#+startup: content
#+title: Emacs setup for use with LaTeX, Org, and Python
#+author: Gerard Vermeulen
#+babel: :cache no
#+property: header-args :tangle init.el :comments link
#+property: header-args:emacs-lisp :results silent
#+latex_class: article
#+latex_class_options: [11pt,a4paper,svgnames]
#+latex_header: \hypersetup{
#+latex_header:   citecolor=blue,
#+latex_header:   colorlinks=true,
#+latex_header:   filecolor=blue,
#+latex_header:   hyperfootnotes=false,
#+latex_header:   linkcolor=blue,
#+latex_header:   unicode=true,
#+latex_header:   urlcolor=blue
#+latex_header: }
#+latex_header: \usepackage{minted}
#+latex_header: \usemintedstyle{xcode}
#+latex_header: \usepackage[
#+latex_header:   headheight=20mm,
#+latex_header:   top=40mm,
#+latex_header:   bottom=20mm,
#+latex_header:   left=0.1\paperwidth,
#+latex_header:   right=0.1\paperwidth,
#+latex_header:   heightrounded,
#+latex_header:   verbose,
#+latex_header: ]{geometry}

* Quick start
:PROPERTIES:
:CUSTOM_ID: sec:quick-start
:END:

Backup your =~/.emacs.d= directory to execute the following commands:
#+begin_src shell :noeval :tangle no
  cd ~
  git clone ccdr@mercury.grenoble.cnrs.fr:SERVER/.emacs.d
  make --directory=.emacs.d init
#+end_src
After its invokation, Emacs will install a minimal set of packages.  Now, you
have the option to install all optional packages using the command
=my-install-optional-packages=, but you can do this any time, or you can install
any package using the command =package-install= whenever you like.  Quit Emacs
and invoke Emacs again.

* Introduction
:PROPERTIES:
:CUSTOM_ID: sec:introduction
:END:

This Emacs setup aims to install automatically a minimal set of extension
packages that allows to handle my reports and presentations.  The file format of
the reports is [[https://orgmode.org/][Org Mode]] plain text with [[https://www.python.org/][Python]] source code blocks and the file
format of the presentations is [[https://www.latex-project.org/][LaTeX]].

This [[info:org#Top][org]] file (more precisely the original [[info:org#Top][org]] source file of this file)
illustrates my work-flow by showing:
1. How to tangle (or export) source blocks from [[info:org#Top][org]] files. This file contains
   source blocks to produce the files =early-init.el=, =init.el=, =latexmkrc=,
   =org-store-link=, and =example.py= by tangling.
2. How to export [[info:org#Top][org]] files to other formats such as [[https://en.wikipedia.org/wiki/HTML][HTML]], [[https://www.latex-project.org/][LaTeX]], and [[https://en.wikipedia.org/wiki/PDF][PDF]].
3. How [[info:org#Hyperlinks][org hyperlinks (info)]] allow to link inside and outside [[info:org#Top][Org Mode]]: hover
   over or click on the links to experiment.

The [[https://en.wikipedia.org/wiki/AUCTeX][AUCTeX - Aalborg University Center TeX]] extension package provides a
powerful [[https://en.wikipedia.org/wiki/Text-based_user_interface][Text-based User Interface (TUI)]] environment to edit the [[https://www.latex-project.org/][LaTeX]]
presentations.

The [[https://github.com/bdarcus/citar][citar]] extension package provides quick filtering and selecting of
bibliographic entries, and the option to run different commands on those
selections.  [[https://github.com/bdarcus/citar][Citar]] requires [[info:org#Top][Org-9.5 (info)]], which is already part of Emacs-28.1.
[[https://github.com/bdarcus/citar][Citar]] exploits the enhancements of Emacs' builtin selection mechanism provided
by the extension packages [[https://github.com/minad/vertico][vertico]], [[https://github.com/oantolin/orderless][orderless]], [[https://github.com/oantolin/embark][embark]], [[https://github.com/minad/marginalia][marginalia]], and [[https://github.com/minad/consult][consult]].
The [[https://github.com/andras-simonyi/citeproc-el][citeproc]] extension package provides [[https://citationstyles.org/][CSL: citation style language]] processing
capabilities to [[https://github.com/bdarcus/citar][citar]] and [[https://orgmode.org/][Org Mode]].

The [[https://github.com/vedang/pdf-tools][pdf-tools]] extension package renders [[https://en.wikipedia.org/wiki/PDF][PDF]] file with the possibility to
annotate the file or to click on anchors in the [[https://en.wikipedia.org/wiki/PDF][PDF]] file that link back to the
original [[https://www.latex-project.org/][LaTeX]] file of the document.  An example of my work-flow are the steps
to convert this [[info:org#Top][org]] file to [[https://en.wikipedia.org/wiki/PDF][PDF]] and to see the result with [[https://github.com/vedang/pdf-tools][pdf-tools]] in Emacs:
execute the commands ~pdf-tools-install~, ~org-babel-tangle~,
~org-latex-export-latex-to-latex~, and ~compile~.  This sets up an infinite
[[https://www.latex-project.org/][LaTeX]] compilation loop to update and redisplay the [[https://en.wikipedia.org/wiki/PDF][PDF]] file after excution of
the ~org-latex-export-latex-to-latex~ command in this buffer.

[[info:emacs#Top][Emacs (info)]]


Here follows a list of interesting Emacs configurations:
1. [[https://github.com/oantolin/emacs-config][Omar Antolín Camarena's configuration]]
2. [[https://gitlab.com/ambrevar/dotfiles][Pierre Neirhardt's configuration]] implements lazy loading without help of
   external packages.  I have stolen his approach of using lazy loading to
   silently ignore the setup stanzas of uninstalled extension packages.
3. [[https://sachachua.com/dotemacs/][Sacha Chua's configuration]] is an example of producing the Emacs
   initialization files by tangling an [[info:org#Top][org]] file.  It gives me the impression
   that she is a very practical person trying to achieve her goals by the most
   efficient means.  I have stolen her idea of using [[https://github.com/quelpa/quelpa][quelpa]] to install packages
   from any source.
4. [[https://github.com/purcell/emacs.d][Steve Purcell's configuration]] is well organized and a show-case of readable
   [[info:elisp#Top][Emacs lisp (info)]] code.  I have stolen his idea of versioning the
   ~package-user-dir~ variable to prevent clashes between the byte-compiler
   output of different Emacs versions.
5. [[https://github.com/tecosaur/emacs-config][Timothy E. Chapman]]

