#+TITLE: luxicks Emacs Configuration
This is my configuration for the emacs editor.

Points of intrest:
- Personal information (name, email) are stored in a separate ~personal.el~ file.
- Machine specific settings are stored in a separate ~custom.el~ file.
- Both files are loaded automatically.
- When Exporting HTML from ~org-mode~ the style from the ~org-theme.css~ file is inlined automatically.
* Set up UI
Remove all those UI elements. They do not look good and waste space.
#+BEGIN_SRC emacs-lisp
  (tool-bar-mode -1)
  (menu-bar-mode -1)
  (scroll-bar-mode -1)
  (tooltip-mode -1)
  (fringe-mode -1)
#+END_SRC
* Set up package repositories
** Require package support
State that we will need package support and define a macro for adding package repos to the archives
#+BEGIN_SRC emacs-lisp
     (require 'package)
     (defmacro append-to-list (target suffix)
      "Append SUFFIX to TARGET in place."
      `(setq ,target (append ,target ,suffix)))
#+END_SRC

** Add package repos
#+BEGIN_SRC emacs-lisp
     (append-to-list package-archives
                     '(("melpa" . "http://melpa.org/packages/")
                       ("org-elpa" . "https://orgmode.org/elpa/")))
#+END_SRC

** Ensure ~use-package~ command is present
#+BEGIN_SRC emacs-lisp
  (package-initialize)

  (unless (package-installed-p 'use-package)
    (package-refresh-contents)
    (package-install 'use-package))

  (require 'use-package)

  (setq use-package-always-ensure t)

  (use-package gnu-elpa-keyring-update)
#+END_SRC

* Set Backup Location
Emacs, by default clutters the file system with backup files.
We do not want them to be right next to the actual file, so we tell emacs to use dedicated directory to store them.
While we are at it, we also set rule for how many version emacs should keep as backups.
#+BEGIN_SRC emacs-lisp
    (setq backup-directory-alist `(("." . "~/.emacs-backup")))
    (setq backup-by-copying t)
    (setq delete-old-versions t
      kept-new-versions 6
      kept-old-versions 2
      version-control t)
#+END_SRC

* Define useful functions
** Edit the config file
A simple funtion to open this file for quick editing.
#+BEGIN_SRC emacs-lisp
     (defun edit-config ()
       (interactive)
       (find-file "~/.emacs.d/README.org"))
#+END_SRC
** Reformat a whole buffer
Reindet the whole buffer with ~F12~
#+BEGIN_SRC emacs-lisp
     (defun indent-buffer ()
           (interactive)
           (save-excursion
             (indent-region (point-min) (point-max) nil)))
         (global-set-key [f12] 'indent-buffer)
#+END_SRC
** Split windows and  immediately switch to it
#+BEGIN_SRC emacs-lisp
     (defun split-right-and-enter ()
       "Split the window to the right and enter it."
       (interactive)
       (split-window-right)
       (other-window 1))

     (defun split-below-and-enter ()
       "Split the window down and enter it."
       (interactive)
       (split-window-below)
       (other-window 1))
#+END_SRC
** Quick buffer switching
#+BEGIN_SRC emacs-lisp
     (defun switch-to-previous-buffer ()
       "Switch to previously open buffer.  Repeated invocations toggle between the two most recently open buffers."
       (interactive)
       (switch-to-buffer (other-buffer (current-buffer) 1)))
#+END_SRC
** Fold all except the current heading
With this all other subtrees in the buffer van be collapsed, leaving only the subtree at the point expanded
#+BEGIN_SRC emacs-lisp
  (defun org-show-current-heading-tidily ()
    (interactive)  ;Inteactive
    "Show next entry, keeping other entries closed."
    (if (save-excursion (end-of-line) (outline-invisible-p))
        (progn (org-show-entry) (show-children))
      (outline-back-to-heading)
      (unless (and (bolp) (org-on-heading-p))
        (org-up-heading-safe)
        (hide-subtree)
        (error "Boundary reached"))
      (org-overview)
      (org-reveal t)
      (org-show-entry)
      (show-children)))
#+END_SRC

And it should be accessible with a quick keystroke:
#+BEGIN_SRC emacs-lisp
  (global-set-key "\M-s" 'org-show-current-heading-tidily)
#+END_SRC

* Theming
Apply a nice looking theme.

