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### 18.7 Viewing Cross-References

User Option: reftex-view-crossref-extra

  Macros which can be used for the display of cross references. This is used when `reftex-view-crossref` is called with point in an argument of a macro. Note that crossref viewing for citations, references (both ways) and index entries is hard-coded. This variable is only to configure additional structures for which crossreference viewing can be useful. Each entry has the structure

      (macro-re search-re highlight).

  macro-re is matched against the macro. search-re is the regexp used to search for cross references. ‘`%s`’ in this regexp is replaced with the macro argument at point. highlight is an integer indicating which subgroup of the match should be highlighted.

User Option: reftex-auto-view-crossref

  Non-`nil` means, initially turn automatic viewing of crossref info on. Automatic viewing of crossref info normally uses the echo area. Whenever point is idle for more than `reftex-idle-time` seconds on the argument of a `\ref` or `\cite` macro, and no other message is being displayed, the echo area will display information about that cross reference. You can also set the variable to the symbol `window`. In this case a small temporary window is used for the display. This feature can be turned on and off from the menu (Ref->Options).

User Option: reftex-idle-time

  Time (secs) Emacs has to be idle before automatic crossref display or toc recentering is done.

User Option: reftex-cite-view-format

  Citation format used to display citation info in the message area. See the variable `reftex-cite-format` for possible percent escapes.

User Option: reftex-revisit-to-echo

  Non-`nil` means, automatic citation display will revisit files if necessary. When `nil`, citation display in echo area will only be active for cached echo strings (see `reftex-cache-cite-echo`), or for BibTeX database files which are already visited by a live associated buffers.

User Option: reftex-cache-cite-echo

  Non-`nil` means, the information displayed in the echo area for cite macros (see variable `reftex-auto-view-crossref`) is cached and saved along with the parsing information. The cache survives document scans. In order to clear it, use `M-x reftex-reset-mode`.

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