Adapt the PDFtk PDF tool's call syntax with Go

Programming Snapshot – PDFtk Go Variant

© Lead Image © Sergey Nivens, 123RF.com

© Lead Image © Sergey Nivens, 123RF.com

Article from Issue 237/2020
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Go is not only suitable for complex server programs, but it also cuts a fine figure with simple command-line tools for automating everyday life. Mike Schilli restructures the signature of a PDF manipulation tool.

One of my favorite tools at the command line is the PDFtk utility, a veritable Swiss Army knife for merging PDF documents. However, when called, the tool expects unusual syntax for passing parameters, which I find hard to memorize and type every time. That's why I decided to wire up a variant in Go, which tries to guess what the user wants. En route to doing this, the inclined reader will discover how Go reads and writes files, extracts and manipulates single characters from strings, and calls external programs with interactive input, as well as find out how to cross-compile Go programs for various platforms.

For close to a decade now, I've been digitizing paper books and magazines with my scanner and then tossing them into the recycling bin. Sometimes a book comes out as two or more PDFs because the scanner got stuck between two stacks and I had to continue the scanning process with a new document. Sometimes the cover of a hardback book simply will not fit through the scanner feeder, which means that the front and back covers are individual PDF files from a flatbed scanner. PDFtk makes putting the parts together a breeze:

$ pdftk book-*.pdf cat output book.pdf

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