This document contains some ideas for additions to the Nix language.
The Nix package manager, Nixpkgs and NixOS currently have several problems:
enableFoo, but there is no way for the Nix
UI to discover them, let alone to provide programmatic ways to| #include <iostream> | |
| #include <complex> | |
| #include <cmath> | |
| #include <utility> | |
| #include <chrono> | |
| #include <array> | |
| // std::complex<T>::operators -- not constexpr in C++17 | |
| template <class T> |
| #include <type_traits> | |
| template <class From, class To> | |
| concept is_convertible = requires(From f){ | |
| { static_cast<To>(f) } -> To; | |
| }; | |
| template <typename Fst> | |
| concept BaseFst = requires { |
| #include <iostream> | |
| #include <cstring> | |
| #include <type_traits> | |
| #include <utility> | |
| #include <tuple> | |
| // graph descriptions | |
| template <int... Next> | |
| using AdjacentList = std::integer_sequence<int, Next...>; |
| import re | |
| import json | |
| from email.message import EmailMessage | |
| from email import message_from_string | |
| class InvalidMetadata(Exception): | |
| pass | |
| SINGLE_USE = [ | |
| "Metadata-Version", |
There a times when you need to build something from the nix unstable channel. For example the master contains a new package you need, but the next nixpkgs release is somewhere in the future, and you need this package now. In this guide I want to show how to install packages from unstable by using nix-env. Furthermore I hope to give a basic understanding of the channels concept.
A channel is a set of expressions which includes severall build, installation and configuration instructions for packages, services and the system itself. The repository normaly used here is nixpkgs. It is developed at https://github.com/NixOS/nixpkgs.
The unstable channel is a copy of the NixOS/nixpkgs master. It is pulled from github once in a while and will be available from a mirror under https://nixos.org/channels/nixpkgs-unstable. Since NixOS uses half-anual released stable channels, some changes (especially new f
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| #lang racket | |
| ;; numbers are represented as: | |
| ;; (lambda (f) (lambda (x) (f ... (f x)))) | |
| ;; where there are n calls to f. | |
| (define zero (lambda (f) (lambda (x) x))) | |
| (define one (lambda (f) (lambda (x) (f x)))) | |
| (define two (lambda (f) (lambda (x) (f (f x))))) | |
| ;; do add1 n times, starting from 0 |