#+BEGIN_SRC emacs-lisp
  ;; Light Theme
  (use-package modus-operandi-theme)
  (load-theme 'modus-operandi t)

  ;; Syntax highlighing
  (setq modus-operandi-theme-faint-syntax t)

  (setq modus-operandi-theme-org-blocks "greyscale")

  (setq default-frame-alist
        (append (list '(width  . 90) '(height . 50)
                      '(vertical-scroll-bars . nil)
                      '(internal-border-width . 10)
                      '(font . "Roboto Mono Light 10"))))
#+END_SRC
Use a nice looking modeline package

#+BEGIN_SRC emacs-lisp
  (use-package telephone-line)
  (telephone-line-mode 1)
#+END_SRC
* Ivy
Use Ivy to make minibuf promts better. Adds the ability to sort and filter.
** Use Ivy
#+BEGIN_SRC emacs-lisp
  (use-package ivy
    :diminish
    :init
    (ivy-mode 1)
    (unbind-key "S-SPC" ivy-minibuffer-map)
    (setq ivy-height 30
          ivy-use-virtual-buffers t
          ivy-use-selectable-prompt t)
    :bind (("C-x b"   . ivy-switch-buffer)
           ("C-c C-r" . ivy-resume)
           ("C-s"     . swiper)))

  ;; ivy-rich makes Ivy look a little bit more like Helm.
  (use-package ivy-rich
    :after counsel
    :custom
    (ivy-virtual-abbreviate 'full
                            ivy-rich-switch-buffer-align-virtual-buffer t
                            ivy-rich-path-style 'abbrev)
    :init
    (ivy-rich-mode))

  (use-package ivy-hydra)
#+END_SRC

** Smex
Sort commands by recency in ivy windows
#+BEGIN_SRC emacs-lisp
  (use-package smex)
#+END_SRC

* Counsel
#+BEGIN_SRC emacs-lisp
  (use-package counsel
    :after ivy
    :init (counsel-mode 1)
    :bind (("C-c ;" . counsel-M-x)
           ("C-c U" . counsel-unicode-char)
           ("C-c i" . counsel-imenu)
           ("C-x f" . counsel-find-file)
           ("C-c y" . counsel-yank-pop)
           ("C-c r" . counsel-recentf)
           :map ivy-minibuffer-map
           ("C-r" . counsel-minibuffer-history))
    :diminish)
#+END_SRC

* Magit
Magit is THE go to package for using git in emacs.
#+BEGIN_SRC emacs-lisp
    (use-package magit
      :bind (("C-c g" . magit-status))
      :diminish magit-auto-revert-mode
      :diminish auto-revert-mode
      :custom
      (magit-remote-set-if-missing t)
      (magit-diff-refine-hunk t)
      :config
      (magit-auto-revert-mode t)
      (advice-add 'magit-refresh :before #'maybe-unset-buffer-modified)
      (advice-add 'magit-commit  :before #'maybe-unset-buffer-modified)
      (setq magit-completing-read-function 'ivy-completing-read)
      (add-to-list 'magit-no-confirm 'stage-all-changes))

    (use-package libgit
      :disabled
      :after magit)
#+END_SRC
The ~advice-add~ entries are thereto stop magit from bugging us to save buffers when commiting and refreshing.

** Helper Functions
#+BEGIN_SRC emacs-lisp
     (autoload 'diff-no-select "diff")
     (defun current-buffer-matches-file-p ()
       "Return t if the current buffer is identical to its associated file."
       (when (and buffer-file-name (buffer-modified-p))
         (diff-no-select buffer-file-name (current-buffer) nil 'noasync)
         (with-current-buffer "*Diff*"
           (and (search-forward-regexp "^Diff finished \(no differences\)\." (point-max) 'noerror) t))))
#+END_SRC

Clear modified bit on all unmodified buffers
#+BEGIN_SRC emacs-lisp
     (defun maybe-unset-buffer-modified (&optional _)
       (interactive)
       (dolist (buf (buffer-list))
         (with-current-buffer buf
           (when (and buffer-file-name (buffer-modified-p) (current-buffer-matches-file-p))
             (set-buffer-modified-p nil)))))

#+END_SRC

Don't prompt to save unmodified buffers on exit.
#+BEGIN_SRC emacs-lisp
     (advice-add 'save-buffers-kill-emacs :before #'maybe-unset-buffer-modified)
#+END_SRC

