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bug#28412: Acknowledgement (26.0.50; Let save-some-buffers accept write-

From: Eric Abrahamsen
Subject: bug#28412: Acknowledgement (26.0.50; Let save-some-buffers accept write-contents-functions)
Date: Mon, 11 Sep 2017 14:41:08 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

> Thanks.  Can we have some simple tests for this, both with and without
> visiting a file?

Is this sufficient, do you think?

(ert-deftest files-test-no-file-write-contents ()
  "Test that `write-contents-functions' permits saving a file.
Usually `basic-save-buffer' will prompt for a file name if the
current buffer has none.  It should first call the functions in
`write-contents-functions', and if one of them returns non-nil,
consider the buffer saved, without prompting for a file
name (Bug#28412)."
  (let ((read-file-name-function
         (lambda (&rest _ignore)
           (error "Prompting for file name"))))
    ;; With contents function, and no file.
      (setq write-contents-functions
            (list (lambda () t)))
      (set-buffer-modified-p t)
      (should (null (save-buffer))))
    ;; With no contents function and no file.  This should reach the
    ;; `read-file-name' prompt.
      (set-buffer-modified-p t)
      (should-error (save-buffer) :type 'error))
    ;; Then a buffer visiting a file: should save normally.
    (files-tests--with-temp-file temp-file-name
      (with-current-buffer (find-file-noselect temp-file-name)
        (setq write-contents-functions nil)
        (insert "p")
        (should (null (save-buffer)))
        (should (eq (buffer-size) 1))))))

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