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Diffstat (limited to 'users/glittershark/emacs.d/utils.el')
-rw-r--r-- | users/glittershark/emacs.d/utils.el | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/users/glittershark/emacs.d/utils.el b/users/glittershark/emacs.d/utils.el new file mode 100644 index 000000000000..d6d1d5722b5f --- /dev/null +++ b/users/glittershark/emacs.d/utils.el @@ -0,0 +1,92 @@ +;;; private/grfn/utils.el -*- lexical-binding: t; -*- + + +;; Elisp Extras + +(defmacro comment (&rest _body) + "Comment out one or more s-expressions" + nil) + +(defun inc (x) "Returns x + 1" (+ 1 x)) +(defun dec (x) "Returns x - 1" (- x 1)) + + +;; +;; Text editing utils +;; + +;; Reading strings + +(defun get-char (&optional point) + "Get the character at the given `point' (defaulting to the current point), +without properties" + (let ((point (or point (point)))) + (buffer-substring-no-properties point (+ 1 point)))) + +(defun get-line (&optional lineno) + "Read the line number `lineno', or the current line if `lineno' is nil, and +return it as a string stripped of all text properties" + (let ((current-line (line-number-at-pos))) + (if (or (not lineno) + (= current-line lineno)) + (thing-at-point 'line t) + (save-mark-and-excursion + (line-move (- lineno (line-number-at-pos))) + (thing-at-point 'line t))))) + +(defun get-line-point () + "Get the position in the current line of the point" + (- (point) (line-beginning-position))) + +;; Moving in the file + +(defun goto-line-char (pt) + "Moves the point to the given position expressed as an offset from the start +of the line" + (goto-char (+ (line-beginning-position) pt))) + +(defun goto-eol () + "Moves to the end of the current line" + (goto-char (line-end-position))) + +(defun goto-regex-on-line (regex) + "Moves the point to the first occurrence of `regex' on the current line. +Returns nil if the regex did not match, non-nil otherwise" + (when-let ((current-line (get-line)) + (line-char (string-match regex current-line))) + (goto-line-char line-char))) + +(defun goto-regex-on-line-r (regex) + "Moves the point to the *last* occurrence of `regex' on the current line. +Returns nil if the regex did not match, non-nil otherwise" + (when-let ((current-line (get-line)) + (modified-regex (concat ".*\\(" regex "\\)")) + (_ (string-match modified-regex current-line)) + (match-start (match-beginning 1))) + (goto-line-char match-start))) + +(comment + (progn + (string-match (rx (and (zero-or-more anything) + (group "foo" "foo"))) + "foofoofoo") + (match-beginning 1))) + +;; Changing file contents + +(defun delete-line () + "Remove the line at the current point" + (delete-region (line-beginning-position) + (inc (line-end-position)))) + +(defmacro modify-then-indent (&rest body) + "Modify text in the buffer according to body, then re-indent from where the + cursor started to where the cursor ended up, then return the cursor to where + it started." + `(let ((beg (line-beginning-position)) + (orig-line-char (- (point) (line-beginning-position)))) + (atomic-change-group + (save-mark-and-excursion + ,@body + (evil-indent beg (+ (line-end-position) 1)))) + (goto-line-char orig-line-char))) |