#+BEGIN_SRC emacs-lisp
     (defun kill-buffer-with-prejudice (&optional _)
       "Kill a buffer, eliding the save dialogue if there are no diffs."
       (interactive)
       (when (current-buffer-matches-file-p) (set-buffer-modified-p nil))
       (kill-buffer))
#+END_SRC

* Org Mode
** Define important files
*** The Link Dump
I use a single file to dump all links I plan on viewing later.
#+BEGIN_SRC emacs-lisp
  (defvar link-dump "")

  (defun open-link-dump ()
    (interactive)
    (find-file link-dump))
#+END_SRC
** Configure org-mode
This is the main configuration for the infamous org-mode.
The most important parts are configuring key bindings to quickly access the files we have defined above.
#+BEGIN_SRC emacs-lisp
  (use-package org
    ;; Always get this from the GNU archive.
    :pin gnu
    :bind (("C-c o c"  . org-capture)
           ("C-c o l"  . open-link-dump)
           ("C-c o s"  . org-store-link)
           ("C-c o a"  . org-agenda)
           :map org-mode-map
           ("M-s-<return>" . org-insert-todo-heading)
           ("M-<return>" . org-insert-heading-respect-content)
           ("C-c c"    . org-mode-insert-code)
           ("C-c a s"  . org-emphasize)
           ("C-c a r"  . org-ref)
           ("C-c a e"  . outline-show-all)
           ("C-c a t"  . unindent-by-four)
           ("C-c -"    . org-edit-special))
    :hook ((org-mode . visual-line-mode)
           (org-mode . variable-pitch-mode)
           (org-mode . org-indent-mode))
    :config
    (let ((todo-path (expand-file-name "~/Notes/todo.org")))
      (when (file-exists-p todo-path)
        (setq org-agenda-files (list todo-path)
              org-default-notes-file todo-path)))

    (setq org-footnote-section ""
          org-startup-with-inline-images t
          org-pretty-entities t
          org-indent-mode t
          org-footnote-section nil
          org-hide-leading-stars nil
          org-link-file-path-type 'relative
          org-image-actual-width nil           ; with this image sizes can be set per image, with an attribute
          org-display-inline-images t
          )
    (setcar (nthcdr 4 org-emphasis-regexp-components) 4)

    (defun org-mode-insert-code ()
      (interactive)
      (org-emphasize ?~)))
#+END_SRC

** Set default archive location
When archiving items in org files, the default ist to crate a separate file named ~<filename>.org_archive~.
This clutters up my notes folder quite a bit, as I use a lot of separate files with thier respective archives.
All archives should be stored in a single  ~.archive~ file per directory.
#+BEGIN_SRC emacs-lisp
  (setq org-archive-location "./.archive::* From %s")
#+END_SRC
** Beautify org-mode
*** Icons
#+BEGIN_SRC emacs-lisp
  (use-package org-bullets
    :init (add-hook 'org-mode-hook (lambda () (org-bullets-mode 1))))

  (setq org-bullets-bullet-list '("◉" "○" "◆" "✿" "✚" "▶"))
#+END_SRC

Ellipsis icon:
#+BEGIN_SRC emacs-lisp
  (setq org-ellipsis "▾")
#+END_SRC

Nice Icons for lists:
#+BEGIN_SRC emacs-lisp
  (add-hook 'org-mode-hook
            (lambda ()
              "Beautify Org Checkbox Symbol"
              (push '("[ ]" . "☐") prettify-symbols-alist)
              (push '("[X]" . "☑" ) prettify-symbols-alist)
              (push '("[-]" . "❍" ) prettify-symbols-alist)
              (prettify-symbols-mode)))
#+END_SRC

We also want them in exported HTML files
#+BEGIN_SRC emacs-lisp
  (setq org-html-checkbox-type 'html)
#+END_SRC

*** Strike out done ckeckbox items
#+BEGIN_SRC emacs-lisp
      (defface org-checkbox-done-text
        '((t (:foreground "#71696A" :strike-through t)))
        "Face for the text part of a checked org-mode checkbox.")

