Homepage: https://www.gnu.org/software/emacs
Author: Tassilo Horn
Document viewer for Emacs
DocView is a document viewer for Emacs. It converts a number of
document formats (including PDF, PS, DVI, Djvu, ODF, EPUB, CBZ,
FB2, XPS and OXPS files) to a set of PNG (or TIFF for djvu) files,
one image for each page, and displays the images inside an Emacs
buffer. This buffer uses `doc-view-mode' which provides convenient
key bindings for browsing the document.
To use it simply open a document file with
C-x C-f ~/path/to/document RET
and the document will be converted and displayed, if your Emacs supports PNG
images. With `C-c C-c' you can toggle between the rendered images
representation and the source text representation of the document.
Since conversion may take some time all the PNG images are cached in a
subdirectory of `doc-view-cache-directory' and reused when you want to view
that file again. To reconvert a document hit `g' (`doc-view-reconvert-doc')
when displaying the document. To delete all cached files use
`doc-view-clear-cache'. To open the cache with Dired, so that you can tidy
it out use `doc-view-dired-cache'.
When conversion is underway the first page will be displayed as soon as it
is available and the available pages are refreshed every
`doc-view-conversion-refresh-interval' seconds. If that variable is nil the
pages won't be displayed before conversion of the document finished
completely.
DocView lets you select a slice of the displayed pages. This slice
will be remembered and applied to all pages of the current
document. This enables you to cut away the margins of a document
to save some space. To select a slice you can use
`doc-view-set-slice' (bound to `c s') which will query you for the
coordinates of the slice's top-left corner and its width and
height. A much more convenient way to do the same is offered by
the command `doc-view-set-slice-using-mouse' (bound to `c m').
After invocation you only have to press mouse-1 at the top-left
corner and drag it to the bottom-right corner of the desired slice.
Even more accurate and convenient is to use
`doc-view-set-slice-from-bounding-box' (bound to `c b') which uses
the BoundingBox information of the current page to set an optimal
slice. To reset the slice use `doc-view-reset-slice' (bound to `c
r').
You can also search within the document. The command `doc-view-search'
(bound to `C-s') queries for a search regexp and initializes a list of all
matching pages and messages how many match-pages were found. After that you
can jump to the next page containing a match with an additional `C-s'. With
`C-r' you can do the same, but backwards. To search for a new regexp give a
prefix arg to one of the search functions, e.g. by typing `C-u C-s'. The
searching works by using a plain text representation of the document. If
that doesn't already exist the first invocation of `doc-view-search' (or
`doc-view-search-backward') starts the conversion. When that finishes and
you're still viewing the document (i.e. you didn't switch to another buffer)
you're queried for the regexp then.
Dired users can simply hit `v' on a document file. If it's a PS, PDF or DVI
it will be opened using `doc-view-mode'.