fix(powershell): filter ":!" commands with args #19268

Problem:
Since 0b9664f524 powershell filtered
:[range]! commands with args causes error:
"Start-Process: A positional parameter cannot be found that accepts argument ..."

Solution:
Pass args to Start-Process via `-ArgumentList`.
closes #19250

src/nvim/ex_cmds.c

@@ -1583,22 +1583,39 @@ char *make_filter_cmd(char *cmd, char *itmp, char *otmp)
   if (otmp != NULL) {
     len += STRLEN(otmp) + STRLEN(p_srr) + 2;  // two extra spaces ("  "),
   }
+
+  const char *const cmd_args = strchr(cmd, ' ');
+  len += (is_pwsh && cmd_args)
+      ? STRLEN(" -ArgumentList ") + 2  // two extra quotes
+      : 0;
+
   char *const buf = xmalloc(len);
 
+  if (is_pwsh) {
+    xstrlcpy(buf, "Start-Process ", len);
+    if (cmd_args == NULL) {
+      xstrlcat(buf, cmd, len);
+    } else {
+      xstrlcpy(buf + STRLEN(buf), cmd, (size_t)(cmd_args - cmd + 1));
+      xstrlcat(buf, " -ArgumentList \"", len);
+      xstrlcat(buf, cmd_args + 1, len);  // +1 to skip the leading space.
+      xstrlcat(buf, "\"", len);
+    }
 #if defined(UNIX)
     // Put delimiters around the command (for concatenated commands) when
     // redirecting input and/or output.
-  if (is_pwsh) {
-    xstrlcpy(buf, "Start-Process ", len);
-    xstrlcat(buf, cmd, len);
   } else if (itmp != NULL || otmp != NULL) {
     char *fmt = is_fish_shell ? "begin; %s; end"
                               :       "(%s)";
     vim_snprintf(buf, len, fmt, cmd);
+#endif
+    // For shells that don't understand braces around commands, at least allow
+    // the use of commands in a pipe.
   } else {
     xstrlcpy(buf, cmd, len);
   }
 
+#if defined(UNIX)
   if (itmp != NULL) {
     if (is_pwsh) {
       xstrlcat(buf, " -RedirectStandardInput ", len - 1);
@@ -1608,14 +1625,6 @@ char *make_filter_cmd(char *cmd, char *itmp, char *otmp)
     xstrlcat(buf, itmp, len - 1);
   }
 #else
-  // For shells that don't understand braces around commands, at least allow
-  // the use of commands in a pipe.
-  if (is_pwsh) {
-    xstrlcpy(buf, "Start-Process ", len);
-    xstrlcat(buf, cmd, len);
-  } else {
-    xstrlcpy(buf, cmd, len);
-  }
   if (itmp != NULL) {
     // If there is a pipe, we have to put the '<' in front of it.
     // Don't do this when 'shellquote' is not empty, otherwise the

test/functional/vimscript/system_spec.lua

@@ -630,7 +630,7 @@ end)
 describe('shell :!', function()
   before_each(clear)
 
-  it(':{range}! with powershell filter/redirect #16271', function()
+  it(':{range}! with powershell filter/redirect #16271 #19250', function()
     local screen = Screen.new(500, 8)
     screen:attach()
     local found = helpers.set_shell_powershell(true)
@@ -639,18 +639,25 @@ describe('shell :!', function()
       1
       4
       2]])
-    feed(':4verbose %!sort<cr>')
+    if iswin() then
+      feed(':4verbose %!sort /R<cr>')
       screen:expect{
-      any=[[Executing command: .?Start%-Process sort %-RedirectStandardInput .* %-RedirectStandardOutput .* %-NoNewWindow %-Wait]]
+        any=[[Executing command: .?Start%-Process sort %-ArgumentList "/R" %-RedirectStandardInput .* %-RedirectStandardOutput .* %-NoNewWindow %-Wait]]
       }
+    else
+      feed(':4verbose %!sort -r<cr>')
+      screen:expect{
+        any=[[Executing command: .?Start%-Process sort %-ArgumentList "%-r" %-RedirectStandardInput .* %-RedirectStandardOutput .* %-NoNewWindow %-Wait]]
+      }
+    end
     feed('<CR>')
     if found then
       -- Not using fake powershell, so we can test the result.
       expect([[
-        1
+        4
-        2
         3
-        4]])
+        2
+        1]])
     end
   end)
 end)