Note that I am using the command python3 as the executable command, in case both Python 2 and 3 are installed on the system. The following is the snippet to automatically download the client and set it up. We will need a thin layer of extra client, lsp-pyright, to sit atop lsp-mode and leverage pyright’s features. You can install pyright globally with pip, npm, or your system’s package manager. I’ve heard good things about Sypder IDE’s server but I have yet to try it. Pyright is my choice of language server for Python. LSP-mode supports 5 different Python language servers, namely Spyder IDE’s python-lsp-server, the Jedi language server, Palantir’s pyls, Microsoft’s Pyright language server, and Microsoft’s Python language server. For lsp-mode to prioritize ccls over clangd, you need to install and set up this extra client that leverages lsp-mode.Įmacs detecting typos and suggesting fixes, powered by LSP. If for some reason you don’t like LLVM’s implementation, you can try out ccls, an alternative language server for C/C++/ObjC. “Clangd” is a language server developed by LLVM (which also develops the clang compilers) and can be downloaded with brew install llvm on macOS, or pacman -S clang on Arch.Ĭlangd is my choice of language server for both C and C++. Setting up C++īy default, lsp-mode will look for the “clangd” executable on the path. We’ll continue to use C++, Python, Java, and JavaScript as examples since they seem to be the most popular languages. Now that we have the client installed and initialized, we need to provide Emacs with the respective language servers so lsp-mode can pick up the channels of communication. ( use-package lsp-ui :commands lsp-ui-mode :config ( setq lsp-ui-doc-enable nil ) ( setq lsp-ui-doc-header t ) ( setq lsp-ui-doc-include-signature t ) ( setq lsp-ui-doc-border ( face-foreground 'default )) ( setq lsp-ui-sideline-show-code-actions t ) ( setq lsp-ui-sideline-delay 0.05 )) Servers for LSP If you need help setting up use-package, I also wrote a post on this topic. To install lsp-mode from MELPA for Emacs, you can use the following use-package declaration. In the rest of this post, I will be using lsp-mode as my client to demonstrate the configurations of making Emacs an intelligent editor. As an Emacs user, I have tried out both lsp-mode and eglot, and found the former more configurable, feature-rich, and easy to wrap my head about. In the Emacs community, the equivalent would be lsp-mode and eglot. In the Vim/Neovim world, the main players are CoC and the native LSP client of Neovim. Similarly, if I install the same language server that powers the sweet code actions for TypeScript/JavaScript in VSCode and hooks it to my editor’s client, I wouldn’t lose anything by not using VSCode. In other words, if my “primitive” editor has a thin layer of a client that can communicate with, say, the Java language server of the Eclipse IDE, my editor can obtain all the smart features that are exposed by the server and instantly be on par with Eclipse. Company and company-box are used to provide the auto-completion UI.Īll of a sudden, as long as you have a client in your editor that can communicate with the language servers, which are separately downloaded, any tool can become as intelligent and feature-rich as the popular IDEs and smart editors. If you’d like to read more about the inner workings, consider this post.Įmacs showing language-aware auto-completion powered by the clangd language server. In short, LSP decouples the tooling into servers and clients, with the former powering all the intelligent activities, and the latter being integrated into any development tool of your choice. That said, everything changed when Microsoft released its development of the Language Server Protocol. After all, this requires a deep understanding of both the programming language and the code, which is the main reason why IDEs are created in the first place. When compared with modern editors and IDEs (such as IntelliJ IDEA, P圜harm, and Visual Studio Code), old-school editors like Emacs or Vim fail to provide intelligent actions such as “auto-complete (Intellisense)”, “go to definition/references”, and “on-the-fly error checking” out-of-the-box. This post introduces the combination of Emacs and LSP, and how you can make your own editor “smarter” by using the same idea of communications between an editor client and multiple language servers.Įdit: Thank you for the support, this blog post got featured on the front page of Hacker News (YCombinator).
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