* [[info:emacs#Early Init File][Early Init File (info)]]
:PROPERTIES:
:CUSTOM_ID: sec:early-init-file
:END:

The err
[[#sec:package-bootstrapping][Package Bootstrapping]]

The [[info:elisp#Basic Char Syntax][Basic Char Syntax (info)]] page

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp :tangle early-init.el
  ;;; early-init.el --- user early-init file        -*- lexical-binding: t -*-
  ;;; Commentary:
  ;;; Code:
  (setq package-enable-at-startup nil)
  (setq-default load-prefer-newer t)

  (provide 'early-init)
  ;; Emacs looks for "Local variables:" after the last "?\n?\f".
  
  ;; Local Variables:
  ;; indent-tabs-mode: nil
  ;; End:
  ;;; earl-init.el ends here
#+end_src

* [[info:emacs#Init File][Init File (info)]] header
:PROPERTIES:
:CUSTOM_ID: sec:init-file-header
:END:

The [[info:elisp#Quoting][quoting (info)]] and the [[info:elisp#Backquote][backquote (info)]] pages explain how to understand the
reader macros ~'~ (quote), ~`~ (backquote), ~,~ (substitute) and ~@,~ (splice)
in the ~custom-set-variable~ function call below.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;;; init.el --- user init file                    -*- lexical-binding: t -*-
  ;;; Commentary:
  ;;; Code:
  (require 'cl-lib)

  ;; https://with-emacs.com/posts/tutorials/almost-all-you-need-to-know-about-variables/
  (defmacro csetq (sym val)
    `(funcall (or (get ',sym 'custom-set) 'set-default) ',sym ,val))

  (custom-set-variables
   '(after-save-hook #'executable-make-buffer-file-executable-if-script-p)
   '(column-number-mode t)
   '(cursor-type 'box)
   `(custom-file
     ,(locate-user-emacs-file
       (format "custom-%s.%s.el" emacs-major-version emacs-minor-version)))
   '(epg-pinentry-mode 'loopback)
   '(global-hl-line-mode t)
   '(global-hl-line-sticky-flag t)
   '(history-delete-duplicates t)
   '(history-length 500)
   '(indent-tabs-mode nil)
   '(inhibit-startup-buffer-menu t)
   '(inhibit-startup-screen t)
   '(initial-buffer-choice t)
   '(initial-scratch-message "")
   `(insert-directory-program ,(or (executable-find "gls")
                                   (executable-find "ls")))
   '(kill-ring-max 300)
   '(package-archive-priorities '(("gnu" . 1)
                                  ("nongnu" . 1)))
   '(package-archives '(("gnu" . "https://elpa.gnu.org/packages/")
                        ("nongnu" . "https://elpa.nongnu.org/nongnu/")
                        ("melpa" . "https://melpa.org/packages/")))
   `(package-user-dir
     ,(locate-user-emacs-file
       (format "elpa-%s.%s" emacs-major-version emacs-minor-version)))
   '(python-indent-guess-indent-offset nil)
   '(recentf-mode t)
   '(save-place-mode t)
   '(savehist-additional-variables
     '(eww-history
       kill-ring
       regexp-search-string
       search-ring
       search-string))
   '(savehist-mode t)
   '(savehist-save-minibuffer-history 1)
   '(scroll-bar-mode nil)
   '(tab-always-indent 'complete)
   '(tab-width 8)
   '(tool-bar-mode nil)
   '(url-cookie-trusted-urls nil)
   '(url-cookie-untrusted-urls '(".*"))
   '(use-dialog-box nil)
   '(use-short-answer t)
   '(view-read-only t))

  (when (eq system-type 'darwin)
    (custom-set-variables
     '(ns-alternate-modifier nil)
     '(ns-command-modifier 'meta)
     '(ns-right-command-modifier 'super)))

  (when (eq window-system 'ns)
    (add-to-list 'initial-frame-alist '(height . 51))
    (add-to-list 'initial-frame-alist '(width . 180)))
#+end_src

* Package bootstrapping
:PROPERTIES:
:CUSTOM_ID: sec:package-bootstrapping
:END:

[[info:emacs#Package Installation][Emacs installs packages]] from archives on the internet.
This setup uses three  archives in two decreasing levels of priority:
1. The [[https://elpa.gnu.org/][GNU Emacs Lisp Package Archive]] or the [[https://elpa.nongnu.org/][NonGNU Emacs Lisp Package Archive]].
3. The [[https://melpa.org/#/][MELPA - Milkypostman’s Emacs Lisp Package Archive]].
Finally, the [[https://github.com/quelpa/quelpa][quelpa]] tool allows to fetch code from any source and build a
package on your computer before installation. It allows to install a package
from [[https://melpa.org/#/][MELPA]] instead of [[https://elpa.gnu.org/][GNU ELPA]] or [[https://elpa.nongnu.org/][NonGNU ELPA]], breaking the priority order.

The output of the byte-compiler may change with each new Emacs release.
Therefore, in order to prevent collisions between different Emacs versions, the
package-user-directory has a suffix containing the major- and minor-version
numbers of Emacs.

The order of the next 1nd, 2nd, and 3rd package-bootstrapping blocks matters
because each of those blocks prepares Emacs for the next block.

If present, the package [[https://github.com/emacscollective/no-littering][no-littering]] helps to keep =~/.emacs.d= clean.

The code assumes that the package system is in a *virgin* state in case the
package [[https://github.com/emacscollective/no-littering][no-littering]] is not present.  Refreshing the contents of available
packages at least once is a requirement in order to be able to install and load
any packages, hence also [[https://github.com/emacscollective/no-littering][no-littering]].

You have to refresh the list of available packages yourself before updating
the installed packages.

