Powershell how to make the prompt change on key press?

Question

I'm new to Powershell. I'm trying to create my own custom prompt that shows a truncated version of the current dir unless you expand it by pressing CTRL + R. Moreover, I would like to do this:

$short\dir\path...>
*user presses CTRL+R*
$really\really\long\full\dir\path>
*Full dir path is shown as long as CTLR + R is held down*

Answer 1

This isn't a super elegant solution, but it basically turns Ctrl + Alt + R into a hotkey for displaying the current directory. You can change the chord to "Ctrl+R" but you'll be overwriting a default PSReadlineKeyHandler for powershell. It looks like it gets stuck on the command, but if you begin typing the next line will appear. You will need to add both of these to your Microsoft.Powershell_Profile.ps1 located in $env:USERPROFILE\Documents\WindowsPowershell\

function prompt {
    if(($pwd | split-path -Parent | Split-Path -Leaf) -match ':')
    {
        "$pwd\>"
    }
    elseif (($pwd | Split-Path -Leaf) -match ':')
    {
        "$pwd>"
    }
    else {
        "...\$($pwd | split-path -Parent | Split-Path -Leaf)\$($pwd | Split-path -Leaf)\>"
    }
}

Set-PSReadlineKeyHandler -Chord "Ctrl+Alt+R" -ScriptBlock {
    write-host $pwd -nonewLine
}

Hopefully that helps!