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rpgle-repl is a REPL tool for the RPG language on IBM i. A REPL (Read-Evaluate-Print-Loop) program allows you to code small snippets and get immediate feedback on their execution.

Why rpgle-repl?

Some of my most frequently asked questions are "how do these %BIFs (built in functions) respond to different inputs?" and "how do I write a free-format equivalent to this fixed format code?". To answer them, I would inevitably write a small program, set a breakpoint, and run it in debug to evaluate whichever variable I cared about at runtime.

rpgle-repl streamlines this process - not only automatically compiling snippets of code, but also dynamically recording changed variables and displaying the results on screen.

Check out this basic example:

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Getting started

• Install and Launch repl
• Philosophy and technical overview
• The main features
• Navigating the repl interface

Acknowledgements

• @martintosney - for ceaseless encouragement and feedback as repl took shape, and taking entire responsibility for finding a way to deploy it
• @martintosney, @G-Goldstein and @burns238 for neverending cups of tea and being my earliest test subjects