Emacs is my main text processor software. I do a lot of things with it: writing this snippet, managing some projects with org-mode and, of course, coding. Emacs is very powerful and the learn curve is sometimes very tough and difficult. But with time you will learn how to use it efficiently.
I found some tips to improve my use of Emacs and I will share them here...
Moving a part of text left or right¶
You want to select a part of text (a region) and move it to the right or to the left, increasing or removing spaces:
- Select the text.
Ctrl-X TABand then use arrows to move the region of text.
Add line numbers (when coding)¶
Add this line to
Add syntax/word checking¶
You can use flycheck which supports more than 50 languages.
apt install elpa-flycheck flycheck-doc
Add this line to
(add-hook 'after-init-hook #'global-flycheck-mode)
Then you need to install a checker program. We will take the example of Python3 with Pylint:
apt install python3-pylint-common
Add this line to
(setq flycheck-python-pylint-executable "python3")
Open a Python3 file and:
Ctrl-C ! v to verify is everything is well
configured. Then, you can use:
Ctrl-c ! nto point to the next error.
Ctrl-c ! pto point to the previous error.
Ctrl-c ! lto display a list of all errors.
Read flycheck manual for more information...
Use copy and paste in Wayland/X11 with emacs-nox¶
emacs-nox (Emacs compiled without X11 support) can't handle X11 commands for accessing X11 clipboard. My main short time solution: use xclip!
- Ensure xclip (the X11
- program) is installed on your computer.
- In Emacs install xclip (the Emacs package) via Packages.el:
M-x package-install RET xclip RET
- Be sure to toggle xclip by default:
(xclip-mode t)at the end of your
Org-mode always visible stars¶
Sometimes, things that could be considered simple simply do not work! I faced a problem under org-mode with stars display. I use the indent mode a lot in org-mode (because it is clearer to read). On a particular configuration (work laptop), stars where always displayed, whatever command or variable was configured (indent mode/hidestars/etc.).
After wasting about an hour, I changed the Emacs theme and voila! In org-mode, hiding the stars is just putting an "invisible" color to the leading stars. In the previous theme, this color was white (on a dark background) and was actually very visible. I just installed zenburn theme (elpa-zenburn under Debian) and configured it to fix my problem.
All you have to do is to choose an org-mode aware Emacs theme.
Recently opened files¶
By default, Emacs can't remember the list of the last opened files.
But there is a module for that, called
recentf. I've put the
following at the end of my
.emacs config file to active it by
;; Activate recentf (recentf-mode 1) ;; Max saved items = 25 (setq recentf-max-menu-items 25) (setq recentf-max-saved-items 25) ;; Ctrl-X Ctrl-r for opening the list of files (global-set-key "\C-x\ \C-r" 'recentf-open-files) ;; Save the list of files every 5 minutes. (run-at-time nil (* 5 60) 'recentf-save-list)
With that configuration, simply use
Ctrl-x Ctrl-r to list recently
opened files, use arrows in the buffer to select a file and press
Enter to open it in Emacs.
It is also available via the menu (F10 -> File -> Open Recent).
Use Firefox as default web browser under Wayland for opening org-mode links¶
You have Firefox and Chromium installed on your system. Firefox is using Wayland environment (with MOZ_ENABLE_WAYLAND variable). Emacs persists to use Chromium. Here is how to fix this...
First, check xdg-settings configuration for web browser:
xdg-settings get default-web-browser
If it is
chromium.desktop, you just have to change it to
firefox.desktop. But there is another problem to deal with: Wayland!
Use the following desktop application file under
[Desktop Entry] Type=Application Name=Firefox Exec=env MOZ_ENABLE_WAYLAND=1 /usr/bin/firefox %u X-MultipleArgs=false Icon=firefox Categories=Network;WebBrowser; Terminal=false MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;
Then, configure the default web browser:
xdg-settings set default-web-browser firefox.desktop
From now, xdg-open will use your local firefox.desktop file rather than the system one. As org-mode uses xdg-open, you are set up!