Language Server Protocol Support for Emacs

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Why?

• ❤️ Community Driven
• 💎 Fully featured - supports all features in Language Server Protocol v3.14.
• 🚀 Fast - see performance section.
• 🌟 Flexible - choose between full-blown IDE with flashy UI or minimal distraction free.
• ⚙️ Easy to configure - works out of the box and automatically upgrades if additional packages are present.

Overview

Client for Language Server Protocol (v3.14). lsp-mode aims to provide IDE-like experience by providing optional integration with the most popular Emacs packages like company, flycheck and projectile.

• Non-blocking asynchronous calls
• Real-time Diagnostics/linting via flycheck (recommended) or flymake when Emacs > 26 (requires flymake>=1.0.5)
• Code completion - company-capf / completion-at-point (note that company-lsp is no longer supported).
• Hovers - using lsp-ui
• Code actions - using lsp-execute-code-action or lsp-ui sideline.
• Code outline - using builtin imenu or helm-imenu
• Code navigation - using builtin xref, lsp-treemacs tree views or lsp-ui peek functions.
• Code lens
• Symbol highlights
• Formatting
• Debugger - dap-mode
• Helm integration - helm-lsp
• Ivy integration - lsp-ivy
• Treemacs integration - lsp-treemacs
• Semantic highlighting (using either the theia semantic highlighting protocol as implemented by JDT LS and some versions of clangd, or the semantic tokens protocol defined by LSP 3.16)
• which-key integration for better discovery

Presentations/demos

• skybert's emacsconf presentation (Java)
• thatwist's ScalaUA Conference presentation (Scala)

See also

• lsp-docker - provide docker image with preconfigured language servers with corresponding emacs configuration.
• company-box - company frontend with icons.
• dap-mode - Debugger integration for lsp-mode.
• eglot - An alternative minimal LSP implementation.
• which-key - Emacs package that displays available keybindings in popup
• projectile - Project Interaction Library for Emacs

Contributions

Contributions are very much welcome.

Members

Here it is a list of the current lsp-mode members and what they are primary working on/responsible for.

totbwf F#	brotzeit Rust	dsyzling Scala	kurnevsky Scala | Rust	seagle0128 Go | Python MS
sebastiansturm lsp-mode core | C++	vibhavp lsp-mode core	yyoncho lsp-mode core | Java	ericdallo Dart | Flutter | docs	danielmartin C++ | Swift