Kris Leech krisleech

iTerm2 tab colours by directory

Colours each iTerm2 tab according to the project its $PWD is in, so tabs group visually by what you're working on. Every shell anywhere inside ~/dev/mile-os gets the same colour; a shell in ~/dev/mile-rails gets a different one.

Script: ~/.oh-my-zsh/custom/iterm-tab-color.zsh
Checksum: 9f11e053413d59f0f15146f2d2038a477194f44c1a541d4c277c0d6f8f98aef9
Set up: 2026-08-18

Conditional Put: Three Approaches Compared

1. Our Approach (Serializable Snapshot Isolation)

Repo.transaction(
  fn ->
    if has_events_since?(filters, max_position) do
      Repo.rollback(:inconsistent)
    else

Proposal to allow adapters to be switched at runtime in tests.

Example:

We have an EntityStore which has functions to save and find entities.

In our tests we want the ability to use different implimentations (real, dummy, in-memory etc.) in different tests.

We might want to use the real adapter in acceptance tests, a dummy one just to assert the adapter is called, and an in-memory adapter for all other tests (because it's faster).

$ gem build wisper.gemspec
Enter PEM pass phrase:
INFO:  Your certificate has expired, trying to re-sign it...
ERROR:  While executing gem ... (Gem::Security::Exception)
    certificate /CN=kris.leech\/DC=gmail\/DC=com not valid after 2020-10-15 18:13:45 UTC

$ gem cert --re-sign -C gem-public_cert.pem -K ~/.ssh/gem-private_key.pem

class MyEventHandler
  include BackgroundEventHandler
  
  def call(event)  
  end
end

class MyOtherEventHandler
  include ForegroundEventHandler

10:30 BG 4.5 mmol/litre
Run:
- 6k
- 5:11 mins/km pace
- Elevation gain: 76m
- Max elevation: 107m
11:10 BG 6.2 mmol.litre
Food (carbs)
11:50 BG 5.5 mmol/litre
12:30 BG 6.3 mmol/litre

	let(:model_class) do
	Class.new(ApplicationRecord) do
	self.table_name = "model_class_#{SecureRandom.uuid.delete('-')}"

	def self.up
	connection.execute("CREATE TABLE #{table_name}(id INTEGER PRIMARY KEY AUTOINCREMENT)")
	end

	def self.down
	ApplicationRecord.connection.execute("DROP TABLE #{table_name}")

	Add = ->(add, n) { n + add }
	Times = ->(times, n) { n * times }
	AddOne = Add.curry.call(1)
	TimesFour = Times.curry.call(4)

	AddOneTimesFour = AddOne >> TimesFour

	AddOneTimesFour.(2) # => 12

	require "bundler/inline"

	gemfile(false) do
	source "https://rubygems.org"
	gem "rspec"
	gem "pry-byebug"
	end

	require 'rspec/autorun'

	require "bundler/inline"

	gemfile(false) do
	source "https://rubygems.org"
	gem "dry-struct", '0.5'
	gem "dry-types", '0.14'
	gem 'rails_event_store-rspec', '1.0.0'
	gem "pry-byebug"
	gem 'activesupport'
	end