Windows Time TUI in PowerShell

time-tui.ps

$ErrorActionPreference = "Continue"

[Console]::OutputEncoding = [System.Text.Encoding]::UTF8

try {
    $ScriptDir = if ($PSScriptRoot) { $PSScriptRoot } else { Split-Path -Parent $MyInvocation.MyCommand.Path }
    
    . "$ScriptDir/config.ps1"
    
    $ESC = [char]27
    $HideCursor = "$ESC[?25l"
    $ShowCursor = "$ESC[?25h"
    $ClearScreen = "$ESC[2J"
    $ClearLine = "$ESC[2K"
    
    $ColorLabel = "$ESC[1;36m"     # Bold Cyan
    $ColorTime  = "$ESC[1;32m"     # Bold Green
    $ColorDate  = "$ESC[90m"       # Gray
    $ColorLine  = "$ESC[38;5;237m" # Dark Gray
    $ResetColor = "$ESC[0m"
    
    $IconLocation = [char]::ConvertFromUtf32(0xED00)
    $IconClock    = [char]::ConvertFromUtf32(0xF43A)
    $IconCalendar = [char]::ConvertFromUtf32(0xF00ED)
    
    function Write-TimeZones {
        $labels = @($TimeZones.Keys)
        $screenWidth = $host.UI.RawUI.WindowSize.Width
        $contentWidth = 40
        $padding = [Math]::Max(0, [Math]::Floor(($screenWidth - $contentWidth) / 2))
        $indent = " " * $padding

        for ($i = 0; $i -lt $labels.Count; $i++) {
            $label = $labels[$i]
            $tz = $TimeZones[$label]
            $time = [System.TimeZoneInfo]::ConvertTimeBySystemTimeZoneId((Get-Date), $tz)
            $date = $time.ToString("yyyy-MM-dd")
            $timeStr = if ($Use12HourFormat) { $time.ToString("hh:mm tt") } else { $time.ToString("HH:mm") }
            
            Write-Host "$ClearLine$indent$ColorLabel$IconLocation $label$ResetColor"
            Write-Host "$ClearLine$indent  $ColorTime$IconClock  $timeStr$ResetColor"
            Write-Host "$ClearLine$indent  $ColorDate$IconCalendar  $date$ResetColor"
            if ($i -lt $labels.Count - 1) {
                Write-Host "$ClearLine$indent$ColorLine$('-' * 28)$ResetColor"
            }
        }
    }
    
    function Get-LineCount {
        return $TimeZones.Count * 3 + ($TimeZones.Count - 1)
    }
    
    function Main {
        $host.UI.RawUI.WindowTitle = "Time TUI"
        Write-Host $HideCursor -NoNewline
        Write-Host $ClearScreen -NoNewline
        $lastHeight = 0
        
        while ($true) {
            $lastLines = Get-LineCount
            $screenHeight = $host.UI.RawUI.WindowSize.Height
            if ($screenHeight -le 0) { $screenHeight = 24 }
            
            if ($screenHeight -ne $lastHeight) {
                Write-Host $ClearScreen -NoNewline
                $lastHeight = $screenHeight
            }
            
            $topPadding = [Math]::Max(0, [Math]::Floor(($screenHeight - $lastLines) / 2))
            
            [Console]::SetCursorPosition(0, 0)
            if ($topPadding -gt 0) {
                Write-Host ("$ClearLine`n" * $topPadding) -NoNewline
            }
            Write-TimeZones
        
            Start-Sleep -Seconds $UpdateIntervalSeconds
        }
    }
    
    Main
}
catch {
    Write-Host "Error: $_" -ForegroundColor Red
}
finally {
    if ($ShowCursor) { Write-Host "$ShowCursor" -NoNewline }
    Write-Host ""
    Read-Host "Press Enter to exit"
}