#requires -version 3.0
 
#### Check for updates
#### Version 1.1
#### Last updated 2013-11-18
#### The cononical version of this script is at http://tallguyracing.com/wiki/doku.php?id=powershell_check_for_updates
 
$appsToCheck = ('TrueCrypt', 'Anki', 'ConEmu', 'Paint.NET', 'Rockbox', 'DokuWiki', 'GIMP', '7zip', 'WinMerge', 'Foobar2000', 'Fiddler', 'Process Explorer', 'Process Monitor', 'Notepad++', 'VLC', 'FileZilla', 'ImageMagick', 'TortoiseSVN')
 
$versionNumbers = @{
          'TrueCrypt' = '7.1a'
        ; 'Anki'      = '2.0.18'
        ; 'ConEmu'    = '131117'
        ; 'Paint.NET' = '3.5.11'
        ; 'Rockbox'   = '3.13'
        ; 'DokuWiki'  = '2013-05-10'
        ; 'Notepad++' = '6.5.1'         # Hopefully, this can be reverted to a fully automatic check in the future.
}
 
function GetVersionNumberFromWeb ($appName, $url, $regexPattern)
{
    $response = Invoke-WebRequest -Uri $url
 
    if ($response.StatusCode -ne 200)
    {
        Write-Host "FAILED: ${appName}: Could not get the web page." -ForegroundColor Red
        Write-Host "        ${response.StatusCode}: ${response.StatusDescription}" -ForegroundColor Red
        return
    }
 
    $versionNumberMatches = ([regex]$regexPattern).matches($response.Content)
 
    if ($versionNumberMatches.Count -eq 0)
    {
        Write-Host "FAILED: ${appName}: Could not get version number from the web page. Nothing matched the regex." -ForegroundColor Red
        return
    }
    if ($versionNumberMatches.Count -ne 1)
    {
        Write-Host "FAILED: ${appName}: Could not get version number from the web page. The regex had more than one match." -ForegroundColor Red
        return
    }
    if (! $versionNumberMatches[0].Success)
    {
        Write-Host "FAILED: ${appName}: Could not get version number from the web page. The regex match was not successful." -ForegroundColor Red
        return
    }
    if (! $versionNumberMatches[0].Groups["versionNumber"].Success)
    {
        Write-Host "FAILED: ${appName}: Could not get version number from the web page. The regex group was not successful." -ForegroundColor Red
        return
    }
 
    $latestVersionNumber = $versionNumberMatches[0].Groups["versionNumber"].Value
    Write-Host "${appName}: The latest version number is $LatestVersionNumber."
 
    return $latestVersionNumber
}
 
 
function CheckLocalFile ($appName, $url, $regexPattern, $localFilename, $extraFormatting)
{
    $appInfo = Get-Command $localFilename
    $currentVersionNumber = $appInfo.FileVersionInfo.ProductVersion
 
    if ($extraFormatting.Contains(';CommaToFullStop;'))
    {
        $currentVersionNumber = $currentVersionNumber.Replace(',', '.')
    }
    if ($extraFormatting.Contains(';RemoveSpaces;'))
    {
        $currentVersionNumber = $currentVersionNumber.Replace(' ', '')
    }
    if ($extraFormatting.Contains(';TrimTrailingDotZero;') -and $currentVersionNumber.EndsWith('.0'))
    {
        $currentVersionNumber = $currentVersionNumber.Substring(0, $currentVersionNumber.Length - 2)
    }
    if ($extraFormatting.Contains(';FirstThreeDigitsOnly;'))
    {
        if (! ($currentVersionNumber -match "\d+(?:\.\d+){2}"))
        {
            Write-Host "FAILED: ${appName}: Could not get the first three digits of the version number from '$currentVersionNumber'." -ForegroundColor Red
            return
        }
        $currentVersionNumber = $Matches.Values
    }
 
