# H2P: HTML in, PDF out
H2P takes an HTML blob, uses wkhtmltopdf to convert it to PDF, and returns a PDF
blob.
## Installation
```bash
gem install 'h2p'
# you'll also need to have wkhtmltopdf installed:
gem install 'wkhtmltopdf-binary'
```
Or just [use the source™️](#use-the-source).
## Usage
```ruby
...
my_html = 'Hello, world!
'
my_pdf = H2P.convert(my_html)
...
```
## Use the source
If you don't want to add another dependency to your project, here's the source
of the present gem (with the [modulation](https://github.com/digital-fabric/modulation)
dependency removed.) Feel free to use and manipulate however you please:
```ruby
# This is free and unencumbered software released into the public domain
# Full license here: https://unlicense.org/
require 'tmpdir'
require 'fileutils'
module H2P
def self.tmp_path(ext)
stamp = Time.now.to_f
@counter ||= 0
File.join(Dir.tmpdir, "h2p-#{stamp}-#{@counter += 1}.#{ext}")
end
def self.convert(html)
html_path = tmp_path(:html)
pdf_path = tmp_path(:pdf)
File.open(html_path, 'w+') { |f| f << html }
system('wkhtmltopdf', '-q', html_path, pdf_path)
IO.read(pdf_path)
ensure
FileUtils.rm(html_path) rescue nil
FileUtils.rm(pdf_path) rescue nil
end
end
```