paredit-mode inserts extra space in clojure-mode

[dgr]

I'm not sure whether the following is a clojure-mode or paredit-mode bug. Recent updates seem to have introduced this, however, and it doesn't happen when using paredit-mode in other modes (e.g., emacs-lisp-mode).

Expected behavior

If I want to quote a list, I would typically type '( and paredit-mode would insert the closing parenthesis and it would show '() in the buffer.

Actual behavior

In clojure-mode, when I type the opening parenthesis, paredit-mode inserts an extra space between the tick and the opening parenthesis, leaving '<space>() rather than '() in the buffer (where <space> represents the extra space). This does NOT happen when using paredit-mode with emacs-lisp-mode, lisp-mode, or scheme-mode. This suggests that the root cause of the bug is located in clojure-mode.

Steps to reproduce the problem

The following init.el shows a minimal configuration. With this init.el, start emacs and then in the *scratch* buffer, type '( in emacs-lisp mode. Notice that no extra space is entered between the tick and the opening parenthesis.

Next, switch to clojure-mode (e.g., just use M-x clojure-mode in the *scratch* buffer). Type '( again and notice the extra space.

Sample init.el:

(require 'package)
(add-to-list 'package-archives
             '("melpa" . "http://melpa.milkbox.net/packages/")
             t)
(package-initialize)

;;; Bootstrap use-package if it isn't already installed
(unless (package-installed-p 'use-package)
  (unless package-archive-contents
    (package-refresh-contents))
  (package-install 'use-package))

(require 'use-package)

(use-package paredit
  :ensure t
  :hook ((emacs-lisp-mode clojure-mode cider-repl-mode lisp-mode scheme-mode) . paredit-mode))

(use-package clojure-mode
  :ensure t
  :mode (("\\.clj\\'" . clojure-mode)
         ("\\.cljs\\'" . clojurescript-mode)
         ("\\.cljc\\'" . clojurec-mode)
         ("\\.cljx\\'" . clojurex-mode)))

Environment & Version information

clojure-mode version

clojure-mode (version 5.2.0-snapshot)

Emacs version

GNU Emacs 26.3 (build 1, x86_64-apple-darwin18.2.0, NS appkit-1671.20 Version 10.14.3 (Build 18D109))
 of 2019-09-02

installed via brew cask install emacs.

Operating system

MacOS 10.15.4 (Catalina)

[yuhan0]

Looks like more fallout from the syntax table changes in #559 :/

I think the fix for this lies in clojure-space-for-delimiter-p, will look into it a bit more and submit a PR

[dgr]

Thanks, folks.