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# llpp

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

## Installation

Install the llppAUR package.

## 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 the full help text.

## Configuration

llpp uses a configuration file to store settings: `$XDG_CONFIG_HOME/llpp.conf` or `~/.config/llpp.conf`. This file stores the following:

1. Application defaults.
2. File-by-file user preferences (e.g. the last page viewed).

### Per-document options

Pressing `i` will enter information mode, where you can examine and modify display settings for the current document.

Alternately, pressing `-X` (where `X` is one of the tunable options shown in the help screen) allows you to set a single setting directly.

### UI Font

One can set the font used by llpp by indicating the size and filename in the configuration. 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.

### Save annotations to PDF

You can annotate a PDF file by right clicking while holding `Shift`. To allow saving of annotations, add

    savepath-command='echo %s'

to your `llpp.conf`. After annotating the file, save the changes by pressing `w`. This `echo`s the current PDF file path to the `savepath-command` option.

### Opening links in web browser

By default, llpp will not open links in the default browser. The `uri-launcher` option in `llpp.conf` is responsible for handling this action. To open links in your default web browser, set it to:

    uri-launcher='xdg-open "%s"'

## 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)

### Multiple columns

For side-by-side 2-page viewing, press `-C2` (or set `columns` to `2` in info mode).

If the page offset is wrong (left-hand page showing on the right-hand side), set columns to `2,1,0`.

A unique feature of llpp is being able to split a single page down the middle by setting columns to `-2`. Use `-3` to split a 3-column document.

### 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

### Inverse search using Synctex and Vim/Emacs

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

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

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

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

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

    # for emacs
    # synctex edit -o "$page:$x:$y:$pdf_file" -x "emacsclient +%{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 repository

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