@@ -0,0 +1,19 @@+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[{justfile,go.mod,go.sum,*.go,.gitmodules}]
+indent_style = tab
+
+[*.yaml]
+indent_size = 4
+
+[*.md]
+indent_size = 4
+trim_trailing_whitespace = false

@@ -0,0 +1,11 @@+#!/usr/bin/env bash
+# the shebang is ignored, but nice for editors
+
+layout go
+
+if type -P lorri &>/dev/null; then
+  eval "$(lorri direnv)"
+else
+  echo 'while direnv evaluated .envrc, could not find the command "lorri" [https://github.com/nix-community/lorri]'
+  use nix
+fi

@@ -0,0 +1,29 @@+# Allowlisting gitignore template for GO projects prevents us
+# from adding various unwanted local files, such as generated
+# files, developer configurations or IDE-specific files etc.
+#
+# Recommended: Go.AllowList.gitignore
+
+# Ignore everything
+*
+
+# But not these files...
+!/.gitignore
+!/.editorconfig
+!/.envrc.sample
+
+!/README.md
+!/LICENSE
+!/justfile
+
+!/nix
+!*.nix
+
+!/.golangci.yaml
+!/go.sum
+!/go.mod
+!/gomod2nix.toml
+!*.go
+
+# ...even if they are in subdirectories
+!*/

@@ -0,0 +1,23 @@+---
+# yamllint disable-line rule:line-length
+# yaml-language-server: $schema=https://golangci-lint.run/jsonschema/golangci.jsonschema.json
+linters:
+    fast: false
+    enable:
+        - gocritic
+        - godox
+        - gosec
+        - grouper
+        - lll
+        - nilerr
+        - nilnil
+        - nlreturn
+        - noctx
+        - nosprintfhostport
+        - paralleltest
+        - prealloc
+        - reassign
+        - revive
+        - sloglint
+        - unconvert
+        - wrapcheck

@@ -0,0 +1,19 @@+Copyright (c) 2024 Alan Pearce <alan@alanpearce.eu>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

@@ -0,0 +1,35 @@+# Searchix
+
+## Development
+
+### Pre-requisites
+
+-   [Nix (the package manager)](https://nixos.org/download/)
+-   Optional:
+    -   [cachix](https://docs.cachix.org/installation#installation)
+    -   [lorri](https://github.com/nix-community/lorri)
+    -   [direnv](https://direnv.net/)
+    
+### Setup
+
+1. Optional: use cachix to avoid building some tools
+
+    ```shell-session
+    cachix use pre-commit-hooks
+    ```
+
+2. Start a nix shell (this will take some time)
+
+    ```shell-session
+    nix-shell
+    ```
+
+3. Optional: install and set up lorri and use `lorri shell` instead of `nix-shell`
+
+4. Optional: install direnv, integrate it with your shell and then run
+
+    ```shell-session
+    ln -s .envrc.sample .envrc
+    ```
+
+    Now `nix-shell` or `lorri shell` will be run for you automatically when you `cd` into this directory.

@@ -0,0 +1,68 @@+let
+  sources = import ./nix/sources.nix;
+in
+{ pkgs ? (
+    import sources.nixpkgs {
+      overlays = [
+        (import "${sources.gomod2nix}/overlay.nix")
+      ];
+    }
+  )
+}: {
+  searchix = pkgs.buildGoApplication {
+    pname = "searchix";
+    version = "0.1";
+    pwd = ./.;
+    src = ./.;
+    modules = ./gomod2nix.toml;
+  };
+
+  pre-commit-check = (import sources.git-hooks).run {
+    src = ./.;
+    hooks = {
+      gotest.enable = true;
+      golangci-lint.enable = true;
+      staticcheck.enable = true;
+
+      statix.enable = true;
+      deadnix = {
+        enable = true;
+        excludes = [ "./nix" ];
+      };
+      nixpkgs-fmt.enable = true;
+
+      convco.enable = true;
+
+      check-case-conflicts.enable = true;
+      check-symlinks.enable = true;
+      editorconfig-checker.enable = true;
+      prettier = {
+        enable = true;
+        types_or = [ "plain-text" "yaml" ];
+        settings = {
+          check = true;
+        };
+      };
+
+      yamllint = {
+        enable = true;
+      };
+      go-mod-tidy = {
+        enable = true;
+        name = "go-mod-tidy";
+        description = "Run `go mod tidy`";
+        types_or = [ "go" "go-mod" ];
+        entry = "${pkgs.go}/bin/go mod tidy";
+        pass_filenames = false;
+      };
+      gomod2nix = {
+        enable = true;
+        name = "gomod2nix";
+        description = "Import go.mod updates to nix";
+        types_or = [ "go-sum" ];
+        entry = "${pkgs.gomod2nix}/bin/gomod2nix";
+        pass_filenames = false;
+      };
+    };
+  };
+}

