Exclude certain directories from all operations
The user option denote-excluded-directories-regexp instructs all Denote functions that read or check file/directory names to omit directories that match the given regular expression. The regexp needs to match only the name of the directory, not its full path.
Affected operations include file prompts and functions that return the available files in the value of the user option denote-directory (Maintain separate directory silos for notes).
File prompts are used by several commands, such as denote-link and denote-subdirectory.
Functions that check for files include denote-directory-files and denote-directory-subdirectories.
The match is performed with string-match-p.