helix: ship nix-shell syntax highlighting

pkgs/additional/tree-sitter-nix-shell/default.nix

@@ -2,6 +2,7 @@
 , fetchFromGitea
 , htmlq
 , tree-sitter
+, tree-sitter-nix-shell
 }:
 
 tree-sitter.buildGrammar {
@@ -24,6 +25,15 @@ tree-sitter.buildGrammar {
   '';
   doCheck = true;
 
+  passthru = {
+    generated = tree-sitter-nix-shell.overrideAttrs (orig: {
+      # provide a package which has the output of `tree-sitter generate`, but not the binary compiled parser
+      buildPhase = "true";
+      installPhase = "cp -r . $out";
+      checkPhase = "true";
+    });
+  };
+
   meta = with lib; {
     description = "parse `#!/usr/bin/env nix-shell` scripts with tree-sitter";
     homepage = "https://git.uninsane.org/colin/tree-sitter-nix-shell";

pkgs/default.nix

@@ -97,6 +97,8 @@ let
 
     gocryptfs = callPackage ./patched/gocryptfs { inherit (unpatched) gocryptfs; };
 
+    helix = callPackage ./patched/helix { inherit (unpatched) helix; };
+
     # jackett doesn't allow customization of the bind address: this will probably always be here.
     jackett = callPackage ./patched/jackett { inherit (unpatched) jackett; };
 

pkgs/patched/helix/default.nix

@@ -0,0 +1,24 @@
+{ helix
+, rsync
+, substituteAll
+, tree-sitter-nix-shell
+}:
+
+let
+  languages = substituteAll {
+    src = ./languages.toml;
+    tree_sitter_nix_shell = tree-sitter-nix-shell.generated;
+  };
+in
+helix.overrideAttrs (upstream: {
+  configurePhase = (upstream.configurePhase or "") + ''
+    cat ${languages} >> languages.toml
+    substituteAllInPlace languages.toml
+
+    ${rsync}/bin/rsync -arv ${tree-sitter-nix-shell.generated}/ runtime/grammars/sources/nix-shell/
+    ${rsync}/bin/rsync -arv ${tree-sitter-nix-shell}/queries/ runtime/queries/nix-shell/
+
+    # helix tries to delete the sources during installPhase
+    chmod -R +w runtime/grammars/sources/nix-shell
+  '';
+})

pkgs/patched/helix/languages.toml

@@ -0,0 +1,22 @@
+# Helix text-editor interprets this file as documented here:
+# - <https://github.com/helix-editor/helix/blob/master/book/src/languages.md>
+#
+# hack in support for nix-shell documents
+# these have a shebang of `#!/usr/bin/env nix-shell`
+# and a subsequent line: `#!nix-shell -i <lang> [args]`
+[[language]]
+name = "nix-shell"
+scope = "source.nix_shell"
+shebangs = [ "nix-shell" ]
+file-types = [ "nix-shell" ]
+injection-regex = "nix-shell"
+indent = { tab-width = 2, unit = " " }
+roots = []
+grammar = "nix-shell"
+
+[[grammar]]
+name = "nix-shell"
+source = { path = "@tree_sitter_nix_shell@" }
+# source = { path = "/home/colin/dev/tree-sitter-nix-shell" }
+# source = { git = "https://git.uninsane.org/colin/tree-sitter-nix-shell", rev = "c2fcc8b6ee91af2cb58a38f62c0800f82d783738" }
+