    CheckCurrentVersionNumber $appName $url $regexPattern $currentVersionNumber
}
 
function CheckCurrentVersionNumber ($appName, $url, $regexPattern, $currentVersionNumber)
{
    $latestVersionNumber = GetVersionNumberFromWeb $appName $url $regexPattern
    if (! $latestVersionNumber)
    {
        return
    }
 
 
    Write-Host "${appName}: The current version number is $currentVersionNumber."
 
    if ($currentVersionNumber -ne $latestVersionNumber)
    {
        Write-Host "${appName}: Update required!" -ForegroundColor Green
    }
    else
    {
        Write-Host "${appName}: No update required."
    }
}
 
function CheckAppCurrentVersionNumber ($appName)
{
    switch ($appName)
    {
        #### Semi-automatic checks ####
        'TrueCrypt'
        {
            CheckCurrentVersionNumber 'TrueCrypt' 'http://www.truecrypt.org/downloads' `
                '\>Latest Stable Version - (?<versionNumber>\d+\.\d+\w+)\<' `
                $versionNumbers['TrueCrypt']
        }
        'Anki'
        {
            CheckCurrentVersionNumber 'Anki' 'http://ankisrs.net/' `
                'href="http://ankisrs\.net/download/mirror/anki-(?<versionNumber>\d+(?:\.\d+){2})\.exe"' `
                $versionNumbers['Anki']
        }
        'ConEmu'
        {
            CheckCurrentVersionNumber 'ConEmu' 'http://conemu.codeplex.com/' `
                'ConEmu (?<versionNumber>\d+\w+) \[Alpha\]' `
                $versionNumbers['ConEmu']
        }
        'Paint.NET'
        {
            CheckCurrentVersionNumber 'Paint.NET' 'http://www.getpaint.net/index.html' `
                '>Paint\.NET\s*v(?<versionNumber>\d+(?:\.\d+){2})<' `
                $versionNumbers['Paint.NET']
        }
        'Rockbox'
        {
            CheckCurrentVersionNumber 'Rockbox' 'http://www.rockbox.org/download/' `
                '<h1>Rockbox (?<versionNumber>\d+(?:\.\d+){1,2}) Download</h1>' `
                $versionNumbers['Rockbox']
        }
        'DokuWiki'
        {
            CheckCurrentVersionNumber 'DokuWiki' 'http://download.dokuwiki.org/' `
                '<a href="src/dokuwiki/dokuwiki-stable\.tgz">\(direct link\)</a>\s*<span class="hint">(?<versionNumber>\d{4}-\d{2}-\d{2}).+?</span>' `
                $versionNumbers['DokuWiki']
        }
        'Notepad++'
        {
            CheckCurrentVersionNumber 'Notepad++' 'http://notepad-plus-plus.org/download/' `
                '<title>Notepad\+\+ v(?<versionNumber>\d+(?:\.\d+){1,2}) - Current Version</title>' `
                $versionNumbers['Notepad++']
        }
        #### Fully-automatic checks ####
        'GIMP'
        {
            CheckLocalFile 'GIMP' 'http://www.gimp.org/downloads/' `
                'href="http://ftp\.gimp\.org/pub/gimp/[^/]+/windows/gimp-(?<versionNumber>\d+(?:\.\d+){2})-setup.exe"' `
                'C:\Program Files\GIMP 2\bin\gimp-2.8.exe' ''
        }
        '7zip'
        {
            CheckLocalFile '7zip' 'http://www.7-zip.org/' `
                'Download 7-Zip (?<versionNumber>\d+(?:\.\d+){1,2}) \(\d+-\d+-\d+\) for Windows' `
                'C:\Program Files (x86)\7-Zip\7z.exe' ''
        }
        'WinMerge'
        {
            CheckLocalFile 'WinMerge' 'http://winmerge.org/' `
                'href="http://downloads.sourceforge.net/winmerge/WinMerge-(?<versionNumber>\d+(?:\.\d+){2})-Setup.exe"' `
