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I am implementing a feature to automatically generate a bookmark name by extracting information from the current context. Many packages provide such info. For example which-func (through (which-function)) and semantic/find (through (semantic-current-tag)).

How do I detect availability/support of which-func or semantic/find for the current buffer?

Is this exposed by the mode writer through modes so from (eq major-mode DESIRED-FEATURE-mode) and DESIRED-FEATURE-minor-mode variable?

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You can check if which-func feature is useful in a major-mode by checking the value of the variable which-func-functions.

From the documentation:

List of functions for which-function to call with no arguments. It calls them sequentially, and if any returns non-nil, which-function uses that name and stops looking for the name.

If the major-mode does not use which-func, the value of this variable will be nil and you will see [???] in the mode-line in bottom-right when you enable the which-function-mode.

If the major-mode makes use of which-func, you will see a list of function names assigned to this variable.

The which-func package is not required by default and is autoloaded when you call the which-function-mode command. After that you will be able to access the which-func-functions variable.

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    For instance, verilog-mode does not have which-func support but I added my own support by writing functions to parse strings for which-func: – Kaushal Modi Apr 20 '15 at 19:04
  • The link in above comment points to a specific commit of my setup-verilog.el. If interested in the latest (with probably lesser bugs), see here. – Kaushal Modi Jul 16 '15 at 14:47

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