diff options
Diffstat (limited to '.config')
| -rw-r--r-- | .config/emacs/config.org | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/.config/emacs/config.org b/.config/emacs/config.org index ae97243..c1e0b95 100644 --- a/.config/emacs/config.org +++ b/.config/emacs/config.org @@ -543,7 +543,9 @@ autocompleting code but has other uses too I guess. #+END_SRC -** Mathematics +** Math and Numbers + +*** Calc The built-in emacs calculator ~calc~ is genuinely the best calculator program I have ever used. Annoyingly though, it has a ‘trail’ that is always around. I @@ -555,6 +557,41 @@ don’t like it. #+END_SRC +*** Increment- and Decrement Number at Point + +This is a pretty standard Vim feature that I dearly miss having. + +#+BEGIN_SRC elisp + + (defun mango-increment-number-at-point (&optional arg) + "Increment the number at point by ARG or 1 if ARG is nil. If called + interactively, the universal argument can be used to specify ARG. If the number + at point has leading zeros then the width of the number is preserved." + (interactive "p*") + (save-excursion + (save-match-data + (skip-chars-backward "0123456789") + (when (eq (char-before (point)) ?-) + (goto-char (1- (point)))) + (when (re-search-forward "-?\\([0-9]+\\)" nil t) + (let ((answer (+ (string-to-number (match-string 0) 10) + (or arg 1))) + (width (length (match-string 1)))) + (replace-match + (format + (concat "%0" (int-to-string (if (< answer 0) (1+ width) width)) "d") + answer))))))) + + (defun mango-decrement-number-at-point (&optional arg) + "The same as ‘mango-increment-number-at-point’, but ARG is negated." + (interactive "p*") + (mango-increment-number-at-point (- (or arg 1)))) + + (keymap-global-set "C-c a" #'mango-increment-number-at-point) + (keymap-global-set "C-c x" #'mango-decrement-number-at-point) + +#+END_SRC + ** Programming *** Indentation |