#+TITLE: Dotfiles
#+AUTHOR: Christopher James Hayward
#+EMAIL: chris@chrishayward.xyz

#+ROAM_KEY: https://github.com/chayward1/dotfiles/

#+begin_example
                              _.-="_-         _
                         _.-="   _-          | ||"""""""---._______     __..
             ___.===""""-.______-,,,,,,,,,,,,`-''----" """""       """""  __'
      __.--""     __        ,'                   o \           __        [__|
 __-""=======.--""  ""--.=================================.--""  ""--.=======:
]       [w] : /        \ : |========================|    : /        \ :  [w] :
V___________:|          |: |========================|    :|          |:   _-"
 V__________: \        / :_|=======================/_____: \        / :__-"
 -----------'  "-____-"  `-------------------------------'  "-____-"
#+end_example

Immutable GNU Emacs dotfiles. Built for Life, Liberty, and the Open Road.
+ 100% Literate
+ 100% Immutable
+ 100% Reproducible
  
* Init
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/init.el
:END:

Although later versions of Emacs introduce =early-init.el=, it's not used in this configuration for two reasons:

+ It's not required due to the modularity
+ Maintaining support for older versions

Assuming you have completed all of the following tasks prior to proceeding further:

1. Imported the =secrets=
2. Initialized the =passwords=
3. Defined the =host= file
4. Created all required symbolic links

Launch emacs: ~emacs -mm --debug-init~
   
#+begin_src emacs-lisp
;; Load the host configuration.
(let ((host-file (concat user-emacs-directory "/hosts/" system-name ".el")))
  (when (file-exists-p host-file)
    (load-file host-file)))

;; Load the enabled modules.
(dolist (m dotfiles/modules)
  (let ((mod-file (concat dotfiles/home "/modules/" (symbol-name m) ".el")))
    (when (file-exists-p mod-file)
      (load-file mod-file))))
#+end_src

* Hosts

Each host system that runs Emacs has a file defined in the =hosts/= sub directory, following the pattern of ~$HOSTNAME.el~. All of the configurations are defined within this file, the values of which are read from by the other modules during startup and installation. This does *not* cover hosts that are controlled via =TRAMP=, as that will be covered in another section.

** Example (Ubuntu)
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/hosts/ubuntu.el
:END:

The first configuration, which was built using the Ubuntu 20.04 LTS server edition. I decided to incorporate =flatpaks= into this build. Setting the ~$BROWSER~ variable is required in the desktop module. Set the browser to the flatpak borwser currently installed, this could change to chromium, firefox, or any other browser by changing this environment variable.

#+begin_src emacs-lisp
(setenv "BROWSER" "flatpak run org.mozilla.firefox")
#+end_src

Add the modules you want to initialize to the ~dotfiles/modules~ variable.

#+begin_src emacs-lisp
(defvar dotfiles/modules '(core
                           desktop
                           writing
                           projects
                           interface))
#+end_src

Specify the ~home~ and ~cache~ directories.

#+begin_src emacs-lisp
(defvar dotfiles/cache "~/.cache/emacs")
(defvar dotfiles/home user-emacs-directory)
#+end_src

Functionality like =completion= and =hints= can be delayed to avoid popups for common manuevers. Adjust this value to your personal taste.

#+begin_src emacs-lisp
(defvar dotfiles/idle 0.0)
#+end_src

Avoid the infamous *Emacs pinky* by binding =SPC= as a leader key, utilizing the thumb instead of the weaker pinky finger. You may change this value if you want to use something else.

#+begin_src emacs-lisp
(defvar dotfiles/leader-key "SPC")
(defvar dotfiles/leader-key-global "C-SPC")
#+end_src

Define where the source repositories are stored, for integration with the *Projects* module.

#+begin_src emacs-lisp
(defvar dotfiles/src "~/.local/source/")
#+end_src

Secret keys and passwords are stored in a seperate repository.

#+begin_src emacs-lisp
(defvar dotfiles/secrets (concat dotfiles/src "secrets/"))
(defvar dotfiles/passwords (concat dotfiles/src "passwords/"))
#+end_src

* Modules

Breaking down the project into logical units or chapters to keep the code more maintainable and organized. This is also a fundemental requirement to achieve the goal of modularity. Incorporating just the =core= module on a build server to build literate programming projects is just one example of what can be achieved.

** Core
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/modules/core.el :results silent
:END:

Minimal configuration to make Emacs usable for my own personal workflow. This does very little in the ways of improving the visuals, only removing what is included by default and not required.

*** Cleanup

Emacs creates a lot of files relative to ~user-emacs-directory~, these files are not part of this immutable configuration and do not belong in the emacs directory. How can we solve this issue? Shortly after initialization, before most packages are loaded, we change the value to ~dotfiles/cache~. I elaborate more on the technique in my post [[https://chrishayward.xyz/posts/immutable-emacs/][Immutable Emacs]].

