LSP working for Julia oh my god that was terrible

backend/src/langs.ts

@@ -518,6 +518,7 @@ PLEASE GIVE UP
     repl: "julia",
     main: "main.jl",
     run: "julia -L main.jl",
+    lsp: `JULIA_DEPOT_PATH=:/opt/julia julia -e 'using LanguageServer; run(LanguageServerInstance(stdin, stdout))'`,
     template: `println("Hello, world!")
 `,
   },

frontend/src/app.ts

@@ -84,6 +84,9 @@ class RijuMessageWriter extends AbstractMessageWriter {
   }
 
   write(msg: Message): void {
+    if ((msg as any).method === "initialize") {
+      (msg as any).params.processId = null;
+    }
     if (DEBUG) {
       console.log("SEND LSP:", msg);
     }
@@ -184,8 +187,11 @@ async function main() {
               documentSelector: [{ pattern: "**" }],
               middleware: {
                 workspace: {
-                  configuration: () => {
-                    return [config.lspConfig || {}];
+                  configuration: (params, token, configuration) => {
+                    (window as any).config = configuration;
+                    return Array(
+                      (configuration(params, token) as {}[]).length
+                    ).fill(config.lspConfig || null);
                   },
                 },
               },

scripts/docker-install-phase4.bash

@@ -5,6 +5,10 @@ set -o pipefail
 set -x
 
 # Needed for project infrastructure
+cd /tmp
+mkdir /opt/julia
+export JULIA_DEPOT_PATH=/opt/julia
+
 npm config set unsafe-perm true
 PERL_MM_USE_DEFAULT=1 cpan App::cpanminus
 rm -rf /tmp/cpan_install_*.txt
@@ -37,6 +41,9 @@ npm install -g @kachkaev/run-elm
 # FORTRAN
 pip3 install fortran-language-server
 
+# Julia
+julia -e 'using Pkg; Pkg.add("LanguageServer")'
+
 # Perl
 cpanm -n Devel::REPL