@@ -0,0 +1,3 @@+module searchix
+
+go 1.22.2

@@ -0,0 +1,3 @@+schema = 3
+
+[mod]

@@ -0,0 +1,16 @@+default:
+	@just --list --justfile {{ justfile() }} --unsorted
+
+checkformat:
+	gofmt -d .
+	goimports -d .
+
+format:
+	gofmt -w .
+	goimports -w .
+
+fix:
+	go fix .
+
+precommit:
+	nix-build -A pre-commit-check

@@ -0,0 +1,38 @@+{
+    "git-hooks": {
+        "branch": "master",
+        "description": "Seamless integration of https://pre-commit.com git hooks with Nix.",
+        "homepage": "",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "2849da033884f54822af194400f8dff435ada242",
+        "sha256": "0ag90l0hrkhm02mkmm8yf3fnjjawv99czc7bp0szzgknps0xrzxb",
+        "type": "tarball",
+        "url": "https://github.com/cachix/git-hooks.nix/archive/2849da033884f54822af194400f8dff435ada242.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "gomod2nix": {
+        "branch": "master",
+        "description": "Convert applications using Go modules to Nix expressions [maintainer=@adisbladis]",
+        "homepage": "",
+        "owner": "nix-community",
+        "repo": "gomod2nix",
+        "rev": "872b63ddd28f318489c929d25f1f0a3c6039c971",
+        "sha256": "1wh9rlhg2w42fsavh7wxvmw42l7m5wg290gnp571dq0qcr1z7kg1",
+        "type": "tarball",
+        "url": "https://github.com/nix-community/gomod2nix/archive/872b63ddd28f318489c929d25f1f0a3c6039c971.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs": {
+        "branch": "nixos-unstable",
+        "description": "Nix Packages collection",
+        "homepage": null,
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "58a1abdbae3217ca6b702f03d3b35125d88a2994",
+        "sha256": "05rpyikxpjf15nrzggrx4m0kjkjcmpyhm714nfrbhsp5cp1x1m4r",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/58a1abdbae3217ca6b702f03d3b35125d88a2994.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}

@@ -0,0 +1,198 @@+# 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); }

@@ -0,0 +1,5 @@+package main
+
+func main() {
+
+}

@@ -0,0 +1,33 @@+{ pkgs ? (
+    let
+      sources = import ./nix/sources.nix;
+    in
+    import sources.nixpkgs {
+      overlays = [
+        (import "${sources.gomod2nix}/overlay.nix")
+      ];
+    }
+  )
+}:
+
+let
+  goEnv = pkgs.mkGoEnv { pwd = ./.; };
+  searchix = import ./default.nix {
+    inherit pkgs;
+  };
+in
+pkgs.mkShell {
+  packages = with pkgs; [
+    goEnv
+
+    gomod2nix
+    niv
+    nixpkgs-lint
+
+    bun
+  ];
+  shellHook = ''
+    ${searchix.pre-commit-check.shellHook}
+  '';
+  buildInputs = searchix.pre-commit-check.enabledPackages;
+}