[scripts/posh-vcpkg] Change TabExpansion to Register-ArgumentCompleter

scripts/posh-vcpkg.psd1

@@ -1,18 +1,18 @@
 @{
 
 # Script module or binary module file associated with this manifest.
-ModuleToProcess = 'posh-vcpkg.psm1'
+RootModule = 'posh-vcpkg.psm1'
 
 # Version number of this module.
-ModuleVersion = '0.0.1'
+ModuleVersion = '0.0.2'
 
 # ID used to uniquely identify this module
 GUID = '948f02ab-fc99-4a53-8335-b6556eef129b'
 
-# Minimum version of the Windows PowerShell engine required by this module
-PowerShellVersion = '5.0'
+# Minimum version of the PowerShell engine required by this module
+PowerShellVersion = '5.1'
 
-FunctionsToExport = @('TabExpansion')
+FunctionsToExport = @()
 CmdletsToExport = @()
 VariablesToExport = @()
 AliasesToExport = @()
@@ -24,7 +24,7 @@ PrivateData =
     PSData =
     @{
         # Tags applied to this module. These help with module discovery in online galleries.
-        Tags = @('vcpkg', 'tab', 'tab-completion', 'tab-expansion', 'tabexpansion')
+        Tags = @('vcpkg', 'tab', 'tab-completion', 'Register-ArgumentCompleter')
     }
 }
 

scripts/posh-vcpkg.psm1

@@ -1,39 +1,40 @@
-param()
-
-if (Get-Module posh-vcpkg) { return }
-
-if ($PSVersionTable.PSVersion.Major -lt 5) {
-    Write-Warning ("posh-vcpkg does not support PowerShell versions before 5.0.")
-    return
-}
-
-if (Test-Path Function:\TabExpansion) {
-    Rename-Item Function:\TabExpansion VcpkgTabExpansionBackup
-}
+Register-ArgumentCompleter -Native -CommandName vcpkg -ScriptBlock {
+    param(
+        [string]$wordToComplete,
+        [System.Management.Automation.Language.CommandAst]$commandAst,
+        [int]$cursorPosition
+    )
 
-function TabExpansion($line, $lastWord) {
-    $lastBlock = [regex]::Split($line, '[|;]')[-1].TrimStart()
+    if ($cursorPosition -lt $commandAst.CommandElements[0].Extent.EndOffset) {
+        return
+    }
 
-    switch -regex ($lastBlock) {
-        "^(?<vcpkgexe>(\./|\.\\|)vcpkg(\.exe|)) (?<remaining>.*)$"
-        {
-            & $matches['vcpkgexe'] autocomplete $matches['remaining']
-            return
-        }
+    [string]$commandText = $commandAst.CommandElements[0].Value
 
-        # Fall back on existing tab expansion
-        default {
-            if (Test-Path Function:\VcpkgTabExpansionBackup) {
-                VcpkgTabExpansionBackup $line $lastWord
+    [string[]]$textsBeforeCursor = $commandAst.CommandElements |
+        Select-Object -Skip 1 | ForEach-Object {
+            if ($_.Extent.EndOffset -le $cursorPosition) {
+                $_.Extent.Text
+            }
+            elseif ($_.Extent.StartOffset -lt $cursorPosition) {
+                $_.Extent.Text.Substring(0, $cursorPosition - $_.Extent.StartOffset)
             }
         }
-    }
-}
 
-$exportModuleMemberParams = @{
-    Function = @(
-        'TabExpansion'
+    $spaceToComplete = if ($wordToComplete -ne '') { $null }
+    elseif ($PSNativeCommandArgumentPassing -in 'Standard', 'Windows') { '' }
+    else { '""' }
+
+    [PowerShell]$cmd = [PowerShell]::Create().AddCommand($commandText).AddParameters(
+        @('autocomplete') + $textsBeforeCursor + $spaceToComplete
     )
-}
 
-Export-ModuleMember @exportModuleMemberParams
+    [string[]]$completions = $cmd.Invoke()
+
+    if ($cmd.HadErrors -or $completions.Count -eq 0) {
+        return @()
+    }
+    else {
+        return $completions
+    }
+}