chocolateyInstall.ps1

try {
  $registryKeyName = 'Git_is1'
  $packageId = 'git.install'
  $fileType = 'exe'
  $fileArgs = $(
    '/VERYSILENT /NORESTART /NOCANCEL /SP- ' +
    '/NOICONS /COMPONENTS="icons,icons\quicklaunch,ext,ext\reg,ext\reg\shellhere,ext\reg\guihere,assoc,assoc_sh" /LOG'
  )
  $url = 'https://github.com/msysgit/msysgit/releases/download/Git-1.9.5-preview20141217/Git-1.9.5-preview20141217.exe'

  $arguments = @{};
  # /GitOnlyOnPath /GitAndUnixToolsOnPath /NoAutoCrlf
  $packageParameters = $env:chocolateyPackageParameters;

  # Default the values
  $gitCmdOnly = $false
  $unixTools = $false
  $noAutoCrlf = $false # this does nothing unless true

  # Now parse the packageParameters using good old regular expression
  if ($packageParameters) {
      $match_pattern = "\/(?<option>([a-zA-Z]+)):(?<value>([`"'])?([a-zA-Z0-9- _\\:\.]+)([`"'])?)|\/(?<option>([a-zA-Z]+))"
      $option_name = 'option'
      $value_name = 'value'

      if ($packageParameters -match $match_pattern ){
          $results = $packageParameters | Select-String $match_pattern -AllMatches
          $results.matches | % {
            $arguments.Add(
                $_.Groups[$option_name].Value.Trim(),
                $_.Groups[$value_name].Value.Trim())
        }
      }
      else
      {
        throw "Package Parameters were found but were invalid (REGEX Failure)"
      }

      if ($arguments.ContainsKey("GitOnlyOnPath")) {
          Write-Host "You want Git on the command line"
          $gitCmdOnly = $true
      }

      if ($arguments.ContainsKey("GitAndUnixToolsOnPath")) {
          Write-Host "You want Git and Unix Tools on the command line"
          $unixTools = $true
      }

      if ($arguments.ContainsKey("NoAutoCrlf")) {
          Write-Host "Ensuring core.autocrlf is false on first time install only"
          Write-Host " This setting will not adjust an already existing .gitconfig setting."
          $noAutoCrlf = $true
      }
  } else {
      Write-Debug "No Package Parameters Passed in";
  }

  $is64bit = (Get-ProcessorBits) -eq 64

  # there is only a 32-bit version, so we don't need to do any further testing on the two keys
  $installKey = "HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\$registryKeyName"
  if ($is64bit -eq $false) {
    $installKey = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$registryKeyName"
  }

  $userInstallKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\$registryKeyName"
  if (Test-Path $userInstallKey) {
    $installKey = $userInstallKey
  }

  if ( -not (Test-Path $installKey)) {
    New-Item -Path $installKey | Out-Null
  }

  if ($gitCmdOnly) {
    # update registry so installer picks it up automatically
    New-ItemProperty $installKey -Name "Inno Setup CodeFile: Path Option" -Value "Cmd" -PropertyType "String" -Force | Out-Null
  }

  if ($unixTools) {
    # update registry so installer picks it up automatically
    New-ItemProperty $installKey -Name "Inno Setup CodeFile: Path Option" -Value "CmdTools" -PropertyType "String" -Force | Out-Null
  }

  if ($noAutoCrlf) {
    # update registry so installer picks it up automatically
    New-ItemProperty $installKey -Name "Inno Setup CodeFile: CRLF Option" -Value "CRLFCommitAsIs" -PropertyType "String" -Force | Out-Null
  }

  Install-ChocolateyPackage $packageId $fileType $fileArgs $url

  $keyNames = Get-ItemProperty -Path $installKey

  if ($gitCmdOnly -eq $false -and $unixTools -eq $false) {
    $installLocation = $keyNames.InstallLocation
    if ($installLocation -ne '') {
      $gitPath = Join-Path $installLocation 'cmd'
      Install-ChocolateyPath $gitPath 'Machine'
    }
  }

  Write-Warning "Git installed - You may need to close and reopen your shell for PATH changes to take effect."
} catch {
  Write-ChocolateyFailure $packageId $($_.Exception.Message)
  throw
}