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;;; text-conf.el --- My configurations about plain text files. -*- lexical-binding: t; -*-
(require 'text-mode)
(require 'rx)
;; (declare-function #'center-buffer-on "center-buffer" nil)
;; (declare-function #'center-buffer-off "center-buffer" nil)
;; (declare-function #'center-buffer-toggle "center-buffer" nil)
;; (define-key text-mode-map (vector 'f8) nil)
;;;###autoload
(defvar insert-section-heading-history nil
"The history of inserted section heading strings")
;;;###autoload
(defun insert-section-heading (custom-heading)
"Insert a heading line below.
If CUSTOM-HEADING is non-nil, then use a custom heading.
The user can input any string as a basic constituent of a
heading. The inputed string will be repeated (floor N M) times,
where N is the length of the current line and M is the lenght of
the input string. After this repeat the first (remainder N M)
characters of the input string will be inserted as well to cover
exactly the current ilne."
(interactive "P")
(let* ((current-length (- (point-at-eol)
(point-at-bol)))
(heading (cond
((null custom-heading) "-")
(t (read-string "Enter a custom heading: "
nil insert-section-heading-history
"-" t))))
(floor-length (floor current-length (length heading)))
(remainder (% current-length (length heading)))
(remainder-string (substring heading 0 remainder))
(index 0))
(save-excursion
(goto-char (line-end-position))
(newline)
(while (< index floor-length)
(message "index: %s" index)
(message "floor: %s" floor-length)
(insert heading)
(setq index (1+ index)))
(insert remainder-string))))
;;;###autoload
(defun correct-length (str)
"Return the length of STR.
Characters that take up more than one column will be counted with
1.7 columns."
(declare (side-effect-free t) (pure t))
(let ((len 0))
(mapc (lambda (char)
(let ((name (get-char-code-property char 'name))
(decomposition (get-char-code-property char 'decomposition)))
(cond
((or (and
(stringp name)
(string-match (rx-to-string '(seq bos "CJK"))
name))
(eq (car decomposition) 'wide))
(setq len (+ len 1.7)))
((setq len (1+ len))))))
str)
(floor len)))
;;;###autoload
(defun center-string-in-width (str width)
"Add spaces to STR so that it is centered in a box which is WIDTH wide."
(let ((len (correct-length str)))
(cond
((> len width)
(error "String %s longer than %d" str width))
(t (format "%s%s"
(make-string (round (- width len) 2)
32)
str)))))
;;;###autoload
(defvar make-block-history nil
"The history of block quote descriptions.")
;;;###autoload
(defun make-block (&optional description)
"Surround the current line or the region in a block.
If DESCRIPTION is non-nil, ask for a description and put the
DESCRIPTION above the block."
(interactive "P")
(let* ((beg (cond
((use-region-p)
(region-beginning))
((line-beginning-position))))
(end (cond
((use-region-p)
(region-end))
((line-end-position))))
(end-marker (set-marker (make-marker) (1+ end)))
(fill-line (make-string fill-column ?=))
(header (cond
(description
(list fill-line
"\n"
(center-string-in-width
(read-string "Description of the block: "
nil make-block-history nil t)
fill-column)
"\n"
fill-line))
(t (list fill-line)))))
(save-excursion
(goto-char beg)
(while (<= (point) (1- (marker-position end-marker)))
(center-line)
(forward-line 1))
(goto-char beg)
(mapc #'insert header)
(newline)
(goto-char (1- (marker-position end-marker)))
(set-marker end-marker nil)
(newline)
(insert fill-line))))
;;;###autoload
(defun durand-next-page (&optional arg)
"Move forward ARG pages and narrow to page.
The only differences with `narrow-to-page' are that a nil
argument means 1, and that after narrowing this moves the cursor
to the beginning."
(interactive "p")
(narrow-to-page arg)
(goto-char (point-min)))
;;;###autoload
(defun durand-previous-page (&optional arg)
"Move backward ARG pages and narrow to page.
Pass (- (prefix-numeric-value arg)) to `durand-next-page'."
(interactive "p")
(durand-next-page (- (prefix-numeric-value arg))))
(define-key text-mode-map (vector ?\s-m) #'durand-previous-page)
(define-key text-mode-map (vector ?\s-รน) #'durand-next-page)
;; Insert time stamps
;;;###autoload
(defun durand-insert-timestamp (&optional arg)
"Insert the time stamp for now.
If ARG is non-nil, use a more verbose format."
(interactive "P")
(let ((time-format (cond (arg "%F %T.%6N")
("%F"))))
(insert (format-time-string time-format))))
(define-key global-map (vector ?\H-=) #'durand-insert-timestamp)
;; a diff-dwim
(autoload 'vc-diff "vc.el")
;;;###autoload
(defun durand-diff-dwim (&optional arg)
"Run `diff-buffer-with-file' or `vc-diff'."
(interactive "P")
(cond
((and (or (not (buffer-modified-p))
(equal arg (list 16)))
(vc-registered (buffer-file-name)))
(vc-diff arg t))
((buffer-modified-p)
(diff-buffer-with-file
(cond
(arg (read-buffer "Choose a buffer to diff: "
(current-buffer) t))
((current-buffer)))))
((user-error "No reasonable way to diff"))))
(define-key global-map (vector ?\C-\M-=) #'durand-diff-dwim)
(provide 'text-conf)
;;; text-conf.el ends here.
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