arianvp

#!/bin/sh

#If already set (e.g. in github actions); use that instead
if [ -z "$GITHUB_TOKEN" ]; then
  nix run nixpkgs#gh auth status || nix run nixpkgs#gh auth login
  GITHUB_TOKEN="$(nix run nixpkgs#gh auth token)"
  export GITHUB_TOKEN
fi

NIX_CONFIG="access-tokens = github.com=$GITHUB_TOKEN"

izabera

A funky shell thingy that I've never seen before

So you're in posix sh and you want to do the equivalent of this in bash:

foo | tee >(bar) >(baz) >/dev/null

(Suppose that bar and baz don't produce output. Add redirections where needed if that's not the case.)

Sidneys1

#!/usr/bin/env bash
HELP="Usage: $0 [-n LINES] [-p PREFIX] [-w] [-h]

Continuously displays the last '-n' lines of 'stdin'.

Parameters:
  -n         Number of lines to display (default: 5).
  -p PREFIX  Prefix lines with 'PREFIX'.
  -w         Preserve blank lines (default: false).
  -h         Display this help

Linerre

• macOS, Zsh, and more
  • Zsh initializations
  • Zsh way of $PATH
  • the special macOS
  • /usr/libexec/path_helper
    • What is it?
    • What does it do?
    • What does it break?
  • Situation explained

• The .*shrc file

infinisil

Nixpkgs Pivots

We have a number of problems that currently require full rebuilds of nixpkgs:

• glibc needs to find third-party nss modules
• cacerts needs to contain custom CA's from enterprises
• tzdata just changed frequently
• locales

Interestingly, Nix's deep pinning of cacerts and tzdata gets in the way of Nix's promise of packages working over the long term in an archival sense:

rawiriblundell

# shellcheck shell=ksh
# If SH_LIBPATH is not set or null, then we try to build it
if [ -z "${SH_LIBPATH+x}" ] || [ "${#SH_LIBPATH}" -eq "0" ]; then
  for _path in /usr/local/lib/sh "${HOME}"/.local/lib/sh; do
    [ -d "${_path}" ] && SH_LIBPATH="${SH_LIBPATH}:${_path}"
  done
fi
unset -v _path
# Remove any leading colons from the construction process and export
SH_LIBPATH="${SH_LIBPATH#:}"

m-radzikowski

#!/usr/bin/env bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

llllllllll

Comments on optimizations around string concatenation.

Note: The code links are to CPython 3.8.5, the most recent release when this was written.

I was recently asked about a performance optimization in CPython around using += and + for string objects. As some people may already know, if you use += or + a string, it can sometimes be just as fast as ''.join. The question was to explain when that optimization couldn't be performed.

We will be going through the following example scenarios:

katef

#!/usr/bin/awk -f

# This program is a copy of guff, a plot device. https://github.com/silentbicycle/guff
# My copy here is written in awk instead of C, has no compelling benefit.
# Public domain. @thingskatedid

# Run as awk -v x=xyz ... or env variables for stuff?
# Assumptions: the data is evenly spaced along the x-axis

# TODO: moving average

burke

# typed: true
# frozen_string_literal: true
require('dev')
require('fileutils')

module Dev
  module Helpers
    class APFSVolume
      extend(T::Sig)