#+begin_src emacs-lisp
(setq user-emacs-directory dotfiles/cache)
#+end_src

Because this project uses version-control, we can disable more unwanted features:
+ Lock files
+ Backup files

#+begin_src emacs-lisp
(setq create-lockfiles nil
      make-backup-files nil)
#+end_src

*** Package management

Download and install packages using [[https://github.com/raxod502/straight.el][straight.el]], a functional package manager that integrates with =use-package=, giving us more control over where packages are sourced from.

+ Use the development branch
+ Integrate with ~use-package~
  
Apply the configurations prior to bootstrapping the package manager, by setting (writing) to the variables that =straight= will ultimately read from.
  
#+begin_src emacs-lisp
(setq straight-repository-branch "develop"
      straight-use-package-by-default t)
#+end_src

Bootstrap the package manager, downloading, installing, or configuring depending on the state of the configuration. All packages are downloaded and built from source, and can be pinned to specific git commit hashes.
  
#+begin_src emacs-lisp
(defvar bootstrap-version)
(let ((bootstrap-file
       (expand-file-name "straight/repos/straight.el/bootstrap.el" user-emacs-directory))
      (bootstrap-version 5))
  (unless (file-exists-p bootstrap-file)
    (with-current-buffer
        (url-retrieve-synchronously
         "https://raw.githubusercontent.com/raxod502/straight.el/develop/install.el"
         'silent 'inhibit-cookies)
      (goto-char (point-max))
      (eval-print-last-sexp)))
  (load bootstrap-file nil 'nomessage))
#+end_src

Complete the integration with ~use-package~ by installing it with =straight=.
  
#+begin_src emacs-lisp
(straight-use-package 'use-package)
#+end_src

*** Hermetic evaluation

Despite having our *stateful* and *immutable* configurations seperate, it's good practice to make efforts to reduce the trash created by Emacs.

Install [[https://github.com/emacscollective/no-littering][no-littering]] to reduce the files created by Emacs.

#+begin_src emacs-lisp
(use-package no-littering)
#+end_src

Emacs' default user interface is horrendous, but with less than 10 lines of code we can change that.

#+begin_src emacs-lisp
(setq inhibit-startup-message t)
(global-prettify-symbols-mode)
(scroll-bar-mode -1)
(menu-bar-mode -1)
(tool-bar-mode -1)
(tooltip-mode -1)
#+end_src

*** Literate programming

*Organize your plain life in plain text*

[[https://orgmode.org][Org-mode]] is one of the hallmark features of Emacs, and provides the basis for my Literate Programming platform. It's essentially a markdown language with rich features for project management, scheduling, development, and writing. It's hard to convey everything within its capabilities.

+ [[https://orgmode.org/worg/org-contrib/babel/languages/index.html][Babel languages]]
+ [[https://orgmode.org/manual/Structure-Templates.html][Structure templates]]

#+begin_src emacs-lisp
(use-package org
  :hook
  (org-mode . (lambda ()
		      (org-indent-mode)
		      (visual-line-mode 1)
		      (variable-pitch-mode 1)))
  :config
  (setq org-ellipsis " ▾"
	      org-log-done 'time
	      org-log-into-drawer t
        org-directory dotfiles/home
	      org-src-preserve-indentation t)

  (org-babel-do-load-languages
   'org-babel-load-languages
   '((shell . t)
     (python . t)
     (emacs-lisp . t)))

  (require 'org-tempo)
  (add-to-list 'org-structure-template-alist '("s" . "src"))
  (add-to-list 'org-structure-template-alist '("q" . "quote"))
  (add-to-list 'org-structure-template-alist '("e" . "example"))
  (add-to-list 'org-structure-template-alist '("sh" . "src shell"))
  (add-to-list 'org-structure-template-alist '("py" . "src python"))
  (add-to-list 'org-structure-template-alist '("el" . "src emacs-lisp")))
#+end_src

#+begin_src emacs-lisp
(defun dotfiles/tangle (dir)
  "Recursively tangle the Org files within a directory."
  (interactive)
  (let ((org-files (directory-files-recursively dir "org")))
    (dolist (f org-files)
      (org-babel-tangle-file f))))
#+end_src

*** Custom keybindings

Make the =ESC= key quit (most) prompts, instead of the default =C-g=.

#+begin_src emacs-lisp
(global-set-key (kbd "<escape>") 'keyboard-escape-quit)
#+end_src

**** Hints

Download [[https://github.com/justbur/emacs-which-key][which-key]], a package that displays the current incomplete keybinding input in a mini-buffer, showing available completion options.

#+begin_src emacs-lisp
(use-package which-key
  :diminish which-key-mode
  :init (which-key-mode)
  :config (setq which-key-idle-delay dotfiles/idle))
#+end_src

**** Leader

Implement the *leader* key using [[https://github.com/noctuid/general.el][general.el]], letting us easily configure prefixed keybindings in a much cleaner manner than the default methods.

#+begin_src emacs-lisp
(use-package general
  :config
  (general-create-definer dotfiles/leader
    :states '(normal motion)
    :keymaps 'override
    :prefix dotfiles/leader-key
    :global-prefix dotfiles/leader-key-global))
#+end_src 

Use [[https://github.com/abo-abo/hydra][hydra]] for transient keybindings sharing a common prefix.

