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?
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-functionto call with no arguments. It calls them sequentially, and if any returns non-nil,which-functionuses 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.
verilog-mode does not have which-func support but I added my own support by writing functions to parse strings for which-func:
setup-verilog.el. If interested in the latest (with probably lesser bugs), see here.