purcell

Automatic python version plus venv

Goal

For easy editor integration and command-line usage, we'd like to be able to specify a Python version per project, with its own virtualenv to isolate its libraries from those of other projects.

We're willing to change $PATH globally once, but not per project. And we'd like to avoid having to run every python command invocation in a special subshell created by a shell wrapper. Instead, simply invoking "python" or "pip" etc. should do the right thing, based on the directory in which it is invoked.

It turns out this is possible!

purcell

-- Let's say you have a table full of work:

CREATE TABLE tasks (
       id UUID PRIMARY KEY NOT NULL DEFAULT gen_random_uuid(),
       status TEXT NOT NULL DEFAULT 'pending',
       payload JSON NOT NULL, -- or just have meaningful columns!
       created_at TIMESTAMP NOT NULL DEFAULT NOW()
);

purcell

(defun key-quiz--shuffle-list (list)
  "Shuffles LIST randomly, modying it in-place."
  (dolist (i (reverse (number-sequence 1 (1- (length list)))))
    (let ((j (random (1+ i)))
	  (tmp (elt list i)))
      (setf (elt list i) (elt list j))
      (setf (elt list j) tmp)))
  list)

purcell

{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE FlexibleContexts #-}
{-# OPTIONS_GHC -fno-warn-missing-fields #-}

-- | Interpolate any type that inhabits both IsString and Semigroup
-- This code is based on the "here" package. It would be nice to strip
-- leading whitespace, as the "neat-interpolation" package does.
-- Additionally, "neat-interpolation" has a simpler interpolation

purcell

-- This is based on ideas from the excellent article "Beautiful Aggregations
-- with Haskell" by Evan Borden: https://tech.freckle.com/2017/09/22/aggregations/
module Aggregation where

import Prelude

import Data.Foldable (foldMap)
import Data.Monoid.Additive (Additive(..))
import Data.Newtype (un)

purcell

#!/bin/bash -e

image=mdillon/postgis:9.6-alpine
container_name=my-app-postgresql

if [ -z "$1" ]; then
    echo "Run command with a dockerised PostgreSQL DB.

usage: $(basename "$0") command

purcell

This code now lives in its own repo at https://github.com/purcell/postgresql-migrations

purcell

@-moz-document domain("github.com"), domain("gist.github.com") {
tt, code, pre, .file-data pre, textarea, .blob-line-code, .blob-code, .blob-code-inner, .diff-line-code {
        font-family: "Iosevka Fixed SS08", "Iosevka Fixed", "Iosevka Term", "Iosevka", "Input Mono Condensed", "PragmataPro", "Ubuntu Mono", "Menlo";
        font-weight: 400;
    }
}

@-moz-document domain("gitlab.com") {
tt, code, pre, textarea, .code, .file-content.code pre code {
        font-family: "Iosevka Fixed SS08", "Iosevka Fixed", "Iosevka Term", "Iosevka", "Input Mono Condensed", "PragmataPro", "Ubuntu Mono", "Menlo";

purcell

#!/bin/sh -e
# https://github.com/be5invis/Iosevka#build-your-own-style

DIR=~/Projects/External/iosevka

if [ -d "$DIR" ]; then
    (cd $DIR && git pull)
else
    git clone --depth 1 https://github.com/be5invis/Iosevka $DIR
fi

purcell

module Puzzle where

import Data.List (permutations)
import Control.Monad (guard)

solution = do
  [a,b,c,d,e,f] <- permutations "123456"
  guard $ multiple 6 [a,b,c,d,e,f]
  guard $ multiple 5 [a,b,c,d,e]
  guard $ multiple 4 [a,b,c,d]