#+begin_src emacs-lisp
(use-package hydra)
#+end_src

**** Evil mode

After a few hour with =vim= I knew it was game over, I cannot even think of another way I would feel comfortable editing text. Luckily, there exist packages to emulate this within Emacs. [[https://evil.readthedocs.io/en/latest/index.html][evil-mode]] is the extensible VI layer for Emacs.

#+begin_src emacs-lisp
(use-package evil
  :init (setq evil-want-integration t
	      evil-want-keybinding nil)
  :config (evil-mode 1))
#+end_src

Unfortunately the default keybindings are *lacking*, but there is a community curated package [[https://github.com/emacs-evil/evil-collection][evil-collection]], which does a much better job implementing keybindings you would expect to find.

#+begin_src emacs-lisp
(use-package evil-collection
  :after evil
  :config (evil-collection-init))
#+end_src

Surround text with functions, quotations, and any other symbols using the [[https://github.com/emacs-evil/evil-surround][evil-surround]] package.

#+begin_src emacs-lisp
(use-package evil-surround
  :config (global-evil-surround-mode 1))
#+end_src

https://github.com/redguardtoo/evil-nerd-commenter
+ Toggle comments with =M-;=

#+begin_src emacs-lisp
(use-package evil-nerd-commenter
  :bind ("M-;" . evilnc-comment-or-uncomment-lines))
#+end_src

**** Shortcuts

Again cherry picked from =Doom=, I want to continue utilizing the muscle memory I have developed from a year of mainlining the framework.

+ Close buffers with =SPC c=
+ Find files with =SPC . (period)=
+ Switch buffers with =SPC , (comma)=

#+begin_src emacs-lisp
(dotfiles/leader
  "." '(find-file :which-key "Files")
  "," '(switch-to-buffer :which-key "Buffers")
  "c" '(kill-buffer-and-window :which-key "Close"))
#+end_src

Run helper functions with =SPC h=.
+ Packages =p=
+ Variables =v=
+ Functions =f=

#+begin_src emacs-lisp
(dotfiles/leader
  "h" '(:ignore t :which-key "Help")
  "hp" '(describe-package :which-key "Package")
  "hv" '(describe-variable :which-key "Variable")
  "hf" '(describe-function :which-key "Function"))
#+end_src

Quit emacs with =SPC q=.
+ Saving =q=
+ Without =w=
+ Frame (daemon) =f=

#+begin_src emacs-lisp
(dotfiles/leader
  "q" '(:ignore t :which-key "Quit")
  "qq" '(save-buffers-kill-emacs :which-key "Save")
  "qw" '(kill-emacs :which-key "Now")
  "qf" '(delete-frame :which-key "Frame"))
#+end_src

Window management with =SPC w=.
+ Swap with =w=
+ Close with =c=
+ Motions with =h,j,k,l=
+ Split with =s + <MOTION>=

#+begin_src emacs-lisp
(dotfiles/leader
  "w" '(:ignore t :which-key "Window")
  "ww" '(window-swap-states :which-key "Swap")
  "wc" '(delete-window :which-key "Close")
  "wh" '(windmove-left :which-key "Left")
  "wj" '(windmove-down :which-key "Down")
  "wk" '(windmove-up :which-key "Up")
  "wl" '(windmove-right :which-key "Right")
  "ws" '(:ignore t :which-key "Split")
  "wsj" '(split-window-below :which-key "Down")
  "wsl" '(split-window-right :which-key "Right"))
#+end_src

Place runtime tweaks behind =SPC t=.

#+begin_src emacs-lisp
(dotfiles/leader
  "t" '(:ignore t :which-key "Tweaks"))
#+end_src

*** Version control

Another hallmark feature is [[https://github.com/magit/magit][Magit]], a complete git porcelain within Emacs.

#+begin_src emacs-lisp
(use-package magit
  :custom (magit-display-buffer-function
           #'magit-display-buffer-same-window-except-diff-v1))
#+end_src

Work directly with github issues / pull requests using [[https://github.com/magit/forge][Forge]].
+ Requires a valid ~$GITHUB_TOKEN~

#+begin_src emacs-lisp
(use-package forge)
#+end_src

Open the *status* page for the current repository with =SPC g=.

#+begin_src emacs-lisp
(dotfiles/leader
  "g" '(magit-status :which-key "Magit"))
#+end_src

*** Terminal emulation

While not a traditional terminal emulator, =eshell= provides me with all of the functionality I expect and require from one. Some users may be left wanting more, I would recommend they look into =vterm=.

https://github.com/zwild/eshell-prompt-extras
+ Enable lambda shell prompt

#+begin_src emacs-lisp
(use-package eshell-prompt-extras
  :config (setq eshell-highlight-prompt nil
	            eshell-prompt-function 'epe-theme-lambda))
#+end_src

Open an =eshell= buffer with =SPC e=.

