xsv
Yomu
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xsv
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Yomu
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converting text files to plain text.
Yomu sounds like what you're looking for. However, it depends on Apache Tika. It's more or less a wrapper. This is a big lift though, so I don't think you'll find a native Ruby library for something like this.
What are some alternatives?
Roo - Roo provides an interface to spreadsheets of several sorts.
Docsplit - Break Apart Documents into Images, Text, Pages and PDFs
Spreadsheet - The Ruby Spreadsheet by ywesee GmbH
AXLSX - xlsx generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx excels at helping you generate beautiful Office Open XML Spreadsheet documents without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.
Creek - Ruby library for parsing large Excel files.
rubyXL - Ruby lib for reading/writing/modifying .xlsx and .xlsm files
write_xlsx - Rubygem for create excel xlsx file
fast_excel - Ultra Fast Excel Writer for Ruby
docx - a ruby library/gem for interacting with .docx files