1) month grid, Monday-first, 20 cells wide. Marked days
// get a * prefix in the separator column so the grid never shifts.
import { center, checkGrid } from "../../lib/ascii";

export interface Props {
  year: number;
  /** 1-12. */
  month: number;
  marks?: number[];
}

export const CAL_W = 20;

const MONTHS = [
  "JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE",
  "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER",
];

export function buildCalendar(year: number, month: number, marks: number[] = []): 
string {
  const marked = new Set(marks);
  // Monday-first offset of the 1st.
  const offset = (new Date(Date.UTC(year, month - 1, 1)).getUTCDay() + 6) % 7;
  const days = new Date(Date.UTC(year, month, 0)).getUTCDate();

  const lines = [center(`${MONTHS[month - 1]} ${year}`, CAL_W), "MO TU WE TH FR SA
 SU"];

  let week: string[] = Array.from({ length: offset }, () => "  ");
  for (let d = 1; d <= days; d++) {
    week.push(String(d).padStart(2));
    if (week.length === 7) {
      lines.push(weekLine(week, marked));
      week = [];
    }
  }
  if (week.length) {
    while (week.length < 7) week.push("  ");
    lines.push(weekLine(week, marked));
  }

  return checkGrid(lines.join("\n"), CAL_W, "calendar");
}

function weekLine(cells: string[], marked: Set<number>): string {
  let out = "";
  cells.forEach((c, i) => {
    const day = parseInt(c, 10);
    out += (i === 0 ? "" : marked.has(day) ? "*" : " ") + c;
  });
  // A marked Monday has no separator column; flag it inside the cell.
  const first = parseInt(cells[0], 10);
  if (marked.has(first) && first < 10) out = "*" + out.slice(1);
  return out.trimEnd();
}


// Classic cal(1) month grid, Monday-first, 
20 cells wide. Marked days
// get a * prefix in the separator column so
 the grid never shifts.
import { center, checkGrid } from "../../lib
/ascii";

export interface Props {
  year: number;
  /** 1-12. */
  month: number;
  marks?: number[];
}

export const CAL_W = 20;

const MONTHS = [
  "JANUARY", "FEBRUARY", "MARCH", "APRIL", "
MAY", "JUNE",
  "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", 
"NOVEMBER", "DECEMBER",
];

export function buildCalendar(year: number, 
month: number, marks: number[] = []): string
 {
  const marked = new Set(marks);
  // Monday-first offset of the 1st.
  const offset = (new Date(Date.UTC(year, mo
nth - 1, 1)).getUTCDay() + 6) % 7;
  const days = new Date(Date.UTC(year, month
, 0)).getUTCDate();

  const lines = [center(`${MONTHS[month - 1]
} ${year}`, CAL_W), "MO TU WE TH FR SA SU"];

  let week: string[] = Array.from({ length: 
offset }, () => "  ");
  for (let d = 1; d <= days; d++) {
    week.push(String(d).padStart(2));
    if (week.length === 7) {
      lines.push(weekLine(week, marked));
      week = [];
    }
  }
  if (week.length) {
    while (week.length < 7) week.push("  ");
    lines.push(weekLine(week, marked));
  }

  return checkGrid(lines.join("\n"), CAL_W, 
"calendar");
}

function weekLine(cells: string[], marked: S
et<number>): string {
  let out = "";
  cells.forEach((c, i) => {
    const day = parseInt(c, 10);
    out += (i === 0 ? "" : marked.has(day) ?
 "*" : " ") + c;
  });
  // A marked Monday has no separator column
; flag it inside the cell.
  const first = parseInt(cells[0], 10);
  if (marked.has(first) && first < 10) out =
 "*" + out.slice(1);
  return out.trimEnd();
}

 
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