ci: use nix-run to generate docs + create doc directory

.github/workflows/docgen.yml

@@ -18,7 +18,7 @@ jobs:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
       - name: Generating docs
-        run: nix-shell --command ht-generate-docs
+        run: nix run ".#docgen"
 
       - name: Update documentation
         env:

flake.nix

@@ -97,7 +97,6 @@
     shellFor = system: let
       pkgs = pkgsFor system;
       pre-commit-check = pre-commit-check-for system;
-      docgen = pkgs.callPackage ./nix/docgen.nix {};
     in
       pkgs.mkShell {
         name = "haskell-tools.nvim-shell";
@@ -106,7 +105,6 @@
           zlib
           alejandra
           stylua
-          docgen
         ];
       };
   in {
@@ -120,9 +118,13 @@
       haskell-tools = shellFor system;
     });
 
-    packages = perSystem (system: rec {
-      default = haskell-tools-nvim;
+    packages = perSystem (system: let
+      pkgs = pkgsFor system;
       haskell-tools-nvim = haskell-tools-nvim-for system;
+      docgen = pkgs.callPackage ./nix/docgen.nix {};
+    in {
+      default = haskell-tools-nvim;
+      inherit docgen haskell-tools-nvim;
     });
 
     checks = perSystem (system: let

nix/docgen.nix

@@ -1,10 +1,11 @@
 {pkgs, ...}:
 pkgs.writeShellApplication {
-  name = "ht-generate-docs";
+  name = "docgen";
   runtimeInputs = with pkgs; [
     lemmy-help
   ];
   text = ''
-    lemmy-help lua/haskell-tools/{init,config,log,lsp,hoogle,repl,project,tags}.lua lua/telescope/_extensions/ht.lua > doc/haskell-tools.txt
+    mkdir -p doc
+    lemmy-help lua/haskell-tools/{init,config,lsp,hoogle,repl,project,tags,log}.lua lua/telescope/_extensions/ht.lua > doc/haskell-tools.txt
   '';
 }