Finally, ~my-install-packages~ ensures installation of all packages in a list of
packages.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;; The is the 1st package bootstrapping block.
  (require 'package)
  (package-initialize)

  (unless (require 'no-littering nil 'noerror)
    (package-refresh-contents)
    (package-install 'no-littering)
    (require 'no-littering))

  (defun my-install-packages (packages)
    "Ensure installation of all packages in PACKAGES."
    (dolist (package packages)
      (unless (package-installed-p package)
        (package-install package))))
#+end_src

Install the basic packages and in case this is Emacs-27.2, upgrade [[https://orgmode.org/][Org Mode]] for
compatibility with Emacs-28.1.  The [[info:elisp#Backquote][info:backquote]] page explains how to read the
~`~ and ~,@~ in the definition of ~my-packages~ variable below.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;; The is the 2nd package bootstrapping block.
  (defvar my-packages
    `(
      ,@(when (version< emacs-version "28.0")
          '(org))                 ; plain text thought organizer
      auctex                      ; Aalborg University Center TeX
      blacken                     ; Black Python-code formatter client
      citar                       ; bibliography handling
      citeproc                    ; bibliography handling
      consult                     ; consult completing-read
      ;; eglot                       ; Emacs polyGLOT LSP client
      elpy                        ; Python development environment
      embark                      ; act on any buffer selection
      htmlize                     ; convert buffer contents to HTML
      leuven-theme                ; beautiful color theme
      ;; lsp-mode                   ; Language Server Protocol client
      marginalia                  ; minibuffer margin notes
      orderless                   ; Emacs completion style
      pdf-tools                   ; interactive docview replacement
      pyenv-mode                  ; Python environment selector
      quelpa                      ; install Emacs packages from source
      vertico)                    ; VERTical Interactive Completion
    "List of packages required packages.")

  (my-install-packages my-packages)
#+end_src

Install the following packages with [[https://github.com/quelpa/quelpa][quelpa]]:
1. ~lisp-ui~ (including ~lisp-mode~), because ~lisp-ui~ is yet available from
   [[https://elpa.gnu.org/][GNU ELPA]], [[https://elpa.nongnu.org/][NonGNU ELPA]], or [[https://melpa.org/#/][MELPA]].
2. ~eglot~ to get the latest version from [[https://melpa.org/#/][MELPA]].

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;; This is the 3rd package bootstrapping block.
  (when (package-installed-p 'quelpa)
    (defun my-install-sources (sources)
      (mapc (lambda (source)
              (unless (package-installed-p (car source))
                (quelpa source)))
            sources))
    (my-install-sources
     '((lsp-ui :fetcher github :repo "emacs-lsp/lsp-ui")
       (eglot :fetcher github :repo "joaotavora/eglot"))))
#+end_src

Install the optional packages.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;; The is the 4th package bootstrapping block.
  (defvar my-optional-packages
    `(
      ,@(when (version< emacs-version "28.0")
	  '(modus-themes))        ; high foreground/background contrast themes
      async                       ; asynchroneous processing
      company                     ; complete anything
      electric-operator           ; automatic spacing around operators
      elfeed                      ; web feed reader
      emms                        ; Emacs Multi-Media System
      iedit                       ; simultaneous multi-entity editing
      laas                        ; LaTeX Auto-Activating Snippets
      magit                       ; Git Text-based User Interface
      nov                         ; EPUB reader
      smartparens                 ; smart editing of character pairs
      wgrep                       ; open a writable grep buffer
      which-key                   ; on the fly key-binding help
      wordnut                     ; WordNet lexical database
      writegood-mode              ; bullshit and weasel-word detector
      ws-butler                   ; remove trailing whitespace
      xr                          ; undo rx to grok regular expressions
      yasnippet))                 ; code or text template expansion

  (defun my-install-optional-packages ()
    (interactive)
    (my-install-packages my-optional-packages))
#+end_src

* [[info:emacs#Emacs Server][Emacs Server (info)]]

Emacs can act as a server that listens to a socket to share its state (for
instance buffers and command history) with other programs by means of a shell
command =emacsclient=.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (when window-system
    (unless (or noninteractive (daemonp))
      (add-hook 'after-init-hook #'server-start)))
#+end_src

** LaTeX compile-display-loop
:PROPERTIES:
:CUSTOM_ID: sec:latex-compile-display-loop
:END:

The =latexmk= resource file in the next source code block shows how to use
=emacsclient= to (re)display the PDF file in Emacs after each succesful
(re)compilation on condition that the settings of the ~compile-command~ local
variable in section are compatible.  The local variable ~compile-command~ in
section [[#sec:local-variables][Local Variables]] (only visible in =org= files, but not in =html= and
=pdf= files) shows how to use the =latexmkrc= file..

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src perl :tangle latexmkrc :comments none
  # pdf previewer and update pdf previewer
  $pdf_previewer = "emacsclient -e '(find-file-other-window %S)'";
  $pdf_update_method = 4;  # 4 runs a command to force the update
  $pdf_update_command = "emacsclient -e '(with-current-buffer (find-buffer-visiting %S) (pdf-view-revert-buffer nil t))'";
  # see for instance glossary.latexmkrc
  add_cus_dep( 'acn', 'acr', 0, 'makeglossaries' );
  add_cus_dep( 'glo', 'gls', 0, 'makeglossaries' );
  $clean_ext .= " acr acn alg bbl glo gls glg ist run.xml";
  sub makeglossaries {
      my ($name, $path) = fileparse( $$Psource );
      return system "makeglossaries -d '$path' '$name'";
  }
  # Emacs looks for "Local variables:" after the last "?\n?\f".
  
  # Local Variables:
  # mode: perl
  # End:
#+end_src

** [[https://qutebrowser.org/doc/userscripts.html][Qutebrowser userscript]]

The next block contains an userscript that sends a [[info:org#The store-link protocol][store-link org-protocol]]
message with the url and the title from [[https://qutebrowser.org][qutebrowser]] to =emacsclient=.  The
function =urlencode= translates the url and the title for the message. The
[[info:python#Examples<22>][Python urllib examples]] show how to use =urlencode=.  The final =execvp= call
deals with a [[https://qutebrowser.org][qutebrowser]] userscript requirement: the =emacsclient= process must
get the PID of the userscript that must kill itself after the take-over.
Termination of the =emacsclient= process hands control back to [[https://qutebrowser.org][qutebrowser]].

