8.1.3.7 The notmuch Engine .......................... ‘nnir-notmuch-program’ The name of the notmuch search executable. Defaults to ‘notmuch’. ‘nnir-notmuch-additional-switches’ A list of strings, to be given as additional arguments to notmuch. ‘nnir-notmuch-remove-prefix’ The prefix to remove from each file name returned by notmuch in order to get a group name (albeit with ‘/’ instead of ‘.’). This is a regular expression.