honeylisp/vendor/jeejah/monroe-lua-complete.el

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;;; monroe-lua-complete.el --- Completion for Lua over Monroe connection
;; Copyright © 2016 Phil Hagelberg
;;
;; Author: Phil Hagelberg
;; URL: https://gitlab.com/technomancy/jeejah
;; Version: 0.1.0
;; Keywords: languages, nrepl, lua
;; This program 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 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;; This file is not part of GNU Emacs.
;;; Commentary:
;; Provides live completion results for Lua by querying a Lua process
;; over an nREPL connection. Uses `completion-at-point' but can be
;; adapted for other completion methods.
;;; Installation:
;; Copy it to your load-path and (require 'monroe-lua-complete)
;;; Usage:
;; * Launch an nREPL server using jeejah.
;; * Connect to it with M-x monroe.
;; * Complete the expression at point with M-x completion-at-point
;; also bound to M-tab or C-M-i.
;;; Code:
(require 'lua-mode) ; requires a newer lua-mode that has lua-start-of-expr
(require 'monroe)
(defvar monroe-completion-candidates nil)
(defun monroe-completion-handler (response)
"Set `monroe-completion-candidates' based on response from Lua server.
Since monroe doesn't have any synchronous communication available, we
have to `sit-for' and hope a response has been returned and handled."
(monroe-dbind-response response (id completions status output)
(let ((process (get-buffer-process monroe-repl-buffer)))
(comint-output-filter process output)
(when completions
(setq monroe-completion-candidates completions))
(when status
(when (member "done" status)
(remhash id monroe-requests))))))
(defun monroe-lua-complete-function ()
"Completion function for `completion-at-point-functions'.
Queries over current lua connection for possible completions."
(let ((expr (buffer-substring-no-properties (lua-start-of-expr) (point))))
(monroe-send-request `("op" "complete"
"input" ,expr
;; TODO: at this time, monroe cannot bencode
;; nested values, only string->string dicts
;; "libs" ,(lua-local-libs)
"session" ,(monroe-current-session))
'monroe-completion-handler))
(sit-for 0.1)
(list (save-excursion (when (symbol-at-point) (backward-sexp)) (point))
(point)
monroe-completion-candidates))
;;;###autoload
(defun monroe-lua-hook ()
(make-local-variable 'completion-at-point-functions)
(add-to-list 'completion-at-point-functions 'monroe-lua-complete-function))
;;;###autoload
(eval-after-load 'lua-mode
'(add-to-list 'lua-mode-hook 'monroe-lua-hook))
;;; monroe-lua-complete.el ends here