efm-langserver

General purpose Language Server that can use specified error message format generated from specified command. This is useful for editing code with linter.

Usage

Usage of efm-langserver:
  -c string
        path to config.yaml
  -d    dump configuration
  -logfile string
        logfile
  -loglevel int
        loglevel (default 1)
  -q    Run quieter
  -v    Print the version

Configuration

Configuration can be done with either a config.yaml file, or through a DidChangeConfiguration notification from the client. DidChangeConfiguration can be called any time and will overwrite only provided properties.

DidChangeConfiguration only supports V2 configuration and cannot set LogFile.

InitializeParams

Because the configuration can be updated on the fly, capabilities might change throughout the lifetime of the server. To enable support for capabilities that will be available later, set them in the InitializeParams

Example

{
    "initializationOptions": {
        "documentFormatting": true,
        "hover": true,
        "documentSymbol": true,
        "codeAction": true,
        "completion": true
    }
}

Example for config.yaml

Location of config.yaml is:

UNIX: $XDG_CONFIG_HOME/efm-langserver/config.yaml or $HOME/.config/efm-langserver/config.yaml
Windows: %APPDATA%\efm-langserver\config.yaml

Below is example for config.yaml for Windows.

version: 2
root-markers:
  - .git/
lint-debounce: 1s
commands:
  - command: notepad
    arguments:
      - ${INPUT}
    title: メモ帳

tools:
  any-excitetranslate: &any-excitetranslate
    hover-command: 'excitetranslate'
    hover-stdin: true

  blade-blade-formatter: &blade-blade-formatter
    format-command: 'blade-formatter --stdin'
    format-stdin: true

  css-prettier: &css-prettier
    format-command: './node_modules/.bin/prettier ${--tab-width:tabWidth} ${--single-quote:singleQuote} --parser css'

  csv-csvlint: &csv-csvlint
    lint-command: 'csvlint'

  dockerfile-hadolint: &dockerfile-hadolint
    lint-command: 'hadolint'
    lint-formats:
      - '%f:%l %m'

  eruby-erb: &eruby-erb
    lint-debounce: 2s
    lint-command: 'erb -x -T - | ruby -c'
    lint-stdin: true
    lint-offset: 1
    format-stdin: true
    format-command: htmlbeautifier

  html-prettier: &html-prettier
    format-command: './node_modules/.bin/prettier ${--tab-width:tabWidth} ${--single-quote:singleQuote} --parser html'

  javascript-eslint: &javascript-eslint
    lint-command: 'eslint -f visualstudio --stdin --stdin-filename ${INPUT}'
    lint-ignore-exit-code: true
    lint-stdin: true
    lint-formats:
      - "%f(%l,%c): %tarning %m"
      - "%f(%l,%c): %rror %m"

  json-fixjson: &json-fixjson
    format-command: 'fixjson'

  json-jq: &json-jq
    lint-command: 'jq .'

  json-prettier: &json-prettier
    format-command: './node_modules/.bin/prettier ${--tab-width:tabWidth} --parser json'

  lua-lua-format: &lua-lua-format
    format-command: 'lua-format -i'
    format-stdin: true

  make-checkmake: &make-checkmake
    lint-command: 'checkmake'
    lint-stdin: true

  markdown-markdownlint: &markdown-markdownlint
    lint-command: 'markdownlint -s -c %USERPROFILE%\.markdownlintrc'
    lint-stdin: true
    lint-formats:
      - '%f:%l %m'
      - '%f:%l:%c %m'
      - '%f: %l: %m'

  markdown-pandoc: &markdown-pandoc
    format-command: 'pandoc -f markdown -t gfm -sp --tab-stop=2'

  mix_credo: &mix_credo
    lint-command: "mix credo suggest --format=flycheck --read-from-stdin ${INPUT}"
    lint-stdin: true
    lint-formats:
      - '%f:%l:%c: %t: %m'
      - '%f:%l: %t: %m'
    root-markers:
      - mix.lock
      - mix.exs

  php-phpstan: &php-phpstan
    lint-command: './vendor/bin/phpstan analyze --error-format raw --no-progress'

  php-psalm: &php-psalm
    lint-command: './vendor/bin/psalm --output-format=emacs --no-progress'
    lint-formats:
      - '%f:%l:%c:%trror - %m'
      - '%f:%l:%c:%tarning - %m'

  python-autopep8: &python-autopep8
    format-command: 'autopep8 -'
    format-stdin: true

  python-black: &python-black
    format-command: 'black --quiet -'
    format-stdin: true

  python-flake8: &python-flake8
    lint-command: 'flake8 --stdin-display-name ${INPUT} -'
    lint-stdin: true
    lint-formats:
      - '%f:%l:%c: %m'

  python-isort: &python-isort
    format-command: 'isort --quiet -'
    format-stdin: true

  python-mypy: &python-mypy
    lint-command: 'mypy --show-column-numbers'
    lint-formats:
      - '%f:%l:%c: %trror: %m'
      - '%f:%l:%c: %tarning: %m'
      - '%f:%l:%c: %tote: %m'

