thomas t56k

iOS Cell Registration & Reusing with Swift Protocol Extensions and Generics

A common task when developing iOS apps is to register custom cell subclasses for both UITableView and UICollectionView. Well, that is if you don’t use Storyboards, of course.

Both UITableView and UICollectionView offer a similar API to register custom cell classes:

public func registerClass(cellClass: AnyClass?, forCellWithReuseIdentifier identifier: String)
public func registerNib(nib: UINib?, forCellWithReuseIdentifier identifier: String)

Changes with .dev domains in mind.

Create /etc/pf.anchors/dev, containing:

rdr pass inet proto tcp from any to any port 80 -> 127.0.0.1 port 8080
rdr pass inet proto tcp from any to any port 443 -> 127.0.0.1 port 8443

First, check your current config (example output in homebrew.mxcl.postgresql.plist.xml lower down in this gist):

cat ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

Most importantly, note the -D /usr/local/var/postgres argument.

Second, shut down your current PostgreSQL.

launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

Subdomaining Localhost with Rails 5

I've been following this blog post on how to set up an api-only Rails 5 application. One of the sections talks about creating a subdomain for your api

Rails.application.routes.draw do
  constraints subdomain: "api" do
    scope module: "api" do

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

	$ brew uninstall postgresql
	$ gem uninstall pg # ALL OF THEM
	$ rm -fr /usr/local/var/postgres
	$ launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
	$ pg_ctl -D /usr/local/var/postgres stop -s -m fast # WE SHOULD HAVE ALL postgres SERVERS & PROCESSES STOPPED BY NOW
	$ brew install postgres
	$ env ARCHFLAGS="-arch x86_64" gem install pg
	$ echo "DONE." >> /dev/null

	func main() {
	str := "abc foo:bar def baz:qux ghi"
	re := regexp.MustCompile("([a-z]+):([a-z]+)")
	result := ReplaceAllStringSubmatchFunc(re, str, func(groups []string) string {
	return groups[1] + "." + groups[2]
	})
	fmt.Printf("'%s'\n", result)
	}

	# Install ARCH Linux with encrypted file-system and UEFI
	# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

	# Download the archiso image from https://www.archlinux.org/
	# Copy to a usb-drive
	dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

	# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

	# Set swiss-french keymap


	Julia and Samantha are playing with strings. Julia has a string S, and Samantha has a string T which is a subsequence of string S. They are trying to find out what words are missing in T.
	Help Julia and Samantha to solve the problem. List all the missing words in T, such that inserting them at the appropriate positions in T, in the same order, results in the string S.
	Constraints
	1 <= \|T\| <= \|S\| <= 106, where \|X\| denotes the length of string X.
	The length of each word will be less than 15.

	Function Parameter
	You are given a function missingWords that takes the strings S and T as its arguments.