Using ggtags programmatically

[csantosb]

I try to implement some logic on top of ggtags to manage vhdl sources. To achieve this, I need to act programmatically on buffer switching.

Say for example I am in buffer A. Then I declare

(defun test()
  (interactive)
  (search-backward-regexp "something")
  (previous-line)
  (end-of-line)
  (backward-char 2)
  (ggtags-find-definition (thing-at-point `symbol))
  (insert "test"))

to locate a tag "something" in buffer A, get to its definition in buffer B, and then insert some text in buffer B. However, when doing so I am inserting text in buffer A, even if point is at buffer B.

What am I doing wrong ?

[leoliu]

Hi @csantosb

ggtags is async so when ggtags-find-definition is fired you are still in buffer A. I think a more natural solution might be something along these lines.

1. Set a custom ggtags-bounds-of-tag-function to tell ggtags how to get the tag at point; the default is to use the symbol at point.
2. provide a function to ggtags-find-tag-hook that does the insertion of your text.

HTH,
Leo

[csantosb]

I understand now: using the hook is the right approach. Thanks a lot !