3

To configure imenu in my major mode, I need to set imenu-generic-expression to have regexps for functions.

However, this is incorrectly detects things inside comments and strings that look like functions.

How do I prevent this? imenu isn't confused by the following elisp, but I can't see what emacs-lisp-mode is doing differently.

;; imenu detects this.
(defun foo () (foo))

;; imenu correctly ignores this, even though it's at
;; the beginning of the line.
"
(defun bar () (bar))
"

;; imenu correctly ignores this.
;; (defun baz () (baz))

;; imenu correctly detects this, even though it's not
;; at the beginning of the line.
 (defun boz () (boz))
  • Can you simply anchor your expression at the beginning of the line? That's what the default value appears to do. – Trebor Rude Aug 26 '15 at 20:51
  • @TreborRude that doesn't help with multiline comments, and in the elisp example it's not confused by the string even though it's not at the beginning of the line. – Wilfred Hughes Aug 26 '15 at 20:57
2

The interesting function here is imenu--generic-function which by skips comments and string by inspecting the value of syntax-ppss. So it should have worked out of the box for you. Looking at the code it seems to jumps to the start of the before checking for output of syntax-ppss, I guess that is screwing up things for you (since it might move out the comment/string by moving to start of line).

I cannot suggest any workarounds since I am not aware of the major-mode you are taking about.

  • Thanks, that's really helpful, and I'll investigate further. The major mode I'm looking at is rust-mode. – Wilfred Hughes Aug 28 '15 at 17:07
  • @WilfredHughes I am not sure I understand why anchoring the imenu expressions to beginning of line, would break in presence of multiline comments. syntax-ppss would return that the point is in a string/comment and imenu--generic-function would discard the corresponding match wouldn't it? – Iqbal Ansari Aug 30 '15 at 14:31

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