extractor.cr

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Crystal bindings to libextractor, a library for extracting metadata from a variety of file formats. Inspired by the Ruby [ffi-extractor] gem and should be API compatible.

libextractor is a simple library for keyword extraction. libextractor does not support all formats but supports a simple plugging mechanism such that you can quickly add extractors for additional formats, even without recompiling libextractor. libextractor typically ships with a dozen helper-libraries that can be used to obtain keywords from common file-types.

libextractor is a part of the GNU project.

Installation

1. Install libextractor

   • Debian / Ubuntu:

     $ sudo apt-get install libextractor-dev libextractor-plugins-all

   • RedHat / Fedora:

     $ sudo dnf install libextractor-devel libextractor-plugins

   • Brew:

     $ brew install libextractor

2. Add the dependency to your shard.yml:

   dependencies:
     extractor:
       github: postmodern/extractor.cr

3. Run shards install

Requirements

• libextractor >= 0.6.0

Examples

require "extractor"

Extractor.extract(string) do |plugin_name,type,format,mime_type,data|
  p {plugin, type, format, mime_type,data}
end

Extractor.extract_from("path/to/image.jpg") do |plugin_name,type,format,mime_type,data|
  p {plugin, type, format, mime_type,data}
end

Development

1. Install libextractor (See Installation)
2. git clone https://github.com/postmodern/extractor.cr.git
3. cd extractor.cr
4. crystal spec

Contributing

1. Fork it (https://github.com/postmodern/extractor.cr/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• Postmodern - creator and maintainer

Copyright

extractor.cr - Crystal bindings for libextractor

Copyright (c) 2020 - Hal Brodigan (postmodern.mod3 at gmail.com)

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.