RosettaCodeData/Task/Update-a-configuration-file/PowerShell/update-a-configuration-file...

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function Update-ConfigurationFile
{
[CmdletBinding()]
Param
(
[Parameter(Mandatory=$false,
Position=0)]
[ValidateScript({Test-Path $_})]
[string]
$Path = ".\config.txt",
[Parameter(Mandatory=$false)]
[string]
$FavouriteFruit,
[Parameter(Mandatory=$false)]
[int]
$NumberOfBananas,
[Parameter(Mandatory=$false)]
[int]
$NumberOfStrawberries,
[Parameter(Mandatory=$false)]
[ValidateSet("On", "Off")]
[string]
$NeedsPeeling,
[Parameter(Mandatory=$false)]
[ValidateSet("On", "Off")]
[string]
$SeedsRemoved
)
[string[]]$lines = Get-Content $Path
Clear-Content $Path
if (-not ($lines | Select-String -Pattern "^\s*NumberOfStrawberries" -Quiet))
{
"", "# How many strawberries we have", "NumberOfStrawberries 0" | ForEach-Object {$lines += $_}
}
foreach ($line in $lines)
{
$line = $line -replace "^\s*","" ## Strip leading whitespace
if ($line -match "[;].*\s*") {continue} ## Strip semicolons
switch -Regex ($line)
{
"(^$)|(^#\s.*)" ## Blank line or comment
{
$line = $line
}
"^FavouriteFruit\s*.*" ## Parameter FavouriteFruit
{
if ($FavouriteFruit)
{
$line = "FAVOURITEFRUIT $FavouriteFruit"
}
}
"^NumberOfBananas\s*.*" ## Parameter NumberOfBananas
{
if ($NumberOfBananas)
{
$line = "NUMBEROFBANANAS $NumberOfBananas"
}
}
"^NumberOfStrawberries\s*.*" ## Parameter NumberOfStrawberries
{
if ($NumberOfStrawberries)
{
$line = "NUMBEROFSTRAWBERRIES $NumberOfStrawberries"
}
}
".*NeedsPeeling\s*.*" ## Parameter NeedsPeeling
{
if ($NeedsPeeling -eq "On")
{
$line = "NEEDSPEELING"
}
elseif ($NeedsPeeling -eq "Off")
{
$line = "; NEEDSPEELING"
}
}
".*SeedsRemoved\s*.*" ## Parameter SeedsRemoved
{
if ($SeedsRemoved -eq "On")
{
$line = "SEEDSREMOVED"
}
elseif ($SeedsRemoved -eq "Off")
{
$line = "; SEEDSREMOVED"
}
}
Default ## Whatever...
{
$line = $line
}
}
Add-Content $Path -Value $line -Force
}
}