chore: move .nix -> nix, remove unused flake input

nix/repo/benchmark.nix

@@ -0,0 +1,18 @@
+{inputs, ...}: let
+  inherit (inputs) pkgs;
+in {
+  bench = pkgs.writeShellApplication {
+    name = "benchmark";
+    runtimeInputs = [pkgs.hyperfine];
+    text = ''
+      echo "Comparison cases first:"
+      hyperfine -w 3 \
+        'nix-instantiate ${inputs.self}/benchmark/shared.nix' \
+        'nix-instantiate ${inputs.self}/benchmark/empty.nix'
+      echo "Now real benchmark:"
+      hyperfine -w 3 \
+        'nix-instantiate ${inputs.self}/benchmark/nixpkgs-shell.nix' \
+        'nix-instantiate ${inputs.self}/benchmark/devshell.nix'
+    '';
+  };
+}

nix/repo/devShells.nix

@@ -0,0 +1,14 @@
+{inputs, ...}: let
+  inherit (inputs) pkgs devshell;
+in {
+  default = devshell.mkShell {
+    packages = [
+      pkgs.alejandra
+    ];
+    env."HELLO".value = "world!";
+    enterShellCommands.test = {
+      text = "echo Hello $HELLO";
+      deps = ["env"];
+    };
+  };
+}

nix/repo/docs.nix

@@ -0,0 +1,68 @@
+{inputs, ...}: let
+  inherit (inputs) pkgs devshell doclib;
+
+  roots = [
+    {
+      url = "https://gitlab.com/rensa-nix/devshell/-/blob/main/lib";
+      path = "${inputs.self}/lib";
+    }
+  ];
+  optionsDoc = doclib.mkOptionDocs {
+    module = devshell.modules;
+    inherit roots;
+  };
+  optionsDocs = pkgs.runCommand "options-docs" {} ''
+    mkdir -p $out
+    ln -s ${optionsDoc} $out/options.md
+  '';
+in
+  (doclib.mkDocs {
+    docs."default" = {
+      base = "${inputs.self}";
+      path = "${inputs.self}/docs";
+      material = {
+        enable = true;
+        colors = {
+          primary = "aqua";
+          accent = "blue";
+        };
+        umami = {
+          enable = false;
+          src = "https://analytics.tf/umami";
+          siteId = "";
+          domains = ["devshell.rensa.projects.tf"];
+        };
+      };
+      macros = {
+        enable = true;
+        includeDir = toString optionsDocs;
+      };
+      config = {
+        site_name = "Devshell";
+        repo_name = "rensa-nix/devshell";
+        repo_url = "https://gitlab.com/rensa-nix/devshell";
+        theme = {
+          logo = "images/logo.png";
+          icon.repo = "simple/gitlab";
+          favicon = "images/favicon.png";
+        };
+        nav = [
+          {"Introduction" = "index.md";}
+          {"Options" = "options.md";}
+        ];
+        markdown_extensions = [
+          {
+            "pymdownx.highlight".pygments_lang_class = true;
+          }
+          "pymdownx.inlinehilite"
+          "pymdownx.snippets"
+          "pymdownx.superfences"
+          "pymdownx.escapeall"
+          "fenced_code"
+        ];
+      };
+    };
+  }).packages
+  // {
+    inherit optionsDocs;
+  }

nix/repo/flake.lock

@@ -0,0 +1,62 @@
+{
+  "nodes": {
+    "mkdocs-material-umami": {
+      "locked": {
+        "lastModified": 1745840856,
+        "narHash": "sha256-1Ad1JTMQMP6YsoIKAA+SBCE15qWrYkGue9/lXOLnu9I=",
+        "owner": "technofab",
+        "repo": "mkdocs-material-umami",
+        "rev": "3ac9b194450f6b779c37b8d16fec640198e5cd0a",
+        "type": "gitlab"
+      },
+      "original": {
+        "owner": "technofab",
+        "repo": "mkdocs-material-umami",
+        "type": "gitlab"
+      }
+    },
+    "nixmkdocs": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1755783537,
+        "narHash": "sha256-78lWSC3UzkpWYsnyncqbrE37gEIWLzejOeDyoBb6h5o=",
+        "owner": "TECHNOFAB",
+        "repo": "nixmkdocs",
+        "rev": "4fd5a351c54e005c4e8df7e23a8e4eec9d3b8cd1",
+        "type": "gitlab"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "TECHNOFAB",
+        "repo": "nixmkdocs",
+        "type": "gitlab"
+      }
+    },
+    "nixtest-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1753957623,
+        "narHash": "sha256-kdImwKx57N0QL8HPUUb5ADwXFgSjaNOk39b/eKlzyTo=",
+        "owner": "TECHNOFAB",
+        "repo": "nixtest",
+        "rev": "22b43c9fe83be73c3f0648bbb54bc3c1cf7f96df",
+        "type": "gitlab"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "TECHNOFAB",
+        "repo": "nixtest",
+        "type": "gitlab"
+      }
+    },
+    "root": {
+      "inputs": {
+        "mkdocs-material-umami": "mkdocs-material-umami",
+        "nixmkdocs": "nixmkdocs",
+        "nixtest-lib": "nixtest-lib"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

nix/repo/flake.nix

@@ -0,0 +1,17 @@
+{
+  inputs = {
+    nixtest-lib.url = "gitlab:TECHNOFAB/nixtest?dir=lib";
+    nixmkdocs.url = "gitlab:TECHNOFAB/nixmkdocs?dir=lib";
+    mkdocs-material-umami.url = "gitlab:technofab/mkdocs-material-umami";
+  };
+  outputs = i:
+    i
+    // {
+      ntlib = i.nixtest-lib.lib {inherit (i.parent) pkgs;};
+      doclib = i.nixmkdocs.lib {
+        inherit (i.parent) pkgs;
+        inherit (i.parent.pkgs) lib;
+      };
+      devshell = import "${i.parent.self}/lib" {inherit (i.parent) pkgs;};
+    };
+}

nix/repo/tests.nix

@@ -0,0 +1,10 @@
+{inputs, ...}: let
+  inherit (inputs) pkgs ntlib devshell;
+in {
+  tests = ntlib.mkNixtest {
+    modules = ntlib.autodiscover {dir = "${inputs.self}/tests";};
+    args = {
+      inherit ntlib devshell pkgs;
+    };
+  };
+}