Neovim and Language Server Protocol (LSP)

Rust Setup for Neovim

Source: Rust Setup For Neovim (ft BashBunni) #bash2basics - YouTube with TJ DeVries

Installing rust

• Use rustup.rs
  • rustc, cargo
• Get Rust LSP: rust-analyzer

New rust project, look at rust files

# Install rust LSP
rustup component add rust-analyzer

# Create new project
cargo new projectname

# run project1
cd projectname
cargo run

Can prefer cargo run to check for errors

Getting lspconfig setup

What is an LSP?

• Language Server Protocol (LSP)
  • Just a program
• Helps your editor figure syntax of language, helps navigate

Example lsp.lua

lspconfig.rust_analyzer.setup {
  capabilities = capabilities,
  on_attach = on_attach,
  -- so it can find rust-analyzer
  cmd =  {
    "rustup", "run", "stable", "rust-analyzer"
  }
}

• Restart nvim
• Find help at lspconfig site or the LSP server site for the language on how to integrate

Testing out Rust basics

main.rs

fn main() {
    println!("{} world", "hello");
}

fn truthy() -> bool {
    return false;
}

#[cfg(test)]
mod test {
    use super::truthy;

    #[test]
    fn test_something() {
        assert_eq!(truthy(), true);
    }
}

Writing rust tests, cargo-watch

cargo test

# Install tool to monitor for file changes and then do tests
cargo install cargo-watch
# Tell cargo watch to run tests on source changes
cargo watch -x test
# During later changes to source code, tests will automatically be run