90 lines
3.2 KiB
EmacsLisp
90 lines
3.2 KiB
EmacsLisp
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;;; monroe-lua-complete.el --- Completion for Lua over Monroe connection
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;; Copyright © 2016 Phil Hagelberg
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;;
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;; Author: Phil Hagelberg
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;; URL: https://gitlab.com/technomancy/jeejah
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;; Version: 0.1.0
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;; Keywords: languages, nrepl, lua
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;; This file is not part of GNU Emacs.
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;;; Commentary:
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;; Provides live completion results for Lua by querying a Lua process
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;; over an nREPL connection. Uses `completion-at-point' but can be
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;; adapted for other completion methods.
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;;; Installation:
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;; Copy it to your load-path and (require 'monroe-lua-complete)
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;;; Usage:
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;; * Launch an nREPL server using jeejah.
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;; * Connect to it with M-x monroe.
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;; * Complete the expression at point with M-x completion-at-point
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;; also bound to M-tab or C-M-i.
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;;; Code:
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(require 'lua-mode) ; requires a newer lua-mode that has lua-start-of-expr
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(require 'monroe)
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(defvar monroe-completion-candidates nil)
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(defun monroe-completion-handler (response)
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"Set `monroe-completion-candidates' based on response from Lua server.
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Since monroe doesn't have any synchronous communication available, we
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have to `sit-for' and hope a response has been returned and handled."
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(monroe-dbind-response response (id completions status output)
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(let ((process (get-buffer-process monroe-repl-buffer)))
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(comint-output-filter process output)
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(when completions
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(setq monroe-completion-candidates completions))
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(when status
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(when (member "done" status)
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(remhash id monroe-requests))))))
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(defun monroe-lua-complete-function ()
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"Completion function for `completion-at-point-functions'.
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Queries over current lua connection for possible completions."
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(let ((expr (buffer-substring-no-properties (lua-start-of-expr) (point))))
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(monroe-send-request `("op" "complete"
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"input" ,expr
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;; TODO: at this time, monroe cannot bencode
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;; nested values, only string->string dicts
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;; "libs" ,(lua-local-libs)
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"session" ,(monroe-current-session))
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'monroe-completion-handler))
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(sit-for 0.1)
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(list (save-excursion (when (symbol-at-point) (backward-sexp)) (point))
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(point)
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monroe-completion-candidates))
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;;;###autoload
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(defun monroe-lua-hook ()
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(make-local-variable 'completion-at-point-functions)
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(add-to-list 'completion-at-point-functions 'monroe-lua-complete-function))
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;;;###autoload
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(eval-after-load 'lua-mode
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'(add-to-list 'lua-mode-hook 'monroe-lua-hook))
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;;; monroe-lua-complete.el ends here
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