aslak01

So you want to modify the text of a PDF by hand...

If you, like me, resent every dollar spent on commercial PDF tools, you might want to know how to change the text content of a PDF without having to pay for Adobe Acrobat or another PDF tool. I didn't see an obvious open-source tool that lets you dig into PDF internals, but I did discover a few useful facts about how PDFs are structured that I think may prove useful to others (or myself) in the future. They are recorded here. They are surely not universally applicable --
the PDF standard is truly Byzantine -- but they worked for my case.

Acronym

C-a ==> CTRL-a

Modes in VIM

Normal mode(n) When we open mode, the default mode is normal
Insert mode(i) When we want to insert some text, we press i, a or A etc to go in insert mode
Command mode(c) When we type colon(:) from normal mode, we enters command mode
Visual mode(v) Using v or V or C-i

Start VIM

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

This gist shows how to create an animated world map of life expectancy using R. The data comes the UN World Population Prospects, 2015 Revision, and it brings life expectancy data from 1950 untill 2015 and projeceted data up to 2100. Thanks Topi Tjukanov, who reminded me of the UN DESA data portal, where you can find this dataset and many others

The idea is to use open data to create a GIF, much like the ones created by Aron Strandberg but his maps look much nicer. The output of this script is a map like this one:

[![enter image description here][1]][1]

Now diving into the code. First, let's load the necessary libraries and get the data. As of this writing, the current version of gganimate has a bug that messes the aesthetics of the .gif file. As a temporary solution, I've intalled an older version of the package, [as recommended by the author of the gganimate, David Ro

	<!DOCTYPE html>
	<html prefix="og: http://ogp.me/ns#">

	<head>
	<!-- content-type, which overrides http equivalent header. Because of charset, this meta should be set at first. -->
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
	<!-- Overrides http equivalent header. This tells IE to use the most updated engine. -->
	<meta http-equiv="X-UA-Compatible" content="IE=Edge">
	<!-- Tells crawlers how to crawl this page, and the role of this page. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta -->
	<meta name="robots" content="index, follow">

	// npm i --save jsonp
	import jsonp from 'jsonp';

	var host = 'http://192.168.1.140';

	var data = {
	'jsonrpc': '2.0',
	'method': 'Application.GetProperties',
	'params': '[["volume","muted","version"]]',
	'id': Math.ceil(Math.random() * 10000)

	1. $ brew install fontforge ttf2eot ttfautohint

	2. $ brew tap bramstein/webfonttools && brew install sfnt2woff

	3. Download/clone https://github.com/google/woff2 into any handy dir
	cd into dir and:
	$ git submodule init
	$ git submodule update
	$ make clean all
	then: