chore!(nix): add topiary-cli-nix build output

This build output uses the grammars from nixpkgs over those provided by
topiary itself.

default.nix

@@ -24,6 +24,7 @@ let
         "Cargo.lock"
         "Cargo.toml"
         "languages.ncl"
+        "languages_nix.ncl"
         "tests"
         "topiary-core"
         "topiary-cli"
@@ -106,12 +107,33 @@ in
     cargoExtraArgs = "-p topiary-core";
   });
 
-  topiary-cli = craneLib.buildPackage (commonArgs
+  topiary-cli = { nixSupport ? false }: craneLib.buildPackage (commonArgs
     // {
     inherit cargoArtifacts;
     pname = "topiary";
     cargoExtraArgs = "-p topiary-cli";
     cargoTestExtraArgs = "--no-default-features";
+
+
+    preConfigurePhases = pkgs.lib.optional nixSupport "useNixConfiguration";
+
+    # ocamllex is not (yet) packaged in nixpkgs
+    # ocamllex="${pkgs.tree-sitter-grammars.tree-sitter-ocamllex}/parser" \
+    useNixConfiguration = ''
+      bash="${pkgs.tree-sitter-grammars.tree-sitter-bash}/parser" \
+      css="${pkgs.tree-sitter-grammars.tree-sitter-css}/parser" \
+      json="${pkgs.tree-sitter-grammars.tree-sitter-json}/parser" \
+      nickel="${pkgs.tree-sitter-grammars.tree-sitter-nickel}/parser" \
+      ocaml="${pkgs.tree-sitter-grammars.tree-sitter-ocaml}/parser" \
+      ocaml_interface="${pkgs.tree-sitter-grammars.tree-sitter-ocaml-interface}/parser" \
+      rust="${pkgs.tree-sitter-grammars.tree-sitter-rust}/parser" \
+      toml="${pkgs.tree-sitter-grammars.tree-sitter-toml}/parser" \
+      tree_sitter_query="${pkgs.tree-sitter-grammars.tree-sitter-query}/parser" \
+      substituteAllInPlace topiary-config/languages_nix.ncl
+
+      mv topiary-config/languages_nix.ncl topiary-config/languages.ncl
+    '';
+
     postInstall = ''
       install -Dm444 topiary-queries/queries/* -t $out/share/queries
     '';

flake.nix

@@ -59,13 +59,15 @@
         binPkgs = pkgs.callPackage ./bin/default.nix { };
       in
       {
-        packages = {
+        packages = rec {
           inherit (topiaryPkgs)
-            topiary-cli
             topiary-playground
             topiary-queries
             client-app;
 
+          topiary-cli = topiaryPkgs.topiary-cli { };
+          topiary-cli-nix = topiaryPkgs.topiary-cli { nixSupport = true; };
+
           inherit (binPkgs)
             # FIXME: Broken
             # generate-coverage
@@ -74,11 +76,12 @@
             update-wasm-grammars
             verify-documented-usage;
 
-          default = topiaryPkgs.topiary-cli;
+          default = topiary-cli;
         };
 
         checks = {
-          inherit (topiaryPkgs) clippy clippy-wasm fmt topiary-core topiary-cli topiary-playground audit benchmark;
+          inherit (topiaryPkgs) clippy clippy-wasm fmt topiary-core topiary-playground audit benchmark;
+          topiary-cli = topiaryPkgs.topiary-cli { };
 
           ## Check that the `lib.pre-commit-hook` output builds/evaluates
           ## correctly. `deepSeq e1 e2` evaluates `e1` strictly in depth before
@@ -90,7 +93,8 @@
         devShells =
           let
             checksLight = {
-              inherit (topiaryPkgs) clippy fmt topiary-core topiary-cli;
+              inherit (topiaryPkgs) clippy fmt topiary-core;
+              topiary-cli = topiaryPkgs.topiary-cli { };
             };
           in
           {
@@ -104,7 +108,7 @@
           enable = true;
           name = "topiary";
           description = "A general code formatter based on tree-sitter.";
-          entry = "${topiaryPkgs.topiary-cli}/bin/topiary fmt";
+          entry = "${topiaryPkgs.topiary-cli {}}/bin/topiary fmt";
           types = [ "text" ];
         };
       }

languages_nix.ncl

@@ -0,0 +1 @@
+topiary-config/languages_nix.ncl

topiary-config/languages_nix.ncl

@@ -0,0 +1,72 @@
+{
+  languages = {
+    bash = {
+      extensions = ["sh", "bash"],
+      grammar.source.path = "@bash@",
+    },
+
+    css = {
+      extensions = ["css"],
+      grammar.source.path = "@css@",
+    },
+
+    json = {
+      extensions = [
+          "json",
+          "avsc",
+          "geojson",
+          "gltf",
+          "har",
+          "ice",
+          "JSON-tmLanguage",
+          "jsonl",
+          "mcmeta",
+          "tfstate",
+          "tfstate.backup",
+          "topojson",
+          "webapp",
+          "webmanifest"
+        ],
+      grammar.source.path = "@json@",
+    },
+
+    nickel = {
+      extensions = ["ncl"],
+      grammar.source.path = "@nickel@",
+    },
+
+    ocaml = {
+      extensions = ["ml"],
+      grammar.source.path = "@ocaml@",
+    },
+
+    ocaml_interface = {
+      extensions = ["mli"],
+      grammar.source.path = "@ocaml_interface@",
+    },
+
+    # ocamllex = {
+    #   extensions = ["mll"],
+    #   grammar.source.path = "@ocamllex@",
+    # },
+
+    rust = {
+      extensions = ["rs"],
+      indent = "    ", # 4 spaces
+      grammar.source.path = "@rust@",
+    },
+
+    toml = {
+      extensions = ["toml"],
+      grammar.source.path = "@toml@",
+    },
+
+    tree_sitter_query = {
+      extensions = ["scm"],
+      grammar = {
+        source.path = "@tree_sitter_query@",
+        symbol = "tree_sitter_query",
+      },
+    },
+  },
+}