      (font-lock-add-keywords
       'org-mode
       `(("^[ \t]*\\(?:[-+*]\\|[0-9]+[).]\\)[ \t]+\\(\\(?:\\[@\\(?:start:\\)?[0-9]+\\][ \t]*\\)?\\[\\(?:X\\|\\([0-9]+\\)/\\2\\)\\][^\n]*\n\\)"
          1 'org-checkbox-done-text prepend))
       'append)
#+END_SRC

*** Replace dash in bullet lists with unicode symbol
#+BEGIN_SRC emacs-lisp
  (font-lock-add-keywords 'org-mode
                          '(("^ *\\([-]\\) "
                             (0 (prog1 () (compose-region (match-beginning 1) (match-end 1) "•"))))))
#+END_SRC

*** Prettier Timestamps in Exports
#+BEGIN_SRC emacs-lisp
     (setq-default org-display-custom-times t)
     (setq org-time-stamp-custom-formats
           '("<%a %d.%m.%Y>" . "<%d.%m.%y %H:%M>"))
#+END_SRC
** Templates
*** Babel
Here we set custom templates to be used for structure expansion.
These are used when we type "<" folowed by the shortcut for a template and hit "TAB".
e.g. "<s TAB" expands to ~#+BEGIN_SRC ?\n\n#+END_SRC~

Use ~org-tempo~ to quickly insert the structures
#+begin_src emacs-lisp
  (require 'org-tempo)
#+end_src
**** emacs-lisp
Shortcut for creating ~emacs-lisp~ code blocks. This is used extensively in this very file.
#+BEGIN_SRC emacs-lisp
  (add-to-list 'org-structure-template-alist '("el" . "src emacs-lisp"))
#+END_SRC
*** Capture Support Functions
First we define a function to look the subheading under which we want to file captures:
#+BEGIN_SRC emacs-lisp
  (defun org-get-target-headline (&optional targets prompt)
    "Prompt for a location in an org file and jump to it.

  This is for promping for refile targets when doing captures.
  Targets are selected from `org-refile-targets'. If TARGETS is
  given it temporarily overrides `org-refile-targets'. PROMPT will
  replace the default prompt message.

  If CAPTURE-LOC is is given, capture to that location instead of
  prompting."
    (let ((org-refile-targets (or targets org-refile-targets))
          (prompt (or prompt "Capture Location")))
      (org-refile t nil nil prompt))
    )
#+END_SRC

*** Org Capture
Here we define templates we want to use to quickly capture stuff and automatically file them away.
#+BEGIN_SRC emacs-lisp
  (setq org-capture-templates
        '(("l" "Link" entry (file link-dump)
           "* NEW %?\n:PROPERTIES:\n:CREATED: %U\n:END:\n%i\n")
          ))
#+END_SRC

** CSS inlining
Auto inline a CSS theme for org HTML exports.
This will make sure a self contained single HTML file is created.

#+BEGIN_SRC emacs-lisp
  (defun my-org-inline-css-hook (exporter)
    "Insert custom inline css"
    (when (eq exporter 'html)
      (let* ((dir (ignore-errors (file-name-directory (buffer-file-name))))
             (path (concat dir "style.css"))
             (homestyle (or (null dir) (null (file-exists-p path))))
             (final (if homestyle "~/.emacs.d/org-theme.css" path))) ;; <- set your own style file path
        (setq org-html-head-include-default-style nil)
        (setq org-html-head (concat
                             "<style type=\"text/css\">\n"
                             "<!--/*--><![CDATA[/*><!--*/\n"
                             (with-temp-buffer
                               (insert-file-contents final)
                               (buffer-string))
                             "/*]]>*/-->\n"
                             "</style>\n")))))

  (add-hook 'org-export-before-processing-hook 'my-org-inline-css-hook)
#+END_SRC
** Export to a subdirectory
This snippet will create a sub dir for exports from org-mode.
[[https://stackoverflow.com/questions/9559753/emacs-org-mode-export-to-another-directory][See the Stackoverflow question]]

#+BEGIN_SRC emacs-lisp
  (defun org-export-output-file-name-modified (orig-fun extension &optional subtreep pub-dir)
    (unless pub-dir
      (setq pub-dir "Exports")
      (unless (file-directory-p pub-dir)
        (make-directory pub-dir)))
    (apply orig-fun extension subtreep pub-dir nil))
  (advice-add 'org-export-output-file-name :around #'org-export-output-file-name-modified)
#+END_SRC
* Treemacs
Treemacs makes navigating folders and files much easier. This is the default config from [[https://github.com/Alexander-Miller/treemacs][the offical repository]] as a base, with slight modifications to suite my config.

