lang/latex: rewrite README

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#+TITLE: :lang latex
#+TITLE: lang/latex
#+DATE: January 16, 2017
#+SINCE: v1.3
#+STARTUP: inlineimages
* Module Description
* Table of Contents :TOC_3:noexport:
- [[Description][Description]]
- [[Module Flags][Module Flags]]
- [[Plugins][Plugins]]
- [[Features][Features]]
- [[Customization][Customization]]
- [[Specifying the location of a bibtex file & corresponding PDFs][Specifying the location of a bibtex file & corresponding PDFs]]
- [[Changing the PDFs viewer][Changing the PDFs viewer]]
* Description
Provide a helping hand when working with LaTeX documents.
** Feature:
+ Sane defaults
+ Fontification of many popular commands
+ Pretty indentation of wrapped lines using the ~adaptive-wrap~ package
+ Spell checking with ~flyschek~
+ Spell checking with ~flycheck~
+ Change PDF viewer to Okular or ~latex-preview-pane~
+ Bibtex editor
+ Autocompletion using ~company-mode~
+ Ivy or Helm for selecting bibliography
+ Compile your .tex code only once using LatexMk
** Module Flags
+ ~+latexmk~ Use LatexMk instead of LaTeX to compile documents.
** Plugins
+ [[http://www.gnu.org/software/auctex/][auctex]]
+ [[http://elpa.gnu.org/packages/adaptive-wrap.html][adaptive-wrap]]
+ [[https://github.com/jsinglet/latex-preview-pane][latex-preview-pane]]
+ [[https://github.com/tom-tan/auctex-latexmk][auctex-latexmk]]*
+ [[https://github.com/alexeyr/company-auctex][company-auctex]]*
+ [[https://github.com/TheBB/company-reftex][company-reftex]]*
+ [[https://github.com/vspinu/company-math][company-math]]*
+ [[https://github.com/tmalsburg/helm-bibtex][ivy-bibtex]]* or [[https://github.com/tmalsburg/helm-bibtex][helm-bibtex]]*
* TODO Features
* Customization
** Specifying the location of a bibtex file & corresponding PDFs
The reftex and bibtex-completion packages have two variables that allow you to
specify where it should find your bibliography file(s) and their corresponding
PDFs:
** Custom Variables
Two custom variables state where AUCTeX will search for bibliography files and their corresponding PDFs.
Set these variables in your private configuration with:
#+BEGIN_SRC emacs_lisp
(set! :latex-bibtex-file "./your/bib/file.bib")
(set! :latex-bibtex-pdfs-dir "./dir/with/bib/pdfs/")
#+END_SRC
If the variables are not set, they are ignored.
** Choose View Program
You have four options to choose from for the viewer of your PDF rendered files.
*** Okular
Use Okular as default PDF viewer.
Activate with the flag '+okular' of the latex module in your private init.el.
#+BEGIN_SRC emacs_lisp
(latex +okular)
#+BEGIN_SRC emacs-lisp
(setq reftex-default-bibliography "/your/bib/file.bib")
;; Optionally specifying a location for the corresponding PDFs
(setq bibtex-completion-library-path (list "/your/bib/pdfs"))
#+END_SRC
*** Skim
For Mac users. Use Skim to preview your PDFs.
** Changing the PDFs viewer
This module provides integration for four supported pdf viewers. They are
Activate with the flag '+skim' of the latex module in your private init.el.
#+BEGIN_SRC emacs_lisp
(latex +skim)
+ [[https://skim-app.sourceforge.io/][Skim.app]] (MacOS only)
+ Okular
+ Zathura
+ pdf-tools (requires =:tools pdf= module)
They are searched for in this order. See ~+latex-viewers~ to change the order,
or remove tools from the search altogether. If you want to exclusively use one
tool, for instance:
#+BEGIN_SRC emacs-lisp
(setq +latex-viewers '(zathura))
#+END_SRC
*** PDF Tools
Use the PDF Tools package to preview your PDFs. Requires the tools module ~pdf~ enabled in your configuration.
#+BEGIN_SRC emacs_lisp
(:tools pdf)
#+END_SRC
Activate with the flag '+pdf-tools' of the latex module in your private init.el.
#+BEGIN_SRC emacs_lisp
(latex +pdf-tools=)
#+END_SRC
*** Preview Pane
You may wish to use the old school package ~latex-preview-pane~ instead of the
other alternatives. ~latex-preview-pane~ uses a ~DocView~ instead.
Activate with the flag '+preview-pane' of the latex module in your private init.el.
#+BEGIN_SRC emacs_lisp
(latex +preview-pane)
#+END_SRC
** LatexMk
Use LatexMk instead of normal LaTeX to compile documents. LatexMk only needs to
run once to get all references, bibliography and other things right.
Activate with the flag '+latexmk' of the latex module in init.el.
#+BEGIN_SRC emacs_lisp
(latex +latexmk)
#+END_SRC
You can enable both a custom view program and LatexMk with a call such as:
#+BEGIN_SRC emacs_lisp
(latex +latexmk +okular)
#+END_SRC
If none of these tools are found, ~latex-preview-pane~ (uses ~DocView~ in Emacs)
is used as a fallback. You can use this exclusively by setting ~+latex-viewers~
to ~nil~.