nix: remove nix tooling in favour of future flake.nix

Removing the Nix tooling managed by niv in favour of a future
`flake.nix`.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

default.nix

@@ -1,31 +0,0 @@
-{ sources ? import ./nix/sources.nix
-, pkgs ? import sources.nixpkgs {
-    overlays = [ (import sources.rust-overlay) ];
-  }
-, rust-overlay ? pkgs.rust-bin.stable.latest.default
-}:
-let
-  # TODO: remove once cargo-nextest is available in nixpkgs stable
-  cargo-nextest = (pkgs.callPackage ./nix/cargo-nextest/default.nix { });
-in
-  with pkgs;
-  mkShell {
-    name = "build";
-    buildInputs = [
-        # cargo tooling
-        cargo-deny
-        cargo-nextest
-        cargo-watch
-        pkgs.rust-bin.nightly."2022-07-01".rustfmt
-
-        # hard dependencies
-        cmake
-        openssl
-        pkgconfig
-        rust-overlay
-
-        # testing utilities
-        gettext # for `envsubst`
-        socat
-    ];
-  }

nix/cargo-nextest/default.nix

@@ -1,30 +0,0 @@
-{ sources ? import ../sources.nix
-, pkgs ? import sources.nixpkgs
-}:
-with pkgs;
-rustPlatform.buildRustPackage rec {
-  pname = "cargo-nextest";
-  version = "0.9.9";
-
-  src = fetchFromGitHub {
-    owner = "nextest-rs";
-    repo = "nextest";
-    rev = "cargo-nextest-${version}";
-    sha256 = "sha256-1s1N126S51kg7aOgAb8oMts1zJcO6QRn1fwbQf6ZaJ8=";
-  };
-
-  cargoSha256 = "sha256-JxZyl5Hti3Hh33e7H/pXhM6WkU0kDDml0naBPYzvNy4=";
-
-  nativeBuildInputs = [
-    pkg-config
-  ];
-
-  buildInputs = [
-    openssl
-    libiconv
-  ] ++ lib.optionals stdenv.isDarwin [
-    Security
-  ];
-
-  doCheck = false;
-}

nix/ci/fmt

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-set -eoux pipefail
-
-cargo fmt -- --check

nix/ci/run

@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-set -eou pipefail
-
-./nix/ci/fmt
-./scripts/ci/lint
-./scripts/ci/build
-./scripts/ci/test
-./scripts/ci/docs
-./scripts/ci/advisory

nix/sources.json

@@ -1,38 +0,0 @@
-{
-    "niv": {
-        "branch": "master",
-        "description": "Easy dependency management for Nix projects",
-        "homepage": "https://github.com/nmattia/niv",
-        "owner": "nmattia",
-        "repo": "niv",
-        "rev": "d67c25f29716fd2087e71352783fcce194303a9a",
-        "sha256": "1813r42sz4pmv1syn38s281lmg2l7h779q4r33nn5azm7wy45yrh",
-        "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/d67c25f29716fd2087e71352783fcce194303a9a.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "nixpkgs": {
-        "branch": "release-21.11",
-        "description": "Nix Packages collection",
-        "homepage": "",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "2766f77c32e171a04d59b636a91083bae862274e",
-        "sha256": "1xk1f62n00z7q5i3pf4c8c4rlv5k4jwpgh0pqgzw1l40vhdkixk9",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/2766f77c32e171a04d59b636a91083bae862274e.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "rust-overlay": {
-        "branch": "master",
-        "description": "Pure and reproducible nix overlay of binary distributed rust toolchains",
-        "homepage": "",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "e86c0fb5d3a22a5f30d7f64ecad88643fe26449d",
-        "sha256": "138pmz1ypw5j34bywfaffxkffsgfmd0s6889bdc69356cp11zvlm",
-        "type": "tarball",
-        "url": "https://github.com/oxalica/rust-overlay/archive/e86c0fb5d3a22a5f30d7f64ecad88643fe26449d.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    }
-}

