Hsieh Chin Fan typebrook

SPARQL Queries (with cURL command) on Wikidata

This gist resulted to be just the spark for a proper article, and won't be maintained here anymore.

The SPARQL endpoint is http://wdqs-beta.wmflabs.org/bigdata/namespace/wdq/sparql and it has a Web form to fire queries. However http://www.wikidata.org/prop/direct/P31 ("instance of") tells you what the entity is.

The repository doesn't have named graphs, or at least the SPARQL endpoint rejects graph queries. The classes of entities (rdf:type) are not described in the repository.

To find the HTML page of an entity (such as https://www.wikidata.org/entity/Q866405), simply replace /entity/ with /wiki/.

A mashup of Map Projection Distortions and transitions using the D3.js extended geographic projections plugin.

A comparison of map projections by four different types of distortion:

Acc. 40° 150% – The Acceptance index is a numerical measure that summarizes overall projection distortion, in this case with a maximum angular distortion of 40° and areal distortion of up to 150%.
Scale – The weighted mean error for overall scale distortion.
Areal – The weighted mean error for areal distortion.
Angular – The mean angular deformation index.

Lower is better. Data transcribed from the Natural Earth Projection by @mbostock.


Summary	How to control (or Understand) your GIST page's files list order.
Notice	not official documentation.

注意：本文内容适用于 Tmux 2.3 及以上的版本，但是绝大部分的特性低版本也都适用，鼠标支持、VI 模式、插件管理在低版本可能会与本文不兼容。

Tmux 快捷键 & 速查表 & 简明教程

启动新会话：

tmux [new -s 会话名 -n 窗口名]

恢复会话：

Nginx Cheat Sheet

(from Understanding Nginx Server and Location Block Selection Algorithms - https://goo.gl/YyzshP)

server {

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

	If you have a huge repository (in size and in history) and want to add a subfolder
	to your project as a submodule you can follow this example to save time and space
	using git's shallow clone and shallow checkout feature. It is a bit more complicated
	in this example because I assume that you want your submodule to track a non-default
	branch, called `mybranch`, instead of the `master` branch. Things could probably get
	a lot simpler when using the default branch. After following the commands in these
	examples you can use `git submodule update` and `git submodule update --remote` as normal.

	#!/usr/bin/env bash
	# MIT © Sindre Sorhus - sindresorhus.com

	# git hook to run a command after `git pull` or `git checkout` if a specified file was changed
	# Run `chmod +x post-checkout` to make it executable then put it into `.git/hooks/`.

	changed_files="$(git diff-tree -r --name-only --no-commit-id HEAD@{1} HEAD)"

	check_run() {
	echo "$changed_files" \| grep --quiet "$1" && echo " * changes detected in $1" && echo " * running $2" && eval "$2"

	#!/usr/bin/env python3
	# encoding: utf-8
	"""Use instead of `python3 -m http.server` when you need CORS"""

	from http.server import HTTPServer, SimpleHTTPRequestHandler


	class CORSRequestHandler(SimpleHTTPRequestHandler):
	def end_headers(self):
	self.send_header('Access-Control-Allow-Origin', '*')

	public class RealPathUtil {

	public static String getRealPath(Context context, Uri fileUri) {
	String realPath;
	// SDK < API11
	if (Build.VERSION.SDK_INT < 11) {
	realPath = RealPathUtil.getRealPathFromURI_BelowAPI11(context, fileUri);
	}
	// SDK >= 11 && SDK < 19
	else if (Build.VERSION.SDK_INT < 19) {