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xkr47 / jsonmap
Last active Oct 26, 2018
My perl-based `jq` replacement
View jsonmap
echo -n '{"a":5,"b":7}' | jsonmap -r '$_->{"a"}." and ".$_->{"b"}'
# usage: $0 [options] <perlcode> [<inputfile>]
# reads json from stdin/inputfile, or if -R given, reads whole input as a string
# perlcode gets the json/string as a perl object in $_
# return object from perlcode is encoded as json to stdout, or passed as-is if -r given
# pretty-printed by default, -c for compact
# all input/output is in UTF-8
xkr47 /
Last active Sep 11, 2018
Handy script for generating a github "diff" url between two refs


$ github-diff origin/master 04ed4b

Requires the commits to be available locally, so you might have to git fetch first.

xkr47 / ot-poi.txt
Last active Jun 9, 2019
Handy queries for Overpass Turbo -
View ot-poi.txt
// Handy search for POI objects - just swap `shop=kiosk` out for any `key=value` osm tag
xkr47 / gulpfile.js
Last active Aug 17, 2017
Simple gulp debug transform
View gulpfile.js
var gt = require('through-gulp');
.pipe(gt(function visitFile(file, enc, cb) {
console.log("file '" + file.path + "' contents: " + file.contents.toString());
cb(null, file);
}, function visitEnd(cb) {
console.log("No more files");
xkr47 /
Last active Aug 9, 2017
Logitech TrackMan Marble FX scroll wheel patch for the Linux kernel

Logitech TrackMan Marble FX scroll wheel patch for the Linux kernel

This patch alters the usbmouse kernel driver to support a "scroll wheel mode" using the fourth button (the red button) when connected through a "ID 04d9:1400 Holtek Semiconductor, Inc. PS/2 keyboard + mouse controller" usb-to-ps2 adapter. No idea how things work with other adapters.

It seems the fourth button generates events, but the state of the button is not represented in any bits (at least by said usb-to-ps2 adapter).

However since "no buttons pressed" is only ever reported when releasing a single button being pressed, detecting multiple "no buttons pressed" events can be used to identify usage of the fourth button.

xkr47 / acme-conf.json
Last active Mar 20, 2017
Brainstorming acme/letsencrypt configuration file
View acme-conf.json
"acme": {
"certstorePath": "/etc/certs/",
"accounts": [
"id": "nitor-srv01",
"provider": "acme://",
"acceptedAgreement": "",
"certificates": [
"id": "conflu",
xkr47 /
Last active Mar 12, 2017
An attempt to support TLS SNI in vertx with dynamic reconfiguration support
import io.vertx.core.Vertx;
public class DynamicCertOptions implements KeyCertOptions {
xkr47 /
Last active Jan 17, 2017
irssi keybindings for switching between up to 999 windows

irssi keybindings for switching between up to 999 windows

Use these keybindings to access up to 999 windows using at most 4 keys:

alt-0 .. alt-9 -> windows 0..9 (standard keybindings)
alt-q 0 .. alt-q 9 -> windows 10..19
alt-w 0 .. alt-w 9 -> windows 20..29
alt-p 0 .. alt-p 9 -> windows 90..99
alt-a 0 0 .. alt-a 0 9 -> windows 100..109

Keybase proof

I hereby claim:

  • I am xkr47 on github.
  • I am xkr47 ( on keybase.
  • I have a public key ASAdU_1qct6ysfYXrUMHiqUK2K56kgS3YnExyhUfI1cYHgo

To claim this, I am signing this object:

xkr47 /
Last active Aug 9, 2018
Using IntelliJ UI Designer for creating Swing forms in the Ceylon (1.3.0) language

I wanted to create a Swing app in Ceylon and figured I'd give using the UI designer a shot. Here are the necessary steps to get it to work:


Change IDEA settings

  • From the menu: File -> Settings
  • Navigate to Editor / GUI designer
  • Make sure "Generate GUI into:" has Java source code selected
  • Change "Default accessibility for UI-bound fields:" is something else than "private", for example package-private
  • Click OK to save
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