  python-pylint: &python-pylint
    lint-command: 'pylint --output-format text --score no --msg-template {path}:{line}:{column}:{C}:{msg} ${INPUT}'
    lint-stdin: false
    lint-formats:
      - '%f:%l:%c:%t:%m'
    lint-offset-columns: 1
    lint-category-map:
      I: H
      R: I
      C: I
      W: W
      E: E
      F: E

  python-yapf: &python-yapf
    format-command: 'yapf --quiet'
    format-stdin: true

  rst-lint: &rst-lint
    lint-command: 'rst-lint'
    lint-formats:
      - '%tNFO %f:%l %m'
      - '%tARNING %f:%l %m'
      - '%tRROR %f:%l %m'
      - '%tEVERE %f:%l %m'

  rst-pandoc: &rst-pandoc
    format-command: 'pandoc -f rst -t rst -s --columns=79'

  sh-shellcheck: &sh-shellcheck
    lint-command: 'shellcheck -f gcc -x'
    lint-source: 'shellcheck'
    lint-formats:
      - '%f:%l:%c: %trror: %m'
      - '%f:%l:%c: %tarning: %m'
      - '%f:%l:%c: %tote: %m'

  sh-shfmt: &sh-shfmt
    format-command: 'shfmt -ci -s -bn'
    format-stdin: true

  vim-vint: &vim-vint
    lint-command: 'vint -'
    lint-stdin: true
    lint-formats:
      - '%f:%l:%c: %m'

  yaml-yamllint: &yaml-yamllint
    lint-command: 'yamllint -f parsable -'
    lint-stdin: true

languages:
  blade:
    - <<: *blade-blade-formatter

  css:
    - <<: *css-prettier

  csv:
    - <<: *csv-csvlint

  dockerfile:
    - <<: *dockerfile-hadolint

  elixir:
    - <<: *mix_credo

  eruby:
    - <<: *eruby-erb

  html:
    - <<: *html-prettier

  javascript:
    - <<: *javascript-eslint

  json:
    - <<: *json-fixjson
    - <<: *json-jq
    # - <<: *json-prettier

  lua:
    - <<: *lua-lua-format

  make:
    - <<: *make-checkmake

  markdown:
    - <<: *markdown-markdownlint
    - <<: *markdown-pandoc

  php:
    - <<: *php-phpstan
    - <<: *php-psalm

  python:
    - <<: *python-black
    - <<: *python-flake8
    - <<: *python-isort
    - <<: *python-mypy
    # - <<: *python-autopep8
    # - <<: *python-yapf

  rst:
    - <<: *rst-lint
    - <<: *rst-pandoc

  sh:
    - <<: *sh-shellcheck
    - <<: *sh-shfmt

  vim:
    - <<: *vim-vint

  yaml:
    - <<: *yaml-yamllint

  =:
    - <<: *any-excitetranslate

If you want to debug output of commands:

version: 2
log-file: /path/to/output.log
log-level: 1

Example for DidChangeConfiguration notification

{
    "settings": {
        "rootMarkers": [".git/"],
        "languages": {
            "lua": {
                "formatCommand": "lua-format -i",
                "formatStdin": true
            }
        }
    }
}

Configuration for vim-lsp

augroup LspEFM
  au!
  autocmd User lsp_setup call lsp#register_server({
      \ 'name': 'efm-langserver',
      \ 'cmd': {server_info->['efm-langserver', '-c=/path/to/your/config.yaml']},
      \ 'allowlist': ['vim', 'eruby', 'markdown', 'yaml'],
      \ })
augroup END

vim-lsp-settings provide installer for efm-langserver.

Configuration for coc.nvim

coc-settings.json

  // languageserver
  "languageserver": {
    "efm": {
      "command": "efm-langserver",
      "args": [],
      // custom config path
      // "args": ["-c", "/path/to/your/config.yaml"],
      "filetypes": ["vim", "eruby", "markdown", "yaml"]
    }
  },

Configuration for elgot

Add to eglot-server-programs with major mode you want.

(with-eval-after-load 'eglot
  (add-to-list 'eglot-server-programs
    `(markdown-mode . ("efm-langserver"))))

Configuration for neovim builtin LSP with nvim-lspconfig

init.vim

lua << EOF
require "lspconfig".efm.setup {
    init_options = {documentFormatting = true},
    settings = {
        rootMarkers = {".git/"},
        languages = {
            lua = {
                {formatCommand = "lua-format -i", formatStdin = true}
            }
        }
    }
}
EOF

be sure to declare languages as a table:

lua = {
    {formatCommand = "lua-format -i", formatStdin = true}
}
-- NOT
lua = {
    formatCommand = "lua-format -i", formatStdin = true
}

-- and for multiple formatters, add to the table
lua = {
    {formatCommand = "lua-format -i", formatStdin = true},
    {formatCommand = "lua-pretty -i"}
}

install supported formatters

efm does not include formatters for any languages, you must install these manually, e.g.

lua: LuaFormatter
python: yapf isort
etc...

Supported Lint tools

vint for Vim script
markdownlint-cli for Markdown

Installation

go install github.com/mattn/efm-langserver@latest

Homebrew

brew install efm-langserver

License

MIT

Author

Yasuhiro Matsumoto (a.k.a. mattn)

mattn/efm-langserver

mattn

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