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Use replace-buffer-contents to update formatting #45

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Use replace-buffer-contents to update formatting #45

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12 changes: 6 additions & 6 deletions blacken.el
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,11 @@ If `fill', the `fill-column' variable value is used."
:type 'boolean
:safe 'booleanp)

(defcustom blacken-replace-buffer-contents-max-secs nil
"Max number of seconds for replacing buffer contents. See
`replace-buffer-contents' for more information."
:type 'float)

(defun blacken-call-bin (input-buffer output-buffer error-buffer)
"Call process black.

Expand Down Expand Up @@ -137,8 +142,6 @@ Return black process the exit code."
Show black output, if black exit abnormally and DISPLAY is t."
(interactive (list t))
(let* ((original-buffer (current-buffer))
(original-point (point))
(original-window-pos (window-start))
(tmpbuf (get-buffer-create "*blacken*"))
(errbuf (get-buffer-create "*blacken-error*")))
;; This buffer can be left after previous black invocation. It
Expand All @@ -150,10 +153,7 @@ Show black output, if black exit abnormally and DISPLAY is t."
(if (not (zerop (blacken-call-bin original-buffer tmpbuf errbuf)))
(error "Black failed, see %s buffer for details" (buffer-name errbuf))
(unless (eq (compare-buffer-substrings tmpbuf nil nil original-buffer nil nil) 0)
(with-current-buffer tmpbuf
(copy-to-buffer original-buffer (point-min) (point-max)))
(goto-char original-point)
(set-window-start (selected-window) original-window-pos))
(replace-buffer-contents tmpbuf blacken-replace-buffer-contents-max-secs))
(mapc 'kill-buffer (list tmpbuf errbuf)))
(error (message "%s" (error-message-string err))
(when display
Expand Down