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+;;; editing.el --- Text editing commands -*- lexical-binding: t; -*-
+
+(defun e/align-regexp (regexp repeat)
+ "Align the marked region on REGEXP.
+When called interactively REGEXP is read from the minibuffer and the
+user is prompted about whether they would like to REPEAT the alignment.
+nn
+This function wraps `align-regexp' and implicitly prepends REGEXP with
+\"\\(\\s-*\\)\"."
+ (interactive
+ (list (concat "\\(\\s-*\\)"
+ (read-string
+ (format-prompt "Align regexp" nil)))
+ (y-or-n-p "Repeat?")))
+ (let ((start (min (mark) (point)))
+ (end (max (mark) (point))))
+ (align-regexp start end regexp 1 1 repeat)))
+
+(defun e/join-current-and-next-line ()
+ "Join the current- and next lines.
+Join the next line after point to the line point is currently on. This
+is in effect the reverse of `join-line'."
+ (interactive)
+ (delete-indentation 1))
+
+(defun e/transpose-previous-chars ()
+ "Transpose the two characters preceeding point.
+This command is similar to `transpose-chars' except it transposes the
+two characters that preceed the point instead of the characters that
+surround it."
+ (interactive)
+ (save-excursion
+ (backward-char)
+ (transpose-chars 1)))
+
+(defun e/transpose-current-and-next-lines ()
+ "Transpose the current and next lines.
+This command is similar to `transpose-lines' except it transposes the
+current and next lines instead of the current and previous lines. This
+maintains symmetry with `transpose-words'."
+ (interactive)
+ (let ((column (current-column)))
+ (forward-line)
+ (transpose-lines 1)
+ (forward-line -1)
+ (indent-region (pos-bol) (pos-eol))
+ (move-to-column column)))
+
+(defun e/mark-entire-word (&optional arg allow-extend)
+ "Mark ARG words beginning at point.
+This command is a wrapper around `mark-word' that moves the point such
+that the word under point is entirely marked. ARG and ALLOW-EXTEND are
+just as they are with `mark-word.'"
+ (interactive "P\np")
+ (if (eq last-command this-command)
+ (mark-word arg allow-extend)
+ (let ((bounds (bounds-of-thing-at-point 'word))
+ (numeric-arg allow-extend))
+ (if bounds
+ (goto-char (if (< numeric-arg 0)
+ (cdr bounds)
+ (car bounds)))
+ (forward-to-word (when (< numeric-arg 0) -1))))
+ (mark-word arg allow-extend)))
+
+(defun e/mark-entire-sexp (&optional arg allow-extend)
+ "Mark ARG sexps beginning at point.
+This command is a wrapper around `mark-sexp' that moves the point such
+that the sexp under point is entirely marked. ARG and ALLOW-EXTEND are
+just as they are with `mark-sexp.'"
+ (interactive "P\np")
+ (if (eq last-command this-command)
+ (mark-sexp arg allow-extend)
+ (let ((bounds (bounds-of-thing-at-point 'sexp))
+ (numeric-arg allow-extend))
+ (if bounds
+ (goto-char (if (< numeric-arg 0)
+ (cdr bounds)
+ (car bounds)))
+ (if (< numeric-arg 0)
+ (progn
+ (backward-sexp)
+ (forward-sexp))
+ (forward-sexp)
+ (backward-sexp))))
+ (mark-sexp arg allow-extend)))
+
+(defun e/mark-line-dwim (&optional arg)
+ "Mark ARG lines beginning at point.
+If the region is active then it is extended by ARG lines. If called
+without a prefix argument this command marks one line forwards unless
+point is ahead of the mark in which case this command marks one line
+backwards.
+
+If this function is called with a negative prefix argument and no region
+active, the current line is marked."
+ (interactive "P")
+ (let ((numeric-arg (prefix-numeric-value arg)))
+ (if (region-active-p)
+ (progn
+ (exchange-point-and-mark)
+ (goto-char (1+ (pos-eol (if arg numeric-arg
+ (when (< (point) (mark)) -1)))))
+ (exchange-point-and-mark))
+ (if (< numeric-arg 0)
+ (progn
+ (push-mark (pos-bol (+ 2 numeric-arg)) nil :activate)
+ (goto-char (1+ (pos-eol))))
+ (push-mark (1+ (pos-eol numeric-arg)) nil :activate)
+ (goto-char (pos-bol))))))
+
+(defun e/kill-ring-save-dwim ()
+ "Save the region as if killed, but don't kill it.
+This function is the same as `kill-ring-save' in Transient Mark mode,
+but when there is no active region it saves the line at point to the kill
+ring excluding any potential trailing newline."
+ (interactive)
+ (if (region-active-p)
+ (kill-ring-save -1 -1 :region)
+ (kill-ring-save (pos-bol) (pos-eol))))
+
+(defun e/scroll-down ()
+ "Scroll down one page.
+This function is identical to `cua-scroll-down' except it recenters the
+screeen after scrolling. If the user scrolls to the top of the document
+then no recentering occurs."
+ (interactive)
+ (let ((line-number (line-number-at-pos)))
+ (cua-scroll-down)
+ (when (= line-number (line-number-at-pos))
+ (goto-char (point-min)))
+ (recenter)))
+
+(defun e/scroll-up ()
+ "Scroll up one page.
+This function is identical to `cua-scroll-up' except it recenters the
+screen after scrolling."
+ (interactive)
+ (mm-do-and-center #'cua-scroll-up))
+
+(provide 'editing)