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;;; custom-line-paragraph.el --- -*- coding: utf-8; lexical-binding: t; -*-
;;; Commentary:
;;
;;; Code:
(use-package expand-region
:demand t) ;; used w/in join paragraph
(defun cj/join-line-or-region ()
"Join lines in the active region or join the current line with the previous one."
(interactive)
(if (use-region-p)
(let ((beg (region-beginning))
(end (copy-marker (region-end))))
(goto-char beg)
(while (< (point) end)
(join-line 1))
(goto-char end)
(newline))
;; No region - only join if there's a previous line
(when (> (line-number-at-pos) 1)
(join-line))
(newline)))
(defun cj/join-paragraph ()
"Join all lines in the current paragraph using `cj/join-line-or-region'."
(interactive)
(er/mark-paragraph) ;; from package expand region
(cj/join-line-or-region (region-beginning)(region-end))
(forward-line))
(defun cj/duplicate-line-or-region (&optional comment)
"Duplicate the current line or active region below.
Comment the duplicated text when optional COMMENT is non-nil."
(interactive "P")
(let* ((b (if (region-active-p) (region-beginning) (line-beginning-position)))
(e (if (region-active-p) (region-end) (line-end-position)))
(lines (split-string (buffer-substring-no-properties b e) "\n")))
(save-excursion
(goto-char e)
(dolist (line lines)
(open-line 1)
(forward-line 1)
(insert line)
;; If the COMMENT prefix argument is non-nil, comment the inserted text
(when comment
(comment-region (line-beginning-position) (line-end-position)))))))
(defun cj/remove-duplicate-lines-region-or-buffer ()
"Remove duplicate lines in the region or buffer, keeping the first occurrence.
Operate on the active region when one exists; otherwise operate on the whole buffer."
(interactive)
(let ((start (if (use-region-p) (region-beginning) (point-min)))
(end (if (use-region-p) (region-end) (point-max))))
(save-excursion
(let ((end-marker (copy-marker end)))
(while
(progn
(goto-char start)
(re-search-forward "^\\(.*\\)\n\\(\\(.*\n\\)*\\)\\1\n" end-marker t))
(replace-match "\\1\n\\2"))))))
(defun cj/remove-lines-containing (text)
"Remove all lines containing TEXT.
If region is active, operate only on the region, otherwise on entire buffer.
The operation is undoable."
(interactive "sRemove lines containing: ")
(save-excursion
(save-restriction
(let ((region-active (use-region-p))
(count 0))
(when region-active
(narrow-to-region (region-beginning) (region-end)))
(goto-char (point-min))
;; Count lines before deletion
(while (re-search-forward (regexp-quote text) nil t)
(setq count (1+ count))
(beginning-of-line)
(forward-line))
;; Go back and delete
(goto-char (point-min))
(delete-matching-lines (regexp-quote text))
;; Report what was done
(message "Removed %d line%s containing '%s' from %s"
count
(if (= count 1) "" "s")
text
(if region-active "region" "buffer"))))))
(defun cj/underscore-line ()
"Underline the current line by inserting a row of characters below it.
If the line is empty or contains only whitespace, abort with a message."
(interactive)
(let ((line (buffer-substring-no-properties
(line-beginning-position)
(line-end-position))))
(if (string-match-p "^[[:space:]]*$" line)
(message "Line empty or only whitespace. Aborting.")
(let* ((char (read-char "Enter character for underlining: "))
(len (save-excursion
(goto-char (line-end-position))
(current-column))))
(save-excursion
(end-of-line)
(insert "\n" (make-string len char)))))))
;; Line & paragraph operations prefix and keymap
(define-prefix-command 'cj/line-and-paragraph-map nil
"Keymap for line and paragraph manipulation.")
(define-key cj/custom-keymap "l" 'cj/line-and-paragraph-map)
(define-key cj/line-and-paragraph-map "j" 'cj/join-line-or-region)
(define-key cj/line-and-paragraph-map "J" 'cj/join-paragraph)
(define-key cj/line-and-paragraph-map "d" 'cj/duplicate-line-or-region)
(define-key cj/line-and-paragraph-map "R" 'cj/remove-duplicate-lines-region-or-buffer)
(define-key cj/line-and-paragraph-map "r" 'cj/remove-lines-containing)
(define-key cj/line-and-paragraph-map "u" 'cj/underscore-line)
(provide 'custom-line-paragraph)
;;; custom-line-paragraph.el ends here.
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