On a [[https://en.wikipedia.org/wiki/POSIX][POSIX]] system, you can run the userscript from [[https://qutebrowser.org][qutebrowser]] or from a
terminal to see whether it works.  In case you try to run it from Emacs, Emacs
may hang or die.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+header: :comments none
#+header: :tangle-mode (identity #o755)
#+begin_src python :noeval :tangle org-store-link
  #!/usr/bin/env python
  from urllib.parse import urlencode
  from os import environ, execvp

  url = environ.get("QUTE_URL", "https://orgmode.org")
  title = environ.get("QUTE_TITLE", "Org Mode")
  parameters = urlencode({"url": url, "title": title})
  print(payload := f"org-protocol://store-link?{parameters}")
  execvp("emacsclient", ("-n", payload))
#+end_src

* Completion
:PROPERTIES:
:CUSTOM_ID: sec:completion
:END:

[[info:vertico#Top][Vertico (info)]] provides a performant and minimalistic vertical completion UI
based on the default completion system and behaves therefore correctly under all
circumstances.  Vertico integrates well with fully supported complementary
packages to enrich the completion UI:
1. [[info:marginalia#Top][Marginalia (info)]] for rich annotations in the minibuffer.
2. [[info:consult#Top][Consult (info)]] for useful search and navigation commands.
3. [[info:embark#Top][Embark (info)]] for minibuffer actions with context menus.
4. [[info:orderless#Top][Orderless (info)]] for an advanced completion style.

[[https://cestlaz.github.io/post/using-emacs-80-vertico/][Using Vertico, Marginalia, Consult, and Embark]]

[[info:vertico#Configuration][Vertico configuration (link)]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (fboundp 'vertico-mode)
      (vertico-mode +1)))
#+end_src

[[info:marginalia#Top][Marginalia (info)]] adds marginalia (margin annotations) to minibuffer
completions.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (fboundp 'marginalia-mode)
      (marginalia-mode +1)))
#+end_src

Consult provides practical commands based on the Emacs completion
function.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (fboundp 'consult-apropos)
      (custom-set-variables
       '(consult-project-root-function #'vc-root-dir))
      ;; C-c bindings (mode-specific-map)
      (global-set-key (kbd "C-c h") #'consult-history)
      (global-set-key (kbd "C-c m") #'consult-mode-command)
      ;; C-x bindings (ctl-x-map)
      (global-set-key (kbd "C-x M-:") #'consult-complex-command)
      (global-set-key (kbd "C-x b") #'consult-buffer)
      (global-set-key (kbd "C-x 4 b") #'consult-buffer-other-window)
      (global-set-key (kbd "C-x 5 b") #'consult-buffer-other-frame)
      (global-set-key (kbd "C-x r x") #'consult-register)
      (global-set-key (kbd "C-x r b") #'consult-bookmark)
      ;; M-g bindings (goto-map)
      (global-set-key (kbd "M-g g") #'consult-goto-line)
      (global-set-key (kbd "M-g M-g") #'consult-goto-line)
      (global-set-key (kbd "M-g o") #'consult-outline)
      (global-set-key (kbd "M-g m") #'consult-mark)
      (global-set-key (kbd "M-g k") #'consult-global-mark)
      (global-set-key (kbd "M-g i") #'consult-imenu-project)
      (global-set-key (kbd "M-g e") #'consult-error)
      ;; M-s bindings (search-map)
      (global-set-key (kbd "M-s g") #'consult-git-grep)
      (global-set-key (kbd "M-s f") #'consult-find)
      (global-set-key (kbd "M-s k") #'consult-keep-lines)
      (global-set-key (kbd "M-s l") #'consult-line)
      (global-set-key (kbd "M-s m") #'consult-multi-occur)
      (global-set-key (kbd "M-s u") #'consult-focus-lines)
      ;; Other bindings
      (global-set-key (kbd "M-y") #'consult-yank-pop)
      (global-set-key (kbd "<help> a") #'consult-apropos)
      ;; Tweak functions
      (advice-add 'completing-read-multiple
                  :override #'consult-completing-read-multiple)
      (fset 'multi-occur #'consult-multi-occur)))
#+end_src


#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (cl-every #'fboundp '(embark-act embark-bindings embark-dwim))
      (global-set-key (kbd "C-,") #'embark-act)
      (global-set-key (kbd "C-:") #'embark-dwim)
      (global-set-key (kbd "C-h B") #'embark-bindings)))
#+end_src

[[info:orderless#Top][Orderless (info)]]

#+begin_src emacs-lisp
  (unless noninteractive
    (when (fboundp 'orderless-filter)
      (custom-set-variables
       ;; https://github.com/purcell/emacs.d/issues/778
       '(completion-styles '(basic completion-partial orderless))
       '(completion-category-defaults nil)
       '(completion-category-overrides
         '((file (styles partial-completion)))))
      (add-hook 'minibuffer-setup-hook
                (defun my-on-minibuffer-setup-hook()
                  (setq-default completion-styles '(substring orderless))))))
#+end_src

[[https://company-mode.github.io/][company-mode: modular in-buffer completion framework for Emacs]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (fboundp 'company-mode)
      (custom-set-variables
       ;; https://github.com/purcell/emacs.d/issues/778
       '(company-transformers '(company-sort-by-occurrence)))
      (dolist (hook '(LaTeX-mode-hook
                      org-mode-hook
                      emacs-lisp-mode-hook
                      lisp-interaction-mode-hook
                      python-mode-hook
                      ielm-mode-hook))
        (add-hook hook #'company-mode))))
#+end_src

* Reading

** EPUB files

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (when (fboundp 'nov-mode)
    (add-to-list 'auto-mode-alist `(,(rx ".epub" eos) . nov-mode)))
#+end_src

** PDF files

The [[https://github.com/vedang/pdf-tools][pdf-tools]] package exploits the [[https://github.com/freedesktop/poppler][poppler]] library to render and to let you
annotate [[https://en.wikipedia.org/wiki/PDF][PDF]] files.  It also exploits the [[https://wiki.contextgarden.net/SyncTeX][SyncTeX]] library to link anchors in [[https://en.wikipedia.org/wiki/PDF][PDF]]
files produced with LaTeX to the original LaTeX sources.

