Ken Coar RoUS

See my About.Me page at https://about.me/ken.coar Writing software since 1975; open software since 1996. A founder of The Apache Software Foundation.

RoUS / max-product.rb

Created December 14, 2011 18:29

Euler Challenge: maximum product from 5 consecutive digits in a 1000-digit integer

	#! /usr/bin/env ruby
	#
	# PROBLEM:
	# Find the greatest product of five consecutive digits in the 1000-digit number.
	#
	# 73167176531330624919225119674426574742355349194934
	# 96983520312774506326239578318016984801869478851843
	# 85861560789112949495459501737958331952853208805511
	# 12540698747158523863050715693290963295227443043557
	# 66896648950445244523161731856403098711121722383113

RoUS / toujours-debugger.rb

Created May 30, 2012 19:39

Keep your 'debugger' statements in even when testing on hosts lacking the gem

	#
	# This snippet allows you to sprinkle your code with #debugger references
	# even if the ruby-debug gem isn't installed (or there's some other error
	# encountered loading it).
	#
	begin
	require('ruby-debug')
	Debugger.start
	rescue Exception => e
	unless (Kernel.method_defined?(:debugger))

RoUS / Array.enrange.rb

Created September 6, 2012 14:16

[Ruby 1.8.7] Reduce consecutive elements in an array to ranges

	class Array

	#
	# Return an array with all occurrences of 2 or more logically
	# successive elements replaced with ranges, and disjoint elements
	# as-is.
	#
	# @param [Boolean] sorted
	# If this parameter can be evaluated as a Boolean 'true' value, the
	# current array will be copied and the copy sorted before

RoUS / configreader.sh

Created August 16, 2014 01:03

Bash function to read keys/values from an ini-style file section into an associative envariable

	# -- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; --
	# vim: ts=4:sw=4:noet
	#
	function _read_config_file() {
	local _cfgfile='/dev/stdin'
	local _section
	local _varname='CONFIG_HASH'
	local _line
	local _key
	local _value

RoUS / wrap.rb

Created January 15, 2015 18:14

OptionParser helper to wrap long option descriptions

	#
	# Long OptionParser descriptions don't get nicely wrapped by it, so
	# this method does the appropriate fill, wrap, and indent.
	#
	# @license Apache 2.0
	#
	# @overload wrap(*args)
	# @param [Array<Hash,String>] args
	# The argument list can include multiple strings and hashes.
	#

RoUS / keem.sh

Created April 15, 2015 21:19

Simple-minded Bash script for common GPG management tasks

	#! /bin/bash
	# -- coding: utf-8 --
	#--
	# Copyright © 2015 Ken Coar
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0

RoUS / dirchange.bash

Created January 7, 2016 17:25

Bash functions for doing things on cd into/out of directories

	#
	# This function provides for sourcing of shell scripts when moving
	# into (or out of) a directory.
	#
	# If the command exits with a non-zero status, or the working
	# directory isn't changed, no scripts are processed.
	#
	# If the command exits with a 0 status and the current working
	# directory does change, the previous directory is checked for an
	# ".on_exit" file. If found, it gets sourced. Similarly, the new WD

RoUS / block-arg-array-deconstruction.rb

Created February 3, 2019 22:06

Deconstructing arrays in block arguments

	h1 = {
	:one => 1,
	:two => 2,
	:three => 3,
	}
	# h1 => { :one => 1, :two => 2, :three => 3 }

	#
	# Each key/value pair is passed as a two-element array as the second
	# block argument -- so you can deconstruct it in the arglist declaration.

RoUS / gist:3c4ca47a971ed0bd4d2b86d501eb1dbf

Created June 11, 2019 21:09

Fedora 29, ruby-2.5.5 - gem command fails

	Fedora 29
	# rpm -q ruby rubygems
	ruby-2.5.5-101.fc29.x86_64
	rubygems-2.7.6.2-101.fc29.noarch
	# which gem
	/usr/bin/gem
	[root@Helium etc]# gem
	/usr/share/ruby/yaml.rb:5: warning: It seems your ruby installation is missing psych (for YAML output).
	To eliminate this warning, please install libyaml and reinstall your ruby.
	Traceback (most recent call last):