Lee Coltrane coltrane

coltrane / test-child-process-signals.js

Created May 5, 2012 04:51

Tests the response of node.js child processes to various posix signals.

	var child_process = require('child_process'),
	assert = require('assert')

	var isChild = !!(process.send),
	isMaster = ((!isChild) && (process.argv.length > 2)),
	isTopLevel = (!isMaster && !isChild)


	if( isTopLevel ) {

coltrane / backup.sh

Created May 7, 2012 17:05

example data dump with retry on failure

	#!/bin/bash

	while true ; do

	# there is no way to distinguish node's (1) exit code on SIGINT (and SIGTERM)
	# from a (1) exit code due to normal exit call in userland.
	# if node preserved SIGINT/SIGTERM, then the shell would detect node's
	# "abnormal exit" status, and the script would terminate immediately after
	# node returns

coltrane / dijkstra.js

Created October 29, 2012 05:59

An implementation of Dijkstra's path-finding algorithm in javascript.

	function node(name) {
	if (node.all[name]) { return node.all[name]; }
	if (!(this instanceof node)) { return new node(name); }
	node.all[name] = this;
	this.name = name;
	this.links = [];
	this.toString = function() { return name; }
	}
	node.all = {};

coltrane / trace.js

Created November 16, 2012 06:14

a function that examines the js call stack to find information about the caller


	/**
	* examines the call stack (if available) and returns a string
	* indicating the file and line number of the n'th previous ancestor call.
	* this works in chrome, and should work in nodejs as well.
	*
	* @param n : int (default: n=1) - the number of calls to trace up the
	* stack from the current call. `n=0` gives you your current file/line.
	* `n=1` gives the file/line that called you.
	*/

coltrane / oneliner.sh

Last active February 18, 2019 18:16

How can a bash (or sh) script reliably get a path to itself? (one-liner)

	#!/bin/sh

	# reliable path to current script in one-liner (handles spaces)
	scriptpath=$(l=$(which "$0"); while :; do cd "$(dirname "$l")"; p=$(basename "$l"); \
	l=$(readlink "$p") \|\| break; done; echo $(pwd)/$p)

	echo \'$scriptpath\'

coltrane / template-string.es6

Last active January 16, 2017 20:29

simple dynamic string templating for js that follows the syntax of es6 template literals

	const rxTemplateSubst = /\\?\${([^}]*)}/g;
	function template(str, substitutions) {
	if(!str) return str;
	return str.replace(rxTemplateSubst, (token, name) => {
	if(token[0] === '\\') return token.substr(1);
	return String(substitutions[name]);
	});
	}

	// simple replacements...

coltrane / withnode.sh

Last active June 20, 2019 15:58

Invokes <cmd> with proper path for vendored-node

	# usage:
	# withnode <cmd> [<args>...]
	#
	# Invokes <cmd> after adjusting PATH to include the appropriate local node/bin
	# directory. `node/bin` is first located by searching up the directory tree
	# starting with the current working directory.
	#
	function withnode() {
	path=$(pwd)
	while [[ $path != '/' ]]; do

coltrane / example.sh

Created February 14, 2019 16:50

better error handling in bash