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Alex Spinov
Alex Spinov

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Lapce Editor Has a Free API You've Never Heard Of

#lapce #rust #editor #webassembly

Lapce is a lightning-fast code editor written in Rust with native GUI performance. Built on the Floem UI library and powered by Xi-Editor's rope science, it's designed to be the fastest editor you've ever used.

Why Lapce Is Different

  • Native performance — written in Rust with GPU rendering via wgpu
  • Remote development — built-in remote editing over SSH
  • WASI plugin system — plugins run in WebAssembly sandboxes
  • Modal editing — Vim mode built-in, not bolted on

The Hidden API: WASI Plugin System

Lapce's plugin system uses WebAssembly (WASI), giving you a sandboxed API to extend the editor:

use lapce_plugin::*;

#[plugin]
fn initialize(params: InitializeParams) -> Result<()> {
    // Register custom commands
    register_command("my-tool.analyze", |_| {
        let doc = get_active_document()?;
        let content = doc.get_text()?;
        // Your analysis logic here
        show_message(format!("Lines: {}", content.lines().count()));
        Ok(())
    });
    Ok(())
}
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This means you can:

  • Build custom code analysis tools that run AT NATIVE SPEED
  • Create language-specific tooling without external processes
  • Share plugins as portable WASM binaries

Remote Development API

Lapce's proxy architecture gives you a free remote development API:

# Start Lapce proxy on remote server
lapce-proxy --port 8080

# Connect from local Lapce
# Settings → Remote → Add SSH connection
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The proxy handles:

  • File system operations over SSH
  • LSP forwarding
  • Terminal multiplexing
  • Git operations

Built-in LSP Integration 

# settings.toml
[lapce-rust-analyzer]
enable = true
cargo.allFeatures = true
checkOnSave.command = "clippy"

[lapce-python]
server = "pylsp"
format.provider = "black"
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Quick Start 

# Install
brew install --cask lapce
# or download from https://lapce.dev

# Install a plugin
lapce plugin install lapce-rust
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Real-World Impact

A DevOps engineer shared: "I replaced VS Code with Lapce for remote editing. SSH into production servers, edit configs, and the latency is imperceptible. It feels local even on 200ms connections."

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Have you tried Lapce? What's your take on Rust-based editors?

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