modify helix package and add idris tree-sitter integration

pkgs/helix/grammars/default.nix

@@ -0,0 +1,94 @@
+{ lib, pkgs, ... }:
+let
+  inherit (pkgs) stdenv;
+  buildGrammar =
+    grammar:
+    let
+      source = sources."${grammar.name}";
+    in
+    stdenv.mkDerivation {
+      pname = "helix-tree-sitter-${grammar.name}";
+      version = grammar.rev;
+      src = source;
+      sourceRoot = "source";
+
+      dontConfigue = true;
+
+      FLAGS = [
+        "-Isrc"
+        "-g"
+        "-O3"
+        "-fPIC"
+        "-fno-exceptions"
+        "-Wl,-z,relro,-z,now"
+      ];
+
+      NAME = grammar.name;
+
+      buildPhase = ''
+        runHook preBuild
+
+        if [[ -e src/scanner.cc ]]; then
+          $CXX -c src/scanner.cc -o scanner.o $FLAGS
+        elif [[ -e src/scanner.c ]]; then
+          $CC -c src/scanner.c -o scanner.o $FLAGS
+        fi
+
+        $CC -c src/parser.c -o parser.o $FLAGS
+        $CXX -shared -o $NAME.so *.o
+
+        ls -al
+
+        runHook postBuild
+      '';
+
+      installPhase = ''
+        runHook preInstall
+
+        mkdir $out
+        mv $NAME.so $out/
+
+        runHook postInstall
+      '';
+
+      fixupPhase = lib.optionalString stdenv.isLinux ''
+        runHook preFixup
+
+        $STRIP $out/$NAME.so
+
+        runHook postFixup
+      '';
+    };
+  grammars = map (file: import file) grammarFiles;
+  sources = lib.listToAttrs (
+    map (grammar: {
+      inherit (grammar) name;
+      value = builtins.fetchTree {
+        type = "github";
+        inherit (grammar) owner repo rev; };
+    }) grammars
+  );
+  queries = lib.mapAttrsToList (name: value: ''
+    mkdir -p $out/queries/${name}
+    cp ${value}/queries/* $out/queries/${name}/
+  '') sources;
+  runtime = pkgs.runCommand "helix-default-runtime" { } ''
+    mkdir -p $out
+    ${builtins.concatStringsSep "\n" queries}
+  '';
+  builtGrammars = lib.listToAttrs (
+    map (grammar: {
+      inherit (grammar) name;
+      value = buildGrammar grammar;
+    }) grammars
+  );
+  grammarFiles = [
+    ./idris.nix
+  ];
+in
+{
+  overlays = [
+    (final: prev: lib.filterAttrs (n: v: !(builtins.hasAttr n prev)) builtGrammars)
+  ];
+  inherit runtime;
+}