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Tab completion finds inapplicable dynamic parameter names by single-character prefix #11848

mklement0 opened this issue Feb 14, 2020 · 0 comments


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@mklement0 mklement0 commented Feb 14, 2020

See #11835 for background.

-Raw is a dynamic parameter specific to the PS FileSystem provider.
It should only tab-complete for (implied) paths targeting a file-system location.

Note: If you make a non-file-system location such as env:\ the current location before running the tests, the symptom does not surface.

Steps to reproduce

Push-Location ('/', 'c:\')[$env:OS -eq 'Windows_NT']

# Expanding based on a non-existent drive after typing just "-" 
# doesn't make -Raw appear, as expected.
$script = 'Get-Content -Path nosuch:\test -'
TabExpansion2 -inputScript $script -cursorColumn $script.Length | % {
  $_.CompletionMatches.CompletionText } | Should -Not -Contain '-Raw'

# Typing "-ra" also works as epected. 
$script = 'Get-Content -Path nosuch:\test -ra'
TabExpansion2 -inputScript $script -cursorColumn $script.Length | % {
  $_.CompletionMatches.CompletionText } | Should -Not -Contain '-Raw'

# Typing "-r" - a SINGLE-letter prefix - unexpectedly DOES make -Raw appear.
$script = 'Get-Content -Path nosuch:\test -r'
TabExpansion2 -inputScript $script -cursorColumn $script.Length | %  {
  $_.CompletionMatches.CompletionText } | Should -Not -Contain '-Raw'

Expected behavior

All tests should succeed.

Actual behavior

The last test fails:

Expected '-Raw' to not be found in collection @('-ReadCount', '-Raw'), but it was found.

Environment data

PowerShell Core 7.0.0-rc.2
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