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# 1. Introduction

RefTeX is a specialized package for support of labels, references, citations, and the index in LaTeX. RefTeX wraps itself round 4 LaTeX macros: \label, \ref, \cite, and \index. Using these macros usually requires looking up different parts of the document and searching through BibTeX database files. RefTeX automates these time--consuming tasks almost entirely. It also provides functions to display the structure of a document and to move around in this structure quickly.

See section 6.10 Imprint, for information about who to contact for help, bug reports or suggestions.

 1.1 Installation How to install and activate RefTeX. 1.4 RefTeX in a Nutshell A brief summary and quick guide.

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## 1.1 Installation

RefTeX is bundled and pre--installed with Emacs since version 20.2. It was also bundled and pre--installed with XEmacs 19.16--20.x. XEmacs 21.x users want to install the corresponding plug-in package which is available from the XEmacs ftp site.. See the XEmacs 21.x documentation on package installation for details.

Users of earlier Emacs distributions (including Emacs 19) can get a copy of the RefTeX distribution from the maintainers web-page. See section 6.10 Imprint, for more information.

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## 1.2 Environment

RefTeX needs to access all files which are part of a multifile document, and the BibTeX database files requested by the \bibliography command. To find these files, RefTeX will require a search path, i.e. a list of directories to check. Normally this list is stored in the environment variables TEXINPUTS and BIBINPUTS which are also used by RefTeX. However, on some systems these variables do not contain the full search path. If RefTeX does not work for you because it cannot find some files, read 6.6 Finding Files.

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## 1.3 Entering RefTeX Mode

To turn RefTeX Mode on and off in a particular buffer, use M-x reftex-mode. To turn on RefTeX Mode for all LaTeX files, add the following lines to your .emacs' file:

 (add-hook 'LaTeX-mode-hook 'turn-on-reftex) ; with AUCTeX LaTeX mode (add-hook 'latex-mode-hook 'turn-on-reftex) ; with Emacs latex mode 

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## 1.4 RefTeX in a Nutshell

Typing C-c = (reftex-toc) will show a table of contents of the document. This buffer can display sections, labels and index entries defined in the document. From the buffer, you can jump quickly to every part of your document. Press ? to get help.

2. Labels and References
RefTeX helps to create unique labels and to find the correct key for references quickly. It distinguishes labels for different environments, knows about all standard environments (and many others), and can be configured to recognize any additional labeled environments you have defined yourself (variable reftex-label-alist).

• Creating Labels
Type C-c ( (reftex-label) to insert a label at point. RefTeX will either
• derive a label from context (default for section labels)
• prompt for a label string (default for figures and tables) or
• insert a simple label made of a prefix and a number (all other environments)
Which labels are created how is configurable with the variable reftex-insert-label-flags.

• Referencing Labels
To make a reference, type C-c ) (reftex-reference). This shows an outline of the document with all labels of a certain type (figure, equation,...) and some label context. Selecting a label inserts a \ref{label} macro into the original buffer.

3. Citations
Typing C-c [ (reftex-citation) will let you specify a regular expression to search in current BibTeX database files (as specified in the \bibliography command) and pull out a list of matches for you to choose from. The list is formatted and sorted. The selected article is referenced as \cite{key}' (see the variable reftex-cite-format if you want to insert different macros).

4. Index Support
RefTeX helps to enter index entries. It also compiles all entries into an alphabetically sorted *Index*' buffer which you can use to check and edit the entries. RefTeX knows about the standard index macros and can be configured to recognize any additional macros you have defined (reftex-index-macros). Multiple indices are supported.

• Creating Index Entries
To index the current selection or the word at point, type C-c / (reftex-index-selection-or-word). The default macro reftex-index-default-macro will be used. For a more complex entry type C-c < (reftex-index), select any of the index macros and enter the arguments with completion.

• The Index Phrases File (Delayed Indexing)
Type C-c \ (reftex-index-phrase-selection-or-word) to add the current word or selection to a special index phrase file. RefTeX can later search the document for occurrences of these phrases and let you interactively index the matches.

• Displaying and Editing the Index
To display the compiled index in a special buffer, type C-c > (reftex-display-index). From that buffer you can check and edit all entries.

5. Viewing Cross-References
When point is on the key argument of a cross--referencing macro (\label, \ref, \cite, \bibitem, \index, and variations) or inside a BibTeX database entry, you can press C-c & (reftex-view-crossref) to display corresponding locations in the document and associated BibTeX database files.
When the enclosing macro is \cite or \ref and no other message occupies the echo area, information about the citation or label will automatically be displayed in the echo area.

6. Multifile Documents
Multifile Documents are fully supported. The included files must have a file variable TeX-master or tex-main-file pointing to the master file. RefTeX provides cross-referencing information from all parts of the document, and across document borders (xr.sty').

7. Document Parsing
RefTeX needs to parse the document in order to find labels and other information. It does it automatically once and updates its list internally when reftex-label and reftex-index are used. To enforce reparsing, call any of the commands described above with a raw C-u prefix, or press the r key in the label selection buffer, the table of contents buffer, or the index buffer.

8. AUCTeX
If your major LaTeX mode is AUCTeX, RefTeX can cooperate with it (see variable reftex-plug-into-AUCTeX). AUCTeX contains style files which trigger appropriate settings in RefTeX, so that for many of the popular LaTeX packages no additional customizations will be necessary.

9. Useful Settings
To integrate RefTeX with AUCTeX, use
 (setq reftex-plug-into-AUCTeX t) 

To make your own LaTeX macro definitions known to RefTeX, customize the variables

 reftex-label-alist (for label macros/environments) reftex-section-levels (for sectioning commands) reftex-cite-format (for \cite-like macros) reftex-index-macros (for \index-like macros) reftex-index-default-macro (to set the default macro) 
If you have a large number of macros defined, you may want to write an AUCTeX style file to support them with both AUCTeX and RefTeX.

10. Where Next?
Go ahead and use RefTeX. Use its menus until you have picked up the key bindings. For an overview of what you can do in each of the different special buffers, press ?. Read the manual if you get stuck, of if you are curious what else might be available. The first part of the manual explains in a tutorial way how to use and customize RefTeX. The second part is a command and variable reference.

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