Checking which packages are required to run a bunch of source files

Is there any way to check which packages are actually required by a bunch of source files? The source files were written quite a while ago, and I'd like to remove any packages I have installed that aren't actually required to run certain files.

rsconnect package has appDependencies function.
Take a look at that and its accompanying help page.

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the documentation says
This function parses all .R files in the application directory to determine what packages the application depends on; and for each of those packages what other packages they depend on.
and
Dependencies are determined by parsing application source code and looking for calls to library, require, ::, and :::.

if you are looking at code that assumes libraries are attached and never mentions their name spaces, then I think you will be out of luck from automated tools.

Does that only work for projects/packages? Mine are just a collection of source files without :: operators, it just functions on the basis that those packages are already installed

Yeah, unfortunately the code has a line at the beginning that installs and attaches libraries of a load of packages even though a lot of them aren't actually required.. I was hoping there might be a function that can inspect the actual functions called and compile a list of packages required from that but it doesn't seem likely. Thanks anyway!

you could maybe adapt this approach to find the functions.
Then you would have a seperate challenge to look up the functions against the possible packages that they might have come from