new: pwsh completion for tree.com

extra_configs/completions/tree_completion.ps1

@@ -0,0 +1,26 @@
+# generate completion for tree.com
+# output help with UTF-8
+
+"tree", "tree.com" | Foreach-Object {
+    Register-ArgumentCompleter -Native -CommandName $_ -ScriptBlock {
+        param($wordToComplete, $commandAst, $cursorPosition)
+
+        $commands = @{
+            cmd = "/F"; desc = "Display the names of the files in each folder."
+        }, @{
+            cmd = "/A"; desc = "Use ASCII instead of extended characters."
+        }
+
+        # [string[]]$list = if ([string]$wordToComplete -eq "") {
+        #     $commands
+        # } else {
+        #     $commands | Where-Object {
+        #         $_.cmd -match $wordToComplete 
+        #     }
+        # }
+
+        $commands | ForEach-Object {
+            [System.Management.Automation.CompletionResult]::new($_.cmd, $_.cmd, 'ParameterValue', $_.desc)
+        }
+    }
+}