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Showing content from https://github.com/immerrr/lua-mode/ below:

immerrr/lua-mode: Emacs major mode for editing Lua

lua-mode is a major mode for editing Lua sources in Emacs.

If you have a problem or a suggestion about lua-mode, please, let me know about it via github's Issue Tracker.

lua-mode's officially supported installation method is from MELPA archive.

To get started, enable installing packages from MELPA:

(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
(package-initialize)

To fetch the list of packages you can do

    <M-x> package-refresh-contents

And after that lua-mode can be installed with

    <M-x> package-install "lua-mode"

Please, refer to MELPA documentation and Emacs documentation on packages for further information.

El-get is a package manager which greatly simplifies adding modules to your Emacs and keeping them up-to-date. Once you have el-get set up, lua-mode can also be installed with

<M-x> el-get-install "lua-mode"

and updating is no more than

<M-x> el-get-update "lua-mode"

Please, consult with el-get documentation for further information.

To install, you need to make sure that lua-mode.el is on your load-path (and optionally byte-compile it) and to set up Emacs to automatically enable lua-mode for *.lua files or ones that contain lua hash-bang line (#!/usr/bin/lua). Putting this snippet to .emacs should be enough in most cases:

    ;;;; This snippet enables lua-mode

    ;; This line is not necessary, if lua-mode.el is already on your load-path
    (add-to-list 'load-path "/path/to/directory/where/lua-mode-el/resides")

    (autoload 'lua-mode "lua-mode" "Lua editing mode." t)
    (add-to-list 'auto-mode-alist '("\\.lua$" . lua-mode))
    (add-to-list 'interpreter-mode-alist '("lua" . lua-mode))

• syntactic indentation & highlighting (including multiline literals/comments)
• evaluation of lines/regions/functions/files in Lua subprocess or direct interaction with its REPL
• documentation lookup (using online/offline reference manual, e.g. string.find)
• imenu integration
• HideShow integration
• Flymake integration for on-the-fly linting. The luacheck program is required for this. It can be installed e.g. via luarocks.

The following variables are available for customization (see more via M-x customize-group lua):

• Var lua-indent-level (default 3): indentation offset in spaces
• Var lua-indent-string-contents (default nil): set to t if you like to have contents of multiline strings to be indented like comments
• Var lua-indent-nested-block-content-align (default t) set to nil to stop aligning the content of nested blocks with the open parenthesis
• Var lua-indent-close-paren-align (default t) set to t to align close parenthesis with the open parenthesis rather than with the beginning of the line
• Var lua-mode-hook: list of functions to execute when lua-mode is initialized
• Var lua-documentation-url (default "http://www.lua.org/manual/5.1/manual.html#pdf-"): base URL for documentation lookup
• Var lua-documentation-function (default browse-url): function used to show documentation (eww is a viable alternative for Emacs 25)

• Var lua-default-application (default "lua"): command to start up the subprocess (REPL)
• Var lua-default-command-switches (default "-i"): arguments to pass to the subprocess on startup (make sure -i is there if you expect working with Lua shell interactively)
• Cmd lua-start-process: start new REPL process, usually happens automatically
• Cmd lua-kill-process: kill current REPL process

• Cmd lua-show-process-buffer: switch to REPL buffer
• Cmd lua-hide-process-buffer: hide window showing REPL buffer
• Var lua-always-show: show REPL buffer after sending something
• Cmd lua-send-buffer: send whole buffer
• Cmd lua-send-current-line: send current line
• Cmd lua-send-defun: send current top-level function
• Cmd lua-send-region: send active region
• Cmd lua-restart-with-whole-file: restart REPL and send whole buffer

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