Emacs
Table of Contents
Emacs
Code snippets
General
- Disable
Metabehavior in Emacs for right Option key
Rif.: apple.stackexchange.com
(when (eq system-type 'darwin) (setq mac-right-option-modifier 'none))
- Generic function to get JSON data from a URI
(require 'json) (defun get-json-data (url) (with-current-buffer (url-retrieve-synchronously url) (goto-char (+ 1 url-http-end-of-headers)) (json-read-object)))
- Org 2 Webjump list
Convert a list of bookmarks (expressed in a org document) in a data structure suitable for webjump.
(require 'cl) (defun get-webjump-sites () "converts a org document in a data structure suitable for webjump" (let ((regex "\\[\\[\\(.*\\)\\]\\[\\(.*\\)\\]\\]")) (with-current-buffer (get-file-buffer "~/Dropbox/stefanorodighiero.net/links.org") (loop for i in (org-map-entries 'org-entry-properties nil 'file) for item-string = (cdr (assoc "ITEM" i)) if (string-match regex item-string) collect `(,(match-string 2 item-string) . ,(match-string 1 item-string))))))
Elfeed
Download the image under the cursor
(defun shr-download-image () "Downloads the image under point" (interactive) (let ((url (get-text-property (point) 'image-url))) (if (not url) (message "No image under point!") (url-copy-file url (expand-file-name (url-file-nondirectory url) "~/Pictures/elfeed/"))))) (define-key elfeed-show-mode-map "D" #'shr-download-image)
Helm
An example of a custom-made Helm menu based on current buffer contents
(defun helm-subroutines () (interactive) (helm :sources '(((name . "Perl subroutines") (volatile) (headline "^sub ")))))
Switch theme
Disables all enabled themes before activating the new one:
(defun switch-theme (theme) (interactive (list (intern (completing-read "Switch to custom theme: " (mapcar 'symbol-name (custom-available-themes)))))) (dolist (curr custom-enabled-themes) (disable-theme curr)) (load-theme theme))
Increase text size
Increase text size for all the existing buffers matching a certain major-mode.
(defun increase-text-scale-in-buffer-group (major-mode-name) "Increment text scale for all buffers matching a give major mode name" (interactive (list (intern (completing-read "Select major mode from the list: " (remove-duplicates (mapcar (lambda (b) (buffer-local-value 'major-mode (get-buffer b))) (buffer-list))))))) (cl-loop for buffer in (buffer-list) when (string= (buffer-local-value 'major-mode (get-buffer buffer)) major-mode-name) do (with-current-buffer buffer (text-scale-increase 1))))
Create thumbnail
(defun create-thumbnail (filename) (let* ((dir (file-name-directory filename)) (basename (file-name-base filename)) (extension (downcase (file-name-extension filename))) (thumb-filename (concat dir basename "-thumb." extension))) (call-process "convert" nil nil nil "-resize" "25%" filename thumb-filename) thumb-filename))
Clone indirect buffer in another frame
Rif.: Superuser
(global-set-key [?\C-x ?5 ?c]
'(lambda(newname display-flag)
"Like `clone-indirect-buffer-other-window' but display in another frame."
(interactive
(progn
(if (get major-mode 'no-clone-indirect)
(error "Cannot indirectly clone a buffer in %s mode" mode-name))
(list (if current-prefix-arg
(read-buffer "Name of indirect buffer: " (current-buffer))) t)))
(save-window-excursion
(let ((newbuf (clone-indirect-buffer newname display-flag)))
(switch-to-buffer-other-frame newbuf)))))
Dired
Rif.: Emacswiki
(setq dired-dwim-target t)
org-babel: create a SQLite DB based on a table
In a sqlite src block:
#+begin_src sqlite :db /tmp/test.db :var orgtable=log :colnames yes drop table if exists sleep; create table sleep (day text, up text, in_bed text); .mode csv sleep .import $orgtable sleep #+end_src
Keys and commands
General
| Key sequence | Command | Elisp function |
|---|---|---|
C-x r t |
Rectangle: prefix | |
C-c C-x C-v |
Toggle inline image mode | |
M-g M-g |
Goto line… | |
C-u C-x C-e |
Eval and insert output at point | |
M-0 C-k |
Kill and yank backwards | |
C-s C-w |
Appends the rest of the word under the cursor to the search pattern | |
C-fx C-m f |
Set the file coding-system of the current buffer |
Dired
| Key sequence | Command | Elisp function |
|---|---|---|
+ |
Create directory | |
m/u |
Mark/Unmark for deletion | |
| Q | Search&replace on marked files | |
C-x C-q |
Edit mode | |
C-c C-c |
(in edit mode) Apply changes | |
C-c C-k |
(in edit mode) Cancel | |
# |
Flag all auto-save files (files whose names start and end with ‘#’) for deletion | |
~ |
Flag all backup files (files whose names end with ‘~’) for deletion | |
% & |
Flag for deletion all files with certain kinds of names which suggest you could easily create those files again. |
Org-mode
| Key sequence | Command | Elisp function |
|---|---|---|
C-c c |
Capture | |
C-c C-w |
Refile | (org-refile) |
C-c C-t |
Toggle state | |
C-c C-d |
Add deadline | |
C-c / |
Sparse tree | (org-sparse-tree) |
C-c C-x b |
Show the current subtree in an indirect buffer | (org-tree-to-indirect-buffer) |
Markdown mode
| Key sequence | Command | Elisp function |
|---|---|---|
C-c C-s b |
Insert blockquote | (markdown-insert-blockquote) |
C-c C-c p |
Preview |
eww
| Key sequence | Command | Elisp function |
|---|---|---|
H |
Show browsing history | |
l |
(eww-back-url) |
|
w |
Copy current page URL | (eww-copy-page-url) |
Helm
| Key sequence | Command | Elisp function |
|---|---|---|
C-x c C-x C-f |
(helm-find-files) |
|
C-Space |
Mark buffers in helm-mini | |
| M-S-d | Delete marked buffers in helm-mini |
SLIME
Key bindings
| Key sequence | Command | Elisp function |
|---|---|---|
C-M-i |
Complete symbol | |
C-M-x |
Evaluate the current toplevel form | slime-eval-defun |
<Leader> !p |
Change package |
<Leader> is comma (,).
Snippets
This comes from #lisp IRC channel: "when you are in a slime repl window, slime-process
will return that instance process", so
(switch-to-buffer (process-buffer
(slime-process)))