zed/nix/modules/devshells.nix
Diego Perez cfbf6ebe96
nix: Use flake-parts, partitions, and treefmt-nix (#45321)
Release Notes:

Refactored:
- Use [flake-parts](https://flake.parts/index.html) modules
- `nix/shell.nix` -> `nix/modules/devshells.nix`

Added:
- Use
[flake-parts.partitions](https://flake.parts/options/flake-parts-partitions.html)
to isolate dev dependencies so that flakes that use `zed-editor` don't
fetch dev-only inputs such as `treefmt-nix`
- [treefmt-nix](https://github.com/numtide/treefmt-nix)
  - nixfmt
  - rustfmt

Fixed:
- `shell.nix` and `default.nix` fetching `flake-compat` from
`flake.lock` which added an extra and unnecessary input/dependency to
`flake.nix`. Fixed by setting a fixed rev and sha256 instead.
- `nixfmt-rfc-style` is deprecated and is now `nixfmt`
- Fixes #45338 by using rust-overlay toolchain directly
  - Previously, the devShell included `rustup` which caused slow startup
times as Nix would build rustup from source (including running its test
suite). Additionally, rust tooling (cargo, rustfmt, clippy,
rust-analyzer) wasn't available in the dev shell.
- cargo, rustc, and rust-toolchain.toml components included in
`rustToolchain`

Chore:
- Update `flake.lock`
- Format Rust code with `rustfmt` via `treefmt-nix`

---------

Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>
2026-02-02 14:26:42 +00:00

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{ inputs, ... }:
{
perSystem =
{ pkgs, ... }:
let
# NOTE: Duplicated because this is in a separate flake-parts partition
# than ./packages.nix
mkZed = import ../toolchain.nix { inherit inputs; };
zed-editor = mkZed pkgs;
rustBin = inputs.rust-overlay.lib.mkRustBin { } pkgs;
rustToolchain = rustBin.fromRustupToolchainFile ../../rust-toolchain.toml;
baseEnv =
(zed-editor.overrideAttrs (attrs: {
passthru.env = attrs.env;
})).env; # exfil `env`; it's not in drvAttrs
in
{
devShells.default = (pkgs.mkShell.override { inherit (zed-editor) stdenv; }) {
name = "zed-editor-dev";
inputsFrom = [ zed-editor ];
packages = with pkgs; [
rustToolchain # cargo, rustc, and rust-toolchain.toml components included
cargo-nextest
cargo-hakari
cargo-machete
cargo-zigbuild
# TODO: package protobuf-language-server for editing zed.proto
# TODO: add other tools used in our scripts
# `build.nix` adds this to the `zed-editor` wrapper (see `postFixup`)
# we'll just put it on `$PATH`:
nodejs_22
zig
];
env =
(removeAttrs baseEnv [
"LK_CUSTOM_WEBRTC" # download the staticlib during the build as usual
"ZED_UPDATE_EXPLANATION" # allow auto-updates
"CARGO_PROFILE" # let you specify the profile
"TARGET_DIR"
])
// {
# note: different than `$FONTCONFIG_FILE` in `build.nix` this refers to relative paths
# outside the nix store instead of to `$src`
FONTCONFIG_FILE = pkgs.makeFontsConf {
fontDirectories = [
"./assets/fonts/lilex"
"./assets/fonts/ibm-plex-sans"
];
};
PROTOC = "${pkgs.protobuf}/bin/protoc";
ZED_ZSTD_MUSL_LIB = "${pkgs.pkgsCross.musl64.pkgsStatic.zstd.out}/lib";
};
};
};
}