A JavaScript development environment for Emacs https://indium.readthedocs.io
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;;; indium-nodejs.el --- NodeJS support for indium -*- lexical-binding: t; -*-
;; Copyright (C) 2016-2018 Nicolas Petton
;; Author: Nicolas Petton <nicolas@petton.fr>
;; Keywords: tools, javascript
;; 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/>.
;;; Commentary:
;; Handle indium connections to a NodeJS process using the v8 backend.
;;
;; Important note: For this package to work, NodeJS version 7.0 (or any newer
;; version) is required.
;;; Code:
(require 'url)
(require 'url-parse)
(require 'json)
(require 'map)
(require 'seq)
(require 'subr-x)
(declare-function indium-client-connect "indium-client.el")
(defun indium-launch-nodejs (conf)
"Start a NodeJS process.
Execute the command specified in CONF, adding the `--inspect'
flag. When the process is ready, open an Indium connection on
it.
If the configuration setting `inspect-brk' is non-nil, break the
execution at the first statement."
(let-alist conf
(unless .program
(user-error "No NodeJS program specified in the .indium.json file"))
(let* ((default-directory .resolvedRoot)
(filter (indium-nodejs--process-filter-function conf))
(command-with-flags (indium-nodejs--command-with-flags
.program
.args
.inspect-brk
.port))
(process (make-process :name "indium-nodejs-process"
:buffer "*node process*"
:filter filter
:command (list shell-file-name
shell-command-switch
command-with-flags))))
(message "Running node command \"%s\"" command-with-flags)
(switch-to-buffer (process-buffer process)))))
(defun indium-nodejs--command-with-flags (program args inspect-brk &optional port)
"Return a command string with flags to start the V8 inspector.
PROGRAM is the executable to run, with ARGS being the passed to the program.
If INSPECT-BRK is nil, use the `--inspect', use the
`--inspect-brk' flag otherwise.
If PORT is non-nil, start the debugging process on that port,
otherwise use Node's default port (9229)."
(let ((inspect-flag (if (eq inspect-brk t) " --inspect-brk" " --inspect"))
(inspect-port-flag (if port (format " --inspect-port=%s" port) "")))
(format "%s%s%s %s" program inspect-flag inspect-port-flag args)))
(defun indium-nodejs--process-filter-function (conf)
"Return a process filter function for CONF.
The function detects the socket URL to connect to from the
process output."
(let ((connected))
(lambda (process output)
;; Append output to the process buffer
(with-current-buffer (process-buffer process)
(goto-char (point-max))
(insert output))
(when (and (not connected)
(string-match-p "Debugger listening on" output))
;; Node will keep outputting the "Debugger listening on" message after
;; each deconnection, so only try to connect one.
(setq connected t)
(let-alist conf
(indium-client-connect (file-name-directory .projectFile) .name))))))
(provide 'indium-nodejs)
;;; indium-nodejs.el ends here