#+begin_src emacs-lisp
(dotfiles/leader
  "e" '(eshell :which-key "Shell"))
#+end_src

*** File management

Emacs' can feel more modern when icon-fonts are installed and prioritized. I feel that this makes navigation of folders much faster, given that file types may be quickly identified by their corresponding icons.

https://github.com/domtronn/all-the-icons.el
+ Collects various icon fonts

#+begin_src emacs-lisp
(use-package all-the-icons)
#+end_src
  
https://github.com/jtbm37/all-the-icons-dired
+ Integration with dired

#+begin_src emacs-lisp
(use-package all-the-icons-dired
  :hook (dired-mode . all-the-icons-dired-mode))
#+end_src

When opening =dired=, I don't want to have to press =RET= twice to navigate to the current directory. This can be avoided with ~dired-jump~, included in the =dired-x= package shipped with =dired=.

#+begin_src emacs-lisp
(require 'dired-x)
#+end_src

By default =dired= will create a new buffer everytime you press =RET= over a directory. In my workflow this leads to many unwanted =dired= buffers that have to be cleaned up manually. [[https://github.com/crocket/dired-single][Dired-single]] lets us reuse the same dired buffer.

+ Move up a directory with =h=
+ Open a single buffer with =l=

#+begin_src emacs-lisp
(use-package dired-single
  :config
  (evil-collection-define-key 'normal 'dired-mode-map
    "h" 'dired-single-up-directory
    "l" 'dired-single-buffer))
#+end_src

Open a dired buffer with =SPC d=.

#+begin_src emacs-lisp
(dotfiles/leader
  "d" '(dired-jump :which-key "Dired"))
#+end_src

** Desktop
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/modules/desktop.el :results silent
:END:

I use Emacs as a Desktop Environment with the [[https://github.com/ch11ng/exwm][exwm]] package. It allows Emacs to function as a complete tiling window manager for =X11=. My workflow includes launching the window manager with =xinitrc=, without the use of a display manager, controlling *everything* within Emacs.

*** Startup

#+begin_src conf :tangle ~/.local/source/dotfiles/config/xinitrc
exec dbus-launch --exit-with-session emacs -mm --debug-init
#+end_src

When launching into a session, if the display server is not running then =startx= should be invoked, to run the window manager.

#+begin_src sh :tangle ~/.local/source/dotfiles/config/profile
if [ -z "${DISPLAY}" ] && [ "${XDG_VTNR}" -eq 1 ]; then
    exec startx
fi
#+end_src

*** Applications

Define a method to run an external process, allowing us to launch any application on a new process without interferring with Emacs.

#+begin_src emacs-lisp
(defun dotfiles/run (command)
  "Run an external process."
  (interactive (list (read-shell-command "λ ")))
  (start-process-shell-command command nil command))
#+end_src

Some methods must be called and applied to the current call process in order to function correctly with Emacs hooks.

#+begin_src emacs-lisp
(defun dotfiles/run-in-background (command)
  (let ((command-parts (split-string command "[ ]+")))
    (apply #'call-process `(,(car command-parts) nil 0 nil ,@(cdr command-parts)))))
#+end_src

+ Run shell commands with =SPC x=
+ Run async shell commands with =SPC z=

#+begin_src emacs-lisp
(dotfiles/leader
  "x" '(dotfiles/run :which-key "Run")
  "z" '(async-shell-command :which-key "Async"))
#+end_src

*** Initialization

When the window manager first launches the ~init-hook~ will be called, this allows us to define some custom logic when it's initialized.

+ Display time and date
+ Display battery info (if available)

In my personal configuration, I do not want the battery or time displayed within Emacs when it's not running as desktop environment because that information is typically already available.

#+begin_src emacs-lisp
(defun dotfiles/init-hook ()
  (exwm-workspace-switch-create 1)
  (setq display-time-and-date t)
  (display-battery-mode 1)
  (display-time-mode 1))
#+end_src

*** Displays

Using =autorandr= with pre configured profiles, switching screens (AKA hot plugging) is also handled through a hook.

#+begin_src emacs-lisp
(defun dotfiles/update-display ()
  (dotfiles/run-in-background "autorandr --change --force"))
#+end_src

*** Configuration

Finally we configure the window manager.

+ Enable =randr= support

Connect our custom hooks and configure the input keys, a custom layer for defining which keys are captured by Emacs, and which are passed through to =X= applications.

+ Pass through to Emacs
  + =M-x= to Emacs
  + =C-g= to Emacs
  + =C-SPC= to Emacs
  
+ Bindings with =S= (Super / Win)
  + Reset =S-r=
  + Launch =S-&=
  + Workspace =S-[1..9]=
    
#+begin_src emacs-lisp
(use-package exwm
  :config
  (require 'exwm-randr)
  (exwm-randr-enable)
  (add-hook 'exwm-init-hook #'dotfiles/init-hook)
  (add-hook 'exwm-randr-screen-change-hook #'dotfiles/update-display)
  (dotfiles/update-display)
  (setq exwm-input-prefix-keys
        '(?\M-x
          ?\C-g
          ?\C-\ )
        exwm-input-global-keys
        `(([?\s-r] . exwm-reset)
          ([?\s-&] . dotfiles/run)
          ,@(mapcar (lambda (i)
                      `(,(kbd (format "s-%d" i)) .
                        (lambda ()
                          (interactive)
                          (exwm-workspace-switch-create ,i))))
                    (number-sequence 1 9))))
  (exwm-enable))
#+end_src

** Writing
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/modules/writing.el :results silent
:END:

I am using [[https://orgmode.org][Org-mode]] extensively for writing projects for different purposes. Most of the improvements are done in the *Core* module for the Literate programming configuration. [[https://github.com/integral-dw/org-superstar-mode][Org-superstar-mode]] for making headline stars more *super*.

