Package kotlin-language-server and jdtls again

flake.nix

@@ -15,14 +15,23 @@
     utils.url = "github:gytis-ivaskevicius/flake-utils-plus/master";
   };
 
-  outputs = inputs@{ self, nixpkgs, agenix, emacs-overlay, home-manager, utils }: utils.lib.systemFlake {
+  outputs = inputs@{ self, nixpkgs, agenix, emacs-overlay, home-manager, utils }:
+    let
+      customPackages = callPackage: {
+        jdtls = callPackage ./packages/jdtls { };
+        kotlin-language-server = callPackage ./packages/kotlin-language-server { };
+      }; in
+    utils.lib.systemFlake {
       inherit self inputs;
       # This config can only be evaluated on x86_64-linux because of IFD
       supportedSystems = [ "x86_64-linux" ];
       channels.nixpkgs = {
         input = nixpkgs;
         patches = map (patch: ./patches + "/${patch}") (builtins.filter (x: x != ".keep") (builtins.attrNames (builtins.readDir ./patches)));
-      overlaysBuilder = _: [ emacs-overlay.overlay ];
+        overlaysBuilder = _: [
+          emacs-overlay.overlay
+          (self: super: customPackages self.callPackage)
+        ];
       };
       hostDefaults = {
         modules = [
@@ -52,5 +61,7 @@
             agenix.defaultPackage.x86_64-linux
           ];
         };
+      packagesBuilder = channels:
+        let pkgs = channels.nixpkgs; in customPackages pkgs.callPackage;
     };
 }

modules/graphical.nix

@@ -36,6 +36,8 @@
     home-manager.users.charlotte = { ... }: {
       home.packages = with pkgs; [
         google-chrome
+        jdtls
+        kotlin-language-server
         libreoffice-fresh
         mpv
         okular

packages/jdtls/default.nix

@@ -0,0 +1,34 @@
+{ stdenv, bash, fetchurl, jdk11, ... }:
+
+stdenv.mkDerivation rec {
+  pname = "jdtls";
+  version = "1.1.2";
+  src = fetchurl {
+    url = "http://download.eclipse.org/${pname}/milestones/${version}/jdt-language-server-${version}-202105191944.tar.gz";
+    sha256 = "1drx4fs63jr1cbsya6smwfx8rxpdlwb9sg3y80xfnr80dh0mh2c4";
+  };
+  sourceRoot = ".";
+  buildPhase = "true";
+  installPhase = ''
+    mkdir -p $out/share/java/jdtls
+    mv config_* features plugins $out/share/java/jdtls
+    mkdir $out/bin
+    cat >$out/bin/jdtls <<HERE
+    #!${bash}/bin/bash
+    tmp_dir=\$(mktemp -d /tmp/jdtls.XXXXX)
+    cp -R $out/share/java/jdtls/config_linux \$tmp_dir
+    chmod -R u=rwX \$tmp_dir
+    trap "{ rm -rf \$tmp_dir; }" 0
+    ${jdk11}/bin/java \
+      -Declipse.application=org.eclipse.jdt.ls.core.id1 \
+      -Dosgi.bundles.defaultStartLevel=4 \
+      -Declipse.product=org.eclipse.jdt.ls.core.product \
+      -noverify \
+      -Xms1G \
+      -jar $out/share/java/jdtls/plugins/org.eclipse.equinox.launcher_*.jar \
+      -configuration "\$tmp_dir/config_linux" \
+      "\$@"
+    HERE
+    chmod +x $out/bin/jdtls
+  '';
+}

packages/kotlin-language-server/default.nix

@@ -0,0 +1,19 @@
+{ lib, stdenv, fetchzip, jdk11, makeWrapper, ... }:
+
+stdenv.mkDerivation rec {
+  pname = "kotlin-language-server";
+  version = "1.1.2";
+  src = fetchzip {
+    url = "https://github.com/fwcd/${pname}/releases/download/${version}/server.zip";
+    sha256 = "021h9239lr19r9r726hfjlfgwa8fl4m8vfryzsg8fbm0hsziklkz";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp -r $src/* $out/
+    chmod -R u=rwX $out
+    wrapProgram $out/bin/kotlin-language-server --set JAVA_HOME ${jdk11}
+  '';
+}