Have you inherited some powershell code with a bunch of functions but you don't know where to get started? This can help.
Kick off build-PSScriptCallGraph to get a sense of what is calling what and you'll have a good idea where to start in trying to understand that code.
This is NOT a polished product, I got it working enough to get what I needed out of it at the moment, but it should be easily expandable to wider use cases.
This has only been tested on Powershell Core 6.1 so far, but there's no reason it shouldn't work on any reasonably recent version of Powershell.
Import-Module PSDependencyGraph to get things loaded.
Example usage:
build-PSScriptCallGraph sampleScript.ps1
Or of you want to see the dependencies within this module as a PDF File (Warning: not very interesting):
get-ChildItem (get-module PSDependencyGraph).ModuleBase -Recurse -Filter *.ps1 | build-PSScriptCallGraph -OutputFormat pdf
Refer to get-help build-PSScriptCallGraph for more details
This currently only parses the given Powershell scripts for function definitions and commands. It does understand functions nested in other functions, but it doesn't understand dynamically generated functions nor does it know what to do with modules or variables.
If you want a graph to be exported, you'll need to install PSGraph.
Kevin Marquette has nicely published it in the Powershell Gallery, so a simple install-module PSGraph should do the trick. (It did for me on Powershell Core at least)
You can refer to PSGraph for informatino about installing graphviz.
If you're running powerhsell core on MacOS, a simple brew install graphviz was enough to get it going (since I had HomeBrew installed already).