In order to use [[https://github.com/vedang/pdf-tools][pdf-tools]], you have to type =M-x pdf-tools-install= after
installation of [[https://github.com/vedang/pdf-tools][pdf-tools]] from [[https://melpa.org/][MELPA]] or after each update of [[https://github.com/freedesktop/poppler][poppler]] to build
or rebuild the =epdfinfo= executable that serves the [[https://en.wikipedia.org/wiki/PDF][PDF]] files to Emacs.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (when (fboundp 'pdf-tools-install)
    (autoload 'pdf-view-mode "pdf-view")
    (add-to-list 'magic-mode-alist '("%PDF" . pdf-view-mode)))
#+end_src

* Writing

** LaTeX

Loading =tex.el= immediately instead of lazily ensures proper initialization of
the [[https://en.wikipedia.org/wiki/AUCTeX][AUCTeX]].  For instance, the ~TeX-master~ safe local variable in the =tex.el=
elisp library file has no autoload cookie.  Without prior loading of =tex.el=,
Emacs will complain that ~TeX-master~ is no safe local variable in case it
reads a LaTeX file that sets ~TeX-master~.

Out of the box, [[https://en.wikipedia.org/wiki/AUCTeX][AUCTeX]] does not indent text between square brackets.  The code
below corrects this by advising to override ~TeX-brace-count-line~ with
~my-TeX-brace-count-line~.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;; Try to get the `safe-local-variable` predicate for `TeX-master`
  (when (require 'tex nil 'noerror)
    ;; https://emacs.stackexchange.com/questions/17396/indentation-in-square-brackets
    (defun my-TeX-brace-count-line ()
      "Count number of open/closed braces."
      (save-excursion
        (let ((count 0) (limit (line-end-position)) char)
          (while (progn
                   (skip-chars-forward "^{}[]\\\\" limit)
                   (when (and (< (point) limit) (not (TeX-in-comment)))
                     (setq char (char-after))
                     (forward-char)
                     (cond ((eq char ?\{)
                            (setq count (+ count TeX-brace-indent-level)))
                           ((eq char ?\})
                            (setq count (- count TeX-brace-indent-level)))
                           ((eq char ?\[)
                            (setq count (+ count TeX-brace-indent-level)))
                           ((eq char ?\])
                            (setq count (- count TeX-brace-indent-level)))
                           ((eq char ?\\)
                            (when (< (point) limit)
                              (forward-char) t))))))
          count)))
    (advice-add 'TeX-brace-count-line :override #'my-TeX-brace-count-line))
#+end_src

** Org-mode

*** [[info:org#Activation][Activation (info)]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  ;; Inspect:
  ;; function with "C-h f"
  ;; symbols with "C-h o"
  ;; variables with "C-h v"

  (global-set-key (kbd "C-c a") #'org-agenda)
  (global-set-key (kbd "C-c c") #'org-capture)
  (global-set-key (kbd "C-c l") #'org-store-link)
  (global-set-key (kbd "C-c C-l") #'org-insert-link-global)
#+end_src

*** Customization

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (custom-set-variables
   '(org-babel-python-command "python -E")
   '(org-babel-load-languages '((C . t)
                                (calc . t)
                                (dot . t)
                                (emacs-lisp . t)
                                (eshell . t)
                                (fortran . t)
                                (gnuplot . t)
                                (latex . t)
                                (lisp . t)
                                (maxima . t)
                                (org . t)
                                (perl . t)
                                (python . t)
                                (scheme . t)
                                (shell . t)))
   '(org-cite-export-processors '((latex biblatex)
                                  (t csl)))
   '(org-cite-global-bibliography '("~/VCS/research/refs.bib"))
   '(org-file-apps '((auto-mode . emacs)
                     (directory . emacs)
                     ("\\.mm\\'" . default)
                     ("\\.x?html?\\'" . default)
                     ("\\.pdf\\'" . emacs)))
   '(org-confirm-babel-evaluate nil)
   '(org-latex-compiler "lualatex")
   '(org-latex-hyperref-template nil)
   '(org-latex-listings 'minted)
   '(org-latex-logfiles-extensions '("blg" "lof" "log" "lot" "out" "toc"))
   '(org-latex-prefer-user-labels t)
   '(org-modules '(ol-bibtex
                   ol-doi
                   ol-eww
                   ol-info
                   org-id
                   org-protocol
                   org-tempo))
   '(org-src-fontify-natively t)
   '(org-src-window-setup 'current-window)
   '(org-structure-template-alist
           '(("a" . "export ascii")
             ("c" . "center")
             ("C" . "comment")
             ("e" . "example")
             ("E" . "export")
             ("h" . "export html")
             ("l" . "export latex")
             ("q" . "quote")
             ("s" . "src")
             ("p" . "src python :session :async")
             ("v" . "verse"))))
#+end_src

*** [[info:org#Citation export processors][Citation export processors (info)]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (with-eval-after-load 'oc
    (require 'oc-biblatex)
    (require 'oc-csl))
#+end_src

*** [[https://tecosaur.github.io/emacs-config/#translate-capital-keywords][Translate capital keywords (old) to lower case (new)]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (with-eval-after-load 'org
    (defun org-syntax-convert-keyword-case-to-lower ()
      "Convert all #+KEYWORDS to #+keywords."
      (interactive)
      (save-excursion
        (goto-char (point-min))
        (let ((count 0)
              (case-fold-search nil))
          (while (re-search-forward "^[ \t]*#\\+[A-Z_]+" nil t)
            (unless (s-matches-p "RESULTS" (match-string 0))
              (replace-match (downcase (match-string 0)) t)
              (setq count (1+ count))))
          (message "Replaced %d keywords" count)))))
#+end_src

*** [[info:org#Advanced Export Configuration][Advanced Export Configuration (info)]]

Stolen from [[https://git.sr.ht/~bzg/org-contrib/tree/master/item/lisp/ox-extra.el][ox-extra.el]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (with-eval-after-load 'ox
    (defun my-org-export-ignore-headline-filter (_)
      "Ignore all headlines with the \":ignore:\" tag."
      (org-map-entries
       (lambda ()
         (delete-region (point) (line-beginning-position 2)))
       ":ignore:"))

    (defun my-org-latex-header-blocks-filter (backend)
      "Convert marked LaTeX export blocks to \"#+latex_header: \" lines.
  The marker is a line \"#+header: :header yes\" preceding the block.

