1 files changed, 118 insertions, 0 deletions
diff --git a/lisp/calendar/cal-china.el b/lisp/calendar/cal-china.el
index 538d2320b30..e266613680a 100644
--- a/lisp/calendar/cal-china.el
+++ b/lisp/calendar/cal-china.el
@@ -682,6 +682,124 @@ Echo Chinese date unless NOECHO is non-nil."
   "Chinese calendar equivalent of date diary entry."
   (format "Chinese date: %s" (calendar-chinese-date-string date)))
 
+;;;; diary support
+
+(autoload 'calendar-mark-1         "diary-lib")
+(autoload 'diary-mark-entries-1    "diary-lib")
+(autoload 'diary-list-entries-1    "diary-lib")
+(autoload 'diary-insert-entry-1    "diary-lib")
+(autoload 'diary-date-display-form "diary-lib")
+(autoload 'diary-make-date         "diary-lib")
+(autoload 'diary-ordinal-suffix    "diary-lib")
+(defvar diary-sexp-entry-symbol)
+(defvar entry)                    ;used by `diary-chinese-anniversary'
+
+(defvar calendar-chinese-month-name-array
+  ["正月" "二月" "三月" "四月" "五月" "六月"
+   "七月" "八月" "九月" "十月" "冬月" "臘月"])
+
+;;; NOTE: In the diary the cycle and year of a Chinese date is
+;;; combined using this formula: (+ (* cycle 100) year).
+;;;
+;;; These two functions convert to and back from this representation.
+(defun calendar-chinese-from-absolute-for-diary (date)
+  (pcase-let ((`(,c ,y ,m ,d) (calendar-chinese-from-absolute date)))
+    (list m d (+ (* c 100) y))))
+
+(defun calendar-chinese-to-absolute-for-diary (date)
+  (pcase-let ((`(,m ,d ,y) date))
+    (calendar-chinese-to-absolute
+     (list (floor y 100) (mod y 100) m d))))
+
+(defun calendar-chinese-mark-date-pattern (month day year &optional color)
+  (calendar-mark-1 month day year
+                   #'calendar-chinese-from-absolute-for-diary
+                   #'calendar-chinese-to-absolute-for-diary
+                   color))
+
+;;;###cal-autoload
+(defun diary-chinese-mark-entries ()
+  "Mark days in the calendar window that have Chinese date diary entries.
+Marks each entry in `diary-file' (or included files) visible in the calendar
+window.  See `diary-chinese-list-entries' for more information.
+
+This function is provided for use with `diary-nongregorian-marking-hook'."
+  (diary-mark-entries-1 #'calendar-chinese-mark-date-pattern
+                        calendar-chinese-month-name-array
+                        diary-chinese-entry-symbol
+                        #'calendar-chinese-from-absolute-for-diary))
+
+;;;###cal-autoload
+(defun diary-chinese-list-entries ()
+  "Add any Chinese date entries from the diary file to `diary-entries-list'.
+Chinese date diary entries must be prefixed by `diary-chinese-entry-symbol'
+\(normally a `C').  The same `diary-date-forms' govern the style
+of the Chinese calendar entries.  If a Chinese date diary entry begins with
+`diary-nonmarking-symbol', the entry will appear in the diary listing,
+but will not be marked in the calendar.
+
+This function is provided for use with `diary-nongregorian-listing-hook'."
+  (diary-list-entries-1 calendar-chinese-month-name-array
+                        diary-chinese-entry-symbol
+                        #'calendar-chinese-from-absolute-for-diary))
+
+;;;###cal-autoload
+(defun diary-chinese-anniversary (month day &optional year mark)
+  "Like `diary-anniversary' (which see) but accepts Chinese date."
+  (pcase-let* ((ddate (diary-make-date month day year))
+               (`(,dc ,dy ,dm ,dd)      ;diary chinese date
+                (if year
+                    (calendar-chinese-from-absolute
+                     (calendar-chinese-to-absolute-for-diary ddate))
+                  (list nil nil (calendar-extract-month ddate)
+                        (calendar-extract-day ddate))))
+               (`(,cc ,cy ,cm ,cd)      ;current chinese date
+                (calendar-chinese-from-absolute
+                 (calendar-absolute-from-gregorian date)))
+               (diff (if (and dc dy)
+                         (+ (* 60 (- cc dc)) (- cy dy))
+                       100)))
+    (and (> diff 0) (= dm cm) (= dd cd)
+         (cons mark (format entry diff (diary-ordinal-suffix diff))))))
+
+;;;###cal-autoload
+(defun diary-chinese-insert-anniversary-entry (&optional arg)
+  "Insert an anniversary diary entry for the Chinese date at point.
+Prefix argument ARG makes the entry nonmarking."
+  (interactive "P")
+  (let ((calendar-date-display-form (diary-date-display-form)))
+    (diary-make-entry
+     (format "%s(diary-chinese-anniversary %s)"
+             diary-sexp-entry-symbol
+             (calendar-date-string
+              (calendar-chinese-from-absolute-for-diary
+               (calendar-absolute-from-gregorian (calendar-cursor-to-date t)))))
+     arg)))
+
+;;;###cal-autoload
+(defun diary-chinese-insert-entry (&optional arg)
+  "Insert a diary entry for the Chinese date at point."
+  (interactive "P")
+  (diary-insert-entry-1 nil arg calendar-chinese-month-name-array
+                        diary-chinese-entry-symbol
+                        #'calendar-chinese-from-absolute-for-diary))
+
+;;;###cal-autoload
+(defun diary-chinese-insert-monthly-entry (&optional arg)
+  "Insert a monthly diary entry for the Chinese date at point."
+  (interactive "P")
+  (diary-insert-entry-1 'monthly arg calendar-chinese-month-name-array
+                        diary-chinese-entry-symbol
+                        #'calendar-chinese-from-absolute-for-diary))
+
+;;;###cal-autoload
+(defun diary-chinese-insert-yearly-entry (&optional arg)
+  "Insert a yearly diary entry for the Chinese date at point."
+  (interactive "P")
+  (diary-insert-entry-1 'yearly arg calendar-chinese-month-name-array
+                        diary-chinese-entry-symbol
+                        #'calendar-chinese-from-absolute-for-diary))
+
 (provide 'cal-china)
 
 ;;; cal-china.el ends here