emacs: Update mode file

=== Emacs Syntax Highlighting ===

Created by Aidan Thompson 12/2010

===============================

Updated by Roit Goswami Mon Jul 30 2018 

The lammps.el file provided in this directory will enable syntax 

highlighting for the lammps script syntax in emacs. The groupings

============================

(0) Create/edit the emacs init file ~/.emacs to contain:

(load "~/.emacs.d/lammps")

(load "~/.emacs.d/lammps-mode.el")

This file may also be called ~/.emacs.el, or ~/.emacs.d/init.el

(1) Copy lammps.el to the directory ~/.emacs.d

(1) Copy lammps-mode.el to the directory ~/.emacs.d

=Update:

========

The package may now also be installed by a MELPA style recipe, namely:

```lisp

(lammps-mode :fetcher github :repo "HaoZeke/lammps-mode")

```

For a simpler installation with `use-package` simply add:

```lisp

(use-package lammps-mode)

```

The latest version of the package will be kept in sync as a squashed update on

the lammps repository as well.

It is advisable to use the MELPA installation methods listed here:

https://melpa.org/#/getting-started

For autoloading and auto-recognizing "in.*" and "*.lmp" files add the following

to `.emacs`:

```lisp

(autoload 'lammps-mode "lammps-mode.el" "LAMMPS mode." t)

(setq auto-mode-alist (append auto-mode-alist

                              '(("in\\." . lammps-mode))

                              '(("\\.lmp\\'" . lammps-mode))

                              ))

```

;; LAMMPS auto-mode

;;; lammps-mode.el --- basic syntax highlighting for LAMMPS files

;; Copyright (C) 2010-18 Aidan Thompson

;; Copyright (C) 2018 Rohit Goswami

;; Author: Aidan Thompson <athomps at sandia.gov>

;; Maintainer: Rohit Goswami <r95g10 at gmail.com>

;; Created: December 4, 2010

;; Modified: July 30, 2018

;; Version: 1.5.0

;; Keywords: languages, faces

;; Homepage: https://github.com/lammps/lammps/tree/master/tools/emacs

;; Package-Requires: ((emacs "24.4"))

;; This file is not part of GNU Emacs.

;; This file is free software; you can redistribute it and/or modify

;; it under the terms of the GNU General Public License as published by

;; the Free Software Foundation; either version 3, or (at your option)

;; any later version.

;; This file is distributed in the hope that it will be useful,

;; but WITHOUT ANY WARRANTY; without even the implied warranty of

;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License

;; along with GNU Emacs; see the file COPYING.  If not, write to

;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; translation of keyword classes from tools/vim

;; see http://xahlee.org/emacs/elisp_syntax_coloring.html

;; Put this in your .emacs file to enable autoloading of lammps-mode

;; and auto-recognition of "in.*" and "*.lmp" files:

;;

;; (autoload 'lammps-mode "lammps-mode.el" "LAMMPS mode." t)

;; (setq auto-mode-alist (append auto-mode-alist

;;                               '(("in\\." . lammps-mode))

;;                               '(("\\.lmp\\'" . lammps-mode))

;;                               ))

;;

;;; Code:

 ;; define several keyword classes

(defvar lammps-output

  '("log"

(defvar lammps-variable-regexp

  "\\$\\({[a-zA-Z0-9_]+}\\)\\|\\$[A-Za-z]")

(defvar lammps-font-lock-keywords)

;; clear memory

(setq lammps-output nil)

(setq lammps-read nil)

;; create the list for font-lock.

;; each class of keyword is given a particular face

(setq 

 lammps-font-lock-keywords

(setq lammps-font-lock-keywords

 `((,lammps-output-regexp . font-lock-function-name-face)

   (,lammps-read-regexp . font-lock-preprocessor-face)

   (,lammps-lattice-regexp . font-lock-type-face)

  (setq lammps-variable-regexp nil))

;; apply it to specified filename patterns

(setq 

 auto-mode-alist

 (append 

  auto-mode-alist

(setq auto-mode-alist

 (append auto-mode-alist

  '(("in\\." . lammps-mode))

  '(("\\.lmp\\'" . lammps-mode))

  ))

(provide 'lammps-mode)

;;; lammps-mode.el ends here