#+begin_src emacs-lisp
(use-package org-superstar
  :hook (org-mode . org-superstar-mode))
#+end_src

I use [[https://gohugo.io][Hugo]] for my personal [[https://chrishayward.xyz][website]], which I write in =Org-mode= before compiling to =hugo-markdown=. [[https://github.com/kaushalmodi/ox-hugo][Ox-hugo]], configured for =one-post-per-file= is my technique for managing my blog.

#+begin_src emacs-lisp
(use-package ox-hugo 
  :after ox)
#+end_src

Produce high quality presentations that work anywhere with =HTML/JS= and the [[https://revealjs.com][Reveal.js]] package. [[https://github.com/hexmode/ox-reveal][Ox-reveal]], configured to use a =cdn= allows us to produce ones that are not dependent on a local version of =Reveal.js=.

#+begin_src emacs-lisp
(use-package ox-reveal
  :after ox
  :custom (org-reveal-root "https://cdn.jsdelivr.net/npm/reveal.js"))
#+end_src

*** Roam

Download and install [[https://orgroam.com][org-roam]], a plain text knowledge management system for Emacs.

#+begin_src emacs-lisp
(use-package org-roam
  :hook (after-init . org-roam-mode)
  :custom
  (org-roam-directory org-directory)
  (org-roam-encrypt-files t))
#+end_src

Visualize the org-roam database with the server, available when the editor is running at http://localhost:8080

#+begin_src emacs-lisp
(use-package org-roam-server
  :hook (org-roam-mode . org-roam-server-mode))
#+end_src

Place keybindings behind =SPC r=.

+ Find with =f=
+ Toggle buffer with =b=
+ Dailies with =d=
  + Arbitrary date with =d=
  + Today with =t=
  + Tomorrow with =m=
  + Yesterday with =y=

#+begin_src emacs-lisp
(dotfiles/leader
  "r" '(:ignore t :which-key "Roam")
  "rf" '(org-roam-find-file :which-key "Find")
  "rb" '(org-roam-buffer-toggle-display :which-key "Buffer")
  "rd" '(:ignore t :which-key "Dailies")
  "rdd" '(org-roam-dailies-find-date :which-key "Date")
  "rdt" '(org-roam-dailies-find-today :which-key "Today")
  "rdm" '(org-roam-dailies-find-tomorrow :which-key "Tomorrow")
  "rdy" '(org-roam-dailies-find-yesterday :which-key "Yesterday"))
#+end_src

Organize the capture templates, this allows me to quickly dictate where each new item should be placed.

+ ~posts/~ contains blog posts
+ ~notes/~ contains cited notes on others' work
+ ~slides/~ contains presentations / screencasts

#+begin_src emacs-lisp
(setq org-roam-capture-templates
      '(("p" "Posts" plain (function org-roam-capture--get-point)
          "%?"
          :file-name "docs/posts/${slug}"
          :unnarrowed t
          :head
"
,#+TITLE: ${title}
,#+AUTHOR: Christopher James Hayward
,#+DATE: %<%Y-%m-%d>

,#+EXPORT_FILE_NAME: ${slug}
,#+ROAM_KEY: https://chrishayward.xyz/posts/${slug}/

,#+HUGO_BASE_DIR: ../../website/
,#+HUGO_AUTO_SET_LASTMOD: t
,#+HUGO_SECTION: posts
,#+HUGO_DRAFT: true
")
        ("n" "Notes" plain (function org-roam-capture--get-point)
          "%?"
          :file-name "docs/notes/${slug}"
          :unnarrowed t
          :head
"
,#+TITLE: ${title}
,#+AUTHOR: Christopher James Hayward

,#+EXPORT_FILE_NAME: ${slug}
,#+ROAM_KEY: https://chrishayward.xyz/notes/${slug}/

,#+HUGO_BASE_DIR: ../../website
,#+HUGO_AUTO_SET_LASTMOD: t
,#+HUGO_SECTION: notes
,#+HUGO_DRAFT: true
")
        ("s" "Slides" plain (function org-roam-capture--get-point)
         "%?"
         :file-name "docs/slides/${slug}"
         :unnarrowed t
         :head
"
,#+TITLE: ${title}
,#+AUTHOR: Christopher James Hayward

,#+REVEAL_ROOT: https://cdn.jsdelivr.net/npm/reveal.js
")))
#+end_src

By default I want my daily notes to live in ~daily/~ relative to my dotfiles.

#+begin_src emacs-lisp
(setq org-roam-dailies-capture-templates
      '(("d" "Default" entry (function org-roam-capture--get-point)
         "* %?"
         :file-name "docs/daily/%<%Y-%m-%d>"
         :head
"
,#+TITLE: %<%Y-%m-%d>
,#+AUTHOR: Christopher James Hayward
")))
#+end_src

*** Email

Plain text email delivered via mu, mu4e and mbsync. I run my own email server, so your configuration may differ from mine. This is the ~mbsyncrc~ file I use to synchronize my local mail with my server. This is required for mu4e in Emacs.

#+begin_src conf :tangle ~/.local/source/dotfiles/config/mbsyncrc
IMAPStore xyz-remote
Host mail.chrishayward.xyz
User chris@chrishayward.xyz
PassCmd "pass chrishayward.xyz/chris"
SSLType IMAPS

MaildirStore xyz-local
Path ~/.cache/mail/
Inbox ~/.cache/mail/inbox
SubFolders Verbatim

Channel xyz
Master :xyz-remote:
Slave :xyz-local:
Patterns * !Archives
Create Both
Expunge Both
SyncState *
#+end_src

The system typically expects to find this file at ~$HOME/.mbsyncrc~, but you may also specify a custom path if launching the command using arguments. I chose to symlink the default location to my repository.

#+begin_src shell :tangle no
mbsync -a
mu index --maildir="~/.cache/mail"
#+end_src

Once the mail is being synchronized, and the mail has been indexed with =mu=, it's time to install the required packages for Emacs.

#+begin_src emacs-lisp
(use-package mu4e
  :load-path "/usr/share/emacs/site-lisp/mu4e"
  :config
  (setq mu4e-change-filenames-when-moving t
        mu4e-update-interval (* 5 60) ;; Every 5 minutes.
        mu4e-get-mail-command "mbsync -a"
        mu4e-maildir "~/.cache/mail"
        mu4e-compose-signature 
          (concat "Chris Hayward\n"
                  "https://chrishayward.xyz\n"))

  ;; Ensure plain text scales for all devices.
  (setq mu4e-compose-format-flowed t)

  ;; GPG signing key for outbound mail.
  (setq mml-secure-openpgp-signers '("37AB1CB72B741E478CA026D43025DCBD46F81C0F"))
  (add-hook 'message-send-hook 'mml-secure-message-sign-pgpmime)

  (setq message-send-mail-function 'smtpmail-send-it)  

  ;; Configure mail account(s).
  (setq mu4e-contexts
    (list
      ;; Main
      ;; chris@chrishayward.xyz
      (make-mu4e-context
        :name "Main"
        :match-func
          (lambda (msg)
            (when msg 
              (string-prefix-p "/Main" (mu4e-message-field msg :maildir))))
        :vars
          '((user-full-name . "Christopher James Hayward")
            (user-mail-address . "chris@chrishayward.xyz")
            (smtpmail-smtp-server . "mail.chrishayward.xyz")
            (smtpmail-smtp-service . 587)
            (smtpmail-stream-type . starttls))))))
#+end_src

Use [[https://github.com/iqbalansari/mu4e-alert][mu4e-alert]] to give us desktop notifications about incoming mail.

#+begin_src emacs-lisp
(use-package mu4e-alert
  :custom
  (mu4e-alert-set-default-style 'libnotify)
  :config
  (mu4e-alert-enable-notifications)
  (mu4e-alert-enable-mode-line-display))
#+end_src

Create a keybinding to open the mail dashboard with =SPC m=.

#+begin_src emacs-lisp
(dotfiles/leader
  "m" '(mu4e :which-key "Mail"))
#+end_src

*** Agenda

Override ~org-agenda-file-regexp~ to include =.org.gpg= files.

#+begin_src emacs-lisp
(unless (string-match-p "\\.gpg" org-agenda-file-regexp)
  (setq org-agenda-file-regexp
        (replace-regexp-in-string "\\\\\\.org" "\\\\.org\\\\(\\\\.gpg\\\\)?"
                                  org-agenda-file-regexp)))
#+end_src

Configure agenda sources.
  
#+begin_src emacs-lisp
(setq org-agenda-files '("~/.emacs.d/docs/"
                         "~/.emacs.d/docs/daily/"))
#+end_src

Open an agenda buffer with =SPC a=.

#+begin_src emacs-lisp
(dotfiles/leader
  "a" '(org-agenda :which-key "Agenda"))
#+end_src

*** Images

Create screencasts with =one-frame-per-action= GIF recording via [[https://github.com/takaxp/emacs-gif-screencast][emacs-gif-screencast]].

+ Can be paused / resumed
+ High quality images
+ Optimized size

It requires the installation of ~scrot~, ~gifsicle~, and ~convert~ from the =ImageMagick= library.
  
#+begin_src emacs-lisp
(use-package gif-screencast
  :custom
  (gif-screencast-output-directory (concat dotfiles/home "docs/images/")))
#+end_src

Screencast controls behind =SPC s=.
+ Start / stop with =s=
+ Pause with =t=

#+begin_src emacs-lisp
(dotfiles/leader
  "s" '(:ignore t :which-key "Screencast")
  "ss" '(gif-screencast-start-or-stop :which-key "Start / Stop")
  "sp" '(gif-screencast-toggle-pause :which-key "Pause"))
#+end_src

** Projects
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/modules/projects.el :results silent
:END:

An IDE like experience (or better) can be achieved in Emacs using two *Microsoft* open source initiatives.

