arnehormann’s gists

arnehormann / must.go

Created September 23, 2013 10:58

usage example for reflect.MakeFunc: create panic-on-error wrappers which do not pass the error (in a comfortable but probably rather slow way)

	import "reflect"

	// assumption for fptr: func with error as last argument
	func makeMust(fptr interface{}) {
	must := func(in []reflect.Value) []reflect.Value {
	if err := in[len(in)-1]; !err.IsNil() {
	panic(err.Interface())
	}
	return in[:len(in)-1]
	}

arnehormann / set.go

Last active December 21, 2015 02:19

functional set variant in golang

	package set

	type Set interface {
	Empty() bool
	Size() int
	Equal(t Set) bool
	Subset(t Set) bool
	Superset(t Set) bool
	Union(t Set) Set
	Intersection(t Set) Set

arnehormann / shell-stuff.sh

Last active February 23, 2016 13:53

	#!/bin/bash

	# stop on errors and undeclared variables
	set -e -u -o pipefail

	err() {
	echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2
	}

arnehormann / shortcut-generator.hta

Created July 11, 2013 14:11

create a bunch of shortcuts to a program with the specified arguments (intended and great for putty with pageant)

	<html style="padding: 0; margin: 0; width: 690; height: 480;"><head>
	<hta:application id="oShortcutter" applicationname="Shortcutter" border="thin" caption="yes" contextmenu="no" scroll="no" showintaskbar="yes" singleinstance="yes" />
	<title>Shortcut Generator</title>
	<script language="VBScript">
	'<![CDATA[
	Option Explicit
	On Error Resume Next

	Sub SelectFolder
	' For next value see http://msdn.microsoft.com/en-us/library/bb773205(VS.85).aspx

arnehormann / ssl-email.sh

Last active April 20, 2016 11:52

create openssl certificates for ca, server and user (email); and sign them

	#!/bin/bash

	# crash on error exit codes and undefined variables
	set -e -u

	if [ "true" = "$TRACE" ]; then
	# trace execution (+x to get rid of noise)
	set -x
	fi

arnehormann / index.html

Created June 14, 2013 08:08

*reflect.StructField


	<!DOCTYPE html>
	<html><head><title>Go: '*reflect.StructField'</title><style>
	html { background-color: #fafafa; }
	div[data-kind] {
	box-sizing: border-box;
	position: relative;
	/* font */
	font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
	font-weight: 300;

arnehormann / dirtysql.go

Last active December 18, 2015 10:09

Hit the dangerous wobbly ground running: Quick&dirty up to speed with go database/sql

	type must struct {
	db *sql.DB
	stmt *sql.Stmt
	rows *sql.Rows
	err error
	closers []io.Closer
	}

	func Open(dbdriver, dsn string) *must {
	m := &must{}

arnehormann / truthtable.js

Created March 14, 2013 15:29

Create a truth table enumerating all possible parameter combinations for a function taking booleans. Arguments: target function, number of boolean arguments, string for true, string for false.

	function truthTable(fun, bits, t, f){
	var vars = bits \|\| 4
	, max = 1 << vars
	, tStr = t \|\| ' T '
	, fStr = f \|\| ' F '
	, i, j, str, arr, set, res;
	for (i = 0; i < max; i++) {
	str = '';
	arr = [];
	for (j = vars - 1; j >= 0; j--) {

arnehormann / liveedit.html

Created March 11, 2013 11:22

CSS live editing test

	<html><head><meta charset="utf-8"><title>CSS live editing test</title>
	<!-- credit: http://www.campaul.net/blog/2013/01/29/stupid-browser-tricks-live-editing-styles/ -->
	<style type="text/css" style="display: none;">
	/* show css for a very tight feedback loop */
	html { position: absolute; width: 100%; }
	head, body { display: block; position: absolute; }
	head { width: 40%; right: 0; background: #eee; }
	body { width: 60%; left: 0; }
	style { display: block; white-space: pre }
	</style><style type="text/css" contenteditable="plaintext-only">/* Edit CSS */

arnehormann / gauges.html

Last active December 14, 2015 11:49

A charting experiment

	<html><head><meta charset="utf-8"><title>Donuts</title>
	<!-- This is a modified version of the one found at http://www.larentis.eu/donuts/ -->
	<style type="text/css">
	.donut { font-size: 33px; }
	.donut-big { font-size: 62px; }
	.donut-small { font-size: 17px; }

	.donut {
	position: relative;
	display: inline-block;

Arne Hormann arnehormann