  For instance, the LaTeX export block

  ,#+header: :header yes
  ,#+begin_export latex
  % This line converts to a LaTeX header line.
  ,#+end_export

  converts to

  \"#+latex_header: % This line converts to a LaTeX header line.\"."
      (when (org-export-derived-backend-p backend 'latex)
        (let ((blocks
               (org-element-map
                   (org-element-parse-buffer 'greater-element nil) 'export-block
                 (lambda (block)
                   (let ((type (org-element-property :type block))
                         (header (org-export-read-attribute :header block :header)))
                     (when (and (string= type "LATEX") (string= header "yes"))
                       block))))))
          ;; Set point to where to insert LaTeX header lines after
          ;; deleting the block.
          (mapc (lambda (block)
                  (goto-char (org-element-property :post-affiliated block))
                  (let ((lines
                         (split-string (org-element-property :value block) "\n")))
                    (delete-region (org-element-property :begin block)
                                   (org-element-property :end block))
                    (dolist (line lines)
                      (insert (concat "#+latex_header: "
                                      (replace-regexp-in-string "\\` *" "" line)
                                      "\n")))))
                ;; Reverse to go upwards to avoid wrecking the numeric
                ;; positions earlier in the file.
                (reverse blocks)))))

    (defun my-activate-buffer-local-org-export-filters ()
      "Activate my export filters locally in the current buffer."
      (add-hook 'org-export-before-parsing-hook
                #'my-org-export-ignore-headline-filter nil 'local)
      (add-hook 'org-export-before-parsing-hook
                #'my-org-latex-header-blocks-filter nil 'local)))
#+end_src

#+name: emacs-lisp-setup
#+begin_src emacs-lisp :tangle no
  (with-eval-after-load 'ox
    (my-activate-buffer-local-org-export-filters))
#+end_src

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (with-eval-after-load 'ox-latex
    (mapc (lambda (item)
            (add-to-list 'org-latex-classes item))
          '(;; The postfixes +1, +2, +3, -1, -2, and -3 denote:
            ;; +1 => [DEFAULT-PACKAGES]
            ;; +2 => [PACKAGES]
            ;; +3 => [EXTRA]
            ;; -1 => [NO-DEFAULT-PACKAGES]
            ;; -2 => [NO-PACKAGES]
            ;; -3 => [NO-EXTRA]
            ("elsarticle-1+2+3"	; Elsevier journals
             "\\documentclass{elsarticle}
  [NO-DEFAULT-PACKAGES]
  [PACKAGES]
  [EXTRA]"
             ("\\section{%s}" . "\\section*{%s}")
             ("\\subsection{%s}" . "\\subsection*{%s}")
             ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
             ("\\paragraph{%s}" . "\\paragraph*{%s}")
             ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
            ("article-1+2+3"
             "\\documentclass{article}
  [NO-DEFAULT-PACKAGES]
  [PACKAGES]
  [EXTRA]"
             ("\\section{%s}" . "\\section*{%s}")
             ("\\subsection{%s}" . "\\subsection*{%s}")
             ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
             ("\\paragraph{%s}" . "\\paragraph*{%s}")
             ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
            ("report-1+2+3"
             "\\documentclass[11pt]{report}
  [NO-DEFAULT-PACKAGES]
  [PACKAGES]
  [EXTRA]"
             ("\\part{%s}" . "\\part*{%s}")
             ("\\chapter{%s}" . "\\chapter*{%s}")
             ("\\section{%s}" . "\\section*{%s}")
             ("\\subsection{%s}" . "\\subsection*{%s}")
             ("\\subsubsection{%s}" . "\\subsubsection*{%s}"))
            ("book-1+2+3"
             "\\documentclass[11pt]{book}
  [NO-DEFAULT-PACKAGES]
  [PACKAGES]
  [EXTRA]"
             ("\\part{%s}" . "\\part*{%s}")
             ("\\chapter{%s}" . "\\chapter*{%s}")
             ("\\section{%s}" . "\\section*{%s}")
             ("\\subsection{%s}" . "\\subsection*{%s}")
             ("\\subsubsection{%s}" . "\\subsubsection*{%s}")))))
#+end_src

*** Evaluate source blocks on loading

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (defun my-org-eval-blocks-named (name)
    "Evaluate all source blocks named NAME."
    (when (eq major-mode 'org-mode)
      (let ((blocks
             (org-element-map
                 (org-element-parse-buffer 'greater-element nil) 'src-block
               (lambda (block)
                 (when (string= name (org-element-property :name block))
                   block)))))
        (dolist (block blocks)
          (goto-char (org-element-property :begin block))
          (org-babel-execute-src-block)))))

  ;; Emacs looks for "Local variables:" after the last "?\n?\f".
  (add-to-list 'safe-local-eval-forms
               '(apply 'my-org-eval-blocks-named '("emacs-lisp-setup")))
  (add-to-list 'safe-local-eval-forms
               '(apply 'my-org-eval-blocks-named '("python-setup")))
#+end_src

** Citing bibliography
:PROPERTIES:
:CUSTOM_ID: sec:citing-bibliography
:END:

[[https://github.com/bdarcus/citar][Citar]] provides a completing-read front-end to browse and act on BibTeX,
BibLaTeX, and CSL JSON bibliographic data, and LaTeX, markdown, and org-cite
editing support.

