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---
title: "Development environments with Nix"
permalink: /development-environments-with-nix.html
date: 2023-06-25T16:38:10+02:00
layout: post
type: note
draft: false
tags: [random]
---
Nix is amazing for making reproducible cross OS development environment.
First you need to [install Nix package
manager](https://nixos.org/download.html).
- Create a file `shell.nix` in your project folder.
- In the section that has `python3` etc add programs you want to use. These can
be CLI or GUI applications. It doesn't matter to Nix.
```nix
{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
nativeBuildInputs = with pkgs.buildPackages; [
python3
tinycc
];
}
```
And then run it `nix-shell`. By default it will look for `shell.nix` file. If
you want to specify a different file use `nix-shell file.nix`. That is about it.
When the shell is spawned it could happen that your `PS1` prompt will be
overwritten and your prompt will look differently. In that case you need to
either do `NIX_SHELL_PRESERVE_PROMPT=1 nix shell` or add
`NIX_SHELL_PRESERVE_PROMPT` variable to your `bashrc` or `zshrc` file and set it
to `1`.
I also have a modified `PS1` prompt for Bash that I use and it also catches the
usage of Nix shell.
```sh
NIX_SHELL_PRESERVE_PROMPT=1
parse_git_branch() {
git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}
is_inside_nix_shell() {
nix_shell_name="$(basename "$IN_NIX_SHELL" 2>/dev/null)"
if [[ -n "$nix_shell_name" ]]; then
echo " \e[0;36m(nix-shell)\e[0m"
fi
}
export PS1="[\033[38;5;9m\]\u@\h\[$(tput sgr0)\]]$(is_inside_nix_shell)\[\033[33m\]\$(parse_git_branch)\[\033[00m\] \w\[$(tput sgr0)\] \n$ "
```
And this is what it looks like when you are in a Nix shell. Otherwise that part
of prompt is omitted
{:loading="lazy"}
More resources:
- https://nixos.wiki/wiki/Development_environment_with_nix-shell
- https://nixos.wiki/wiki/Main_Page
- https://itsfoss.com/why-use-nixos/
- https://mynixos.com/
|
