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flow

{flow} provides tools to visualize as flow diagrams the logic of functions, expressions or scripts and ease debugging.

Use cases are :

• Deciphering other people’s code
• Getting more comfortable with our own code by easing a visual understanding of its structure
• Documentation
• Debugging
• Inspect unit test results
• Providing a higher level view of an algorithm to collaborators
• Education

Installation

Install from CRAN with:

install.packages("flow")

Or install development version from github:

remotes::install_github("moodymudskipper/flow")

Example

library(flow)

Using default nomnoml engine

flow_view(rle)

Using plantuml engine (make sure the {plantuml} package is installed).

flow_view(rle, engine = "plantuml")

Additional functions

• flow_run() to display not only the diagram, but the logical path taken by a specific call
• flow_compare_runs() display the logical path of 2 calls to see where they diverge
• flow_debug()/flow_undebug() to use basically use flow_run() on a function wherever it’s called
• flow_view_vars() to display the dependencies between variables in a function
• flow_view_deps() to display recursively all the functions that your function calls
• flow_view_uses() to display recursively all the functions that call your function
• flow_view_shiny() to display the modular structure of your shiny app
• flow_view_source_calls() to display dependency tree of scripts sourcing each other
• flow_doc() to build a package’s documentation using flow diagrams
• flow_test() to show what happens in your unit tests
• flow_embed() to embed diagrams in your documentation.

See more in vignettes.

Notes

Make sure to check the vignettes for a detailed breakdown of all features.

{flow} is built on top of Javier Luraschi’s {nomnoml} package, and Rainer M Krug ’s {plantuml} package, the latter only available from github at the moment.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.