mirror of
https://github.com/m00natic/vlfi.git
synced 2025-01-18 20:10:47 +00:00
Try utf-8 and if not successful, auto detect when adjusting chunk for
proper decoding.
This commit is contained in:
Andrey Kotlarski
parent
d2bd47c2b4
commit
ca13beac24
122
vlfi.el
122
vlfi.el
@ -296,6 +296,7 @@ When given MINIMAL flag, skip non important operations."
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(let ((changed (not (verify-visited-file-modtime
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(current-buffer))))
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(modified (buffer-modified-p))
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(inhibit-read-only t)
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(start (max 0 start))
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(end (min end vlfi-file-size)))
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(if changed
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@ -310,13 +311,14 @@ When given MINIMAL flag, skip non important operations."
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(throw 'abort nil))
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(setq vlfi-start-pos start
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vlfi-end-pos end)
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(let ((inhibit-read-only t)
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(pos (position-bytes (point))))
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(let ((pos (position-bytes (point))))
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(erase-buffer)
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(insert-file-contents-literally
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buffer-file-name nil vlfi-start-pos vlfi-end-pos)
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(goto-char (or (byte-to-position
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(+ pos (vlfi-adjust-chunk)))
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(setq pos (+ pos (vlfi-prepare-chunk)))
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(decode-coding-region (point-min) (point-max)
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buffer-file-coding-system)
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(goto-char (or (byte-to-position pos)
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(point-max))))
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(set-buffer-modified-p nil))
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(if (and modified
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@ -324,19 +326,16 @@ When given MINIMAL flag, skip non important operations."
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(< 3 (- start vlfi-start-pos)))
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(not (y-or-n-p "Buffer modified, are you sure? ")))
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(throw 'abort nil))
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(let ((pos (+ (position-bytes (point))
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(let* ((pos (+ (position-bytes (point))
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vlfi-start-pos))
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(adjust-encoding (or (< vlfi-end-pos end)
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(< start vlfi-start-pos)))
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(adjust-chunk (< start vlfi-start-pos)))
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(adjust-chunk (< start vlfi-start-pos))
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(adjust-encoding (or adjust-chunk
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(< vlfi-end-pos end))))
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(if adjust-encoding
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(let ((inhibit-read-only t))
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(encode-coding-region (point-min) (point-max)
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buffer-file-coding-system)))
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(vlfi-print-offset "require goto:" start end)
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(encode-coding-region (point-min) (point-max)
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buffer-file-coding-system))
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(cond ((< end vlfi-end-pos) ; adjust ends
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(let ((inhibit-read-only t)
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(offset (- end vlfi-start-pos)))
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(let ((offset (- end vlfi-start-pos)))
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(if adjust-encoding
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(progn (delete-region offset (point-max))
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(setq vlfi-end-pos end)))
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@ -347,19 +346,16 @@ When given MINIMAL flag, skip non important operations."
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(1- offset))))))
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((< vlfi-end-pos end)
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(goto-char (point-max))
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(let ((inhibit-read-only t))
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(insert-file-contents-literally
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buffer-file-name nil vlfi-end-pos end))
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(insert-file-contents-literally
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buffer-file-name nil vlfi-end-pos end)
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(setq vlfi-end-pos end)))
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(cond ((< start vlfi-start-pos) ; adjust start
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(goto-char (point-min))
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(let ((inhibit-read-only t))
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(insert-file-contents-literally
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buffer-file-name nil start vlfi-start-pos))
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(insert-file-contents-literally
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buffer-file-name nil start vlfi-start-pos)
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(setq vlfi-start-pos start))
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((< 3 (- start vlfi-start-pos))
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(let ((inhibit-read-only t)
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(offset (- start vlfi-start-pos)))
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(let ((offset (- start vlfi-start-pos)))
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(if adjust-encoding
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(progn (delete-region (point-min) offset)
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(setq vlfi-start-pos start))
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@ -369,12 +365,11 @@ When given MINIMAL flag, skip non important operations."
