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https://github.com/DogLooksGood/parinfer-mode

Parinfer for Emacs :)
https://github.com/DogLooksGood/parinfer-mode

emacs lisp parinfer

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Parinfer for Emacs :)

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README 

        
#+TITLE: Parinfer Mode

#+AUTHOR: DogLooksGood



[[https://melpa.org/#/parinfer][file:https://melpa.org/packages/parinfer-badge.svg]] [[https://stable.melpa.org/#/parinfer][file:https://stable.melpa.org/packages/parinfer-badge.svg]]



[[file:images/logo.png]]



* Deprecated 



This project is no longer maintained.I have no success for a fast enough implementation in Emacs Lisp. 



Fortunately, there's a [[https://github.com/justinbarclay/parinfer-rust-mode][parinfer-rust-mode]]!



* Demo

[[file:images/demo.gif]]



* Table of contents

- [[#what-is-parinfer][What Is Parinfer]]

- [[#installation][Installation]]

- [[#indent-and-paren-modes][Indent And Paren Modes]]

- [[#configurations][Configurations]]

- [[#credits][Credits]]

- [[#license][License]]

- [[#contribution][Contribution]]



* What Is Parinfer

*Parinfer* is a proof-of-concept editor mode for Lisp programming languages.

It will infer some changes to keep Parens and Indentation inline with one another.

Parinfer consists of two modes:



- Indent Mode :: Indent Mode gives you full control of indentation, while Parinfer corrects parens.

- Paren Mode :: Paren Mode gives you full control of parens, while Parinfer corrects indentation.



To learn more about Parinfer, please take a look at its [[https://shaunlebron.github.io/parinfer/][home page]].



And the *parinfer-mode* is the implementation on Emacs with [[https://github.com/oakmac/parinfer-elisp][parinfer-elisp]].



* Installation

Parinfer is available on MELPA(and MELPA Stable) now, I recommend to install with [[https://github.com/jwiegley/use-package][use-package]].



Add following code to your ~.emacs~ or ~init.el~.



#+BEGIN_SRC elisp

  (use-package parinfer

    :ensure t

    :bind

    (("C-," . parinfer-toggle-mode))

    :init

    (progn

      (setq parinfer-extensions

            '(defaults       ; should be included.

              pretty-parens  ; different paren styles for different modes.

              evil           ; If you use Evil.

              lispy          ; If you use Lispy. With this extension, you should install Lispy and do not enable lispy-mode directly.

              paredit        ; Introduce some paredit commands.

              smart-tab      ; C-b & C-f jump positions and smart shift with tab & S-tab.

              smart-yank))   ; Yank behavior depend on mode.

      (add-hook 'clojure-mode-hook #'parinfer-mode)

      (add-hook 'emacs-lisp-mode-hook #'parinfer-mode)

      (add-hook 'common-lisp-mode-hook #'parinfer-mode)

      (add-hook 'scheme-mode-hook #'parinfer-mode)

      (add-hook 'lisp-mode-hook #'parinfer-mode)))

#+END_SRC



* Indent And Paren Modes

Toggle *Indent Mode* and *Paren Mode* with command ~parinfer-toggle-mode~.



** Avoid unexpect buffer changes.

Whenever you switch to *Indent Mode*, parinfer-mode will correct all parens of current buffer.



After opening a file, the parinfer-mode enable *Indent Mode* if it won't make any changes.

Otherwise, *Paren Mode* will be enabled, you can switch to *Indent Mode* manually later.



Alternatively, you can use ~parinfer-diff~ command to see how will *Indent Mode* modify the buffer with ~Ediff~.



