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ChromicPDF is a HTML-to-PDF renderer for Elixir, based on headless Chrome.

## Features

* **Node-free**: In contrast to [many other]( packages, it does not use [puppeteer](, and hence does not require Node.js. It communicates directly with Chrome's [DevTools API]( over pipes, offering the same performance as puppeteer, if not better.
* **Header/Footer**: Using the DevTools API allows to apply the full set of options of the [`printToPDF`]( function. Most notably, it supports header and footer HTML templates.
* **PDF/A**: It can convert printed files to PDF/A using Ghostscript, inspired by the `pdf2archive` script originally created by [@matteosecli]( and later enhanced by [@JaimeChavarriaga]( Created PDF/A-2b and PDF/A-3b files pass the [verapdf]( compliance checks.

## Requirements

* Chromium or Chrome
* Ghostscript (optional, for PDF/A support)

## Installation

ChromicPDF is a supervision tree (rather than an application). You will need to inject it into the supervision tree of your application. First, add ChromicPDF to your runtime dependencies:

def deps do
    {:chromic_pdf, "~> 0.7.1"}

Next, start ChromicPDF as part of your application:

# lib/my_app/application.ex
def MyApp.Application do
  def start(_type, _args) do
    children = [
      # other apps...

    Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)

## Usage

### Main API

Here's how you generate a PDF from an external URL and store it in the local filesystem.

# Prints a local HTML file to PDF.
ChromicPDF.print_to_pdf({:url, ""}, output: "example.pdf")

The next example shows how to print a local HTML file to PDF/A, as well as the use of a callback
function that receives the generated PDF as path to a temporary file.

ChromicPDF.print_to_pdfa({:url, "file:///example.html"}, output: fn pdf ->
  # Send pdf via mail, upload to S3, ...

### Template API

[ChromicPDF.Template]( contains
additional functionality that makes styling of PDF documents easier and overall provides a more
convenient API. See the documentation for details.

[content: "<p>Hello Template</p>"]
|> ChromicPDF.Template.source_and_options()
|> ChromicPDF.print_to_pdf()

### Examples

* For a more complete example of how to integrate ChromicPDF in a Phoenix application, see [examples/phoenix].

## Development

For running the full suite of integration tests, please install and have in your `$PATH`:

* [`verapdf`](
* For `pdfinfo` and `pdftotext`, you need `poppler-utils` (most Linux distributions) or [Xpdf]( (OSX)
* For the odd ZUGFeRD test in [`zugferd_test.exs`](test/integration/zugferd_test.exs), you need to download [ZUV]( and set the `$ZUV_JAR` environment variable.