Source code for airregvhcmd.ps

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<#
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.SYNOPSIS
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Search a downloaded Australian aircraft registry database for an Australian aircraft registation and if found, return the aircraft manufacturer and model (tab-delimited)

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.DESCRIPTION
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First, create a subdirectory 'VH' in this script's parent folder.

Next, download the Australian aircraft registry database (see links section), unZIP and move the file acrftreg.csv to the 'VH' folder.

Now run this script with an Australian aircraft registration as its only parameter (see examples section).

The script will first look for the specified registration code in column 1 of the acrftreg.csv file.

If a match is found, the manufacturer and model are found in columns 2 and 4.

The script will display a tab-delimited string with the registration, the manufacturer and the aircraft model (<registration><tab><manufacturer><tab><model>).

If the script was started by another PowerShell script, the calling PowerShell script may also read the manufacturer and model from the variables $Manufacturer and $Model, passed on by this script.

If the script was started by a batch file, the calling batch file can use 'FOR /F' on this PowerShell script's screen output to find the manufacturer and model.

Get-Help './AirRegVHCmd.ps1' -Examples will show 2 examples of this script being called by another script.

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.PARAMETER Registration
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A valid Australian aircraft registration, e.g. VH-EYV

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.PARAMETER Quiet
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Ignore all errors and do not display any error messages; in case of errors, just terminate with return code 1.

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.PARAMETER Version
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Show this script's version number; if combined with -Verbose show full script path, version number and last/modified/release date

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.PARAMETER CheckDB
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If the required local database can be found, returns True and exit code 0; if not, returns False and exit code 1.

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.PARAMETER Help
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Show the script's help screen
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.PARAMETER Debug
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Show some progress messages
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.OUTPUTS
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If a match is found: a tab-delimited string with <registration><tab><manufacturer_and_model>, and if -NoBreak switch is used: variables $Manufacturer set to aircraft manufacturer $Model set to aircraft model

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If no match is found: False
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.EXAMPLE
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. ./AirRegVHCmd.ps1 VH-EYV
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Will return tab-delimited string "VH-EYV<tab>THE BOEING COMPANY<tab>A75N1", and set variables $Manufacturer to "THE BOEING COMPANY" and $Model to "A75N1"

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.EXAMPLE
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```
"VH-EYV" | . ./AirRegVHCmd.ps1
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Will also return tab-delimited string "VH-EYV<tab>THE BOEING COMPANY<tab>A75N1", and set variables $Manufacturer to "THE BOEING COMPANY" and $Model to "A75N1"

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.EXAMPLE
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. ./AirRegVHCmd.ps1 "VH-EYV" -Debug
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This will return:
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Start searching "EYV" in acrftreg.csv file at <date> <time>

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Found a match at <date> <time>
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VH-EYV<tab>THE BOEING COMPANY<tab>A75N1
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Finished at <date> <time> (elapsed time <time elapsed>)

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.EXAMPLE
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Create and run the following PowerShell script:

===============================================================

$Registration = 'VH-EYV' ; $Manufacturer = '' ; $Model = ''

[void] ( . "$PSScriptRoot\AirRegVHCmd.ps1" -Registration $Registration )

Write-Host ( "Registration : {0}`nManufacturer : {1}`nModel        : {2}" -f $Registration, $Manufacturer, $Model )

===============================================================

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Besides setting variables $Manufacturer to "THE BOEING COMPANY" and $Model to "A75N1", it will return:

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Registration : VH-EYV
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Manufacturer : THE BOEING COMPANY
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Model        : A75N1
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.EXAMPLE
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Create and run the following batch file:

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REM Note that there should only be a TAB and nothing else between delims= and the doublequote

FOR /F "tokens=1-3 delims=	" %%A IN ('powershell . ./AirRegVHCmd.ps1 VH-EYV') DO (

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	ECHO Registration : %%A
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	ECHO Manufacturer : %%B
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	ECHO Model        : %%C
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)
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===============================================================

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It will return:
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Registration : VH-EYV
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Manufacturer : THE BOEING COMPANY
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Model        : A75N1
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.LINK
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Script written by Rob van der Woude:
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https://www.robvanderwoude.com/
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.LINK
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Australian Civil Aviation Safety Authority aircraft registry database:

https://www.casa.gov.au/aircraft/civil-aircraft-register/aircraft-register-data-files

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.LINK
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Capture -Debug parameter by mklement0 on StackOverflow.com:

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https://stackoverflow.com/a/48643616
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#>
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param (
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	[parameter( ValueFromPipeline )]
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	[ValidatePattern("(^\s*$|[\?/]|^-|^VH-[A-Z]{3}$)")]

