Here a git formatted patch .. it's an optimized, generic version of the snippet in my previous email. It's now "/" agnostic.
From 5e000cebb993a8cdccdf5e67f6b0eb66b4a267d8 Mon Sep 17 00:00:00 2001
Date: Mon, 25 Jul 2016 16:08:50 -0400
Subject: [PATCH] Do not include comment start chars in ffap string
* lisp/ffap.el (ffap-string-at-point): If the point is in a comment,
ensure that the returned string does not contain the comment start
characters (especially for major modes that have '//' as comment start
characters).
Otherwise, in a major mode like c-mode, with `ido-mode' enabled and
`ido-use-filename-at-point' set to `guess', doing "C-x C-f" on a "//foo"
comment will initiate an attempt to access a path "//foo" (Bug#24057).
---
lisp/ffap.el | 87 +++++++++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 65 insertions(+), 22 deletions(-)
diff --git a/lisp/ffap.el b/lisp/ffap.el
index 7013e6e..8708a17 100644
--- a/lisp/ffap.el
+++ b/lisp/ffap.el
@@ -1097,33 +1097,76 @@ ffap-string-at-point
(defun ffap-string-at-point (&optional mode)
"Return a string of characters from around point.
+
MODE (defaults to value of `major-mode') is a symbol used to look up
string syntax parameters in `ffap-string-at-point-mode-alist'.
+
If MODE is not found, we use `file' instead of MODE.
-If the region is active, return a string from the region.
-Sets the variable `ffap-string-at-point' and the variable
-`ffap-string-at-point-region'."
+
+If the region is active,return a string from the region.
+
+If the point is in a comment, ensure that the returned string does not contain
+the comment start characters (especially for major modes that have '//' as
+comment start characters).
+
+Sets variables `ffap-string-at-point' and `ffap-string-at-point-region'. "
(let* ((args
- (cdr
- (or (assq (or mode major-mode) ffap-string-at-point-mode-alist)
- (assq 'file ffap-string-at-point-mode-alist))))
- (pt (point))
- (beg (if (use-region-p)
- (region-beginning)
- (save-excursion
- (skip-chars-backward (car args))
- (skip-chars-forward (nth 1 args) pt)
- (point))))
- (end (if (use-region-p)
- (region-end)
- (save-excursion
- (skip-chars-forward (car args))
- (skip-chars-backward (nth 2 args) pt)
- (point)))))
+ (cdr
+ (or (assq (or mode major-mode) ffap-string-at-point-mode-alist)
+ (assq 'file ffap-string-at-point-mode-alist))))
+ (region-selected (use-region-p))
+ (pt (point))
+ (beg (if region-selected
+ (region-beginning)
+ (save-excursion
+ (skip-chars-backward (car args))
+ (skip-chars-forward (nth 1 args) pt)
+ (point))))
+ (end (if region-selected
+ (region-end)
+ (save-excursion
+ (skip-chars-forward (car args))
+ (skip-chars-backward (nth 2 args) pt)
+ (point))))
+ (beg-new beg))
+ ;; (message "ffap-string-at-point dbg: beg = %d end = %d" beg end)
+ ;; If the initial characters of the to-be-returned string are the
+ ;; current major mode's comment starter characters, *and* are not
+ ;; part of a comment, remove those from the returned string
+ ;; (Bug#24057).
+ ;; Example comments in `c-mode' (which considers lines beginning
+ ;; with "//" as comments):
+ ;; //tmp - This is a comment. It does not contain any path reference.
+ ;; ///tmp - This is a comment. The "/tmp" portion in that is a path.
+ ;; ////tmp - This is a comment. The "//tmp" portion in that is a path.
+ (when (and
+ ;; Proceed if no region is selected by the user.
+ (null region-selected)
+ ;; Check if END character is part of a comment.
+ (save-excursion
+ (goto-char end)
+ (nth 4 (syntax-ppss))))
+ (save-excursion
+ ;; Increment BEG till point at BEG is in a comment too.
+ ;; (nth 4 (syntax-ppss)) will be null for comment start
+ ;; characters (for example, for the "//" characters in
+ ;; `c-mode' line comments).
+ (setq beg (catch 'break
+ (while (< beg-new end)
+ (goto-char beg-new)
+ (if (nth 4 (syntax-ppss)) ; in a comment
+ (throw 'break beg-new)
+ (setq beg-new (1+ beg-new))))
+ end)))) ; Set BEG to END if no throw happens
+ ;; (message "ffap-string-at-point dbg: beg = %d beg-new = %d"
+ ;; beg beg-new)
(setq ffap-string-at-point
- (buffer-substring-no-properties
- (setcar ffap-string-at-point-region beg)
- (setcar (cdr ffap-string-at-point-region) end)))))
+ (buffer-substring-no-properties
+ (setcar ffap-string-at-point-region beg)
+ (setcar (cdr ffap-string-at-point-region) end)))
+ ;; (message "ffap-string-at-point dbg: ffap-string-at-point = %S"
+ ;; ffap-string-at-point)
+ ffap-string-at-point))
(defun ffap-string-around ()
;; Sometimes useful to decide how to treat a string.
--
2.9.2