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I am so excited to see discussions of dependency networks and watchers for changed code/data!
However, I think the examples of tools could be improved. ProjectTemplate and knitr are not true pipeline toolkits. They were not designed for this purpose, and they lack scalability and extensibility. On the other hand, most serious pipeline toolkits, such as GNU Make, were not designed for R.
Remake, Ruigi, and the drake R package (not to be confused with Factual's drake) meet both sets of criteria. Of the three, only drake is currently on CRAN, and I think it is the most R-focused and Tidyverse-friendly. Plus, the interactive visual DAGs help users understand how the multiple options for high-performance computing play out in practice.
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