Emacs calendar: show more than 3 months?

Question

In Emacs, when you display the calendar with M-x calendar, you get a three-month display – last month, this month, and next month – in a new window that\'s just 8 l

Answer 1

It's not easy to do this, the code to generate calendar is:

(defun calendar-generate (month year)
  "Generate a three-month Gregorian calendar centered around MONTH, YEAR."
  ;; A negative YEAR is interpreted as BC; -1 being 1 BC, and so on.
  ;; Note that while calendars for years BC could be displayed as it
  ;; stands, almost all other calendar functions (eg holidays) would
  ;; at best have unpredictable results for such dates.
  (if (< (+ month (* 12 (1- year))) 2)
      (error "Months before January, 1 AD cannot be displayed"))
  (setq displayed-month month
        displayed-year year)
  (erase-buffer)
  (calendar-increment-month month year -1)
  (dotimes (i 3)
    (calendar-generate-month month year
                             (+ calendar-left-margin
                                (* calendar-month-width i)))
    (calendar-increment-month month year 1)))

Here, (dotimes (i 3) ...) generate 3 months in a row.

So if you want to generate more than 3 months in more than 1 row, you must override calendar-generate function by yourself, same as @Luke said.