History Search Example

[mdgrs-mei]

An example that replaces the Ctrl+r history search with fuzzy search.

• Multi-line commands are supported
• Duplicates are removed
• Enter to run the command and Shift+Enter to insert the command
• The characters typed before pressing Ctrl+r are used as an initial query
• It should be easy to add Delete from History with an action key when deleting an entry is supported one day

Import-Module PowerShellRun

Set-PSReadLineKeyHandler -Key 'Ctrl+r' -ScriptBlock {
    [Microsoft.PowerShell.PSConsoleReadLine]::ClearScreen()

    $cursorPos = $null
    $initialQuery = $null
    [Microsoft.PowerShell.PSConsoleReadLine]::GetBufferState([ref]$initialQuery, [ref]$cursorPos)

    $historyItems = [Microsoft.PowerShell.PSConsoleReadLine]::GetHistoryItems()
    [Array]::Reverse($historyItems)

    $historySet = [System.Collections.Generic.Hashset[string]]::new([System.StringComparer]::OrdinalIgnoreCase)
    foreach ($item in $historyItems) {
        $historySet.Add($item.CommandLine) | Out-Null
    }

    $context = [PowerShellRun.SelectorContext]::new()
    $context.Query = $initialQuery

    $actionKeys = @(
        [PowerShellRun.ActionKey]::new('Enter', 'Execute')
        [PowerShellRun.ActionKey]::new('Shift+Enter', 'Insert')
    )

    $result = $historySet | ForEach-Object {
        $entry = [PowerShellRun.SelectorEntry]::new()
        $entry.Name = $_
        $entry.Preview = $_
        $entry.ActionKeys = $actionKeys
        $entry
    } | Invoke-PSRunSelectorCustom -Context $context

    $command = $result.FocusedEntry.Name
    if ($command) {
        [Microsoft.PowerShell.PSConsoleReadLine]::RevertLine()
        [Microsoft.PowerShell.PSConsoleReadLine]::Insert($command)
        if ($result.KeyCombination -eq 'Enter') {
            [Microsoft.PowerShell.PSConsoleReadLine]::AcceptLine()
        }
    } else {
        [Microsoft.PowerShell.PSConsoleReadLine]::SetCursorPosition($cursorPos)
    }
}

[mdgrs-mei]

[mdgrs-mei]

An improved version has been added to #37.