133 lines
4.9 KiB
PowerShell
133 lines
4.9 KiB
PowerShell
function Compare-File {
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<#
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.SYNOPSIS
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Compares two files, displaying differences in a manner similar to traditional console-based diff utilities.
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#>
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param(
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[Parameter(Mandatory = $true)]
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[ValidateNotNullOrEmpty()]
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$CompareFrom,
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[Parameter(Mandatory = $true)]
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[ValidateNotNullOrEmpty()]
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$CompareTo,
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[switch]$Porcelain
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)
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$CompareFrom = (Resolve-Path $CompareFrom).Path
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$CompareTo = (Resolve-Path $CompareTo).Path
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$totalFormatWidth = 11 # 5 for numbers, 6 for 2x ' : ' as separators
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$screenWidth = Get-ConsoleDisplayWidth
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$fixedWidth = ($screenWidth - ($screenWidth % 2) - $totalFormatWidth) / 2
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$fileHeaderPrint = " "
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$fileHeaderFrom = Select-RightSubstringWithPadLeft -String $CompareFrom -Length $fixedWidth
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$fileHeaderTo = Select-RightSubstringWithPadLeft -String $CompareTo -Length $fixedWidth
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## Get the content from each file
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$contentFrom = Get-Content -Path $CompareFrom
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$contentTo = Get-Content -Path $CompareTo
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## Compare the two files. Get-Content annotates output objects with
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## a 'ReadCount' property that represents the line number in the file
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## that the text came from.
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$comparedLines = Compare-Object -ReferenceObject $contentFrom -DifferenceObject $contentTo -IncludeEqual | Sort-Object { $line.InputObject.ReadCount }
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if ($comparedLines.Count -eq 0) {
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if (!$Porcelain) {
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"$fileHeaderPrint : $fileHeaderFrom : $fileHeaderTo"
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Write-Host "Contents were the same"
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}
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return
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}
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$shortestFileLength = [Math]::Min($contentFrom.Length, $contentTo.Length)
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$lineNumberColor = $PSStyle.ForegroundColor.LightCyan
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$reset = $PSStyle.Reset
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$diffLeftColor = $PSStyle.ForegroundColor.LightRed
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$diffRightColor = $PSStyle.ForegroundColor.Green
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$lineNumber = 0
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$fromResults = @{}
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$toResults = @{}
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$lineNumbers = @()
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foreach ($line in $comparedLines) {
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$lineNumber = $line.InputObject.ReadCount
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if($line.SideIndicator -eq "=>")
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{
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$lineNumbers += $lineNumber
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$lineOperation = "added"
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$fromResults[$lineNumber] = $line.InputObject
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}
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elseif($line.SideIndicator -eq "<=")
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{
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$lineNumbers += $lineNumber
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$lineOperation = "deleted"
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$toResults[$lineNumber] = $line.InputObject
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}
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}
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if ($lineNumbers.Count -gt 0) {
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$lineNumbers = $lineNumbers | Sort-Object | Get-Unique
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$groups = Group-Numbers -Values $lineNumbers
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$printedLineNumbers = @()
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$print = @("$fileHeaderPrint : $fileHeaderFrom : $fileHeaderTo")
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foreach ($group in $groups) {
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$first = $group[0] - 2
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if ($first -lt 0) {
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$first = 0
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}
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$last = $group[-1] + 2
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if ($last -gt $shortestFileLength) {
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$last = $shortestFileLength
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}
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for ($i = $first; $i -lt $last; $i++) {
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# We already wrote the line somewhere else (think overlaps)
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if ($printedLineNumbers -contains $i) {
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continue
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}
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if ($lineNumbers -contains $i) {
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# We need to print this as a difference
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$diffLeftColor = $PSStyle.ForegroundColor.LightRed
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$diffRightColor = $PSStyle.ForegroundColor.Green
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$to = $toResults[$lineNumber]
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$from = $fromResults[$lineNumber]
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} else {
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# This is not a difference line, print it "normally"
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$to = $contentTo[$i]
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$from = $contentFrom[$i]
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$diffLeftColor = $PSStyle.Reset
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$diffRightColor = $PSStyle.Reset
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}
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$lineNumberLead = "$lineNumber".PadLeft(5, ' ')
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$from = "$from".PadRight($fixedWidth," ").Substring(0,$fixedWidth)
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$to = "$to".PadRight($fixedWidth," ").Substring(0,$fixedWidth)
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$print += "$lineNumberColor$("$i".PadLeft(5))$reset : $diffLeftColor$from$reset : $diffRightColor$to$reset"
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$printedLineNumbers += $i
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}
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}
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if ($print.Count -gt 0) {
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$print
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} else {
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}
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}
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$print = @()
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foreach ($lineNumber in $lineNumbers) {
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$lineNumberLead = "$lineNumber".PadLeft(5, ' ')
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$from = $fromResults[$lineNumber]
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$from = "$from".PadRight($fixedWidth," ").Substring(0,$fixedWidth)
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$to = $toResults[$lineNumber]
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$to = "$to".PadRight($fixedWidth," ").Substring(0,$fixedWidth)
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$print += "$($PSStyle.ForegroundColor.LightCyan)$lineNumberLead$($PSStyle.Reset) : $($PSStyle.ForegroundColor.LightRed)$from$($PSStyle.Reset) : $($PSStyle.ForegroundColor.Green)$to$($PSStyle.Reset)"
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}
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if ($print.Count -gt 0) {
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"$fileHeaderPrint : $fileHeaderFrom : $fileHeaderTo"
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$print
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} else {
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}
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} |