Add flake build

.envrc

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+use flake

.gitignore

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+.direnv

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1697009197,
+        "narHash": "sha256-viVRhBTFT8fPJTb1N3brQIpFZnttmwo3JVKNuWRVc3s=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "01441e14af5e29c9d27ace398e6dd0b293e25a54",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Tree sitter collection";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (sys:
+      let pkgs = nixpkgs.legacyPackages.${sys};
+          deps = [ pkgs.tree-sitter pkgs.nodejs pkgs.gcc ];
+
+          compile-tree-sitter = { src, name }: pkgs.stdenv.mkDerivation {
+            # inherit src name;
+            src = src;
+            name = name;
+
+            nativeBuildInputs = deps;
+
+            buildPhase = ''
+              tree-sitter generate
+            '';
+
+            installPhase = ''
+              mkdir -p "$out"
+              cp -r src "$out/src"
+              touch src/scanner.c
+
+              gcc -c src/parser.c -o parser.o
+              gcc -c src/scanner.c -o scanner.o
+              ar rcs "$out/parser.a" parser.o scanner.o
+
+              gcc -shared src/scanner.c src/parser.c -o "$out/lib-tree-sitter-$name.so"
+            '';
+
+            # TODO: Get tests working
+            # For some reason, just doing tree-sitter test fails with "read-only file system"
+          };
+
+      in rec {
+        packages.agda = compile-tree-sitter { src = ./agda; name = "agda"; };
+        packages.bash = compile-tree-sitter { src = ./bash; name = "bash"; };
+        packages.c = compile-tree-sitter { src = ./c; name = "c"; };
+        packages.nix = compile-tree-sitter { src = ./nix; name = "nix"; };
+        packages.python = compile-tree-sitter { src = ./python; name = "python"; };
+        packages.rust = compile-tree-sitter { src = ./rust; name = "rust"; };
+      }
+    );
+}