[[https://github.com/bdarcus/citar][Citar]] -- in combination with vertico, embark, and marginalia -- provides quick
filtering and selecting of bibliographic entries from the minibuffer, and the
option to run different commands on those selections.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (when (cl-every #'fboundp '(citar-insert-citation
                              citar-insert-preset
                              citar-org-activate
                              citar-org-follow
                              citar-org-insert))
    (custom-set-variables
     '(org-cite-activate-processor 'citar)
     '(org-cite-follow-processor 'citar)
     '(org-cite-insert-processor 'citar))
    (global-set-key (kbd "C-c b") #'citar-insert-citation)
    (define-key minibuffer-local-map (kbd "M-b") #'citar-insert-preset))
#+end_src

* Editing

** Synchronal multiple-region editing

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (require 'iedit nil 'noerror))
#+end_src

** Extraneous whitespace trimming

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (require 'ws-butler nil 'noerror)
      (custom-set-variables
       '(ws-butler-keep-whitespace-before-point nil))
      (add-hook 'prog-mode-hook #'ws-butler-mode)
      (add-hook 'text-mode-hook #'ws-butler-mode)))
#+end_src

** Smart character-pair handling

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    (when (require 'smartparens-config nil 'noerror)
      ;; Requiring smartparens-config disables pairing of the quote
      ;; character for lisp modes, contrary to requiring smartparens.
      (custom-set-variables
       '(sp-base-key-bindings 'sp)
       '(sp-override-key-bindings '(("C-(" . sp-backward-barf-sexp)
                                    ("C-)" . sp-forward-slurp-sexp))))

      (add-hook 'LaTeX-mode-hook #'turn-off-smartparens-mode)
      (add-hook 'prog-mode-hook #'turn-on-smartparens-mode)
      (add-hook 'text-mode-hook #'turn-on-smartparens-mode)

      (add-hook 'emacs-lisp-mode-hook #'turn-on-smartparens-strict-mode)
      (add-hook 'ielm-mode-hook #'turn-on-smartparens-strict-mode)
      (add-hook 'python-mode-hook #'turn-on-smartparens-strict-mode)

      ;; https://xenodium.com/emacs-smartparens-auto-indent/index.html
      (defun indent-between-pair (&rest _ignored)
        (newline)
        (indent-according-to-mode)
        (forward-line -1)
        (indent-according-to-mode))

      (sp-local-pair 'prog-mode "(" nil :post-handlers '((indent-between-pair "RET")))
      (sp-local-pair 'prog-mode "[" nil :post-handlers '((indent-between-pair "RET")))
      (sp-local-pair 'prog-mode "{" nil :post-handlers '((indent-between-pair "RET")))

      (show-smartparens-global-mode +1)))
#+end_src

** Operators

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (when (fboundp 'electric-operator-mode)
    (add-hook 'c-mode-common #'electric-operator-mode)
    (add-hook 'python-mode-hook #'electric-operator-mode))
#+end_src

** Smart snippets

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (when (require 'yasnippet nil 'noerror)
    (custom-set-variables
     '(yas-alias-to-yas/prefix-p nil))
    (yas-global-mode +1))
#+end_src

* Coding

#+begin_src emacs-lisp
  (with-eval-after-load 'eglot
    (add-to-list 'eglot-server-programs '(python-mode "pylsp")))
#+end_src

** Python coding

Here, the focus is on three ways to extend Emacs's built-in ~python-mode~ out of
the options listed on the [[https://www.emacswiki.org/emacs/PythonProgrammingInEmacs][Python Programming in Emacs]] wiki page:
1. [[https://elpy.readthedocs.io/en/latest/][Elpy]] is an opinionated Python integrated development environment with its own
   Python server and its own server protocol.  Its main disadvantages are:
   1. It requires a high number of Elisp and Python packages.
   2. It imposes its way making it hard to do otherwise for beginners.
   3. It requires a new maintainer, because the current maintainer has no time
      anymore for adding new features or squashing hard bugs.
   Its main advantages are:
   1. Its usability out of the box.
   2. Its documentation quality.
   3. Its compatibility with the Org source block editing mode.
2. [[https://emacs-lsp.github.io/lsp-mode/][LSP Mode - Language Server Protocol support for Emacs]] with its [[https://emacs-lsp.github.io/lsp-ui/][LSP-UI]] user
   interface extensions.  According to [[https://github.com/emacs-lsp/lsp-mode/blob/master/docs/manual-language-docs/lsp-org.md][Literate programming using LSP and
   org-mode(alpha)]], this package tries to be compatible with the Org source
   block editing mode, but it is not ready for daily usage.
3. [[https://github.com/joaotavora/eglot][Eglot - Emacs polyGLOT: an Emacs LSP client that stays out of your way]].  The
   maintainer also contributes to Emacs itself and has a deep understanding of
   [[https://sheer.tj/the_way_of_emacs.html][the Way of Emacs]].  He refuses to add new features without seeing how they fit
   into [[https://sheer.tj/the_way_of_emacs.html][the Way of Emacs]] as this discussion at [[https://github.com/joaotavora/eglot/issues/523][Eglot github issue: org-mode
   source code blocks]] shows.

[[https://emacs.stackexchange.com/questions/45164/does-org-have-any-inverse-tangle-operations-e-g-for-collaborating-with-non-or][Does org have any "inverse-tangle" operations e.g. for collaborating with non-org users?]]

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src python :tangle example.py :comments link
  import numpy
  import astropy.units as apu

  a = numpy.linspace(0, 10, num=11)
  q = apu.Quantity(a, apu.meter)
  print(q)
#+end_src

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (custom-set-variables
   '(python-shell-interpreter-args "-i -E"))
  (when (and (executable-find "pyenv")
             (require 'pyenv-mode nil 'noerror))
   (pyenv-mode +1)
   (pyenv-mode-set "3.9.8/envs/python-3.9.8"))
#+end_src

#+begin_src emacs-lisp
  (when (fboundp 'elpy-enable)
    (custom-set-variables
     '(elpy-modules '(elpy-module-sane-defaults
                      elpy-module-company
                      elpy-module-eldoc
                      elpy-module-pyvenv))
     '(elpy-project-root-finder-functions '(elpy-project-find-python-root
                                            elpy-project-find-git-root
                                            elpy-project-find-hg-root))
     `(elpy-rpc-ignored-buffer-size ,(lsh 1 18))
     '(elpy-rpc-virtualenv-path 'current)))
#+end_src

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (with-eval-after-load 'info
    (add-to-list 'Info-directory-list
                 (expand-file-name "~/.local/share/info")))
#+end_src

Look into:
1. [[https://github.com/douglasdavis/numpydoc.el/blob/main/numpydoc.el][Emacs extension to insert numpy style docstrings in function definitions]]