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	[string]$Registration,
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	[switch]$CheckDB,
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	[switch]$Version,
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	[switch]$Quiet,
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	[switch]$Help
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)
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$progver = "1.00"
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$Registration = $Registration.ToUpper( )

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$Manufacturer = ''
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$Model = ''
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[bool]$Debug = ( $PSBoundParameters.ContainsKey( 'Debug' ) )

[bool]$Verbose = ( $PSBoundParameters.ContainsKey( 'Verbose' ) )

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if ( $Version ) {
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	if ( $Verbose ) {
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		$lastmod = ( [System.IO.File]::GetLastWriteTime( $PSCommandPath ) )

		if ( $lastmod.ToString( "h.mm" ) -eq $progver ) {

			"`"{0}`", Version {1}, release date {2}" -f $PSCommandPath, $progver, $lastmod.ToString( "yyyy-MM-dd" )

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		} else {
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			# if last modified time is not equal to program version, the script has been tampered with

			"`"{0}`", Version {1}, last modified date {2}" -f $PSCommandPath, $progver, $lastmod.ToString( "yyyy-MM-dd" )

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		}
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	} else {
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		$progver
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	}
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	exit 0
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}
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$dbfolder = ( Join-Path -Path $PSScriptRoot -ChildPath 'VH' )

$dbfile = ( Join-Path -Path $dbfolder -ChildPath 'acrftreg.csv' )

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if ( $CheckDB ) {
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	if ( Test-Path -Path $dbfile -PathType 'Leaf' ) {

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		[bool]$true
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		exit 0
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	} else {
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		[bool]$false
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		exit 1
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	}
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}
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if ( $Help -or [string]::IsNullOrWhiteSpace( $Registration ) -or ( $Registration -match "[/\?]" ) ) {

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	Clear-Host
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	Write-Host ( "`"{0}`", Version {1}" -f $PSCommandPath, $progver ) -NoNewline

	$lastmod = ( [System.IO.File]::GetLastWriteTime( $PSCommandPath ) )

	if ( $lastmod.ToString( "h.mm" ) -eq $progver ) {

		Write-Host ", release date " -NoNewline

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	} else {
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		# if last modified time is not equal to program version, the script has been tampered with

		Write-Host ", last modified date " -NoNewline

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	}
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	Write-Host $lastmod.ToString( "yyyy-MM-dd" )

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	Write-Host
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	Get-Help $PSCommandPath -Full
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	exit -1
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}
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$VH_num = $Registration.Substring( 3 )
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if ( Test-Path -Path $dbfile -PathType 'Leaf' ) {

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	if ( $Debug ) {
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		$StopWatch = [system.diagnostics.stopwatch]::StartNew( )

		Write-Host ( "Start searching `"{0}`" in acrftreg.csv file at {1}" -f $VH_num, ( Get-Date ) )

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	}
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	$pattern = "^`"{0}`",`"[^\n\r]+" -f $VH_num

	$record = ( ( Get-Content -Path $dbfile ) -match $pattern )

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	if ( $record ) {
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		if ( $record.Split( ',' ).Count -gt 3 ) {

			$Manufacturer = $record.Split( ',' )[1] -replace "`"",""

			$Model = $record.Split( ',' )[3] -replace "`"",""

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			if ( $Debug ) {
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				Write-Host ( "Found a match at {0}" -f ( Get-Date ) )

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			}
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		}
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	}
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	"{0}`t{1}`t{2}" -f $Registration, $Manufacturer, $Model | Out-String

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	if ( $Debug ) {
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		Write-Host ( "Finished at {0} (elapsed time {1})`n`n" -f ( Get-Date ), $StopWatch.Elapsed )

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		$StopWatch.Stop( )
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	}
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} else {
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	if ( $Quiet ) {
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		if ( $Debug ) {
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			Write-Host ( "Downloaded Australian aircraft registry database file `"{0}`" not found" -f $dbfile )

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		}
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		exit 1
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	} else {
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		$message = "No downloaded Australian aircraft registry database was found.`n`nDo you want to open the download webpage for the database now?"

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		$title   = 'No Database Found'
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		$buttons = 'YesNo'
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		Add-Type -AssemblyName System.Windows.Forms

		$answer = [System.Windows.Forms.MessageBox]::Show( $message, $title, $buttons )

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		if ( $answer -eq "Yes" ) {
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			$url = 'https://www.casa.gov.au/aircraft/civil-aircraft-register/aircraft-register-data-files'

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			Start-Process $url
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		} else {
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			ShowHelp( 'No downloaded Australian aircraft registry database found, please download it and try again' )

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		}
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	}
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}
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```