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nix-format: support remote buffers #206

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nix-format: support remote buffers #206

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27 changes: 16 additions & 11 deletions nix-format.el
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Original file line number Diff line number Diff line change
Expand Up @@ -16,23 +16,28 @@
(defun nix--replace-buffer-contents (src dst)
(if (fboundp 'replace-buffer-contents)
(with-current-buffer dst (replace-buffer-contents src))
(unless (string= (with-current-buffer src (buffer-string))
(with-current-buffer dst (buffer-string)))
(unless (string= (with-current-buffer src (buffer-string))
(with-current-buffer dst (buffer-string)))
(with-current-buffer src
(copy-to-buffer dst (point-min) (point-max))))))
(copy-to-buffer dst (point-min) (point-max))))))

(defun nix--format-call (buf nixfmt-bin)
"Format BUF using nixfmt."
(with-current-buffer (get-buffer-create "*nixfmt*")
(erase-buffer)
(insert-buffer-substring buf)
(if (zerop (call-process-region (point-min) (point-max) nixfmt-bin t t nil))
(nix--replace-buffer-contents (current-buffer) buf)
(error "Nixfmt failed, see *nixfmt* buffer for details"))))
"Format BUF using program NIXFMT-BIN."
(let ((temp-file (make-nearby-temp-file "nixfmt")))
(unwind-protect
(let ((out-buf (get-buffer-create "*nixfmt*")))
(with-current-buffer out-buf
(erase-buffer))
(with-current-buffer buf
(write-region (point-min) (point-max) temp-file nil 'no-visit nil nil))
(if (zerop (process-file nixfmt-bin temp-file out-buf))
(nix--replace-buffer-contents out-buf buf)
(error "Nixfmt failed, see *nixfmt* buffer for details")))
(delete-file temp-file))))

(defun nix--find-nixfmt ()
"Find the nixfmt binary, or error if it's missing."
(let ((nixfmt-bin (executable-find nix-nixfmt-bin)))
(let ((nixfmt-bin (executable-find nix-nixfmt-bin t)))
(unless nixfmt-bin
(error "Could not locate executable %S" nix-nixfmt-bin))
nixfmt-bin))
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