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Fix chunk end adjustment and save for current and older Emacsen.

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This commit is contained in:
Andrey Kotlarski
2013-12-08 21:04:26 +02:00
parent 959bbc7661
commit f4ee23c07f
1 changed files with 46 additions and 32 deletions
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78
vlf.el
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@@ -373,9 +373,8 @@ Return t if move hasn't been canceled."
(inhibit-read-only t))
(cond ((< end edit-end)
(vlf-with-undo-disabled
(delete-region (byte-to-position (1+
(- end
vlf-start-pos)))
(delete-region (byte-to-position
(1+ (- end vlf-start-pos)))
(point-max))))
((< edit-end end)
(let ((edit-end-pos (point-max)))
@@ -432,43 +431,58 @@ Return t if move hasn't been canceled."
(defun vlf-adjust-chunk (start end &optional adjust-start adjust-end
position)
"Adjust chunk at absolute START to END till content can be \
"Adjust chunk at absolute START to END till content can be\
properly decoded. ADJUST-START determines if trying to prepend bytes\
to the beginning, ADJUST-END - append to the end.
Use buffer POSITION as start if given.
Return number of bytes moved back for proper decoding and number of
bytes added to the end."
(let ((position (or position (point-min)))
(shift-start 0)
(shift-end 0)
(chunk-size (- end start)))
;; adjust beginning
(let ((shift-start 0)
(shift-end 0))
(if adjust-start
(while (and (not (zerop start))
(< shift-start 4)
(< 4 (abs (- chunk-size
(length (encode-coding-region
position (point-max)
buffer-file-coding-system
t))))))
(setq shift-start (1+ shift-start)
start (1- start)
chunk-size (1+ chunk-size))
(delete-region position (point-max))
(goto-char position)
(insert-file-contents buffer-file-name nil start end)))
;; adjust end
(when (and adjust-end (< end vlf-file-size))
(let ((expected-size (buffer-size))) ; in case partial symbol is not displayed
(while (and (= expected-size (buffer-size))
(< end vlf-file-size))
(setq shift-end (1+ shift-end)
end (1+ end))
(delete-region position (point-max))
(goto-char position)
(insert-file-contents buffer-file-name nil start end))))
(let ((position (or position (point-min)))
(chunk-size (- end start)))
(while (and (not (zerop start))
(< shift-start 4)
(< 4 (abs (- chunk-size
(length (encode-coding-region
position (point-max)
buffer-file-coding-system
t))))))
(setq shift-start (1+ shift-start)
start (1- start)
chunk-size (1+ chunk-size))
(delete-region position (point-max))
(goto-char position)
(insert-file-contents buffer-file-name nil start end))))
(if adjust-end
(cond ((vlf-partial-decode-shown-p) ;remove raw bytes from end
(goto-char (point-max))
(while (eq (char-charset (preceding-char)) 'eight-bit)
(setq shift-end (1- shift-end))
(delete-char -1)))
((< end vlf-file-size) ;add bytes until new character is displayed
(let ((position (or position (point-min)))
(expected-size (buffer-size)))
(while (and (progn
(setq shift-end (1+ shift-end)
end (1+ end))
(delete-region position (point-max))
(goto-char position)
(insert-file-contents buffer-file-name
nil start end)
(< end vlf-file-size))
(= expected-size (buffer-size))))))))
(cons shift-start shift-end)))
(defun vlf-partial-decode-shown-p ()
"Determine if partial decode codes are displayed.
This seems to be the case with GNU/Emacs before 24.4."
(cond ((< emacs-major-version 24) t)
((< 24 emacs-major-version) nil)
(t ;; TODO: use (< emacs-minor-version 4) after 24.4 release
(string-lessp emacs-version "24.3.5"))))
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