Adds escape codes to the prompt for the shell integration

ShellIntegration.ps1

# Reference:
# https://devblogs.microsoft.com/commandline/shell-integration-in-the-windows-terminal/

param
(
    [ValidateSet('WindowsTerminal', 'ITerm2')]
    [String]$TerminalProgram = 'WindowsTerminal'
)

# Restore hooked functions in case this script is executed accidentally twice
if ($global:shellIntegrationGlobals) {
    $function:global:PSConsoleHostReadLine = $global:shellIntegrationGlobals.originalPSConsoleHostReadLine
    $function:global:Prompt = $global:shellIntegrationGlobals.originalPrompt
}

$global:shellIntegrationGlobals = @{
    terminalProgram = $TerminalProgram
    originalPSConsoleHostReadLine = $function:global:PSConsoleHostReadLine
    originalPrompt = $function:global:Prompt
    lastCommand = $null

    getExitCode = {
        param ($lastCommandStatus)
        if ($lastCommandStatus -eq $true) {
            return 0
        }

        if ($Error[0]) {
            $lastHistory = Get-History -Count 1
            $isPowerShellError = $Error[0].InvocationInfo.HistoryId -eq $lastHistory.Id
        }

        if ($isPowerShellError) {
            return 1
        }
        else {
            return $LastExitCode
        }
    }
}

$function:global:PSConsoleHostReadLine = {
    $commandExecuted = "`e]133;C`a"
    $command = $global:shellIntegrationGlobals.originalPSConsoleHostReadLine.Invoke()

    $commandExecuted | Write-Host -NoNewLine
    $command

    $global:shellIntegrationGlobals.lastCommand = $command
}

$function:global:Prompt = {
    $lastCommandStatus = $?

    if ($global:shellIntegrationGlobals.lastCommand) {
        $exitCode = $global:shellIntegrationGlobals.getExitCode.Invoke($lastCommandStatus)
        $commandFinished = "`e]133;D;$exitCode`a"
    }
    else {
        $commandFinished = "`e]133;D`a"
    }

    $currentLocation = $ExecutionContext.SessionState.Path.CurrentLocation.Path
    switch ($global:shellIntegrationGlobals.terminalProgram) {
        'WindowsTerminal' { $setWorkingDirectory = "`e]9;9;`"$currentLocation`"`a" }
        'ITerm2' { $setWorkingDirectory = "`e]1337;CurrentDir=$currentLocation`a" }
    }

    $promptStarted = "`e]133;A`a"
    $commandStarted = "`e]133;B`a"
    $prompt = $global:shellIntegrationGlobals.originalPrompt.Invoke()

    $commandFinished + $promptStarted + $setWorkingDirectory + $prompt + $commandStarted
}

Supported iTerm2 on macOS.

& 'PathTo/ShellIntegration.ps1' -TerminalProgram ITerm2