ajmcmiddlin

(ns clj-workshop.exercises)

(defn multiple-of
  [n]
  #(= 0 (mod % n)))

(defn ex1
  []
  (let [multiple-of-3? (multiple-of 3)
        multiple-of-5? (multiple-of 5)]

ajmcmiddlin

#!/usr/bin/env bash

db="$1"
out_dir="$2"
tables="$(mdb-tables -1 "$db")"

echo "$tables" | while read t; do
	mdb-export "$db" "$t" > "${out_dir}/${t}.csv"
done

ajmcmiddlin

#include <string>
#include <mapnik/map.hpp>
#include <mapnik/datasource_cache.hpp>
#include "vector_tile_processor.hpp"

#include "mvt_from_geojson.h"

struct _mvtc_return {
  mvtc_return_code return_code;
  std::string message;

ajmcmiddlin

General

• Space *: Search for word under cursor
• Space t F toggles auto-fill-mode, which enables hard wrapping
• C-x f calls set-fill-column - sets the column to wrap at
• g q to format (applies wrapping if auto-fill-mode enabled)
• Space s c clears search term
• * e edit word under cursor and change all in file/display (depending on mode)
• Space f y echo and yank filename for current buffer

ajmcmiddlin

Here be my notes while learining about GIS and web mapping for hastile

Links

• Tool that overlays tile info on Google maps
• Article explaining some terms

ajmcmiddlin

#!/usr/bin/env stack
-- stack --install-ghc runghc --package hasql

{-# LANGUAGE OverloadedStrings #-}

import           Data.Monoid            ((<>))
import           Hasql.Connection       (acquire, release, settings)
import           Hasql.Decoders         (int8, singleRow, value)
import           Hasql.Encoders         (unit)
import           Hasql.Query            (statement)

ajmcmiddlin

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix

ajmcmiddlin

Fixing Ubuntu OVAs made with Vagrant

Context

We have a Vagrantfile in fp-course for creating an Ubuntu environment with course prerequisites available. If you export an appliance (OVA) from the resultant VM, it will have issues when you import it on other machines.

Symptoms

ajmcmiddlin

The Dell U2711 on screen display (OSD) can be locked - I think by holding the button immediately above the power button (referred to as button 5 in some places). In my case I locked it totally by accident, and without realising what I'd done.

Unlocking the OSD proved quite the production. I found a [forum post] that contained most of the answer. I'll repeat the useful bit below:

• Switch the monitor off
• Disconnect all monitor cabling from the PC (VGA, DVI, HDMI, DP, USB, etc.)
• Disconnect the monitor power cord from the rear of the monitor
• Press and hold the monitor power button in for 5 seconds

ajmcmiddlin

#!/usr/bin/env ruby

BOARD_SIZE = 3
CELLS = BOARD_SIZE ** 2
MAGIC_SUM = 15
MAGIC_SQUARE = [8,1,6,3,5,7,4,9,2]
SYMBOLS = [:naught, :cross]

Game = Struct.new(:board, :next_symbol, :winner)