Agnoster for Powershell [WIP]

agnoster.theme.ps1

# base code
Set-Alias ll ls
Set-Alias touch New-Item
Del alias:cd -Force
Set-Alias cd push-location -Force

# theme code 
$PSDefaultParameterValues['Out-File:Encoding'] = 'utf8'
$e = [char]0x1b
$reset = "$e[0m"

$SEGMENT_SEPARATOR = [char]0xe0b0

$CURRENT_BG='NONE'

$F = @{
  NONE = "$e[0m";
  black = "$e[30m";
  red = "$e[31m";
  green = "$e[32m";
  yellow = "$e[33m";
  blue = "$e[34m";
  magenta = "$e[35m";
  cyan = "$e[36m";
  white = "$e[37m";
}

$K = @{
  NONE = "$e[0m";
  black = "$e[40m";
  red = "$e[41m";
  green = "$e[42m";
  yellow = "$e[43m";
  blue = "$e[44m";
  magenta = "$e[45m";
  cyan = "$e[46m";
  white = "$e[47m";
}

# $batIcon = `u{1F50B}
$batIcon = [System.Char]::ConvertFromUtf32([System.Convert]::toInt32("1F50B",16))

function segment {
  param (
    $1,
    $2,
    $text
  )
  if($1 -ne $null) {
    $bg = $K[$1]
  } else {
    $bg = $K.black
  }
  if($2 -ne $null) {
    $fg = $F[$2]
  } else {
    $fg = $F.white
  }
  if($CURRENT_BG -ne 'NONE' -And $1 -ne $CURRENT_BG){
    echo "$bg$($f[$CURRENT_BG])$SEGMENT_SEPARATOR$fg";
  } else {
    echo "$bg$fg ";
  }
  $script:CURRENT_BG=$1
  if($text -ne $null){
    echo "$text ";
  }
}

function prompt_char {
  segment green black $([char]0x0394);
}

function prompt_power {
  $battery = (Get-WmiObject win32_battery)
  if($battery.Availability -eq '3' -And $battery.BatteryStatus -eq '1') {
    segment green white "$batIcon $($battery.EstimatedChargeRemaining)%";
  }
}

function prompt_context {
  segment black white "$env:UserName@$env:ComputerName";
}

function prompt_dir {
  segment blue black "$(pwd)";
}

function prompt_git {
  if((Get-Command git -errorAction SilentlyContinue) -And "$(git rev-parse --is-inside-work-tree)" -eq "true") {
    $ref = $(git rev-parse --abbrev-ref HEAD) + " $([char]0x21aa) $(git rev-parse --short HEAD)"
    segment yellow black "$ref"
  }
}

function prompt_end {
  if($CURRENT_BG -ne $null) {
    echo "$($F[$CURRENT_BG])$($K.black)$SEGMENT_SEPARATOR"
  }
  echo "$($K.black)$($F.white)";
  $CURRENT_BG = "NONE"
  echo $reset
}

function prompt {
  "$(prompt_char)$(prompt_power)$(prompt_context)$(prompt_dir)$(prompt_git)$(prompt_end)"
}

# need to remove defined functions

Clear-Variable e
Clear-Variable reset