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