fix: make_filter_cmd for :! powershell

Problem:
`Start-Process` requires the command to be split into the shell
command and its arguments. Previously it was done by parsing, which
didn't handle cases such as
  - commands with escaped space in their filepath
  - quoted commands with space in their filepath

Solution:
Use
  - `pwsh -Command` instead of `Start-Process`
  - `Get-Content` instead of `-RedirectStandardInput`
  - `Out-File` instead of `-RedirectStandardOutput`

2 files changed, 5 insertions, 5 deletions

diff --git a/test/functional/helpers.lua b/test/functional/helpers.lua
index 3aec834bea..4fcc190dee 100644
--- a/test/functional/helpers.lua
+++ b/test/functional/helpers.lua
@@ -562,16 +562,16 @@ function module.set_shell_powershell(fake)
     assert(found)
   end
   local shell = found and (iswin() and 'powershell' or 'pwsh') or module.testprg('pwsh-test')
-  local set_encoding = '[Console]::InputEncoding=[Console]::OutputEncoding=[System.Text.Encoding]::UTF8;'
+  local set_encoding = '[Console]::InputEncoding=[Console]::OutputEncoding=[System.Text.UTF8Encoding]::new();'
   local cmd = set_encoding..'Remove-Item -Force '..table.concat(iswin()
-    and {'alias:cat', 'alias:echo', 'alias:sleep'}
+    and {'alias:cat', 'alias:echo', 'alias:sleep', 'alias:sort'}
     or  {'alias:echo'}, ',')..';'
   module.exec([[
     let &shell = ']]..shell..[['
     set shellquote= shellxquote=
     let &shellcmdflag = '-NoLogo -NoProfile -ExecutionPolicy RemoteSigned -Command ]]..cmd..[['
     let &shellpipe = '2>&1 | Out-File -Encoding UTF8 %s; exit $LastExitCode'
-    let &shellredir = '-RedirectStandardOutput %s -NoNewWindow -Wait'
+    let &shellredir = '2>&1 | Out-File -Encoding UTF8 %s; exit $LastExitCode'
   ]])
   return found
 end
diff --git a/test/functional/vimscript/system_spec.lua b/test/functional/vimscript/system_spec.lua
index a778e2f435..d0061d051e 100644
--- a/test/functional/vimscript/system_spec.lua
+++ b/test/functional/vimscript/system_spec.lua
@@ -642,12 +642,12 @@ describe('shell :!', function()
     if iswin() then
       feed(':4verbose %!sort /R<cr>')
       screen:expect{
-        any=[[Executing command: .?Start%-Process sort %-ArgumentList "/R" %-RedirectStandardInput .* %-RedirectStandardOutput .* %-NoNewWindow %-Wait]]
+        any=[[Executing command: .?Get%-Content .* | & sort /R 2>&1 | Out%-File %-Encoding UTF8 .*; exit $LastExitCode]]
       }
     else
       feed(':4verbose %!sort -r<cr>')
       screen:expect{
-        any=[[Executing command: .?Start%-Process sort %-ArgumentList "%-r" %-RedirectStandardInput .* %-RedirectStandardOutput .* %-NoNewWindow %-Wait]]
+        any=[[Executing command: .?Get%-Content .* | & sort %-r 2>&1 | Out%-File %-Encoding UTF8 .*; exit $LastExitCode]]
       }
     end
     feed('<CR>')