Nodejs wrapper to support .noderc.js and dynamic prompt.

js

#!/bin/sh

# A Node.js wrapper
# Copyright 2015-2018 Rivoreo
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

NODE_PREFIX=/opt/node
NODE="$NODE_PREFIX/bin/node"

print_usage() {
	printf "Usage: %s [-{c|e} <command>] [-ipv] [<script-file>] [<argument>] [...]\\n" "$1"
}

command=
interactive=
print=

while getopts c:e:vpi c
do case $c in
	c|e)
		command="$OPTARG"
		;;
	v)
		exec "$NODE" -v
		;;
	i)
		interactive=-i
		;;
	p)
		print=-p
		;;
	*)
		print_usage "$0"
		exit 255
		;;
esac done
shift $((OPTIND-1))

load_rc_file='{
	var _fs = require("fs");
	var _vm = require("vm");
	_home = process.env["HOME"];
	if(_home) {
		rc_file = _home + "/.noderc.js";
		if(_fs.existsSync(rc_file)) _vm.runInThisContext(_fs.readFileSync(rc_file));
		rc_file = undefined;
		delete rc_file;
	}
	delete _home;
}'

[ -n "$command" ] && exec "$NODE" -e "$load_rc_file
$command" $interactive $print "$@"

run_file='{
	_fs.readFile(__filename === "-" ? "/dev/stdin" : __filename, function(e, data) {
		var _path = require("path");
		var _offset = 0;
		if(e) throw e;
		if(data.length > 3 && data[0] == 0x23 && data[1] == 0x21) {
			// Strip #!...
			_offset = 2;
			while(++_offset < data.length) if(data[_offset] == 0xa) break;
		}
		if(__filename === "-") {
			__filename = "[stdin]";
		} else {
			__filename = _path.resolve(__filename);
			__dirname = _path.dirname(__filename);
		}
		_vm.runInThisContext(data.toString("utf-8", _offset), { filename:__filename });
	});
}'

[ $# = 0 ] && [ -z "$interactive" ] && [ ! -t 0 ] && exec "$NODE" -e "$load_rc_file
__filename = \"-\";
$run_file" $print

[ "$1" = - ] && shift && set -- /dev/stdin "$@"

start_repl='{
	var _get_prompt;
	switch(typeof prompt) {
		case "string":
			break;
		case "function":
			_get_prompt = prompt;
			prompt = prompt();
			break;
		case "undefined":
			prompt = "nodejs> ";
			break;
	}
	var repl = require("repl").start(prompt, process, null, true, true);
	if(typeof _get_prompt === "function") {
		repl.getPrompt = _get_prompt;
		repl.displayPrompt = function(preserve_cur) {
			var prompt;
			if (repl.bufferedCommand.length) {
				prompt = "...";
				var levelInd = new Array(this.lines.level.length).join("..");
				prompt += levelInd + " ";
			} else prompt = repl.getPrompt();
			//repl.REPLServer.super_.prototype.setPrompt.call(repl, prompt);
			repl.setPrompt(prompt);
			repl.prompt(preserve_cur);
		};
	}
	//repl.commands.exit = 
	repl.on("close", function() {
		process.stderr.write("exit\n");
		repl.emit("exit");
		process.exit();
	});
}'

run_file_or_start_repl="if(process.argv.length > 1) {
	__filename = process.argv[1];
	$run_file
} else $start_repl"

exec "$NODE" -e "$load_rc_file
$run_file_or_start_repl" $interactive $print "$@"