4 files changed, 173 insertions, 0 deletions
diff --git a/nix/package/dev-shell.nix b/nix/package/dev-shell.nix
new file mode 100644
index 0000000..4ace75c
--- /dev/null
+++ b/nix/package/dev-shell.nix
@@ -0,0 +1,32 @@
+#──────────────────────────────────────────────────────────────────────────────┐
+# SPDX-FileCopyrightText: 2025 toastal <https://toast.al/contact/>             │
+# SPDX-License-Identifier: LGPL-2.1-or-later                                   │
+#──────────────────────────────────────────────────────────────────────────────┘
+{
+   mkShell,
+   kdlfmt,
+   topiary,
+   ocamlPackages,
+   nixtamal,
+   nixfmt-3-space,
+   ocamlformat-rpc-bin,
+}:
+
+mkShell {
+   name = "nixtamal";
+   inputsFrom = [
+      nixtamal
+   ];
+   packages = [
+      kdlfmt
+      nixfmt-3-space
+      topiary
+
+      ocamlPackages.alcotest
+      ocamlPackages.ocaml-lsp
+      ocamlformat-rpc-bin # 💢 why does the LSP depend on ocamlformat‽
+   ];
+   env = {
+      TOPIARY_CONFIG_FILE = "${../../.topiary.ncl}";
+   };
+}
diff --git a/nix/package/nixfmt-3-space.nix b/nix/package/nixfmt-3-space.nix
new file mode 100644
index 0000000..fe2b003
--- /dev/null
+++ b/nix/package/nixfmt-3-space.nix
@@ -0,0 +1,30 @@
+#──────────────────────────────────────────────────────────────────────────────┐
+# SPDX-FileCopyrightText: 2025 toastal <https://toast.al/contact/>             │
+# SPDX-License-Identifier: LGPL-2.1-or-later                                   │
+#──────────────────────────────────────────────────────────────────────────────┘
+# I don’t like *this* formatter, but it is *a* formatter. Tweaking it to expand
+# to 3 spaces, helps the maker actually read the code since 2 spaces is not
+# enough contrast (& Nix magic strings don’t support tabs).
+{
+   lib,
+   writeTextFile,
+   dash,
+   nixfmt-rfc-style,
+   stdenvNoCC,
+}:
+
+writeTextFile {
+   name = "nixfmt-3-space";
+   executable = true;
+   destination = "/bin/nixfmt";
+   text = /* sh */ ''
+      #!${lib.getExe dash}
+      exec ${lib.getExe nixfmt-rfc-style} --indent=3 "$@"
+   '';
+   checkPhase = ''
+      runHook preCheck
+      ${stdenvNoCC.shellDryRun} "$target"
+      runHook postCheck
+   '';
+   meta.mainProgram = "nixfmt";
+}
diff --git a/nix/package/nixtamal.nix b/nix/package/nixtamal.nix
new file mode 100644
index 0000000..40806e2
--- /dev/null
+++ b/nix/package/nixtamal.nix
@@ -0,0 +1,95 @@
+#──────────────────────────────────────────────────────────────────────────────┐
+# SPDX-FileCopyrightText: 2025 toastal <https://toast.al/contact/>             │
+# SPDX-License-Identifier: LGPL-2.1-or-later                                   │
+#──────────────────────────────────────────────────────────────────────────────┘
+{
+   lib,
+   coreutils,
+   python3Packages,
+   nix-prefetch-darcs,
+   nix-prefetch-git,
+   nix-prefetch-pijul,
+   ocamlPackages,
+}:
+
+ocamlPackages.buildDunePackage {
+   pname = "nixtamal";
+   version = "0.0.1-alpha.1";
+
+   src =
+      let
+         fs = lib.fileset;
+
+         ocaml_project =
+            file:
+            lib.lists.elem file.name [
+               "dune"
+               "dune-project"
+               "dune-workspace"
+            ]
+            || file.hasExt "opam";
+
+         ocaml_src =
+            file:
+            lib.lists.any file.hasExt [
+               "ml"
+               "mld"
+               "mli"
+               "mly"
+            ];
+      in
+      fs.toSource {
+         root = ../..;
+         fileset = fs.unions [
+            ../../LICENSE.txt
+            (fs.fileFilter (file: file.hasExt "txt") ../../license)
+            (fs.fileFilter ocaml_project ../..)
+            (fs.fileFilter ocaml_src ../../bin)
+            (fs.fileFilter ocaml_src ../../lib)
+            (fs.fileFilter ocaml_src ../../test)
+         ];
+      };
+
+   nativeBuildInputs = [
+      python3Packages.docutils
+      # NOTE: no KDL support
+      python3Packages.pygments
+   ];
+
+   buildInputs = [
+      # required since the prefetcher scripts presently don’t specify all of
+      # their inputs
+      coreutils
+      nix-prefetch-darcs
+      nix-prefetch-git
+      nix-prefetch-pijul
+   ]
+   ++ (with ocamlPackages; [
+      cmdliner
+      eio
+      eio_main
+      fmt
+      jingoo
+      (jsont.override {
+         withBrr = false;
+         withBytesrw = true;
+      })
+      kdl
+      logs
+      ppx_deriving
+      saturn
+      uri
+   ]);
+
+   doCheck = false; # TODO
+
+   checkInputs = with ocamlPackages; [
+      alcotest
+   ];
+
+   meta = {
+      license = with lib.licenses; [ gpl3Plus ];
+      platforms = lib.platforms.unix;
+      mainProgram = "nixtamal";
+   };
+}
diff --git a/nix/package/ocamlformat-rpc-bin.nix b/nix/package/ocamlformat-rpc-bin.nix
new file mode 100644
index 0000000..935c314
--- /dev/null
+++ b/nix/package/ocamlformat-rpc-bin.nix
@@ -0,0 +1,16 @@
+#──────────────────────────────────────────────────────────────────────────────┐
+# SPDX-FileCopyrightText: 2025 toastal <https://toast.al/contact/>             │
+# SPDX-License-Identifier: LGPL-2.1-or-later                                   │
+#──────────────────────────────────────────────────────────────────────────────┘
+# I don’t like ocamlformat as it doesn’t have tab support despite OCaml fully
+# supporting tabs — so I use Topiary. However, the OCaml LSP requires
+{
+   lib,
+   runCommand,
+   ocamlformat,
+}:
+
+runCommand "extract-ocamlformat-rpc-bin" { } ''
+   mkdir -p $out/bin
+   cp ${lib.getBin ocamlformat}/bin/ocamlformat-rpc $out/bin/
+''