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howm-date.el
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howm-date.el
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;;; howm-date.el --- Wiki-like note-taking tool
;;; Copyright (C) 2002, 2003, 2004, 2005-2024
;;; HIRAOKA Kazuyuki <kakkokakko@gmail.com>
;;;
;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 1, or (at your option)
;;; any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; The GNU General Public License is available by anonymouse ftp from
;;; prep.ai.mit.edu in pub/gnu/COPYING. Alternately, you can write to
;;; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
;;; USA.
;;--------------------------------------------------------------------
(provide 'howm-date)
(require 'howm)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; insert & action-lock
(defvar howm-insert-date-pass-through nil)
(defvar howm-action-lock-date-future nil)
(defun howm-insert-date ()
(interactive)
(let ((date (format-time-string howm-date-format)))
(insert (format howm-insert-date-format date))
(howm-action-lock-date date t howm-insert-date-future)))
(defun howm-insert-dtime ()
(interactive)
(insert (format-time-string howm-dtime-format)))
;; Sorry for ugly behavior around "new" to keep backward compatibility.
(defun howm-action-lock-date (date &optional new future-p)
(let* ((pass-through (and new howm-insert-date-pass-through))
(prompt (howm-action-lock-date-prompt date new pass-through))
(immediate-chars (if pass-through "" "."))
(c (howm-read-string prompt immediate-chars "+-~0123456789"
pass-through pass-through)))
(cond
((null c) nil) ;; pass through
((string= c "")
(if new
t
(howm-action-lock-date-search date)))
((string-match "^[-+][0-9]+$" c)
(howm-action-lock-date-shift (string-to-number c) date))
((string-match "^[0-9]+$" c)
(howm-action-lock-date-set c date
(or future-p howm-action-lock-date-future)))
((string-match "^~\\([0-9]+\\)$" c)
(howm-action-lock-date-repeat (match-string-no-properties 1 c) date))
((string-match "^[.]$" c)
(howm-datestr-replace (howm-time-to-datestr)))
((and (string-match "^[-+~]$" c) pass-through)
(insert c))
(t (error (format "Can't understand %s." c))))))
(defun howm-action-lock-date-prompt (date new pass-through)
(let* ((dow (howm-datestr-day-of-week date))
(common-help "+num(shift), yymmdd(set), ~yymmdd(repeat)")
(today-help ", .(today)")
(help (cond ((and new pass-through)
common-help)
((and new (not pass-through))
(concat "RET(ok), " common-help today-help))
((not new)
(concat "RET(list), " common-help today-help))
(t
(error "Can't happen.")))))
(format "[%s] %s: " dow help)))
(defvar howm-date-current nil)
(make-variable-buffer-local 'howm-date-current)
(defun howm-action-lock-date-search (date)
(howm-set-command 'howm-action-lock-date-search)
(prog1
(howm-search date t)
(howm-action-lock-forward-escape)
(setq howm-date-current date)))
(defun howm-search-today ()
(interactive)
(howm-search-past 0))
(defun howm-search-past (&optional days-before)
(interactive "P")
(let* ((n (or days-before 0))
(today (format-time-string howm-date-format))
(target (howm-datestr-shift today 0 0 (- n))))
(howm-action-lock-date-search target)))
(defun howm-action-lock-date-shift (n date)
(howm-datestr-replace (howm-datestr-shift date 0 0 n)))
(defun howm-action-lock-date-set (val date &optional future-p)
(howm-datestr-replace (howm-datestr-expand val date future-p)))
(defvar howm-action-lock-date-repeat-max 200)
(defun howm-action-lock-date-repeat (until date)
(let ((every (read-from-minibuffer "Every? [RET(all), num(days), w(week), m(month), y(year)] ")))
(let ((max-d (howm-datestr-expand until date t))
(offset-y (if (string= every "y") 1 0))
(offset-m (if (string= every "m") 1 0))
(offset-d (or (cdr (assoc every '(("y" . 0) ("m" . 0) ("w" . 7))))
(max (string-to-number every) 1))))
(let ((d date)
(i 0)
(check t))
(catch 'too-many
(while (progn
(setq d (howm-datestr-shift d offset-y offset-m offset-d))
(howm-datestr<= d max-d))
(when (and check (>= i howm-action-lock-date-repeat-max))
(if (y-or-n-p (format "More than %d lines. Continue? " i))
(setq check nil)
(throw 'too-many nil)))
(howm-duplicate-line)
(howm-datestr-replace d)
(setq i (+ i 1))))))))
(defun howm-make-datestr (y m d)
