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SelectFunctions.ps1
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158 lines (118 loc) · 4.37 KB
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Function Select-First {
[CmdletBinding(DefaultParameterSetName = 'DefaultParameter')]
[Alias("First")]
param(
[Parameter(
ParameterSetName = 'DefaultParameter',
Mandatory,
ValueFromPipeline )]
[psobject]$InputObject,
[Parameter(
ParameterSetName = 'DefaultParameter',
Position = 0,
Mandatory,
HelpMessage = "How many items do you want to select?")]
[ValidateRange(0, 2147483647)]
[int]$First,
[Parameter(
Position = 1,
ParameterSetName = 'DefaultParameter')]
[ValidateNotNullOrEmpty()]
[string]$Property,
[Parameter(ParameterSetName = 'DefaultParameter')]
[ValidateRange(0, 2147483647)]
[int]$Skip = 0,
[Parameter(ParameterSetName = 'DefaultParameter')]
[switch]$Descending
)
Begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
Write-Verbose "[BEGIN ] Using parameter set $($PSCmdlet.ParameterSetName)"
if ($PSBoundParameters.ContainsKey("Property")) {
$sortParams = @{Property = $Property}
write-verbose "Sorting on $Property"
}
if ($PSBoundParameters.ContainsKey("Descending")) {
if ($sortParams) {
$sortParams.Add("Descending", $True)
}
else {
#it is possible to sort without a property say on a string or number
$sortParams = @{"Descending" = $True}
}
}
$data = @()
Write-Verbose "Selecting first $First, skipping $skip."
} #begin
Process {
#save input objects so they can be sorted
$data += $InputObject
} #process
End {
If ($sortparams) {
Write-Verbose ($sortParams | out-string)
$data = $data | Sort-Object @sortparams
}
$data | Microsoft.PowerShell.Utility\Select-object -First $first -Skip $skip
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
} #end function Select-First
Function Select-Last {
[CmdletBinding(DefaultParameterSetName = 'DefaultParameter')]
[Alias("Last")]
param(
[Parameter(
ParameterSetName = 'DefaultParameter',
Mandatory,
ValueFromPipeline )]
[psobject]$InputObject,
[Parameter(
ParameterSetName = 'DefaultParameter',
Position = 0,
Mandatory,
HelpMessage = "How many items do you want to select?")]
[ValidateRange(0, 2147483647)]
[int]$Last,
[Parameter(
Position = 1,
ParameterSetName = 'DefaultParameter')]
[ValidateNotNullOrEmpty()]
[string]$Property,
[Parameter(ParameterSetName = 'DefaultParameter')]
[ValidateRange(0, 2147483647)]
[int]$Skip = 0,
[Parameter(ParameterSetName = 'DefaultParameter')]
[switch]$Descending
)
Begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
Write-Verbose "[BEGIN ] Using parameter set $($PSCmdlet.ParameterSetName)"
if ($PSBoundParameters.ContainsKey("Property")) {
$sortParams = @{Property = $Property}
write-verbose "Sorting on $Property"
}
if ($PSBoundParameters.ContainsKey("Descending")) {
if ($sortParams) {
$sortParams.Add("Descending", $True)
}
else {
#it is possible to sort without a property say on a string or number
$sortParams = @{"Descending" = $True}
}
}
$data = @()
Write-Verbose "Selecting Last $Last, skipping $skip."
} #begin
Process {
#save input objects so they can be sorted
$data += $InputObject
} #process
End {
If ($sortparams) {
Write-Verbose ($sortParams | out-string)
$data = $data | Sort-Object @sortparams
}
$data | Microsoft.PowerShell.Utility\Select-object -Last $Last -Skip $skip
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
} #end function Select-Last