* Appearance

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    ;; Set face attributes.
    (cond
     ((eq system-type 'darwin)
      (set-face-attribute 'default nil :family "Hack" :height 120)
      (set-face-attribute 'fixed-pitch nil :family "Hack")
      (set-face-attribute 'variable-pitch nil :family "FiraGo"))
     ((eq system-type 'gnu/linux)
      (set-face-attribute 'default nil :family "Hack" :height 110)
      (set-face-attribute 'fixed-pitch nil :family "Hack")
      (set-face-attribute 'variable-pitch nil :family "FiraGo"))
     (t
      (set-face-attribute 'default nil :family "Hack" :height 110)
      (set-face-attribute 'fixed-pitch nil :family "Hack")
      (set-face-attribute 'variable-pitch nil :family "DejaVu Sans"))))
#+end_src

This setup prefers the ~leuven~ and ~leuven-dark~ themes from [[https://melpa.org/#/][MELPA]], because the
very popular ~modus-operandi~ and ~modus-vivendi~ themes feel quirky: for
instance those themes fail to display ~hl-line-mode~ with Emacs-27.2 on Darwin.

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    ;; Try to detect `leuven-theme` from MELPA.
    (when (fboundp 'leuven-scale-font)
      (custom-set-variables
       '(leuven-scale-org-agenda-structure nil)
       '(leuven-scale-org-document-title nil)
       '(leuven-scale-outline-headlines nil)
       '(leuven-scale-volatile-highlight nil)))
    (load-theme 'leuven 'no-confirm nil))
#+end_src

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp :tangle no
  (unless noninteractive
    (custom-set-variables
     '(modus-themes-hl-line 'underline)
     '(modus-themes-intense-markup 't))
    (when (and (version< emacs-version "28.0")
               (require 'modus-themes nil 'noerror))
      (modus-themes-load-themes)))
#+end_src

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (unless noninteractive
    ;; https://karthinks.com/software/batteries-included-with-emacs/
    ;; https://www.reddit.com/r/emacs/comments/jwhr6g/batteries_included_with_emacs/
    (defun my-pulse-one-line (&rest _)
      "Pulse the current line."
      (let ((pulse-iterations 16)
            (pulse-delay 0.1))
        (pulse-momentary-highlight-one-line (point))))
    (dolist (command '(scroll-up-command
                       scroll-down-command
                       recenter-top-bottom
                       other-window))
      (advice-add command :after #'my-pulse-one-line)))
#+end_src

* Applications

** Feed reader

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (autoload 'elfeed "elfeed" nil t)
  (global-set-key (kbd "C-x w") #'elfeed)

  (with-eval-after-load 'elfeed
    (custom-set-variables
     '(elfeed-feeds
       '(("http://www.howardism.org/index.xml" h-abrams)
         ("https://ambrevar.xyz/atom.xml" p-neirhardt)
         ("https://emacshorrors.com/feed.atom" v-schneidermann)
         ("https://emacsninja.com/emacs.atom" v-schneidermann)
         ("https://feeds.feedburner.com/InterceptedWithJeremyScahill" j-scahill)
         ("https://nullprogram.com/feed/" c-wellons)
         ("https://oremacs.com/atom.xml" o-krehel)
         ("https://planet.emacslife.com/atom.xml" planet-emacs)
         ("https://protesilaos.com/codelog.xml" p-stavrou)
         ("https://sachachua.com/blog/category/emacs/feed" s-chua)
         ("https://sciencescitoyennes.org/feed/" sciences)
         ("https://updates.orgmode.org/feed/updates" org-updates)
         ("https://www.aclu.org/taxonomy/feed-term/2152/feed" aclu)
         ("https://www.bof.nl/rss/" bof)
         ("https://www.democracynow.org/podcast-video.xml" dn)
         ("https://www.laquadrature.net/fr/rss.xml" lqdn)
         ("https://www.lemonde.fr/blog/huet/feed/" sciences)))))
#+end_src

** Multi-media system

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (custom-set-variables
   '(emms-mode-line-format "")
   '(emms-player-list '(emms-player-mpd emms-player-mpv))
   `(emms-player-mpd-music-directory ,(expand-file-name "~/Music"))
   '(emms-player-mpd-server-name "localhost")
   '(emms-player-mpd-server-port "6600")
   '(emms-player-mpd-verbose t)
   '(emms-playing-time-display-format " %s ")
   '(emms-playlist-mode-center-when-go t))

  (defun my-emms-print-metadata-find ()
    (require 'find-func)
    (locate-file
     "emms-print-metadata"
     (expand-file-name
      "src"
      (file-name-directory (find-library-name "emms")))
     exec-suffixes #'file-executable-p))

  (with-eval-after-load 'emms
    (require 'emms-info-libtag)
    (let ((emms-print-metadata (my-emms-print-metadata-find)))
      (when emms-print-metadata
        (custom-set-variables
         '(emms-info-functions nil)
         `(emms-info-libtag-program-name ,emms-print-metadata))
        (add-hook 'emms-info-functions #'emms-info-libtag))))

  (with-eval-after-load 'elfeed-show
    (when (require 'emms-setup nil 'noerror)
      (emms-all)))

  (autoload 'emms-streams "emms-streams" nil 'interactive)
  (with-eval-after-load 'emms-streams (emms-all))
#+end_src

* [[info:emacs#Init File][Init File (info)]] footer
:PROPERTIES:
:CUSTOM_ID: sec:init-file-footer
:END:

#+attr_latex: :options bgcolor=LightGoldenrodYellow
#+begin_src emacs-lisp
  (provide 'init)

  ;; Emacs looks for "Local variables:" after the last "?\n?\f".
  
  ;; Local Variables:
  ;; indent-tabs-mode: nil
  ;; End:
  ;;; init.el ends here
#+end_src

* Local variables anchor                                            :ignored:
:PROPERTIES:
:CUSTOM_ID: sec:local-variables
:END:

* Local variables linking back to [[#sec:latex-compile-display-loop][LaTeX compile-display-loop]]       :noexport:

# Emacs looks for "Local variables:" after the last "\?n\?f".

# Local Variables:
# compile-command: "latexmk -interaction=nonstopmode -lualatex -pvc -shell-escape README.tex"
# eval: (apply 'my-org-eval-blocks-named '("emacs-lisp-setup"))
# fill-column: 80
# End: