Disable indent-tabs-mode in emacs-lisp-mode via .dir-locals.el

[d125q]

I noticed that the Emacs Lisp code in leaf.el does not use the standard Emacs configuration which allows for tabs to be used for indentation.

Therefore, I propose that a .dir-locals.el is added that sets indent-tabs-mode to nil in emacs-lisp-mode.

[conao3]

Good catch. As I configure indent-tabs-mode to nil globally, I haven't met this error.
But that file helps many developers to contribute leaf.

https://github.com/conao3/dotfiles/blob/d17c030115b5739e7593d95eecc950ed8d3ec427/.dotfiles/.emacs.d/init.el#L254-L281

(leaf cus-start
    :doc "define customization properties of builtins"
    :url "http://handlename.hatenablog.jp/entry/2011/12/11/214923" ; align sumple
    :bind (("M-ESC ESC" . keyboard-quit))
    ;; :hook ((before-save-hook . delete-trailing-whitespace))
    :custom `((gc-cons-threshold               . ,(* 512 1024 1024))
              (garbage-collection-messages     . t)
              (fill-column                     . 70)
              (tab-width                       . 8)
              ;; (shell-file-name              . "/bin/bash")
              (user-full-name                  . "Naoya Yamashita")
              (user-mail-address               . "conao3@gmail.com")
              (user-login-name                 . "conao3")
              (debug-on-error                  . t)
              (create-lockfiles                . nil)
              (use-dialog-box                  . nil)
              (use-file-dialog                 . nil)
              (frame-resize-pixelwise          . t)
              (enable-recursive-minibuffers    . t)
              (history-length                  . 1000)
              (history-delete-duplicates       . t)
              (inhibit-compacting-font-caches  . t)
              (scroll-preserve-screen-position . t)

              (truncate-lines   . t)
              (menu-bar-mode    . t)
              (tool-bar-mode    . nil)
              (indent-tabs-mode . nil))
    :config
    (keyboard-translate ?\C-h ?\C-?)
    (mapc (lambda (func) (put func 'disabled nil))
          (cdr '(:dummy
                 upcase-region downcase-region
                 narrow-to-region narrow-to-page narrow-to-defun
                 list-timers))))

[conao3]

This issue is solved by add file local variables settings.