nix/sources.nix

@@ -1,198 +0,0 @@
-# This file has been generated by Niv.
-
-let
-
-  #
-  # The fetchers. fetch_<type> fetches specs of type <type>.
-  #
-
-  fetch_file = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
-    if spec.builtin or true then
-      builtins_fetchurl { inherit (spec) url sha256; name = name'; }
-    else
-      pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
-
-  fetch_tarball = pkgs: name: spec:
-    let
-      name' = sanitizeName 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 = name: spec:
-    let
-      ref =
-        spec.ref or (
-          if spec ? branch then "refs/heads/${spec.branch}" else
-          if spec ? tag then "refs/tags/${spec.tag}" else
-          abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!"
-        );
-      submodules = spec.submodules or false;
-      submoduleArg =
-        let
-          nixSupportsSubmodules = builtins.compareVersions builtins.nixVersion "2.4" >= 0;
-          emptyArgWithWarning =
-            if submodules
-            then
-              builtins.trace
-                (
-                  "The niv input \"${name}\" uses submodules "
-                  + "but your nix's (${builtins.nixVersion}) builtins.fetchGit "
-                  + "does not support them"
-                )
-                { }
-            else { };
-        in
-        if nixSupportsSubmodules
-        then { inherit submodules; }
-        else emptyArgWithWarning;
-    in
-    builtins.fetchGit
-      ({ url = spec.repo; inherit (spec) rev; inherit ref; } // submoduleArg);
-
-  fetch_local = spec: spec.path;
-
-  fetch_builtin-tarball = name: throw
-    ''[${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
-  #
-
-  # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
-  sanitizeName = name:
-    (
-      concatMapStrings (s: if builtins.isList s then "-" else s)
-        (
-          builtins.split "[^[:alnum:]+._?=-]+"
-            ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
-        )
-    );
-
-  # The set of packages used when specs are fetched using non-builtins.
-  mkPkgs = sources: system:
-    let
-      sourcesNixpkgs =
-        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
-      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 name spec
-    else if spec.type == "tarball" then fetch_tarball pkgs name spec
-    else if spec.type == "git" then fetch_git name 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 ${builtins.toJSON spec.type}";
-
-  # If the environment variable NIV_OVERRIDE_${name} is set, then use
-  # the path directly as opposed to the fetched source.
-  replace = name: drv:
-    let
-      saneName = stringAsChars (c: if (builtins.match "[a-zA-Z0-9]" c) == null then "_" else c) name;
-      ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
-    in
-    if ersatz == "" then drv else
-      # this turns the string into an actual Nix path (for both absolute and
-      # relative paths)
-    if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
-
-  # 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));
-  concatMapStrings = f: list: concatStrings (map f list);
-  concatStrings = builtins.concatStringsSep "";
-
-  # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
-  optionalAttrs = cond: as: if cond then as else { };
-
-  # fetchTarball version that is compatible between all the versions of Nix
-  builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchTarball;
-    in
-    if lessThan nixVersion "1.12" then
-      fetchTarball ({ inherit url; } // (optionalAttrs (name != null) { inherit name; }))
-    else
-      fetchTarball attrs;
-
-  # fetchurl version that is compatible between all the versions of Nix
-  builtins_fetchurl = { url, name ? null, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchurl;
-    in
-    if lessThan nixVersion "1.12" then
-      fetchurl ({ inherit url; } // (optionalAttrs (name != null) { inherit name; }))
-    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 = replace name (fetch config.pkgs name spec); }
-      )
-      config.sources;
-
-  # The "config" used by the fetchers
-  mkConfig =
-    { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
-    , sources ? if sourcesFile == null then { } else builtins.fromJSON (builtins.readFile sourcesFile)
-    , system ? builtins.currentSystem
-    , pkgs ? mkPkgs sources system
-    }: 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); }

shell.nix

@@ -1,23 +0,0 @@
-{ sources ? import ./nix/sources.nix
-, pkgs ? import sources.nixpkgs {
-    overlays = [ (import sources.rust-overlay) ];
-  }
-}:
-let
-  stable = pkgs.rust-bin.stable.latest.default;
-  rust-overlay = stable.override {
-    extensions = [ "rust-src" "rust-analysis" ];
-  };
-  devault = (pkgs.callPackage ./default.nix {});
-in
-  with pkgs;
-  mkShell {
-    name = "development";
-    buildInputs = devault.buildInputs ++ [
-        clang
-        lld
-
-        ripgrep
-        rust-analyzer
-    ];
-  }