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Get-Comparison.ps1
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Get-Comparison.ps1
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function Get-Comparison {
<#
.SYNOPSIS
Compares two CSV files for differences and exports the result in a new CSV file.
.DESCRIPTION
Compares two CSV files for differences and exports the result in a new CSV file.
The output file will be saved in the folder specified in the -OutputFolder parameter, and will contain the two compared filenames.
.PARAMETER ReferenceObject
The first CSV file to compare.
.PARAMETER DifferenceObject
The second CSV file to compare.
.PARAMETER Compare
The properties to compare. Use the format "One", "Two", "Three", etc.
.PARAMETER OutputFolder
The folder where the output file will be saved. Do NOT include the trailing backslash (\)
.EXAMPLE
Get-Comparison -ReferenceObject "C:\baseline.csv" -DifferenceObject "C:\new_check.csv" -Compare "One", "Two", "Three" -OutputFolder "C:\output"
.NOTES
Updated: 2024-06-28
Contributing Authors:
Anthony Phipps
LEGAL: Copyright (C) 2024
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
.LINK
https://github.com/TonyPhipps/Powershell
#>
[CmdletBinding()]
param(
[Parameter(mandatory=$true)]
[ValidateScript({
try {
Get-Item $_ -ErrorAction Stop
} catch [System.Management.Automation.ItemNotFoundException] {
Throw [System.Management.Automation.ItemNotFoundException] "${_} Maybe there are network issues?"
}
})]
[String]$ReferenceObject,
[Parameter(mandatory=$true)]
[ValidateScript({
try {
Get-Item $_ -ErrorAction Stop
} catch [System.Management.Automation.ItemNotFoundException] {
Throw [System.Management.Automation.ItemNotFoundException] "${_} Maybe there are network issues?"
}
})]
[String]$DifferenceObject,
[Parameter()]
[Array]$Compare,
[Parameter()]
[String]$OutputFolder = "$DifferenceObject\Difference"
)
begin{
$ReferenceObjects = Import-Csv $ReferenceObject
$DifferenceObjects = Import-Csv $DifferenceObject
if ([Collections.Generic.SortedSet[String]]::CreateSetComparer().Equals($ReferenceObjects,$DifferenceObjects)){ # Objects are the same / both blank
Write-Information -InformationAction Continue -MessageData ("Reference object matches Difference object. Skipping.")
continue
}
if (!$ReferenceObject -OR !$ReferenceObjects){ # ReferenceObject is blank
Write-Information -InformationAction Continue -MessageData ("Reference object blank or doesn't exist for: `n`t{0}`n`tCopying the DifferenceObject to represent differences." -f $DifferenceObject)
$Output = "{0}\NO_REFERENCE_OBJECT_OR_CONTENT_FOR_{1}.csv" -f $OutputFolder, (Split-Path $DifferenceObject -Leaf).split('\.')[-2]
Copy-Item $DifferenceObject $Output
continue
}
if (!$DifferenceObject -OR !$DifferenceObjects){ # DifferenceObject is blank
Write-Information -InformationAction Continue -MessageData ("Difference object blank or doesn't exist for: `n`t{0}`n`tCopying the ReferenceObject to represent differences." -f $ReferenceObject)
$Output = "{0}\{1}_HAS_NO_DIFFERENCE_OBJECT_OR_CONTENT.csv" -f $OutputFolder, (Split-Path $ReferenceObject -Leaf).split('\.')[-2]
Copy-Item $ReferenceObject $Output
continue
}
}
process{
New-Item -Path (Split-Path $OutputFolder -Parent) -Name (Split-Path $OutputFolder -Leaf) -ItemType "Directory" -ErrorAction SilentlyContinue
$Output = "{0}\{1}_vs_{2}_difference.csv" -f $OutputFolder, (Split-Path $ReferenceObject -Leaf), (Split-Path $DifferenceObject -Leaf)
$ReferenceObjects = Import-Csv $ReferenceObject
$DifferenceObjects = Import-Csv $DifferenceObject
$UniqueObjects = Compare-Object -ReferenceObject $ReferenceObjects -DifferenceObject $DifferenceObjects -Property $Compare -PassThru |
Where-Object { $_.SideIndicator -eq '<=' -or $_.SideIndicator -eq '=>' }
foreach ($UniqueObject in $UniqueObjects) {
if ($UniqueObject.SideIndicator -eq "<="){
$UniqueObject | Add-Member -MemberType NoteProperty -Name "File" -Value $ReferenceObject
}
if ($UniqueObject.SideIndicator -eq "=>"){
$UniqueObject | Add-Member -MemberType NoteProperty -Name "File" -Value $DifferenceObject
}
$UniqueObject | Add-Member -MemberType NoteProperty -Name "ComparedProperties" -Value ($Compare -join ", ")
}
Write-Information -InformationAction Continue -MessageData ("Found {0} unique objects." -f $UniqueObjects.count)
if ($UniqueObjects.count -gt 0) {
Write-Information -InformationAction Continue -MessageData ("Saving output to {0}" -f $Output)
$UniqueObjects | Export-Csv $Output -NoTypeInformation
}
}
end{
}
}