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robots.txt file controls what pages of your allplications gets crawled by the serach engine bots. As part of robots.txt file we can allow or disallow single pages or directories within the application.

robots.txt file lives in the root folder of your application. A simple, static solution in Rails would be, to put a robots.txt file into you /public folder in your rails app but then you can't dynamically set the content of this file.

If you want a different file for staging and production server or want some dynamic routes in your robots.txt, then you need to generate this file with rails. Make sure you remove/rename robots.txt from /public folder.

How to compress PDF using ghostscript

As a developer, it bothers me when someone sends me a large pdf file compared to the number of pages. Recently, I recieved a 12MB scanned document for just one letter-sized page... so I got to googlin, like I usually do, and found ghostscript!

to learn more abot ghostscript (gs): https://www.ghostscript.com/

What we are interested in, is the gs command line tool, which provides many options for manipulating PDF, but we are interested in compressign those large PDF's into small yet legible documents.

credit goes to this answer on askubuntu forum: https://askubuntu.com/questions/3382/reduce-filesize-of-a-scanned-pdf/3387#3387?newreg=bceddef8bc334e5b88bbfd17a6e7c4f9

How to automatically sync Obsidian between Github and Android with Termux and Tasker

I use Obsidian git on PC, and this workaround (since the plugin doesn't support mobile) to seamlessly* sync my notes to and from my phone. Using these instructions you create an automation for pulling every time you open Obsidian, and pushing every time you close it.

_{* you can still get merge conflicts...}

Preparation

Install Tasker.
Install Termux.
Install Termux tasker plugin.
Open Termux and write termux-setup-storage, give it permissions.

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	using Microsoft.AspNetCore.Builder;
	using Microsoft.AspNetCore.Hosting;
	using Microsoft.EntityFrameworkCore.Infrastructure;
	using Microsoft.Extensions.Configuration;
	using Microsoft.Extensions.DependencyInjection;
	using Microsoft.Extensions.Logging;
	using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
	using Microsoft.EntityFrameworkCore;

	namespace MyApp.Api

	#!/bin/bash
	#
	# Template-O-Matic
	# Converts between Gitpod and CodeAnywhere templates
	#
	# Niel McEwen & Matt Rudge, 2024

	cafolder=".devcontainer"
	gitpodfolder=".vscode"
	ide="Gitpod"

	// Code ported from https://0fps.net/2012/06/30/meshing-in-a-minecraft-game/

	// Note this implementation does not support different block types or block normals
	// The original author describes how to do this here: https://0fps.net/2012/07/07/meshing-minecraft-part-2/



	const int CHUNK_SIZE = 32;

	// These variables store the location of the chunk in the world, e.g. (0,0,0), (32,0,0), (64,0,0)

	{
	// Disable telemetry
	"telemetry.telemetryLevel": "off",
	// Zen mode
	"zenMode.fullScreen": false,
	"zenMode.hideTabs": true,
	"zenMode.centerLayout": false,
	// Theming
	"workbench.iconTheme": "city-lights-icons-vsc",
	"editor.fontFamily": "Dank Mono",