Turn Emacs into an *IDE* (or better) with the [[https://microsoft.github.io/language-server-protocol/][Language Server Protocol]], an open source initiative from *Microsoft* for the *VSCode* editor.

[[https://emacs-lsp.github.io/lsp-mode/][Lsp-mode]] brings support for language servers into Emacs.
  
#+begin_src emacs-lisp
(use-package lsp-mode
  :custom (gc-cons-threshold 1000000000)
          (lsp-idle-delay 0.500))
#+end_src

https://emacs-lsp.github.io/lsp-ui/
+ UI improvements for =lsp-mode=

#+begin_src emacs-lisp
(use-package lsp-ui
  :custom (lsp-ui-doc-position 'at-point)
          (lsp-ui-doc-delay 0.500))
#+end_src

*** Management

Configure [[https://projectile.mx][projectile]], a project interaction library for Emacs. It provides a nice set of features for operating on a project level without introducing external dependencies.

#+begin_src emacs-lisp
(use-package projectile
  :config
  (setq projectile-project-search-path '("~/.local/source"))
  (projectile-mode))
#+end_src

*** Passwords

Pass makes managing passwords extremely easy, encrypring them in a file structure and providing easy commands for generating, modify, and copying passwords. =password-store.el= provides a wrapper for the functionality within Emacs.

#+begin_src emacs-lisp
(use-package password-store
  :custom (password-store-dir dotfiles/passwords))
#+end_src

Configure keybindings behind =SPC p=.
+ Copy with =p=
+ Rename with =r=
+ Generate with =g=

#+begin_src emacs-lisp
(dotfiles/leader
  "p" '(:ignore t :which-key "Passwords")
  "pp" '(password-store-copy :which-key "Copy")
  "pr" '(password-store-rename :which-key "Rename")
  "pg" '(password-store-generate :which-key "Generate"))
#+end_src

*** Debugging

Handled through the [[https://microsoft.github.io/debug-adapter-protocol/][Debug Adapter Protocol]], an open source initiative from *Microsoft* for the *VSCode* editor.

[[https://emacs-lsp.github.io/dap-mode/][Dap-mode]] adds support for the protocol to Emacs.

#+begin_src emacs-lisp
(use-package dap-mode)
#+end_src

*** Completion

Text completion framework via =company= aka *Complete Anything*.

http://company-mode.github.io/
+ Integrate with =lsp-mode=
  
#+begin_src emacs-lisp
(use-package company)
(use-package company-lsp)
#+end_src

*** Languages

Support for individual languages are implemented here.

**** C/C++

Install the [[https://github.com/MaskRay/ccls][ccls]] language server.

#+begin_src emacs-lisp
(use-package ccls
  :hook ((c-mode c++-mode objc-mode cuda-mode) .
         (lambda () (require 'ccls) (lsp))))
#+end_src
  
**** Python

Install the =pyls= language server.

#+begin_src shell :tangle no
pip install --user "python-language-server[all]"
#+end_src

[[https://www.emacswiki.org/emacs/PythonProgrammingInEmacs][python-mode]] is an Emacs built in mode.
  
#+begin_src emacs-lisp
(use-package python-mode
  :hook (python-mode . lsp)
  :config (require 'dap-python)
  :custom (python-shell-interpreter "python3") ;; Required if "python" is not python 3.
          (dap-python-executable "python3")    ;; Same as above.
          (dap-python-debugger 'debugpy))
#+end_src

**** Go
  
Install the =gopls= language server.

#+begin_src sh :tangle no
GO111MODULE=on go get golang.org/x/tools/gopls@latest
#+end_src

Set the ~GOPATH~ environment variable prior to loading, this allows us to change the default value of ~$HOME/go~ to ~$HOME/.go~.

#+begin_src emacs-lisp
(setenv "GOPATH" (concat (getenv "HOME") "/.go/"))
#+end_src

Additionally, include the =bin= subdirectory of the ~$GOPATH~ in the ~$PATH~ variable, adding compiled golang programs.

#+begin_src emacs-lisp
(setenv "PATH" (concat (getenv "GOPATH") "bin:" (getenv "PATH")))
#+end_src

Finally we can include the =go-mode= package, integrating it with =lsp=.

#+begin_src emacs-lisp
(use-package go-mode
  :hook (go-mode . lsp))
#+end_src

Apply some custom behaviour before saving:

+ Format buffer
+ Organize imports

#+begin_src emacs-lisp
(defun dotfiles/go-hook ()
  (add-hook 'before-save-hook #'lsp-format-buffer t t)
  (add-hook 'before-save-hook #'lsp-organize-imports t t))
#+end_src
  
#+begin_src emacs-lisp
(add-hook 'go-mode-hook #'dotfiles/go-hook)
#+end_src

** Interface
:PROPERTIES:
:header-args: :tangle ~/.local/source/dotfiles/modules/interface.el :results silent
:END:

*Bring Emacs out of the eighties*

*** Fonts

Configure the system font with a single ~font-family~ and define the size, of which variations to the font size are relative to this value.