#+BEGIN_SRC emacs-lisp
    (use-package treemacs
      :defer t
      :init
      (with-eval-after-load 'winum
        (define-key winum-keymap (kbd "M-0") #'treemacs-select-window))
      :config
      (progn
        (setq treemacs-collapse-dirs                 (if treemacs-python-executable 3 0)
              treemacs-deferred-git-apply-delay      0.5
              treemacs-display-in-side-window        t
              treemacs-eldoc-display                 t
              treemacs-file-event-delay              5000
              treemacs-file-follow-delay             0.2
              treemacs-follow-after-init             t
              treemacs-git-command-pipe              ""
              treemacs-goto-tag-strategy             'refetch-index
              treemacs-indentation                   2
              treemacs-indentation-string            " "
              treemacs-is-never-other-window         nil
              treemacs-max-git-entries               5000
              treemacs-missing-project-action        'ask
              treemacs-no-png-images                 nil
              treemacs-no-delete-other-windows       t
              treemacs-project-follow-cleanup        nil
              treemacs-persist-file                  (expand-file-name ".cache/treemacs-persist" user-emacs-directory)
              treemacs-position                      'left
              treemacs-recenter-distance             0.1
              treemacs-recenter-after-file-follow    nil
              treemacs-recenter-after-tag-follow     nil
              treemacs-recenter-after-project-jump   'always
              treemacs-recenter-after-project-expand 'on-distance
              treemacs-show-cursor                   nil
              treemacs-show-hidden-files             t
              treemacs-silent-filewatch              nil
              treemacs-silent-refresh                nil
              treemacs-sorting                       'alphabetic-desc
              treemacs-space-between-root-nodes      t
              treemacs-tag-follow-cleanup            t
              treemacs-tag-follow-delay              1.5
              treemacs-width                         35)

        ;; The default width and height of the icons is 22 pixels. If you are
        ;; using a Hi-DPI display, uncomment this to double the icon size.
        ;;(treemacs-resize-icons 44)

        (treemacs-follow-mode t)
        (treemacs-filewatch-mode t)
        (treemacs-fringe-indicator-mode t)
        (treemacs-toggle-show-dotfiles)
        (pcase (cons (not (null (executable-find "git")))
                     (not (null treemacs-python-executable)))
          (`(t . t)
           (treemacs-git-mode 'deferred))
          (`(t . _)
           (treemacs-git-mode 'simple))))
      :bind
      (:map global-map
            ("M-0"       . treemacs)
            ("C-x t 1"   . treemacs-delete-other-windows)
            ("C-x t B"   . treemacs-bookmark)
            ("C-x t C-t" . treemacs-find-file)
            ("C-x t M-t" . treemacs-find-tag)))

    (use-package treemacs-magit
      :after treemacs magit
      :ensure t)
#+END_SRC
* Elfeed
[[https://github.com/skeeto/elfeed][Elfeed]] is an RSS reader for emacs.
#+BEGIN_SRC emacs-lisp
  (use-package elfeed
    :bind ("C-x w" . 'elfeed))
#+END_SRC
** Hooks
elfeed can be extended with various hooks for ease of used
*** Auto tag youtube feeds
#+BEGIN_SRC emacs-lisp
  (add-hook 'elfeed-new-entry-hook
            (elfeed-make-tagger :feed-url "youtube\\.com"
                                :add '(video youtube)))
#+END_SRC
*** Do not spam unread tag
#+BEGIN_SRC emacs-lisp
  (add-hook 'elfeed-new-entry-hook
            (elfeed-make-tagger :before "2 weeks ago"
                                :remove 'unread))
#+END_SRC
* Additional Package Imports
** All The Icons
We want to have some nice looking icons
#+BEGIN_SRC emacs-lisp
    (use-package all-the-icons)
#+END_SRC

** Recentf
Show recent files in the buffer selection
#+BEGIN_SRC emacs-lisp
    (use-package recentf
      :init (recentf-mode t)
      :config
      (add-to-list 'recentf-exclude "\\.emacs.d")
      (add-to-list 'recentf-exclude ".+tmp......\\.org"))
#+END_SRC

** Rainbow Delimiters
We want to have some nicely colored delimiters when reading and writing lisp code
#+BEGIN_SRC emacs-lisp
    (use-package rainbow-delimiters
      :hook (prog-mode . rainbow-delimiters-mode))
#+END_SRC

