LSP Servers

SlopCode integrates with your Language Server Protocol (LSP) to help the LLM interact with your codebase. It uses diagnostics to provide feedback to the LLM.

Built-in

SlopCode comes with several built-in LSP servers for popular languages:

LSP Server	Extensions	Requirements
astro	.astro	Auto-installs for Astro projects
bash	.sh, .bash, .zsh, .ksh	Auto-installs bash-language-server
clangd	.c, .cpp, .cc, .cxx, .c++, .h, .hpp, .hh, .hxx, .h++	Auto-installs for C/C++ projects
csharp	.cs	`.NET SDK` installed
clojure-lsp	.clj, .cljs, .cljc, .edn	`clojure-lsp` command available
dart	.dart	`dart` command available
deno	.ts, .tsx, .js, .jsx, .mjs	`deno` command available (auto-detects deno.json/deno.jsonc)
elixir-ls	.ex, .exs	`elixir` command available
eslint	.ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts, .vue	`eslint` dependency in project
fsharp	.fs, .fsi, .fsx, .fsscript	`.NET SDK` installed
gleam	.gleam	`gleam` command available
gopls	.go	`go` command available
hls	.hs, .lhs	`haskell-language-server-wrapper` command available
jdtls	.java	`Java SDK (version 21+)` installed
julials	.jl	`julia` and `LanguageServer.jl` installed
kotlin-ls	.kt, .kts	Auto-installs for Kotlin projects
lua-ls	.lua	Auto-installs for Lua projects
nixd	.nix	`nixd` command available
ocaml-lsp	.ml, .mli	`ocamllsp` command available
oxlint	.ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts, .vue, .astro, .svelte	`oxlint` dependency in project
php intelephense	.php	Auto-installs for PHP projects
prisma	.prisma	`prisma` command available
pyright	.py, .pyi	`pyright` dependency installed
ruby-lsp (rubocop)	.rb, .rake, .gemspec, .ru	`ruby` and `gem` commands available
rust	.rs	`rust-analyzer` command available
sourcekit-lsp	.swift, .objc, .objcpp	`swift` installed (`xcode` on macOS)
svelte	.svelte	Auto-installs for Svelte projects
terraform	.tf, .tfvars	Auto-installs from GitHub releases
tinymist	.typ, .typc	Auto-installs from GitHub releases
typescript	.ts, .tsx, .js, .jsx, .mjs, .cjs, .mts, .cts	`typescript` dependency in project
vue	.vue	Auto-installs for Vue projects
yaml-ls	.yaml, .yml	Auto-installs Red Hat yaml-language-server
zls	.zig, .zon	`zig` command available

LSP servers are automatically enabled when one of the above file extensions are detected and the requirements are met.

How It Works

When slopcode opens a file, it:

Checks the file extension against all enabled LSP servers.
Starts the appropriate LSP server if not already running.

Configure

You can customize LSP servers through the lsp section in your slopcode config.

{
  "$schema": "https://slopcode.dev/config.json",
  "lsp": {}
}

Each LSP server supports the following:

Property	Type	Description
`disabled`	boolean	Set this to `true` to disable the LSP server
`command`	string[]	The command to start the LSP server
`extensions`	string[]	File extensions this LSP server should handle
`env`	object	Environment variables to set when starting server
`initialization`	object	Initialization options to send to the LSP server

Let’s look at some examples.

Environment variables

Use the env property to set environment variables when starting the LSP server:

{
  "$schema": "https://slopcode.dev/config.json",
  "lsp": {
    "rust": {
      "env": {
        "RUST_LOG": "debug"
      }
    }
  }
}

Initialization options

Use the initialization property to pass initialization options to the LSP server. These are server-specific settings sent during the LSP initialize request:

{
  "$schema": "https://slopcode.dev/config.json",
  "lsp": {
    "typescript": {
      "initialization": {
        "preferences": {
          "importModuleSpecifierPreference": "relative"
        }
      }
    }
  }
}

Disabling LSP servers

To disable all LSP servers globally, set lsp to false:

{
  "$schema": "https://slopcode.dev/config.json",
  "lsp": false
}

To disable a specific LSP server, set disabled to true:

{
  "$schema": "https://slopcode.dev/config.json",
  "lsp": {
    "typescript": {
      "disabled": true
    }
  }
}

Custom LSP servers

You can add custom LSP servers by specifying the command and file extensions:

{
  "$schema": "https://slopcode.dev/config.json",
  "lsp": {
    "custom-lsp": {
      "command": ["custom-lsp-server", "--stdio"],
      "extensions": [".custom"]
    }
  }
}

Additional Information

PHP Intelephense

PHP Intelephense offers premium features through a license key. You can provide a license key by placing (only) the key in a text file at:

On macOS/Linux: $HOME/intelephense/license.txt
On Windows: %USERPROFILE%/intelephense/license.txt

The file should contain only the license key with no additional content.