warpdotdev/warp: Add support for adding custom language servers

The gap in what exists

Warp users currently lack the flexibility to integrate language servers for niche or newly developed languages not supported out-of-the-box, forcing them to use other editors for those specific files.

Wedge to win

By providing a Neovim-like custom LSP configuration, Warp can appeal to developers who prefer its modern terminal features but are currently tied to other IDEs for full language support.

Reputation value (worth doing free for proof) — 70/100

A merged PR adding a highly requested feature to a popular and growing terminal like Warp would be strong proof of work for dev-tool clients, showcasing deep systems integration skills.

Likely monetization

unclear

Incumbents to beat

VS CodeNeovimEmacs

You are an expert Rust developer with experience contributing to large open-source projects. Your task is to implement support for custom Language Server Protocol (LSP) configurations in the `warpdotdev/warp` terminal application. The goal is to allow users to define external LSP binaries, their arguments, and associated file types within Warp's settings, similar to Neovim's LSP configuration.

Here's the plan:

1.  **Fork the `warpdotdev/warp` GitHub repository.**
2.  **Identify the existing LSP integration points:** Locate how Warp currently discovers, configures, and launches built-in language servers. Focus on files related to settings, language detection, and process management for LSPs.
3.  **Implement settings parsing for custom LSPs:** Add a new section to Warp's configuration file schema (likely TOML or JSON) that allows users to define custom LSPs. Each custom LSP entry should include `path_to_binary` (string), `arguments` (list of strings, optional), and `file_types` (list of strings, e.g., `["my_lang", "myl"]`).
4.  **Integrate custom LSPs into the LSP manager:** Modify Warp's internal LSP management system to load and register these custom configurations alongside the native ones. This might involve adapting an existing `LspClient` or similar abstraction.
5.  **Develop activation logic and UI prompt:** When a user opens a file whose type is associated with a custom LSP, detect this and display a non-intrusive prompt in the footer (e.g., 'Enable custom LSP for this file type?') with an option to activate it. This prompt should persist for the current session or until dismissed.
6.  **Error Handling:** Implement robust error handling for cases like missing binaries, invalid paths, or failed LSP startup.

**MVP Scope:** Focus on getting a single custom LSP (e.g., for a hypothetical 'mylang') to correctly launch and provide basic diagnostics (if supported by the custom server) when a `.mylang` file is opened and the user opts-in via the footer prompt.

**Stack:** The Warp project is primarily written in Rust. You will be working within the existing Rust codebase.

**Build/Verify Gate:** A custom LSP for a trivial language (e.g., one that just echoes text or provides basic linting) can be configured by the user via settings. When a file of that type is opened, Warp displays the 'enable server' prompt, and upon activation, the custom LSP process starts and interacts correctly with the editor buffer.