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bootstrap a cargo project with nix

main
Brian Hicks 1 year ago
commit
3bc807ac88
  1. 1
      .envrc
  2. 2
      .gitignore
  3. 9
      Cargo.toml
  4. 1
      dev.sh
  5. 26
      nix/sources.json
  6. 138
      nix/sources.nix
  7. 22
      shell.nix
  8. 3
      src/main.rs

1
.envrc

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use nix

2
.gitignore

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**/*.rs.bk
/target

9
Cargo.toml

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[package]
name = "wrap-comment"
version = "0.1.0"
authors = ["Brian Hicks <brian@brianthicks.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

1
dev.sh

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exec cargo watch -cx clippy

26
nix/sources.json

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{
"niv": {
"branch": "master",
"description": "Easy dependency management for Nix projects",
"homepage": "https://github.com/nmattia/niv",
"owner": "nmattia",
"repo": "niv",
"rev": "f73bf8d584148677b01859677a63191c31911eae",
"sha256": "0jlmrx633jvqrqlyhlzpvdrnim128gc81q5psz2lpp2af8p8q9qs",
"type": "tarball",
"url": "https://github.com/nmattia/niv/archive/f73bf8d584148677b01859677a63191c31911eae.tar.gz",
"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
},
"nixpkgs": {
"branch": "nixos-19.09",
"description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
"homepage": "https://github.com/NixOS/nixpkgs",
"owner": "NixOS",
"repo": "nixpkgs-channels",
"rev": "289466dd6a11c65a7de4a954d6ebf66c1ad07652",
"sha256": "0r5ja052s86fr54fm1zlhld3fwawz2w1d1gd6vbvpjrpjfyajibn",
"type": "tarball",
"url": "https://github.com/NixOS/nixpkgs-channels/archive/289466dd6a11c65a7de4a954d6ebf66c1ad07652.tar.gz",
"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
}
}

138
nix/sources.nix

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# This file has been generated by Niv.
let
#
# The fetchers. fetch_<type> fetches specs of type <type>.
#
fetch_file = pkgs: spec:
if spec.builtin or true then
builtins_fetchurl { inherit (spec) url sha256; }
else
pkgs.fetchurl { inherit (spec) url sha256; };
fetch_tarball = pkgs: name: spec:
let
ok = str: ! builtins.isNull (builtins.match "[a-zA-Z0-9+-._?=]" str);
# sanitize the name, though nix will still fail if name starts with period
name' = stringAsChars (x: if ! ok x then "-" else x) "${name}-src";
in
if spec.builtin or true then
builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
else
pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
fetch_git = spec:
builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
fetch_local = spec: spec.path;
fetch_builtin-tarball = name: throw
''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
$ niv modify ${name} -a type=tarball -a builtin=true'';
fetch_builtin-url = name: throw
''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
$ niv modify ${name} -a type=file -a builtin=true'';
#
# Various helpers
#
# The set of packages used when specs are fetched using non-builtins.
mkPkgs = sources:
let
sourcesNixpkgs =
import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
hasThisAsNixpkgsPath = <nixpkgs> == ./.;
in
if builtins.hasAttr "nixpkgs" sources
then sourcesNixpkgs
else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
import <nixpkgs> {}
else
abort
''
Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
add a package called "nixpkgs" to your sources.json.
'';
# The actual fetching function.
fetch = pkgs: name: spec:
if ! builtins.hasAttr "type" spec then
abort "ERROR: niv spec ${name} does not have a 'type' attribute"
else if spec.type == "file" then fetch_file pkgs spec
else if spec.type == "tarball" then fetch_tarball pkgs name spec
else if spec.type == "git" then fetch_git spec
else if spec.type == "local" then fetch_local spec
else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
else if spec.type == "builtin-url" then fetch_builtin-url name
else
abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
# Ports of functions for older nix versions
# a Nix version of mapAttrs if the built-in doesn't exist
mapAttrs = builtins.mapAttrs or (
f: set: with builtins;
listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
);
# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
concatStrings = builtins.concatStringsSep "";
# fetchTarball version that is compatible between all the versions of Nix
builtins_fetchTarball = { url, name, sha256 }@attrs:
let
inherit (builtins) lessThan nixVersion fetchTarball;
in
if lessThan nixVersion "1.12" then
fetchTarball { inherit name url; }
else
fetchTarball attrs;
# fetchurl version that is compatible between all the versions of Nix
builtins_fetchurl = { url, sha256 }@attrs:
let
inherit (builtins) lessThan nixVersion fetchurl;
in
if lessThan nixVersion "1.12" then
fetchurl { inherit url; }
else
fetchurl attrs;
# Create the final "sources" from the config
mkSources = config:
mapAttrs (
name: spec:
if builtins.hasAttr "outPath" spec
then abort
"The values in sources.json should not have an 'outPath' attribute"
else
spec // { outPath = fetch config.pkgs name spec; }
) config.sources;
# The "config" used by the fetchers
mkConfig =
{ sourcesFile ? ./sources.json
, sources ? builtins.fromJSON (builtins.readFile sourcesFile)
, pkgs ? mkPkgs sources
}: rec {
# The sources, i.e. the attribute set of spec name to spec
inherit sources;
# The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
inherit pkgs;
};
in
mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }

22
shell.nix

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{ ... }:
let
sources = import ./nix/sources.nix;
nixpkgs = import sources.nixpkgs { };
niv = import sources.niv { };
in with nixpkgs;
stdenv.mkDerivation {
name = "wrap-comment";
buildInputs = [
niv.niv
git
# rust
cargo
rustc
rustfmt
cargo-watch
rustPackages.clippy
];
}

3
src/main.rs

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fn main() {
println!("Hello, world!");
}
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