Install the PSReadline Autocomplete Beta

Install-PSReadlineAutocompleteBeta.ps1

#requires -version 5
<#
.EXAMPLE
pwsh.exe -noni -nop -c "iwr -useb https://git.io/InstallPSReadlineAutocompleteBeta.ps1 | iex"
#>
param (
    #Path to Install the Module. Will default to the user module folder
    $ModuleInstallPath,
    $TempZipPath = [io.path]::ChangeExtension([io.path]::GetTempFileName(), '.zip'),
    #Change this if your vscode isn't installed in a typical location
    [String[]]$vsCodeDataFolder = (Resolve-Path -Path ([IO.Path]::Combine(
        $HOME,
        ".vscode*",
        "extensions",
        "ms-vscode.powershell-*",
        "modules"
    ))),
    $NewVersion = '2.99.99',
    $ModuleName = 'PSReadLine',
    $PSReadlineDownloadUri = 'https://github.com/PowerShell/PSReadLine/files/4396121/PSReadLine.zip',
    #If specified, don't try to detect vscode and update it
    [Switch]$SkipVSCode
)
$ErrorActionPreference = 'Stop'
if (Get-Module -Name 'PSReadLine') {
    throw 'PSReadline detected as running. You must run this where psreadline has not been loaded. Hint: pwsh -noninteractive -noprofile -c'
}

function GetUserModuleFolder {
    $myPSEdition = if ($PSEdition -eq 'Core') {'PowerShell'} else {'WindowsPowerShell'}
    if ($isLinux -or $isMacOS) {
        [IO.Path]::Combine([environment]::GetFolderPath('MyDocuments'),'.local','share',$myPSEdition.tolower(),'Modules')
    } else {
        [IO.Path]::Combine([environment]::GetFolderPath('MyDocuments'),$myPSEdition,'Modules')
    }
}
if (-not $ModuleInstallPath) {$ModuleInstallPath = GetUserModuleFolder}


Write-Host -nonewline -fore Cyan 'Downloading experimental PSReadline version...'
#IWR's write-progress slows down the downoad on some versions of Powershell
([net.webclient]::new()).DownloadFile(
    $PSReadlineDownloadUri, #URI
    $TempZipPath #Destination Path
)
Write-Host -fore Green ' OK'

$psReadlinePath = [IO.Path]::Combine($moduleInstallPath,$ModuleName,$newVersion)

if (test-path $psreadlinepath) {
    write-warning 'PSReadline Experimental already detected. Deleting...'
    try {
        Remove-Item -Force -Recurse -Path $psreadlinePath 
    } catch [UnauthorizedAccessException] {
        throw 'PSReadline experimental detected as in use in another powershell session. Please close all powershell sessions before running this script'
    }
}

#Extract the folder and place it in the correct location
$psReadlineBase = (Split-Path $PSReadlinePath)
$psReadlineExtractPath = Join-Path $psReadlineBase $moduleName
Expand-Archive -Path $TempZipPath -DestinationPath $psReadlineBase -Force
#Note: PrivateData is set to something to clear the prerelease tag, due to a PSReadline issue 
Update-ModuleManifest -Path (Join-Path $psReadlineExtractPath "$moduleName.psd1") -PrivateData @{PSReadlineBeta = $true} -ModuleVersion $NewVersion
Move-Item $psReadlineExtractPath $psreadlinePath

if (-not $SkipVSCode) {
    $vsCodeDataFolder.foreach{
        $moduleDestination = Join-Path $PSItem $moduleName
        write-host -NoNewline -fore cyan "Detected $moduleDestination. Installing..."
        Remove-Item -Recurse -Force -Path $moduleDestination -ErrorAction SilentlyContinue
        if ($isLinux -or $isMacOS) {$linkType = 'SymbolicLink'} else {$linkType = 'Junction'}
        New-Item -ItemType $linkType -Path $moduleDestination -Target $psreadlinePath > $null
        Write-Host -fore Green ' OK'
    }
}


Write-Host -fore Green "Install complete! You need to reload your powershell session to apply the changes."
Write-Host -fore Cyan "You should also add this to your profile for the best experience:
Set-PSReadLineKeyHandler -Key UpArrow -Function HistorySearchBackward
Set-PSReadLineKeyHandler -Key DownArrow -Function HistorySearchForward
"
Write-Warning "This script installs the module as version 2.99.99, so any PSReadline regular updates you do will be overridden unless you remove it"
""

The module is available on Powershell Gallery now so this script is no longer necessary, just install-module psreadline -allowprerelease