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README.md

langtool.el

Install:

Install LanguageTool version 3.0 or later (and java) https://languagetool.org/

Put this file into load-path'ed directory, and byte compile it if desired. And put the following expression into your ~/.emacs.

(require 'langtool)

Settings (required):

langtool.el have 3 types of client.

  1. Command line

This setting should be set, if you use rest of clients, to get full of completion support. And you should be set the variables before load this library.

(setq langtool-language-tool-jar "/path/to/languagetool-commandline.jar")
(require 'langtool)

Alternatively, you can set the classpath where LanguageTool's jars reside (e.g. ArchLinux):

(setq langtool-java-classpath
      "/usr/share/languagetool:/usr/share/java/languagetool/*")
(require 'langtool)

You can set a script that hold java setting (e.g. Gentoo):

(setq langtool-bin "/path/to/your/langtool")
(require 'langtool)
  1. HTTP server & client

You can use HTTP server implementation. This is very fast after listen server, but has security risk if there are multiple user on a same host.

(setq langtool-language-tool-server-jar "/path/to/languagetool-server.jar")

You can change HTTP server port number like following.

(setq langtool-server-user-arguments '("-p" "8082"))
  1. HTTP client

If you have running HTTP LanguageTool server instance on any machine:

(setq langtool-http-server-host "localhost"
      langtool-http-server-port 8082)

Now testing although, that running instance is working under HTTPSServer or via general ssl support (e.g. nginx) following may be working. Again, this is now testing, so please open issue when the ssl/tls connection is not working.

(setq langtool-http-server-stream-type 'tls)

Optional settings

  • Key binding if you desired.
(global-set-key "\C-x4w" 'langtool-check)
(global-set-key "\C-x4W" 'langtool-check-done)
(global-set-key "\C-x4l" 'langtool-switch-default-language)
(global-set-key "\C-x44" 'langtool-show-message-at-point)
(global-set-key "\C-x4c" 'langtool-correct-buffer)
  • Default language is detected by LanguageTool automatically. Please set langtool-default-language if you need specific language.
(setq langtool-default-language "en-US")

Otherwise, invoke M-x langtool-check with C-u (universal-argument)

  • Currently GNU java version is not working. Please change the variable to your favorite java executable.
(setq langtool-java-bin "/path/to/java")
(setq langtool-bin "/usr/bin/languagetool")
  • Maybe you want to specify your mother tongue.
(setq langtool-mother-tongue "en")
  • To customize LanguageTool commandline arguments.
(setq langtool-java-user-arguments '("-Dfile.encoding=UTF-8"))

You can also make the variable to buffer local like following:

(add-hook '**SOME**-mode-hook
          (lambda () (set (make-local-variable 'langtool-java-user-arguments)
                         '("-Dfile.encoding=UTF-8"))))

NOTE: Although there is no good example, langtool-user-arguments is a similar custom variable.

Usage:

  • To check current buffer and show warnings.
M-x langtool-check

Check with different language. You can complete supported language with C-i/TAB

C-u M-x langtool-check
  • To correct marker follow LanguageTool suggestions.
M-x langtool-correct-buffer
  • Go to warning point you can see a report from LanguageTool. Otherwise:
M-x langtool-show-message-at-point
(defun langtool-autoshow-detail-popup (overlays)
  (when (require 'popup nil t)
    ;; Do not interrupt current popup
    (unless (or popup-instances
                ;; suppress popup after type `C-g` .
                (memq last-command '(keyboard-quit)))
      (let ((msg (langtool-details-error-message overlays)))
        (popup-tip msg)))))
(setq langtool-autoshow-message-function
      'langtool-autoshow-detail-popup)
  • To finish checking. All langtool marker is removed.
M-x langtool-check-done

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