# Using doc-view with auto-revert to view LaTeX PDF output in Emacs

October 3, 2009
By

(This article was first published on Blogistic Reflections, and kindly contributed to R-bloggers)

When I am authoring a $LaTeX$ document in Emacs, such as a report or my CV, it is useful for me to compile the $LaTeX$ source file periodically to see what the resulting file PDF looks like. I used to run a separate PDF viewer to look at the output, but I now have a complete Emacs solution.

### The editing environment

When writing a $LaTeX$ document, I usually want the output to be a PDF file. Accordingly, I put the following in my .emacs file.

```(setq TeX-PDF-mode t)
```

I then split my Emacs frame into two buffers vertically, using C-x 3 (see screencast below). After compiling my $LaTeX$ file with C-c C-c, I visit the resulting PDF file in the other Emacs window. The Emacs doc-view package will display the PDF file.

### Including auto-revert functionality

The final piece to the puzzle is to set files visited in doc-view-mode to auto-revert when changed on disk. That way, then I update my $LaTeX$ file and recompile with C-c C-c, the PDF in the other window will automatically update.

This is achieved by placing the following line in my .emacs.

```(add-hook 'doc-view-mode-hook 'auto-revert-mode)
```

### Screencast Example

Here is a screencast of this process in action.

This is a simple setup that I use to author reports, edit them, and see immediate updates to my output file without leaving Emacs.

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