** Markdown Mode
#+BEGIN_SRC emacs-lisp
     (use-package markdown-mode
       :mode ("\\.md$" . gfm-mode)
       :config
       (when (executable-find "pandoc")
         (setq markdown-command "pandoc -f markdown -t html")))
#+END_SRC

** Duplicate Thing
Quick bind to ~C-c u ~ to duplicate the current line
#+BEGIN_SRC emacs-lisp
     (use-package duplicate-thing
       :bind (("C-c u" . duplicate-thing)))
#+END_SRC

** ACE Window
Small package to quickly switch tiled windows.
Use ~M-p~ to quickly switch.
#+BEGIN_SRC emacs-lisp
  (use-package ace-window
    :bind (("M-o" . 'ace-window))
    :config
    (custom-set-faces
     '(aw-leading-char-face
       ((t (:inherit ace-jump-face-foreground :height 3.0))))
     ))
#+END_SRC
** htmlize
HTML Exporter for org-mode
#+BEGIN_SRC emacs-lisp
     (use-package htmlize)
#+END_SRC

** Autocompletion
#+BEGIN_SRC emacs-lisp
  (use-package company
    :config
    (global-company-mode))
#+END_SRC

** vterm
[[https://github.com/akermu/emacs-libvterm][vterm]] is a superiour alternative to the integrated eshell, shell or term modes.
The packages only works on linux and reuqires that emacs is compiled with module support (the ~module-file-suffix~ variable will be filled).
#+BEGIN_SRC emacs-lisp
  (if (and (string-equal system-type "gnu/linux")
         (bound-and-true-p module-file-suffix))
      (use-package vterm
        :ensure t
        :config
        (setq vterm-kill-buffer-on-exit t)
        (setq vterm-copy-exclude-prompt t)))
#+End_SRC
** Olivetti
A simple Emacs minor mode for a nice writing environment.
[[https://github.com/rnkn/olivetti][Gihub Link]]
#+BEGIN_SRC emacs-lisp
  (use-package olivetti
    :config
    (setq-default
     olivetti-hide-mode-line t
     olivetti-body-width 90))
#+END_SRC

Auto enable it in text modes

#+BEGIN_SRC emacs-lisp
  (add-hook 'text-mode-hook 'olivetti-mode)
#+END_SRC
** Ag
Ag.el allows you to search using ~ag~ from inside Emacs. You can filter by file type, edit results inline, or find files.

[[https://agel.readthedocs.io/en/latest/index.html][Documentation]]

#+BEGIN_SRC emacs-lisp
(use-package ag)
#+END_SRC
* Set Variables
** General Emacs Options
#+BEGIN_SRC emacs-lisp
     (setq
       compilation-always-kill t                ; Never prompt to kill a compilation session.
       compilation-scroll-output 'first-error   ; Always scroll to the bottom.
       make-backup-files nil                    ; No backups, thanks.
       auto-save-default nil                    ; Or autosaves. What's the difference between autosaves and backups?
       create-lockfiles nil                     ; Emacs sure loves to put lockfiles everywhere.
       default-directory "~/"                   ; Home sweet home.
       inhibit-startup-screen t                 ; No need to see GNU agitprop.
       kill-whole-line t                        ; Lets C-k delete the whole line
       require-final-newline t                  ; Auto-insert trailing newlines.
       ring-bell-function 'ignore               ; Do not ding. Ever.
       use-dialog-box nil                       ; Dialogues always go in the modeline.
       initial-scratch-message nil              ; SHUT UP SHUT UP SHUT UP
       save-interprogram-paste-before-kill t    ; preserve paste to system ring
       enable-recursive-minibuffers t           ; don't fucking freak out if I use the minibuffer twice
       sentence-end-double-space nil            ; are you fucking kidding me with this shit
       confirm-kill-processes nil               ; don't whine at me when I'm quitting.
       mark-even-if-inactive nil                ; prevent really unintuitive undo behavior
       load-prefer-newer t                      ; load newest file version available
       )
#+END_SRC

** Read environment variables from the shell
When not running on a windows system, we can use the env variables in emacs
#+BEGIN_SRC emacs-lisp
  (use-package exec-path-from-shell
    :if (not (eq system-type 'windows-nt))
    :config
    (exec-path-from-shell-initialize))
#+END_SRC

** Show the current filename in titlebar
#+BEGIN_SRC emacs-lisp
     (setq frame-title-format
           '((:eval user-login-name) "@" (:eval (system-name)) ": " (:eval (if (buffer-file-name)
                                                                                (abbreviate-file-name (buffer-file-name))
                                                                              "%b")) " [%*]"))
#+END_SRC