                'C:\Program Files (x86)\WinMerge\WinMergeU.exe' ''
        }
        'Foobar2000'
        {
            CheckLocalFile 'Foobar2000' 'http://www.foobar2000.org/download' `
                'href="/getfile/[^/]+/foobar2000_v(?<versionNumber>\d+(?:\.\d+){2}).exe">foobar2000 v\d+(?:\.\d+){2}' `
                'C:\Program Files (x86)\foobar2000\foobar2000.exe' `
                ';TrimTrailingDotZero;'
        }
        'Fiddler'
        {
            CheckLocalFile 'Fiddler' 'http://fiddler2.com/get-fiddler' `
                '\<p id="Content_C014_ctl00_ctl00_BottomContentTag"\>Version (?<versionNumber>\d+(?:\.\d+){2,3})\</p\>' `
                'C:\Program Files (x86)\Fiddler2\fiddler.exe' ''
        }
        'Process Explorer'
        {
            CheckLocalFile 'Process Explorer' 'http://technet.microsoft.com/en-US/sysinternals/bb896653' `
                '<h1>Process Explorer v(?<versionNumber>\d+\.\d+)</h1>' `
                'C:\Program Files (x86)\ProcessExplorer\procexp.exe' ''
        }
        'Process Monitor'
        {
            CheckLocalFile 'Process Monitor' 'http://technet.microsoft.com/en-US/sysinternals/bb896645' `
                '<h1>Process Monitor v(?<versionNumber>\d+\.\d+)</h1>' `
                'C:\Program Files (x86)\ProcessMonitor\procmon.exe' ''
        }
#       Next time the version changes, try using this rather than the Semi-automatic check.
#        'Notepad++'
#        {
#            CheckLocalFile 'Notepad++' 'http://notepad-plus-plus.org/download/' `
#                '<title>Notepad\+\+ v(?<versionNumber>\d+(?:\.\d+){1,2}) - Current Version</title>' `
#                'C:\Program Files (x86)\Notepad++\notepad++.exe' ''
#        }
        'VLC'
        {
            CheckLocalFile 'VLC' 'http://videolan.org/vlc/' `
                'href=''//get.videolan.org/vlc/(?:\d+(?:\.\d+){2})/win32/vlc-(?<versionNumber>\d+(?:\.\d+){2})-win32.exe''>' `
                'C:\Program Files (x86)\VideoLAN\VLC\vlc.exe' `
                ';CommaToFullStop;TrimTrailingDotZero;'
        }
        'FileZilla'
        {
            CheckLocalFile 'FileZilla' 'http://filezilla-project.org/download.php?type=client' `
                '>The latest stable version of FileZilla Client is (?<versionNumber>\d+(?:\.\d+){2})<' `
                'C:\Program Files (x86)\FileZilla FTP Client\filezilla.exe' `
                ';CommaToFullStop;RemoveSpaces;TrimTrailingDotZero;'
        }
        'ImageMagick'
        {
            CheckLocalFile 'ImageMagick' 'http://www.imagemagick.org/script/binary-releases.php' `
                '>ImageMagick-(?<versionNumber>\d+(?:\.\d+){2})(?:-\d+)?-Q16-x64-dll\.exe<' `
                'C:\Program Files\ImageMagick\mogrify.exe' ''
        }
        'TortoiseSVN'
        {
            CheckLocalFile 'TortoiseSVN' 'http://tortoisesvn.net/downloads.html' `
                '>The current version is (?<versionNumber>\d+(?:\.\d+){2})<' `
                'C:\Program Files\TortoiseSVN\bin\TortoiseSVN.dll' `
                ';FirstThreeDigitsOnly;'
        }
        default
        {
            Write-Host "FAILED: ${appName}: Unknown app." -ForegroundColor Red
        }
    }
}
 
 
foreach ($appName in $AppsToCheck) { CheckAppCurrentVersionNumber ($appName) }
 
Write-Host "Press any key to exit."
$null = $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")