Turn program into a flake

default.nix

@@ -1,4 +1,4 @@
-{ bundlerEnv, ruby, stdenv }:
+{ bundlerEnv, ruby, stdenv, katex-server }:
 
 let
   gems = bundlerEnv {
@@ -13,14 +13,18 @@ in
   stdenv.mkDerivation {
     name = "katex-converter";
     src = ./convert.rb;
-    buildInputs = [ gems ruby ];
+    buildInputs = [ katex-server gems ruby ];
     unpackPhase = "echo 'Skipping unpack phase (nothing to unpack)'";
     installPhase = ''
       mkdir -p $out/{bin,share/katex-converter}
       cp $src $out/share/katex-converter/convert.rb
 	cat > $out/bin/katex-converter <<EOF
 #!/bin/sh -e
-exec ${gems}/bin/bundle exec ${ruby}/bin/ruby $out/share/katex-converter/convert.rb \$@
+${katex-server}/bin/katex-server &
+server_pid=\$!
+sleep 1
+${gems}/bin/bundle exec ${ruby}/bin/ruby $out/share/katex-converter/convert.rb \$@
+kill -KILL \$server_pid
 EOF
       chmod +x $out/bin/katex-converter
     '';

flake.lock

@@ -0,0 +1,92 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "katex-server": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1648429554,
+        "narHash": "sha256-jNRd9gzrOIYlvuVr/Je2Uh6/FXRoGwAIjgVHhf2NOoE=",
+        "ref": "master",
+        "rev": "a277542d9b7eb23806b123aed41a0bd441ff669b",
+        "revCount": 4,
+        "type": "git",
+        "url": "https://dev.danilafe.com/Nix-Configs/katex-server"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://dev.danilafe.com/Nix-Configs/katex-server"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1648425779,
+        "narHash": "sha256-0tcpEiiq3f3Hh77ax7QFuF15AnPaBIdDSbvrCUeyb9k=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "1edfe6d91bd8348cfccacd72e82d1d06ad470117",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1648425779,
+        "narHash": "sha256-0tcpEiiq3f3Hh77ax7QFuF15AnPaBIdDSbvrCUeyb9k=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "1edfe6d91bd8348cfccacd72e82d1d06ad470117",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "katex-server": "katex-server",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,20 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+    katex-server.url = "git+https://dev.danilafe.com/Nix-Configs/katex-server";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, katex-server }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+          katex-html = pkgs.callPackage ./default.nix { katex-server = katex-server.defaultPackage.${system}; };
+        in
+          {
+            packages = { inherit katex-html; };
+	    defaultPackage = katex-html;
+          }
+    );
+}