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Emacs Configuration

Personal Information
Update config in a running config
Customize settings
Theme
- Material Theme
Sane defaults
List buffers
Recentf
Org Mode
which-key

Personal Information

 (setq user-full-name "Marc Pohling"
       user-mail-address "marc.pohling@googlemail.com")

Update config in a running config

Two options:

reload the open file: M-x load-file, then press twice to accept the default filename, which is the currently opened
Point at the end of any sexp and press C-x C-e

Customize settings

Move the customize settings to its own file, instead of saving customize settings in init.el.

 (setq custom-file (expand-file-name "custom.el" user-emacs-directory))
 (load custom-file)

Theme

Material Theme

The Material Theme comes in a dark and a light variant. Not too dark to be strenious though.

 (use-package material-theme
     :if (window-system)
     :defer t
     :ensure t
     :init
     (load-theme 'material t)
 )

Sane defaults

Sources for this section include Magnars Sveen and Sacha Chua

These functions are useful. Activate them.

 (put 'downcase-region 'disabled nil)
 (put 'upcase-region 'disabled nil)
 (put 'narrow-to-region 'disabled nil)
 (put 'dired-find-alternate-file 'disabled nil)

Answering just 'y' or 'n' should be enough.

 (defalias 'yes-or-no-p 'y-or-n-p)

Keep all backup and auto-save files in one directory

 (setq backup-directory-alist '(("." . "~/.emacs.d/backups")))
 (setq auto-save-file-name-transforms '((".*" "~/.emacs.d/auto-save-list/" t)))

UTF-8 please

 (setq locale-coding-system 'utf-8)
 (set-terminal-coding-system 'utf-8)
 (set-keyboard-coding-system 'utf-8)
 (set-selection-coding-system 'utf-8)
 (prefer-coding-system 'utf-8)

Avoid tabs in place of multiple spaces (they look bad in TeX) and show empty lines

 (setq-default indent-tabs-mode nil)
 (setq-default indicate-empty-lines t)

Turn off blinking cursor

 (blink-cursor-mode -1)

Don't count two spaces after a period as the end of a sentence. Just one space is needed

 (setq sentence-end-double-space nil)

Delete the region when typing, just like as we expect nowadays.

 (delete-selection-mode t)

Various stuff

 (show-paren-mode t)
 (column-number-mode t)

 (global-visual-line-mode)
 (diminish 'visual-line-mode)
 
 (setq uniquify-buffer-name-style 'forward)

List buffers

Ibuffer is the improved version of list-buffers. Make ibuffer the default buffer lister. Source

 (defalias 'list-buffers 'ibuffer)

Also auto refresh dired, but be quiet about it. Source

 (add-hook 'dired-mode-hook 'auto-revert-mode)
 (setq global-auto-revert-non-file-buffers t)
 (setq auto-revert-verbose nil)

Recentf

 (use-package recentf
     :bind ("C-x C-r" . helm-recentf)
     :config
     (recentf-mode t)
     (setq recentf-max-saved-items 200)
 )

Org Mode

Installation

Although org mode ships with Emacs, the latest version can be installed externally. The configuration here follows the Org mode ELPA Installation instructions.

 (use-package org
     :ensure org-plus-contrib)

To avoid problems executing source blocks out of the box. Others have the same problem, too. The solution is to remove the .elc files form the package directory:

 rm ${ORG_DIR}/*.elc

Org activation bindings

Set up some global key bindings that integrate with Org mode features

 (bind-key "C-c l" 'org-store-link)
 (bind-key "C-c c" 'org-capture)
 (bind-key "C-c a" 'org-agenda)

Org agenda

For a more detailed example see here.

 (setq org-agenda-files
     (delq nil
         (mapcar (lambda (x) (and (file-exists-p x) x))
                 '("~/Archiv/Dokumente/Agenda"))
     )
 )

Org capture

 (bind-key "C-c c" 'org-capture)
 (setq org-default-notes-file "~/Archiv/Dokumente/Notizen/notes.org")

Org Setup

Speed commands are a nice and quick way to perform certain actions while at the beginning of a heading. It's not activated by default.

See the doc for speed keys by checking out the documentation for speed keys in Org mode.

 (setq org-use-speed-commands t)
 (setq org-image-actual-width 550)
 (setq org-highlight-latex-and-related '(latex script entities))

Org tags

The default value is -77, which is weird for smaller width windows. I'd rather have the tags align horizontally with the header. 45 is a good column number to do that.

 (setq org-tags-column 45)

Org babel languages

 (org-babel-do-load-languages
  'org-babel-load-languages
  '((python . t)
    (C . t)
    (calc . t)
    (latex . t)
    (java . t)
    (ruby . t)
    (lisp . t)
    (scheme . t)
    (shell . t)
    (sqlite . t)
    (js . t)))

 (defun my-org-confirm-babel-evaluate (lang body)
     "Do not confirm evaluation for these languages."
     (not (or (string= lang "C")
              (string= lang "java")
              (string= lang "python")
              (string= lang "emacs-lisp")
              (string= lang "sqlite"))))
 (setq org-confirm-babel-evaluate 'my-org-confirm-babel-evaluate)

Org babel/source blocks

I like to have source blocks properly syntax highlighted and with the editing popup window staying within the same window so all the windows don't jump around. Also, having the top and bottom trailing lines in the block is a waste of space, so we can remove them

I noticed that fontification doesn't work with markdown mode when the block is indented after editing it in the org src buffer - the leading #s for headers don't get fontified properly because they apppear as Org comments. Setting org-src-preserve-identation makes things consistent as it doesn't pad source blocks with leading spaces

 (setq org-src-fontify-natively t
       org-src-window-setup 'current-window
       org-src-strip-leading-and-trailing-blank-lines t
       org-src-preserve-indentation t
       org-src-tab-acts-natively t)

which-key

Greatly increases discovery of functions! Click here for source and more info. Info in Emacs: M-x customize-group which-key

 (use-package which-key
     :ensure t
     :diminish which-key-mode
     :config
     (which-key-mode)
     (which-key-setup-side-window-right-bottom)
     (which-key-setup-minibuffer)
     (setq which-key-idle-delay 0.5)
 )

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