The SVN generates a diff file for the latest or a specified revision, making it convenient to apply the patch using svn apply. (svn生成最新版本号或者指定版本号的diff文件, 以便于svn apply patch)

Generate-SvnDiff.ps1

# Requires Subversion command-line tool (svn.exe) to be installed
# Working directory must be the root of an SVN working copy
param (
    [int]$Revision
)

# Ensure the current directory is the root of the SVN working copy
try {
    # 1. Perform SVN update
    $updateResult = svn update 2>&1
    if ($LASTEXITCODE -ne 0) {
        throw "SVN update failed: $($updateResult -join "`n")"
    }
    Write-Host "SVN update successful" -ForegroundColor Green

    # 2. Get the latest revision number (if not provided)
    if (-not $Revision) {
        $log = svn log -l 1 2>&1
        if ($LASTEXITCODE -ne 0) {
            throw "Failed to retrieve SVN log: $($log -join "`n")"
        }

        # Safely extract revision number: match the first line
        $log -split "`n" | ForEach-Object {
            if (-not $Revision -and $_ -match '^r(?<rev>\d+)') {
                $Revision = [int]$matches['rev']
            }
        }

        if ($Revision) {
            Write-Host "Detected latest revision: $Revision" -ForegroundColor Cyan
        } else {
            throw "No valid revision number found"
        }
    } else {
        Write-Host "Using specified revision: $Revision" -ForegroundColor Cyan
    }

    # 3. Generate diff file
    $diffFile = "diff_$Revision.diff"

    Start-Process -NoNewWindow -FilePath "svn" -ArgumentList "diff", "-c", $Revision `
        -RedirectStandardOutput $diffFile -Wait

    if (Test-Path $diffFile) {
        Write-Host "Diff file generated: $diffFile" -ForegroundColor Green
        Invoke-Item $diffFile
    } else {
        throw "Failed to generate diff file"
    }
}
catch {
    Write-Host "Error: $_" -ForegroundColor Red
    exit 1
}