(let ((ti (encode-time 0 0 0 d m y)))
(format-time-string howm-date-format ti)))
(defun howm-datestr-parse (date)
(string-match howm-date-regexp date)
(mapcar (lambda (pos)
(string-to-number (match-string-no-properties pos date)))
(list howm-date-regexp-year-pos
howm-date-regexp-month-pos
howm-date-regexp-day-pos)))
(defun howm-datestr-to-time (date)
(let* ((ymd (howm-datestr-parse date))
(y (car ymd))
(m (cadr ymd))
(d (cl-caddr ymd)))
(encode-time 0 0 0 d m y)))
(defun howm-time-to-datestr (&optional time)
(let ((x (decode-time time)))
(howm-make-datestr (nth 5 x) (nth 4 x) (nth 3 x))))
(defun howm-datestr-day-of-week (date)
(format-time-string "%a" (howm-datestr-to-time date)))
(defun howm-datestr-expand (date base &optional future-p)
(let* ((raw (howm-datestr-expand-general date base nil))
(future (howm-datestr-expand-general date base t))
(ret
(cond ((eq future-p 'closer)
(cl-labels ((to-f (d) (float-time (howm-datestr-to-time d)))
(delta (d1 d2) (abs (- (to-f d1) (to-f d2)))))
(if (< (delta raw base) (delta future base)) raw future)))
(future-p future)
(t raw))))
(unless (string= raw ret)
(message "Assume future date"))
ret))
(defun howm-datestr-expand-general (date base &optional future-p)
(let* ((base-ymd (howm-datestr-parse base))
(nval (format "%8s" date))
(given-ymd-str (mapcar (lambda (r)
(substring nval (car r) (cadr r)))
'((0 4) (4 6) (6 8))))
(ys (car given-ymd-str))
(ms (cadr given-ymd-str))
(ds (cl-caddr given-ymd-str)))
(when (string-match "^ +0+$" ys)
(setq ys "2000"))
(let* ((given-ymd (mapcar #'string-to-number (list ys ms ds)))
(carry nil) ;; to force future date
(dmy (cl-mapcar (lambda (ox nx)
(when future-p
(when (and carry (= nx 0))
(setq ox (+ ox 1)))
(setq carry
(cond ((= nx 0) nil)
((= nx ox) carry)
((< nx ox) t)
(t nil))))
(if (= nx 0) ox nx))
(reverse base-ymd) (reverse given-ymd)))
(d (car dmy))
(m (cadr dmy))
(y (cl-caddr dmy)))
(howm-make-datestr (if (<= y 99) (+ y 2000) y) m d))))
(defun howm-datestr-shift (date y m d)
(let* ((ymd (howm-datestr-parse date))
(oy (car ymd))
(om (cadr ymd))
(od (cl-caddr ymd)))
(howm-make-datestr (+ oy y) (+ om m) (+ od d))))
(defun howm-datestr<= (date1 date2)
(or (string< date1 date2)
(string= date1 date2)))
(defun howm-datestr-replace (date)
(let ((p (point)))
(while (not (looking-at howm-date-regexp))
(backward-char))
(replace-match date t t)
(goto-char p)))
(defun howm-duplicate-line ()
(let ((c (current-column))
(s (buffer-substring (line-beginning-position) (line-end-position))))
(end-of-line)
(insert "\n" s)
(move-to-column c)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; search for next/previous date
(defvar howm-date-forward-ymd-msg "Searching %s...")
(defvar howm-date-forward-ymd-limit 35)
(defun howm-date-forward-ymd (y m d)
(when (not howm-date-current)
(error "Not in date search."))
(let* ((new-date (howm-datestr-shift howm-date-current y m d))
(b (current-buffer))
(step (if (> (+ y m d) 0) +1 -1))
(c 0))
(when (catch :found
(while (progn
(when (howm-action-lock-date-search new-date)
(throw :found t))
(< c howm-date-forward-ymd-limit))
(setq new-date (howm-datestr-shift new-date 0 0 step))
(setq c (1+ c))
(when howm-date-forward-ymd-msg
(format howm-date-forward-ymd-msg new-date)))
(error "Not found within %d days." howm-date-forward-ymd-limit))
(when (not (eq (current-buffer) b))
(with-current-buffer b
(howm-view-kill-buffer)))
(howm-view-summary-check t))))
(defmacro howm-date-defun-f/b (func y m d)
`(defun ,func (&optional k)
(interactive "P")
(let ((n (or k 1)))
(howm-date-forward-ymd ,y ,m ,d))))
(howm-date-defun-f/b howm-date-forward 0 0 n)
(howm-date-defun-f/b howm-date-forward-month 0 n 0)
(howm-date-defun-f/b howm-date-forward-year n 0 0)
(howm-date-defun-f/b howm-date-backward 0 0 (- n))
(howm-date-defun-f/b howm-date-backward-month 0 (- n) 0)
(howm-date-defun-f/b howm-date-backward-year (- n) 0 0)
(let ((m howm-view-summary-mode-map))
(define-key m "+" 'howm-date-forward)
(define-key m "-" 'howm-date-backward)
(define-key m ")" 'howm-date-forward)
(define-key m "(" 'howm-date-backward)
(define-key m "}" 'howm-date-forward-month)
(define-key m "{" 'howm-date-backward-month)
(define-key m "]" 'howm-date-forward-year)
(define-key m "[" 'howm-date-backward-year)
)
;;; howm-date.el ends here