Sync eng/common directory with azure-sdk-tools repository

eng/common/Update-Change-Log.ps1

@@ -27,10 +27,10 @@ function Get-ChangelogPath($Path)
 { 
    # Check if CHANGELOG.md is present in path 
    $ChangeLogPath = Join-Path -Path $Path -ChildPath "CHANGELOG.md"
-   if ((Test-Path -Path $ChangeLogPath) -eq $False){
+   if ((Test-Path -Path $ChangeLogPath) -eq $False) {
       # Check if change log exists with name HISTORY.md
       $ChangeLogPath = Join-Path -Path $Path -ChildPath "HISTORY.md"
-      if ((Test-Path -Path $ChangeLogPath) -eq $False){
+      if ((Test-Path -Path $ChangeLogPath) -eq $False) {
          Write-Host "Change log is not found in path[$Path]"
          exit(1)
       }
@@ -45,7 +45,7 @@ function Get-VersionTitle($Version, $Unreleased)
 {
    # Generate version title
    $newVersionTitle = "## $Version $UNRELEASED_TAG"
-   if ($Unreleased -eq $False){
+   if ($Unreleased -eq $False) {
       $releaseDate = Get-Date -Format "(yyyy-MM-dd)"
       $newVersionTitle = "## $Version $releaseDate"
    }
@@ -67,10 +67,10 @@ function Get-NewChangeLog( [System.Collections.ArrayList]$ChangelogLines, $Versi
    # Version increment tool passes replaceversion as False and Unreleased as True
    $is_version_increment = $ReplaceVersion -eq $False -and $Unreleased -eq $True
 
-   for(; $Index -lt $ChangelogLines.Count; $Index++){
-      if (Version-Matches($ChangelogLines[$Index])){
+   for (; $Index -lt $ChangelogLines.Count; $Index++) {
+      if (Version-Matches($ChangelogLines[$Index])) {
          # Find current title in change log
-         if( -not $CurrentTitle){
+         if( -not $CurrentTitle) {
             $CurrentTitle = $ChangelogLines[$Index]
             $CurrentIndex = $Index
             Write-Host "Current Version title: $CurrentTitle"
@@ -80,7 +80,7 @@ function Get-NewChangeLog( [System.Collections.ArrayList]$ChangelogLines, $Versi
          # update change log script is triggered for all packages with current version for Java ( or any language where version is maintained in common file)
          # and this can cause an issue if someone changes changelog manually to prepare for release without updating actual version in central version file
          # Do not add new line or replace existing title when version is already present and script is triggered to add new line
-         if ($is_version_increment -and $ChangelogLines[$Index].Contains($Version)){
+         if ($is_version_increment -and $ChangelogLines[$Index].Contains($Version)) {
             Write-Host "Version is already present in change log."
             exit(0)
          }
@@ -90,26 +90,24 @@ function Get-NewChangeLog( [System.Collections.ArrayList]$ChangelogLines, $Versi
    # Generate version title
    $newVersionTitle = Get-VersionTitle -Version $Version -Unreleased $Unreleased
 
-   if( $newVersionTitle -eq $CurrentTitle){
+   if( $newVersionTitle -eq $CurrentTitle) {
       Write-Host "No change is required in change log. Version is already present."
       exit(0)
    }
 
-
-
-   if (($ReplaceVersion -eq $True) -and ($Unreleased -eq $False) -and (-not $CurrentTitle.Contains($UNRELEASED_TAG))){
+   if (($ReplaceVersion -eq $True) -and ($Unreleased -eq $False) -and $CurrentTitle.Contains($version) -and (-not $CurrentTitle.Contains($UNRELEASED_TAG))) {
       Write-Host "Version is already present in change log with a release date."
       exit(0)
    }
 
    # if current version title already has new version then we should replace title to update it
-   if ($CurrentTitle.Contains($Version) -and $ReplaceVersion -eq $False){
+   if ($CurrentTitle.Contains($Version) -and $ReplaceVersion -eq $False) {
       Write-Host "Version is already present in title. Updating version title"
       $ReplaceVersion = $True
    }
 
    # if version is already found and not replacing then nothing to do
-   if ($ReplaceVersion -eq $False){
+   if ($ReplaceVersion -eq $False) {
       Write-Host "Adding version title $newVersionTitle"
       $ChangelogLines.insert($CurrentIndex, "")
       $ChangelogLines.insert($CurrentIndex, "")
@@ -121,24 +119,28 @@ function Get-NewChangeLog( [System.Collections.ArrayList]$ChangelogLines, $Versi
       $ChangelogLines[$CurrentIndex] = $newVersionTitle
    }
 
-   return $ChangelogLines      
+   return $ChangelogLines
 }
 
 
 # Make sure path is valid
-if ((Test-Path -Path $ChangeLogPath) -eq $False){
+if ((Test-Path -Path $ChangeLogPath) -eq $False) {
    Write-Host "Change log path is invalid. [$ChangeLogPath]"
    exit(1)
 }
 
 # probe change log path if path is directory 
-if (Test-Path -Path $ChangeLogPath -PathType Container)
-{   
+if (Test-Path -Path $ChangeLogPath -PathType Container) {
    $ChangeLogPath = Get-ChangelogPath -Path $ChangeLogPath
 }
 
 # Read current change logs and add/update version
 $ChangelogLines = [System.Collections.ArrayList](Get-Content -Path $ChangeLogPath)
+
+if ($null -eq $ChangelogLines) { 
+   $ChangelogLines = @() 
+}
+
 $NewContents = Get-NewChangeLog -ChangelogLines $ChangelogLines -Version $Version -Unreleased $Unreleased -ReplaceVersion $ReplaceVersion
 
 Write-Host "Writing change log to file [$ChangeLogPath]"