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Dongbo Wang
d68c15e743
Implementation for PowerShell/PowerShell-RFC#391. A few implementation decisions: 1. Check the package manager list only once per process (**same as CMD**). So, changing the package manager list in registry doesn't affect a PowerShell session that is already running. 2. When detecting user/system PATH value changes, only check new items PREPENDED or APPENDED to the original string (**same as CMD**). The detection is made simple, which is not intended to detect complex changes to the user/system PATH. 3. The PATH update feature is disabled when the `Environment` provider is not available, or when the current session is restricted. - Both `Environment` provider and `IsSessionRestricted` are checked only once per PowerShell session. - Use `ConditionalWeakTable` to cache whether the feature is enabled or not for a given session. - We cannot use `thread-static` variable for the caching because it's possible for Runspace to reuse threads.
Testing
The tests are organized by testing language. Thus Pester tests, which are written in the PowerShell language, are in ./powershell and xUnit tests, written in C#, are in ./xUnit. The third-party shebang test is in ./shebang.