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#### 8.1.3.9 Customizations

`nnir-method-default-engines`

  Alist of pairs of server backends and search engines. The default associations are

      (nnimap . imap)
      (nntp . gmane)

`nnir-ignored-newsgroups`

  A regexp to match newsgroups in the active file that should be skipped when searching all groups on a server.

`nnir-summary-line-format`

  The format specification to be used for lines in an nnir summary buffer. All the items from `gnus-summary-line-format` are available, along with three items unique to nnir summary buffers:

      %Z    Search retrieval score value (integer)
      %G    Article original full group name (string)
      %g    Article original short group name (string)

  If `nil` (the default) this will use `gnus-summary-line-format`.

`nnir-retrieve-headers-override-function`

  If non-`nil`, a function that retrieves article headers rather than using the gnus built-in function. This function takes an article list and group as arguments and populates the `nntp-server-buffer` with the retrieved headers. It should then return either ’nov or ’headers indicating the retrieved header format. Failure to retrieve headers should return `nil`.

  If this variable is `nil`, or if the provided function returns `nil` for a search result, `gnus-retrieve-headers` will be called instead."