jedi-language-server 0.9.0

A language server for Jedi!

jedi-language-server

A Language Server for the latest version(s) of Jedi.

Note: this tool is actively used by its primary author. He's happy to review pull requests / respond to issues you may discover.

Installation

From your command line (bash / zsh), run:

pip install -U jedi-language-server

-U ensures that you're pulling the latest version from pypi.

Alternatively, consider using pipx to keep jedi-language-server isolated from your other Python dependencies.

Overview

jedi-language-server aims to support all of Jedi's capabilities and expose them through the Language Server Protocol. It currently supports the following Language Server requests:

• textDocument/completion
• textDocument/definition
• textDocument/documentSymbol
• textDocument/hover
• textDocument/publishDiagnostics
• textDocument/references
• textDocument/rename
• textDocument/signatureHelp
• workspace/symbol

Editor Setup

The following instructions show how to use jedi-language-server with your development tooling. The instructions assume you have already installed jedi-language-server.

Neovim

Use coc.nvim with coc-jedi.

Command line (bash / zsh)

At your terminal prompt:

jedi-language-server

jedi-language-server currently works only over IO. This may change in the future.

Configuration

jedi-language-server supports top-level configuration items in coc-settings.json (or your editor-equivalent configuration file). The following is a snippet of coc-settings.json with defaults:

{
  "jedi.enabled": true,
  "jedi.completion.triggerCharacters": [".", "'", "\""],
  "jedi.signatureHelp.triggerCharacters": ["(", ",", ")"],
  "jedi.diagnostics.enabled": true,
  "jedi.diagnostics.didOpen": true,
  "jedi.diagnostics.didChange": true,
  "jedi.diagnostics.didSave": true
}

jedi.enabled

Enables (or disables) all jedi-language-server features (other than initialization)

• type: boolean
• default: true

jedi.completion.triggerCharacters

Defines characters that trigger completion automatically when typed

• type: array<string>
• default: [".", "'", "\""]

jedi.signatureHelp.triggerCharacters

Defines characters that trigger signature help automatically when typed

• type: array<string>
• default: ["(", ",", ")"]

jedi.diagnostics.enabled

Enables (or disables) diagnostics provided by Jedi

• type: boolean
• default: true

jedi.diagnostics.didOpen

When diagnostics are enabled, run on document open

• type: boolean
• default: true

jedi.diagnostics.didChange

When diagnostics are enabled, run on in-memory document change (eg, while you're editing, without needing to save to disk)

• type: boolean
• default: true

jedi.diagnostics.didSave

When diagnostics are enabled, run on document save (to disk)

• type: boolean
• default: true

Additional Diagnostics

jedi-langugage-server provides diagnostics about syntax errors, powered by Jedi. If you would like additional diagnostics, we suggest using the powerful diagnostic-language-server.

If using Neovim/coc, this can easily be done with coc-diagnostic. Configure with pylint in your coc-settings.json:

"diagnostic-languageserver.filetypes": {
  "python": "pylint"
},
"diagnostic-languageserver.linters": {
  "pylint": {
    "sourceName": "pylint",
    "command": "pylint",
    "args": [
      "--output-format",
      "text",
      "--score",
      "no",
      "--msg-template",
      "'{line}:{column}:{category}:{msg} ({msg_id}:{symbol})'",
      "%file"
    ],
    "formatPattern": [
      "^(\\d+?):(\\d+?):([a-z]+?):(.*)$",
      {
        "line": 1,
        "column": 2,
        "security": 3,
        "message": 4
      }
    ],
    "securities": {
      "informational": "hint",
      "refactor": "info",
      "convention": "info",
      "warning": "warning",
      "error": "error",
      "fatal": "error"
    },
    "offsetColumn": 1,
    "formatLines": 1
  }
}

Local Development

To build and run this project from source:

Dependencies

Install the following tools manually:

• Poetry
• GNU Make

Recommended

• asdf

Get source code

Fork this repository and clone the fork to your development machine:

git clone https://github.com/<YOUR-USERNAME>/jedi-language-server
cd jedi-language-server

Set up development environment

make setup

Run tests

make test

Inspiration

Palantir's python-language-server inspired this project. Unlike python-language-server, jedi-language-server:

• Uses pygls instead of creating its own low-level Language Server Protocol bindings
• Supports one powerful 3rd party library: Jedi. By only supporting Jedi, we can focus on supporting all Jedi features without exposing ourselves to too many broken 3rd party dependencies (I'm looking at you, rope).
• Is supremely simple because of its scope constraints. Leave complexity to the Jedi master. If the force is strong with you, please submit a PR!

Written by

Samuel Roeca [e-mail]