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(1+ offset))))
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(delete-region (point-min) offset)))
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(setq vlfi-start-pos start)))
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(vlfi-print-offset "actual goto:" vlfi-start-pos vlfi-end-pos)
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(if adjust-chunk (vlfi-adjust-chunk))
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(if adjust-encoding
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(let ((inhibit-read-only t))
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(decode-coding-region (point-min) (point-max)
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buffer-file-coding-system)))
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(when adjust-encoding
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(if adjust-chunk
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(vlfi-prepare-chunk))
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(decode-coding-region (point-min) (point-max)
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buffer-file-coding-system))
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(or modified (set-buffer-modified-p nil))
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(goto-char
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(cond ((< pos vlfi-start-pos) (point-min))
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@ -384,38 +379,49 @@ When given MINIMAL flag, skip non important operations."
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(if changed (set-visited-file-modtime)))
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(or minimal (vlfi-update-buffer-name))))
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(defun vlfi-print-offset (text start end)
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(message "%s: %d %d" text start end))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; encoding
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(defun vlfi-adjust-chunk ()
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"Adjust chunk beginning until content can be properly decoded.
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(defun vlfi-prepare-chunk ()
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"Apply proper decoding and adjust chunk start if needed.
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Return number of bytes moved back for this to happen."
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(with-coding-priority '(utf-8)
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(setq buffer-file-coding-system 'utf-8;; (detect-coding-region (point-min)
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;; (point-max)
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;; t)
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)
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(let ((shift 0)
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(inhibit-read-only t))
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(while (and (not (zerop vlfi-start-pos))
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(< shift 3)
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(/= (- vlfi-end-pos vlfi-start-pos)
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(length (encode-coding-string
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(decode-coding-region
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(point-min) (point-max)
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buffer-file-coding-system t)
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buffer-file-coding-system t))))
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(setq shift (1+ shift)
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vlfi-start-pos (1- vlfi-start-pos))
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(goto-char (point-min))
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(insert-file-contents-literally
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buffer-file-name nil vlfi-start-pos (1+ vlfi-start-pos))
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(setq buffer-file-coding-system 'utf-8
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;; (detect-coding-region (point-min) (point-max) t)
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))
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(decode-coding-region (point-min) (point-max)
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buffer-file-coding-system)
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shift)))
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(let ((status (vlfi-adjust-chunk 'utf-8)))
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(unless (car status) ; no success with utf-8, auto-detect
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(delete-region (point-min) (+ (point-min) (cdr status)))
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(setq vlfi-start-pos (+ vlfi-start-pos (cdr status))
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status (vlfi-adjust-chunk)))
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(cdr status)))
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(defun vlfi-adjust-chunk (&optional encoding)
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"Adjust chunk beginning until content can be properly decoded.
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Try with explicit ENCODING if given, otherwise auto-detect.
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Return cons \(success-status . number-of-bytes-moved-back\)."
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(setq buffer-file-coding-system
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(or encoding
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(detect-coding-region (point-min) (point-max) t)))
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(let ((shift 0)
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(success nil)
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(chunk-size (- vlfi-end-pos vlfi-start-pos)))
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(while (and (< shift 4)
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(not (setq success (vlfi-decode-status chunk-size)))
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(not (zerop vlfi-start-pos)))
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(goto-char (point-min))
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(insert-file-contents-literally ; insert 1 byte
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buffer-file-name nil (1- vlfi-start-pos) vlfi-start-pos)
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(setq shift (1+ shift)
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chunk-size (1+ chunk-size)
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vlfi-start-pos (1- vlfi-start-pos)
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buffer-file-coding-system
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(or encoding
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(detect-coding-region (point-min) (point-max) t))))
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(cons success shift)))
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(defun vlfi-decode-status (size)
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"Check if decoding followed by encoding results in SIZE bytes."
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(= size (length (encode-coding-string
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(decode-coding-region (point-min) (point-max)
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buffer-file-coding-system t)
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buffer-file-coding-system t))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; search
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