#+begin_src emacs-lisp
(defvar dotfiles/font "Fira Code")
(defvar dotfiles/font-size 96)
#+end_src

Write out to all *3* of Emacs' default font faces.

#+begin_src emacs-lisp
(set-face-attribute 'default nil :font dotfiles/font :height dotfiles/font-size)
(set-face-attribute 'fixed-pitch nil :font dotfiles/font :height dotfiles/font-size)
(set-face-attribute 'variable-pitch nil :font dotfiles/font :height dotfiles/font-size)
#+end_src

Define a transient keybinding for scaling the text.
  
#+begin_src emacs-lisp
(defhydra hydra-text-scale (:timeout 4)
  "Scale"
  ("j" text-scale-increase "Increase")
  ("k" text-scale-decrease "Decrease")
  ("f" nil "Finished" :exit t))
#+end_src

Increase the font size in buffers with =SPC t f=.
+ Increase =j=
+ Decrease =k=
+ Finish =f=

#+begin_src emacs-lisp
(dotfiles/leader
  "tf" '(hydra-text-scale/body :which-key "Font"))
#+end_src

*** Lines

Relative line numbers are important when using =VI= emulation keys. You can prefix most commands with a *number*, allowing you to jump up / down by a line count.

#+begin_example
  5:
  4:
  3:
  2:
  1:
156: << CURRENT LINE >>
  1:
  2:
  3:
  4:
  5:
#+end_example

https://github.com/emacsmirror/linum-relative
+ Integrate with ~display-line-numbers-mode~ for performance

#+begin_src emacs-lisp
(use-package linum-relative
  :init (setq linum-relative-backend
              'display-line-numbers-mode)
  :config (linum-relative-global-mode))
#+end_src

Add line numbers to the toggles behind =SPC t l=.

#+begin_src emacs-lisp
(dotfiles/leader
  "tl" '(linum-relative-global-mode :which-key "Lines"))
#+end_src

https://github.com/Fanael/rainbow-delimiters
+ Colourize nested parenthesis

#+begin_src emacs-lisp
(use-package rainbow-delimiters
  :hook (prog-mode . rainbow-delimiters-mode))
#+end_src

*** Themes

Cherry pick a few modules from =doom-emacs=. High quality and modern colour themes are provided in the [[https://github.com/hlissner/emacs-doom-themes][doom-themes]] package.

#+begin_src emacs-lisp
(use-package doom-themes
  :init (load-theme 'doom-moonlight t))
#+end_src

[[https://github.com/seagle0128/doom-modeline][doom-modeline]] provides an elegant status bar / modeline.

#+begin_src emacs-lisp
(use-package doom-modeline
  :init (doom-modeline-mode 1)
  :custom ((doom-modeline-height 16)))
#+end_src

Load a theme with =SPC t t=.

#+begin_src emacs-lisp
(dotfiles/leader
  "tt" '(load-theme t t :which-key "Theme"))
#+end_src

*** Ligatures

Enable font ligatures via [[https://github.com/jming422/fira-code-mode][fira-code-mode]], perform this action *only* when ~Fira Code~ is set as the current font.

#+begin_src emacs-lisp
(use-package fira-code-mode
  :hook (prog-mode org-mode))
#+end_src

Toggle global ligature mode with =SPC t g=.

#+begin_src emacs-lisp
(dotfiles/leader
  "tg" '(global-fira-code-mode :which-key "Ligatures"))
#+end_src

*** Dashboard

Present a dashboard when first launching Emacs.

#+begin_src emacs-lisp
(use-package dashboard
  :config
  (setq dashboard-center-content t
        dashboard-set-init-info t
        dashboard-set-file-icons t
        dashboard-set-heading-icons t
        dashboard-set-navigator t
        dashboard-startup-banner 'logo
        dashboard-projects-backend 'projectile
        dashboard-items '((projects . 5)
                          (recents . 5)
                          (agenda . 5 )))
  (dashboard-setup-startup-hook))
#+end_src

Customize the buttons of the navigator:

+  Brain @ http://localhost:8080
+  Homepage @ https://chrishayward.xyz
+  Athabasca @ https://login.athabascau.ca/cas/login

#+begin_src emacs-lisp
(setq dashboard-navigator-buttons
      `(;; First row.
        ((,(all-the-icons-fileicon "brain" :height 1.1 :v-adjust 0.0)
         "Brain"
         "Knowledge base"
         (lambda (&rest _) (browse-url "http://localhost:8080"))))
        ;; Second row.
        ((,(all-the-icons-material "public" :height 1.1 :v-adjust 0.0)
         "Homepage"
         "Personal website"
         (lambda (&rest _) (browse-url "https://chrishayward.xyz"))))
        ;; Third row.
        ((,(all-the-icons-faicon "university" :height 1.1 :v-adjust 0.0)
         "Athabasca"
         "Univeristy login"
         (lambda (&rest _) (browse-url "https://login.athabascau.ca/cas/login"))))))
#+end_src

When running in *daemon* mode, ensure that the dashboard is the initial buffer.

#+begin_src emacs-lisp
(setq initial-buffer-choice
      (lambda ()
        (get-buffer "*dashboard*")))
#+end_src