TabExpansion2.ps1
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<#PSScriptInfo
.VERSION 1.0.4 .AUTHOR Roman Kuzmin .COPYRIGHT (c) Roman Kuzmin .GUID 550bc198-dd44-4bbc-8ad7-ccf4b8bd2aff .TAGS TabExpansion2, Register-ArgumentCompleter .LICENSEURI http://www.apache.org/licenses/LICENSE-2.0 .PROJECTURI https://github.com/nightroman/FarNet/blob/master/PowerShellFar/TabExpansion2.ps1 #> <# .Synopsis TabExpansion2 with completers added by profiles. .Description The script replaces the built-in function TabExpansion2, creates the table TabExpansionOptions, and does nothing else. Initialization is performed on the first code completion via profiles *ArgumentCompleters.ps1. $TabExpansionOptions consists of empty entries: CustomArgumentCompleters = @{} NativeArgumentCompleters = @{} ResultProcessors = @() InputProcessors = @() Initialization via profiles. When TabExpansion2 is called the first time it invokes scripts like *ArgumentCompleters.ps1 found in the path. They add their completers to the options. TabExpansion2.ps1 (with extension if it is in the path) should be invoked in the beginning of an interactive session. Modules and other tools on loading may check for existence of the table and add their completers. Any found profile and completer issues are written as silent errors. Examine the variable $Error on troubleshooting. Extra table options: IgnoreHiddenShares $true tells to ignore hidden UNC shares. LiteralPaths $true tells to not escape special file characters. RelativePaths $true tells to replace paths with relative paths. $false tells to replace paths with absolute paths. Consider to use Register-ArgumentCompleter instead of adding completers to options directly. In this case *ArgumentCompleters.ps1 are compatible with v5 native and TabExpansionPlusPlus registrations. Consider to use Register-InputCompleter and Register-ResultCompleter instead of adding completers to options directly. .Link wiki https://github.com/nightroman/FarNet/wiki/TabExpansion2 #> # The global option table New-Variable -Force -Name TabExpansionOptions -Scope Global -Description 'Custom completers and options.' -Value @{ CustomArgumentCompleters = @{} NativeArgumentCompleters = @{} ResultProcessors = @() InputProcessors = @() } # Temporary initialization variable $global:TabExpansionProfile = $true <# .Synopsis Registers argument completers. .Description This command registers a script block as a completer for specified commands or parameter. It is compatible with v5 native and TabExpansionPlusPlus. #> function global:Register-ArgumentCompleter { [CmdletBinding(DefaultParameterSetName = 'PowerShellSet')] param( [Parameter(ParameterSetName = 'NativeSet', Mandatory = $true)] [Parameter(ParameterSetName = 'PowerShellSet')] [string[]]$CommandName = '', [Parameter(ParameterSetName = 'PowerShellSet', Mandatory = $true)] [string]$ParameterName = '', [Parameter(Mandatory = $true)] [scriptblock]$ScriptBlock, [Parameter(ParameterSetName = 'NativeSet')] [switch]$Native ) $key = if ($Native) {'NativeArgumentCompleters'} else {'CustomArgumentCompleters'} foreach ($command in $CommandName) { if ($command -and $ParameterName) { $command += ":" } $TabExpansionOptions[$key]["${command}${ParameterName}"] = $ScriptBlock } } <# .Synopsis Registers input completers. .Description Input completers work before native. Each completer is invoked with the arguments $ast, $tokens, $positionOfCursor, $options. It returns either nothing in order to continue or a CommandCompletion instance which is used as the result. Register-InputCompleter is only used with this TabExpansion2.ps1, unlike Register-ArgumentCompleter which may be used in other cases. .Outputs [System.Management.Automation.CommandCompletion] #> function global:Register-InputCompleter { [CmdletBinding()] param( [Parameter(Mandatory = $true)] [scriptblock]$ScriptBlock ) $TabExpansionOptions.InputProcessors += $ScriptBlock } <# .Synopsis Registers result completers. .Description Result completers work after native. They are invoked with the arguments $result $ast $tokens $positionOfCursor $options. They should not return anything, they should either do nothing or alter the $result. Register-InputCompleter is only used with this TabExpansion2.ps1, unlike Register-ArgumentCompleter which may be used in other cases. #> function global:Register-ResultCompleter { [CmdletBinding()] param( [Parameter(Mandatory = $true)] [scriptblock]$ScriptBlock ) $TabExpansionOptions.ResultProcessors += $ScriptBlock } function global:TabExpansion2 { [CmdletBinding(DefaultParameterSetName = 'ScriptInputSet')] param( [Parameter(ParameterSetName = 'ScriptInputSet', Mandatory= $true, Position = 0)] [string]$inputScript, [Parameter(ParameterSetName = 'ScriptInputSet', Mandatory = $true, Position = 1)] [int]$cursorColumn, [Parameter(ParameterSetName = 'AstInputSet', Mandatory = $true, Position = 0)] [System.Management.Automation.Language.Ast]$ast, [Parameter(ParameterSetName = 'AstInputSet', Mandatory = $true, Position = 1)] [System.Management.Automation.Language.Token[]]$tokens, [Parameter(ParameterSetName = 'AstInputSet', Mandatory = $true, Position = 2)] [System.Management.Automation.Language.IScriptPosition]$positionOfCursor, [Parameter(ParameterSetName = 'ScriptInputSet', Position = 2)] [Parameter(ParameterSetName = 'AstInputSet', Position = 3)] [Hashtable]$options ) ${private:*} = @{ inputScript = $inputScript cursorColumn = $cursorColumn ast = $ast tokens = $tokens positionOfCursor = $positionOfCursor options = $options } Remove-Variable inputScript, cursorColumn, ast, tokens, positionOfCursor, options # take/init global options if (!${*}.options) { ${*}.options = $PSCmdlet.GetVariableValue('TabExpansionOptions') if ($PSCmdlet.GetVariableValue('TabExpansionProfile')) { Remove-Variable -Name TabExpansionProfile -Scope Global foreach($_ in Get-Command -Name *ArgumentCompleters.ps1 -CommandType ExternalScript -All) { if (& $_.Definition) { Write-Error -ErrorAction 0 "TabExpansion2: Unexpected output. Profile: $($_.Definition)" } } } } # parse input if ($PSCmdlet.ParameterSetName -eq 'ScriptInputSet') { $_ = [System.Management.Automation.CommandCompletion]::MapStringInputToParsedInput(${*}.inputScript, ${*}.cursorColumn) ${*}.ast = $_.Item1 ${*}.tokens = $_.Item2 ${*}.positionOfCursor = $_.Item3 } # input processors foreach($_ in ${*}.options['InputProcessors']) { if (${*}.result = & $_ ${*}.ast ${*}.tokens ${*}.positionOfCursor ${*}.options) { if (${*}.result -is [System.Management.Automation.CommandCompletion]) { return ${*}.result } Write-Error -ErrorAction 0 "TabExpansion2: Invalid result. Input processor: $_" } } # native ${*}.result = [System.Management.Automation.CommandCompletion]::CompleteInput(${*}.ast, ${*}.tokens, ${*}.positionOfCursor, ${*}.options) # result processors? if ((${*}.processors = ${*}.options['ResultProcessors'])) { # work around read only if (${*}.result.CompletionMatches.IsReadOnly) { if (${*}.result.CompletionMatches) { return ${*}.result } ${*}.result = &{ param(${*}) function TabExpansion {'*'} [System.Management.Automation.CommandCompletion]::CompleteInput("$(${*}.ast)", ${*}.positionOfCursor.Offset, $null) } ${*} ${*}.result.CompletionMatches.Clear() } # invoke processors foreach($_ in ${*}.processors) { if (& $_ ${*}.result ${*}.ast ${*}.tokens ${*}.positionOfCursor ${*}.options) { Write-Error -ErrorAction 0 "TabExpansion2: Unexpected output. Result processor: $_" } } } # nothing and cursor char is `\w`? try insert space if (!${*}.result.CompletionMatches -and ($_ = ${*}.inputScript) -and $_.Length -gt ${*}.cursorColumn -and $_[${*}.cursorColumn] -match '[\w$]') { return TabExpansion2 ($_.Insert(${*}.cursorColumn, ' ')) ${*}.cursorColumn } ${*}.result } |