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cmd/guru: emacs: interpret byte offsets correctly 

Change-Id: Id506c6c0b3f3c585781bfc38df1b665d507a7c33
Reviewed-on: https://go-review.googlesource.com/22019
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Dominik Honnef 2016-04-15 23:03:12 +02:00 committed by Alan Donovan
parent 837ce23ea3
commit 3114265539
1 changed files with 12 additions and 8 deletions
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20
cmd/guru/go-guru.el
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@ -262,10 +262,14 @@ If BUFFER, return the number of characters in that buffer instead."
(string-bytes (buffer-substring (point-min)
(point-max)))))
;; FIXME(dominikh): go-guru--goto-pos-no-file and go-guru--goto-pos
;; assume that Guru is giving rune offsets in the columns field.
;; However, it is giving us byte offsets, causing us to highlight
;; wrong ranges as soon as there's any multi-byte runes in the line.
(defun go-guru--goto-byte (offset)
"Go to the OFFSETth byte in the buffer."
(goto-char (byte-to-position offset)))
(defun go-guru--goto-byte-column (offset)
"Go to the OFFSETth byte in the current line."
(goto-char (byte-to-position (+ (position-bytes (point-at-bol)) (1- offset)))))
(defun go-guru--goto-pos (posn)
"Find the file containing the position POSN (of the form `file:line:col')
set the point to it, switching the current buffer."
@ -273,7 +277,7 @@ set the point to it, switching the current buffer."
(find-file (car file-line-pos))
(goto-char (point-min))
(forward-line (1- (string-to-number (cadr file-line-pos))))
(forward-char (1- (string-to-number (caddr file-line-pos))))))
(go-guru--goto-byte-column (string-to-number (caddr file-line-pos)))))
(defun go-guru--goto-pos-no-file (posn)
"Given `file:line:col', go to the line and column. The file
@ -281,7 +285,7 @@ component will be ignored."
(let ((file-line-pos (split-string posn ":")))
(goto-char (point-min))
(forward-line (1- (string-to-number (cadr file-line-pos))))
(forward-char (1- (string-to-number (caddr file-line-pos))))))
(go-guru--goto-byte-column (string-to-number (caddr file-line-pos)))))
;;;###autoload
(defun go-guru-callees ()
@ -477,8 +481,8 @@ end point."
(go-guru--enclosing-unique)))
(block (if (> (length enclosing) 0) (elt enclosing 0))))
(when block
(goto-char (1+ (cdr (assoc 'start block))))
(set-mark (1+ (cdr (assoc 'end block))))
(go-guru--goto-byte (1+ (cdr (assoc 'start block))))
(set-mark (byte-to-position (1+ (cdr (assoc 'end block)))))
(setq go-guru--last-enclosing (subseq enclosing 1))
(message "Region: %s" (cdr (assoc 'desc block)))
(setq deactivate-mark nil))))