61 lines
2.2 KiB
PowerShell
61 lines
2.2 KiB
PowerShell
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function Remove-DuplicateHostsFileRecords {
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<#
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.SYNOPSIS
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Removes duplicate entries from the hostfile, preferring the longest comment in the case of duplicate entries
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Assumes that a distinct record is IpAddress + Hostname
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.PARAMETER Records
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A list of two or more records. An empty array or one that has only one element will be returned as-is.
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A list of records of the format @{ Keep = $false; IpAddress = $null; Hostname = $null; Comment = $null; BlankLine = $false; }
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#>
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[CmdletBinding()]
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[OutputType([object[]])]
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param (
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[Object[]]$Records
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)
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# If we have no records, or only one record, how can we remove duplicates?
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if ((Test-IsCollectionNullOrEmpty $Records) -or ($Records.Count -eq 1)) {
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return $Records
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}
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$hash = @{}
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foreach ($record in $Records) {
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if ([string]::IsNullOrWhiteSpace($record.IpAddress) -and [string]::IsNullOrWhiteSpace($record.Hostname)) {
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continue
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} else {
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$indexString = "$($record.IpAddress)$($record.Hostname)".ToLower()
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$formattedRecord = Format-HostsFileRecord -Record $record
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if ($null -eq $hash[$indexString]) {
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$hash[$indexString] = $formattedRecord
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}
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if ($formattedRecord.Length -gt $hash[$indexString].Length) {
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$hash[$indexString] = $formattedRecord
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}
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}
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}
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$outputRecords = @()
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foreach ($record in $Records) {
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if ([string]::IsNullOrWhiteSpace($record.IpAddress) -and [string]::IsNullOrWhiteSpace($record.Hostname)) {
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$outputRecords += $record
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} else {
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$indexString = "$($record.IpAddress)$($record.Hostname)".ToLower()
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$formattedRecord = Format-HostsFileRecord -Record $record
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# There should have been a record here, so we must have removed it
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if ($null -eq $hash[$indexString]) {
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continue
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}
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if ($formattedRecord.Length -eq $hash[$indexString].Length) {
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$outputRecords += $record
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# Only keep the first one that matches, get rid of all the rest by hitting the above fork
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$hash[$indexString] = $null
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}
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}
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}
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return $outputRecords
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}
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