completers/unlink_completer/unlink_completer.ps1
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# unlink tab completion for PowerShell # Static option completion for unlink.exe and unlink. Set-StrictMode -Version 2.0 function Get-UnlinkCompletionOptions { $cache = Get-Variable -Name 'UnlinkCompletionOptions' -Scope Script -ErrorAction Ignore if ($null -ne $cache -and $null -ne $cache.Value) { return $cache.Value } $fallbackOptions = @('--help', '--version') $commandCandidates = @('unlink.exe', 'unlink') foreach ($candidate in $commandCandidates) { $command = Get-Command -Name $candidate -ErrorAction Ignore if ($null -eq $command) { continue } try { $helpOutput = $null | & $command.Source --help 2>&1 | ForEach-Object { $_ -replace '\e\[[0-9;?]*[ -/]*[@-~]', '' } | Out-String } catch { continue } if ([string]::IsNullOrWhiteSpace($helpOutput)) { continue } $options = [System.Collections.Generic.HashSet[string]]::new([System.StringComparer]::Ordinal) $descriptions = [System.Collections.Hashtable]::new([System.StringComparer]::Ordinal) foreach ($line in ([regex]::Split($helpOutput, '\r?\n'))) { foreach ($match in [regex]::Matches($line, '(?<!\S)(--?[A-Za-z0-9][A-Za-z0-9-]*)(?=(\s|,|=|\[|$))')) { $rawOption = $match.Groups[1].Value $normalized = $rawOption.Trim() if ($normalized.StartsWith('--')) { $normalized = $normalized -replace '\[.*$', '' $normalized = $normalized -replace '=.*$', '' } if ($normalized -match '^-{1,2}[A-Za-z0-9][A-Za-z0-9-]*$') { [void]$options.Add($normalized) if (-not $descriptions.ContainsKey($normalized)) { $description = ($line -replace '^\s*(?:-{1,2}[A-Za-z0-9][A-Za-z0-9-]*(?:[=\[]\S*)?[,\s]+)+', '').Trim() if ($description -and $description -ne $line.Trim()) { $descriptions[$normalized] = $description } } } } } if ($options.Count -gt 0) { Set-Variable -Name 'UnlinkCompletionOptions' -Value (@($options | Sort-Object)) -Scope Script Set-Variable -Name 'UnlinkCompletionDescriptions' -Value $descriptions -Scope Script return (Get-Variable -Name 'UnlinkCompletionOptions' -Scope Script).Value } } Set-Variable -Name 'UnlinkCompletionOptions' -Value $fallbackOptions -Scope Script return (Get-Variable -Name 'UnlinkCompletionOptions' -Scope Script).Value } function New-UnlinkCompletionResult { param( [string]$CompletionText, [string]$ResultType, [string]$ToolTip, [string]$ListItemText ) if ([string]::IsNullOrWhiteSpace($ListItemText)) { $ListItemText = $CompletionText } if ([string]::IsNullOrWhiteSpace($ToolTip)) { $ToolTip = $CompletionText } [System.Management.Automation.CompletionResult]::new( $CompletionText, $ListItemText, $ResultType, $ToolTip ) } function ConvertFrom-UnlinkTypedWord { # The value of a typed word. A word opened with a quote (ASCII or typographic) is read by # the PowerShell tokenizer, which drops the quotes and undoes that quote style's escapes, # even when the word is an unterminated quote running to the cursor. param([string]$Value) if ($Value -notmatch '^[''"\u2018-\u201E]') { return $Value } $tokens = $null $parseErrors = $null [void][System.Management.Automation.Language.Parser]::ParseInput($Value, [ref]$tokens, [ref]$parseErrors) $tokens[0].Value } function ConvertTo-UnlinkQuotedValue { # Renders a value as one PowerShell argument: bare when safe and no quote was typed, # otherwise in the quote the user typed (single by default). PowerShell reads ' and # U+2018-U+201B as single quotes and " and U+201C-U+201E as double quotes. param( [string]$Value, [string]$QuoteChar = '' ) if ([string]::IsNullOrEmpty($Value)) { return $Value } if (-not $QuoteChar) { if ($Value -notmatch '[\s{}();,|&<>''"`$@#\u2018-\u201E]') { return $Value } $QuoteChar = "'" } if ($QuoteChar -match '^[''\u2018-\u201B]$') { return $QuoteChar + ($Value -replace '([''\u2018-\u201B])', '$1$1') + $QuoteChar } $QuoteChar + ($Value -replace '([`"$\u201C-\u201E])', '`$1') + $QuoteChar } function Get-UnlinkCurrentToken { param( [System.Management.Automation.Language.CommandAst]$CommandAst, [int]$CursorPosition, [string]$Fallback ) # The parser keeps an unterminated quote as one element running to the # cursor, so the word under the cursor is read from the AST, not by splitting # the line on whitespace. foreach ($element in @($CommandAst.CommandElements | Select-Object -Skip 1)) { $extent = $element.Extent if ($extent.StartOffset -lt $CursorPosition -and $CursorPosition -le $extent.EndOffset) { return $extent.Text.Substring(0, $CursorPosition - $extent.StartOffset) } } # No element under the cursor (it sits in whitespace): the engine's word is empty. $Fallback } function Get-UnlinkPathCompletions { param([string]$InputPath) $cleanInput = ConvertFrom-UnlinkTypedWord -Value $InputPath $quoteChar = if ($InputPath -match '^[''"\u2018-\u201E]') { $InputPath.Substring(0, 1) } else { '' } if ([string]::IsNullOrWhiteSpace($cleanInput)) { $parent = '.' $leaf = '' } elseif ($cleanInput -match '[\\/]+$') { $parent = $cleanInput $leaf = '' } else { $parent = Split-Path -Path $cleanInput -Parent if ([string]::IsNullOrWhiteSpace($parent)) { $parent = '.' } $leaf = Split-Path -Path $cleanInput -Leaf } if (-not (Test-Path -LiteralPath $parent -PathType Container -ErrorAction Ignore)) { return @() } $items = @(Get-ChildItem -LiteralPath $parent -ErrorAction Ignore) $items = $items | Where-Object { $_.Name -like ([System.Management.Automation.WildcardPattern]::Escape($leaf) + '*') } | Sort-Object -Property Name # The directory part is kept exactly as typed (including a leading .\ or ./). A bare # name starting with a dash would parse as a parameter, so it gets a .\ prefix, the # way PowerShell's own file completion does. $typedDirectory = if ([string]::IsNullOrWhiteSpace($cleanInput) -or -not $cleanInput.EndsWith($leaf, [System.StringComparison]::Ordinal)) { '' } else { $cleanInput.Substring(0, $cleanInput.Length - $leaf.Length) } foreach ($item in $items) { $pathText = $typedDirectory + $item.Name if (-not $typedDirectory -and $item.Name -match '^[-\u2013-\u2015]') { $pathText = '.' + [System.IO.Path]::DirectorySeparatorChar + $pathText } if ($item.PSIsContainer -and -not $pathText.EndsWith([System.IO.Path]::DirectorySeparatorChar)) { $pathText += [System.IO.Path]::DirectorySeparatorChar } $quotedPath = ConvertTo-UnlinkQuotedValue -Value $pathText -QuoteChar $quoteChar if ($item.PSIsContainer) { New-UnlinkCompletionResult -CompletionText $quotedPath -ListItemText $pathText -ResultType 'ProviderContainer' -ToolTip $item.FullName } else { New-UnlinkCompletionResult -CompletionText $quotedPath -ListItemText $pathText -ResultType 'ProviderItem' -ToolTip $item.FullName } } } function Get-UnlinkOptionDescription { param([string]$Option) $cache = Get-Variable -Name 'UnlinkCompletionDescriptions' -Scope Script -ErrorAction Ignore if ($null -ne $cache -and $null -ne $cache.Value -and $cache.Value.ContainsKey($Option)) { return $cache.Value[$Option] } 'Option for unlink.' } function Complete-Unlink { param( [string]$wordToComplete, [System.Management.Automation.Language.CommandAst]$commandAst, [int]$cursorPosition ) $currentWord = if ($cursorPosition -gt $commandAst.Extent.EndOffset) { '' } else { Get-UnlinkCurrentToken -CommandAst $commandAst -CursorPosition $cursorPosition -Fallback $wordToComplete } if ([string]::IsNullOrEmpty($currentWord)) { return @() } if ($currentWord.StartsWith('-')) { return @( foreach ($option in Get-UnlinkCompletionOptions) { if ($option.StartsWith($currentWord, [System.StringComparison]::Ordinal)) { New-UnlinkCompletionResult -CompletionText $option -ListItemText $option -ResultType 'ParameterName' -ToolTip (Get-UnlinkOptionDescription -Option $option) } } ) } Get-UnlinkPathCompletions -InputPath $currentWord } Register-ArgumentCompleter -Native -CommandName 'unlink', 'unlink.exe' -ScriptBlock { param($wordToComplete, $commandAst, $cursorPosition) Complete-Unlink -wordToComplete $wordToComplete -commandAst $commandAst -cursorPosition $cursorPosition } |