[[file:images/diff_demo.gif]]



And there are some keybindings in Ediff:

| Key  | Description                                               |

|------+-----------------------------------------------------------|

| ~q~  | Quit diff.                                                |

| ~b~  | B->A in Ediff, this can apply change to your origin code. |

| ~ra~ | Restore A in Ediff, this can revert change.               |

| ~n~  | Move to next difference.                                  |

| ~p~  | Move to previous difference.                              |



Also, There's a command ~parinfer-auto-fix~ to fix wrong indentation for whole buffer. (Only works with balanced parens)



* Configurations

** parinfer-auto-switch-indent-mode

#+BEGIN_SRC emacs-lisp

  (setq parinfer-auto-switch-indent-mode nil)  ;; default

#+END_SRC



~t~ for enable, Parinfer will auto switch to *Indent Mode* whenever parens are balance in *Paren Mode*.



** parinfer-auto-switch-indent-mode-when-closing

#+BEGIN_SRC emacs-lisp

  (setq parinfer-auto-switch-indent-mode-when-closing nil)  ;; default

#+END_SRC



~t~ for enable, Parinfer will auto switch to *Indent Mode* when the inserted close parens (~)~, ~]~, ~}~) balance the parens of current sexp.

** parinfer-delay-invoke-threshold

#+BEGIN_SRC emacs-lisp

  (setq parinfer-delay-invoke-threshold 6000)  ;; default

#+END_SRC



When the length of text for processing is longer than this, Parinfer will process text after a idle delay instead of process immediately.



** parinfer-delay-invoke-idle

#+BEGIN_SRC emacs-lisp

  (setq parinfer-delay-invoke-idle 0.3)  ;; default

#+END_SRC



The idle seconds before Parinfer processing text on large sexp.



** parinfer-extensions

#+BEGIN_SRC emacs-lisp

  (setq parinfer-extensions '(defaults pretty-parens smart-yank))

#+END_SRC



The extensions that will be enabled. The list could contain followings:



| Extension     | Function                                                                              |

|---------------+---------------------------------------------------------------------------------------|

| defaults      | Should be enabled, basic compatibility                                                |

| pretty-parens | Use dim style for *Indent Mode*, rainbow delimiters for *Paren Mode*                  |

| smart-yank    | Yank will preserve indentation in *Indent Mode*, will preserve parens in *Paren Mode* |

| smart-tab     | ~C-f~ & ~C-b~ on empty line will goto next/previous import indentation.               |

| paredit       | Introduce some paredit commands from paredit-mode.                                    |

| lispy         | Integration with Lispy.                                                               |

| evil          | Integration with Evil.                                                                |

| one           | Experimental on fuzz *Indent Mode* and *Paren Mode*. Not recommanded.                 |



** parinfer-lighters

#+BEGIN_SRC emacs-lisp

  (setq parinfer-lighters '(" Parinfer:Indent" . "Parinfer:Paren"))

#+END_SRC



* Troubleshooting

If Parinfer seems to be indenting incorrectly, ensure ~indent-tabs-mode~ is set to ~nil~ via ~(setq-default indent-tabs-mode nil)~. While Parinfer's theoretical model is able to correctly handle indentation with tabs, ~parinfer-mode~ can currently only handle indentation using spaces.



* Credits

- [[https://github.com/shaunlebron][shaunlebron]] :: Create [[https://shaunlebron.github.io/parinfer/][Parinfer]].

- [[https://github.com/oakmac][oakmac]] :: Bring Parinfer to Emacs with [[https://github.com/oakmac/parinfer-elisp][parinfer-elisp]].

- [[https://github.com/tumashu][tumashu]] :: Help me a lot in writing this plugin.

- [[https://github.com/purcell][purcell]] & [[https://github.com/syohex][syohex]] :: Advice and Tips for writing emacs plugin



* Contribution

Please open an issue if there's any bug or suggestion, and PR is welcomed!



* License

parinferlib.el from [[https://github.com/oakmac/parinfer-elisp][parinfer-elisp]], is licensed under the [[https://github.com/oakmac/parinfer-elisp/blob/master/LICENSE.md][ISC]].



Rest part licensed under the GPLv3.