How to tell what packages you have used in R

Question

I have a very long R script with many if statements and exception cases. As i\'ve been going, if been importing and testing libraries as I\'ve gone and haven\'t really docum

Answer 1

I had a similar need when I needed to convert my code into a package, thus I need to identify every package dependency and either import or use full qualified name.

In reading book Extending R I found XRtools::makeImports can scan a package and find all packages need to be imported. This doesn't solve our problem yet as it only apply to existing package, but it provided the main insight on how to do it.

I made a function and put it into my package mischelper. You can install the package, either use the RStudio addin menu to scan current file or selected code, or use command line functions. Every external function (fun_inside) and the function that called it (usage) will be listed in table.

You can now go to each function, press F1 to find which package it belongs. I actually have another package that can scan all installed packages for function names and build a database, but that may cause more false positives for this usage because if you only loaded some packages, pressing F1 only search loaded packages.

See details of the usage in my package page

https://github.com/dracodoc/mischelper