Lua mode

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.

FEATURES

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