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SelectFunctions.ps1
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312 lines (252 loc) · 9.42 KB
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Function Select-First {
[CmdletBinding()]
[Alias("First")]
param(
[Parameter(Mandatory, ValueFromPipeline)]
[psobject]$InputObject,
[Parameter(Position = 0, Mandatory, HelpMessage = "How many items do you want to select?")]
[ValidateRange(0, 2147483647)]
[int]$First,
[Parameter(Position = 1, HelpMessage = "Select a property to sort on before selecting the first number of objects.")]
[ValidateNotNullOrEmpty()]
[string]$Property,
[Parameter()]
[ValidateRange(0, 2147483647)]
[int]$Skip = 0,
[Parameter()]
[switch]$Descending
)
Begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
if ($PSBoundParameters.ContainsKey("Property")) {
$sortParams = @{Property = $Property }
Write-Verbose "[BEGIN ] 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 = [System.Collections.generic.list[object]]::new()
Write-Verbose "[BEGIN ] Selecting first $First, skipping $skip."
} #begin
Process {
#save input objects so they can be sorted
if ($data.count -eq 0) {
Write-Verbose "[PROCESS] Processing input"
}
#verify property
if ($property -AND $InputObject.psobject.properties.name -notcontains $property) {
$exception = [system.argumentexception]::new("Cannot find property $property on the inputobject.")
Throw $exception
}
else {
$data.add($InputObject)
}
} #process
End {
If ($sortparams) {
Write-Verbose "[END ] Sort parameters"
Write-Verbose ($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()]
[Alias("Last")]
param(
[Parameter(Mandatory, ValueFromPipeline )]
[psobject]$InputObject,
[Parameter(Position = 0, Mandatory, HelpMessage = "How many items do you want to select?")]
[ValidateRange(0, 2147483647)]
[int]$Last,
[Parameter(Position = 1, HelpMessage = "Sort on this property and then select the last number of items")]
[ValidateNotNullOrEmpty()]
[string]$Property,
[Parameter()]
[ValidateRange(0, 2147483647)]
[int]$Skip = 0,
[Parameter()]
[switch]$Descending
)
Begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
if ($PSBoundParameters.ContainsKey("Property")) {
$sortParams = @{Property = $Property }
Write-Verbose "[BEGIN ] 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 = [System.Collections.generic.list[object]]::new()
Write-Verbose "[BEGIN ] Selecting Last $Last, skipping $skip."
} #begin
Process {
#save input objects so they can be sorted
if ($data.count -eq 0) {
Write-Verbose "[PROCESS] Processing input"
}
#verify property
if ($property -AND $InputObject.psobject.properties.name -notcontains $property) {
$exception = [system.argumentexception]::new("Cannot find property $property on the inputobject.")
Throw $exception
}
else {
$data.add($InputObject)
}
} #process
End {
If ($sortparams) {
Write-Verbose "[END ] Sorting parameters"
Write-Verbose ($sortParams | Out-String)
$data = $data | Sort-Object @sortparams
}
$data | Select-Object -Last $Last -Skip $skip
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
} #end function Select-Last
Function Select-After {
[CmdletBinding()]
[alias("after")]
param(
[Parameter(Mandatory, ValueFromPipeline)]
[psobject]$InputObject,
[Parameter(Position = 0, Mandatory, HelpMessage = "Enter the cutoff date")]
[DateTime]$After,
[Parameter(HelpMessage = "Enter the property name to select on. It needs to be a datetime object.")]
[ValidateNotNullOrEmpty()]
[string]$Property = "LastWriteTime"
)
begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
Write-Verbose "[BEGIN ] Selecting objects after $after based on the $Property property"
} #begin
process {
#verify property
if ($InputObject.psobject.properties.name -notcontains $property) {
$exception = [system.argumentexception]::new("Cannot find property $property on the inputobject.")
Throw $exception
}
else {
$InputObject | Where-Object { $_.$property -ge $After }
}
} #process
end {
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
} #end function
Function Select-Before {
[CmdletBinding()]
[alias("before")]
param(
[Parameter(Mandatory, ValueFromPipeline)]
[psobject]$InputObject,
[Parameter(Position = 0, Mandatory, HelpMessage = "Enter the cutoff date")]
[DateTime]$Before,
[Parameter(HelpMessage = "Enter the property name to select on. It must be a datetime object.")]
[ValidateNotNullOrEmpty()]
[string]$Property = "LastWriteTime"
)
begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
Write-Verbose "[BEGIN ] Selecting objects before $before based on the $Property property"
} #begin
process {
#verify property
if ($InputObject.psobject.properties.name -notcontains $property) {
$exception = [system.argumentexception]::new("Cannot find property $property on the inputobject.")
Throw $exception
}
else {
$InputObject | Where-Object { $_.$property -le $Before }
}
} #process
end {
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
} #end function
function Select-Newest {
[CmdletBinding()]
[alias("newest")]
param(
[Parameter(Mandatory, ValueFromPipeline)]
[psobject]$InputObject,
[Parameter(Position = 0, Mandatory, HelpMessage = "Enter the number of newest items to get")]
[ValidateRange(0, 2147483647)]
[Int]$Newest,
[Parameter(HelpMessage = "Enter the property name to select on. It must be a datetime object.")]
[ValidateNotNullOrEmpty()]
[string]$Property = "LastWriteTime"
)
begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
$data = [System.Collections.generic.list[object]]::new()
} #begin
process {
if ($data.count -eq 0) {
Write-Verbose "[PROCESS] Processing input"
}
#verify property
if ($InputObject.psobject.properties.name -notcontains $property) {
$exception = [system.argumentexception]::new("Cannot find property $property on the inputobject.")
Throw $exception
}
else {
$data.add($InputObject)
}
} #process
end {
Write-Verbose "[END ] Selecting newest $newest object(s) based on $property"
$data | Sort-Object -Property $property -Descending | Select-Object -First $Newest
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
}
function Select-Oldest {
[CmdletBinding()]
[alias("oldest")]
param(
[Parameter(Mandatory, ValueFromPipeline)]
[psobject]$InputObject,
[Parameter(Position = 0, Mandatory, HelpMessage = "Enter the number of Oldest items to get")]
[ValidateRange(0, 2147483647)]
[Int]$Oldest,
[Parameter(HelpMessage = "Enter the property name to select on. It must be a datetime object.")]
[ValidateNotNullOrEmpty()]
[string]$Property = "LastWriteTime"
)
begin {
Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)"
$data = [System.Collections.generic.list[object]]::new()
} #begin
process {
if ($data.count -eq 0) {
Write-Verbose "[PROCESS] Processing input"
}
#verify property
if ($InputObject.psobject.properties.name -notcontains $property) {
$exception = [system.argumentexception]::new("Cannot find property $property on the inputobject.")
Throw $exception
}
else {
$data.add($InputObject)
}
} #process
end {
Write-Verbose "[END ] Selecting oldest $oldest object(s) based on $property"
$data | Sort-Object -Property $property | Select-Object -First $Oldest
Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)"
} #end
}