# llpp

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- MuPDF

llpp is a lightweight, fast and featureful PDF, EPUB, XPS and CBZ viewer based on MuPDF.

## Installation

Install the llppAUR package, or llpp-gitAUR for the development version.

## Usage

llpp uses keyboard shortcuts and the mouse to navigate through a document. By default, pressing `F1` or `h` will bring up a help page where all other key bindings are described.

Check out the following page for a complete list of the key and mouse bindings.

## Configuration

llpp uses a configuration file to store settings: `$XDG_CONFIG_HOME/llpp.conf` or `~/.config/llpp.conf`. This file stores: 1) application defaults, and 2) file-by-file user preferences (e.g. the last page viewed).

### UI Font

One can set the font used by llpp by indicating the size and filename in the config. For example:

    <llppconfig>
      <ui-font size='16'><![CDATA[/usr/share/fonts/TTF/DejaVuSansMono.ttf]]></ui-font>
      <defaults ... >
      ...
      </defaults>
    </llppconfig>

### Custom key bindings

It is possible to configure key bindings. For example, to disable `Esc` exiting llpp, add the `keymap` element in between the `defaults` tags as follows:

    <llppconfig>
      <defaults ... >
        <keymap mode='view'>
          <map in='esc' out=/>
        </keymap>
      </defaults>
    </llppconfig>

More examples can be found in llpp's example file keys.txt. For vi-like key bindings, see this example.

Tip: Bindings can be set for particular modes, including `birdseye`, `global`, `help`, `info`, `listview`, `outline`, and `view`. Example here.

## Tips and Tricks

### Reload File

A document can be reloaded in three ways:

- Pressing the `r` key
- Sending a HUP signal to the llpp process

    $ killall -SIGHUP llpp

- Using the "remote" interface (see below)

### Remote Interface

The following commands will setup the remote interface and use it to reload the file "image.pdf".

    $ mkfifo /tmp/llpp.remote
    $ llpp -remote /tmp/llpp.remote image.pdf & disown
    $ sleep 1
    $ echo reload >/tmp/llpp.remote

There are eight remote commands:

- `reload` - reload
- `quit` - quit
- `goto <page-number> <x-coordinate> <y-coordinate>` - goto
- `goto1 <page-number> <relative-y-coordinate>` - goto
- `gotor <file-name> <page-number>` - goto other document
- `gotord <file-name> <remote-destination>` - goto named destination within the other document
- `rect <pageno> <color> <x0> <y0> <x1> <y1>` - draw a rectangle
- `activatewin` - raise and switch to llpp's window

### Clean up history

Files that no longer exist can be cleaned from llpp's history by using a "garbage collecting" script, such as the upstream python2 script here. Use the `-gc` flag:

    $ llpp -gc /path/to/script
    gc.py done.

### Inverse search using Synctex and Vim

To use the synctex capability of llpp, add the line bellow to your `~/.config/llpp.conf` under the `defaults` tag:

    <defaults
        ...
        synctex-command='SyncTeX-inverse.sh'
        ...>
        ...
    </defaults>

where `SyncTeX-inverse.sh` is the script bellow

    #!/bin/bash
    pdf_file=$1
    page=$(($2 + 1)) # The page number star at zero in llpp
    x=$3
    y=$4

    synctex edit -o "$page:$x:$y:$pdf_file" \
           -x "gvim --servername synctex --remote-wait-silent +%{line} %{input}"

Make sure `SyncTeX-inverse.sh` is an executable script and add it to your `PATH` environment variable. To use the `synctex` command you will need texlive-bin package from the official Arch repositories.

## See also

- llpp git repo

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