** Default encoding
#+BEGIN_SRC emacs-lisp
     (prefer-coding-system 'utf-8)
#+END_SRC

** Shorten "yes or no" questions
#+BEGIN_SRC emacs-lisp
     (defalias 'yes-or-no-p 'y-or-n-p)
#+END_SRC

** Always highlight the current line
#+BEGIN_SRC emacs-lisp
   (global-hl-line-mode t)
#+END_SRC

** Always highlight matching braces
#+BEGIN_SRC emacs-lisp
   (show-paren-mode t)
#+END_SRC

** Allow selection override
#+BEGIN_SRC emacs-lisp
   (delete-selection-mode t)
#+END_SRC

** Behave like a normal text editor
Changed: No more CUA, ~C-c~ is used in to many places that are broken by cua-mode
#+BEGIN_SRC emacs-lisp
  (cua-mode t)
#+END_SRC

** Set cursor and indet mode
#+BEGIN_SRC emacs-lisp
     (setq-default
       cursor-type 'bar
       indent-tabs-mode nil
       cursor-in-non-selected-windows nil)
#+END_SRC

** Set default column width
#+BEGIN_SRC emacs-lisp
   (set-fill-column 95)
#+END_SRC

* Hooks
** Remove trailing whitespace on file close
#+BEGIN_SRC emacs-lisp
     (add-hook 'before-save-hook 'delete-trailing-whitespace)
#+END_SRC

** Elisp
Some customization for writing elisp
#+BEGIN_SRC emacs-lisp
     (defun my-elisp-mode-hook ()
       "My elisp customizations."
       (electric-pair-mode 1)
       (add-hook 'before-save-hook 'check-parens nil t)
       (auto-composition-mode nil))

     (add-hook 'emacs-lisp-mode-hook 'my-elisp-mode-hook)
#+END_SRC
* Global Key Bindings
#+BEGIN_SRC emacs-lisp
    (bind-key "C-x k"      'kill-buffer-with-prejudice)
    (bind-key "C-x C-k"    'kill-buffer-and-window)
    (bind-key "C-c 5"      'query-replace-regexp) ;; stupid vestigial binding
    (bind-key "M-/"        'hippie-expand)
    (bind-key "C-c \\"     'align-regexp)
    (bind-key "C-c m"      'compile)
    (bind-key "C-c 3"      'split-right-and-enter)
    (bind-key "C-c 2"      'split-below-and-enter)
    (bind-key "M-p"        'switch-to-previous-buffer)
    (bind-key "C-c /"      'comment-or-uncomment-region)
    (bind-key "C-c x"      'ESC-prefix)
    (bind-key "M-i"        'delete-indentation)
    (bind-key "C-+"        'text-scale-increase)
    (bind-key "C--"	   'text-scale-decrease)
    (bind-key "C-<"        'beginning-of-buffer)
    (bind-key "C->"        'end-of-buffer)
    (bind-key "C-x C-b"    'ibuffer) ;; buffer-list is not a good default
    (bind-key "C-c n"      'line-number-mode)
#+END_SRC

** Unbind some default key bindings
#+BEGIN_SRC emacs-lisp
     (unbind-key "C-<tab>") ;; prevent switching to tab mode randomly
     (unbind-key "C-h n")   ;; I have never wanted to see emacs news ever
     (unbind-key "C-h C-n") ;; why on earth is it bound to two keybindings??
     (unbind-key "C-x C-d") ;; list-directory is utterly useless given the existence of dired
     (unbind-key "C-x C-r") ;; as is find-file-read-only
#+END_SRC
* Load additional files
All information about the current user should reside in the ~personal.el~ file.
This file contains personal information like name, email or other identifying information.
This file should contain definitions, that are the same on every device, but sould not be commited to a repository.
#+BEGIN_SRC emacs-lisp
  (setq personal-file "~/.emacs.d/personal.el")
  (load personal-file 'noerror)
#+END_SRC

Load a custom file from the emacs home dir.
This file is specific to the machine emacs runs on.
It conatins customizations and file locations that are machine dependend.
#+BEGIN_SRC emacs-lisp
    (setq custom-file "~/.emacs.d/custom.el")
    (load custom-file 'noerror)
#+END_SRC