File: Generate-DocIndex.ps1

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# Generates an index page for cataloging different versions of the Docs
[CmdletBinding()]
Param (
    $DocFx,
    $RepoRoot,
    $DocGenDir
)
. (Join-Path $PSScriptRoot common.ps1)
$GetGithubIoDocIndexFn = "Get-${Language}-GithubIoDocIndex"

# Given the metadata url under https://github.com/Azure/azure-sdk/tree/master/_data/releases/latest, 
# the function will return the csv metadata back as part of response.
function Get-CSVMetadata ([string]$MetadataUri) {
    $metadataResponse = Invoke-RestMethod -Uri $MetadataUri -method "GET" -MaximumRetryCount 3 -RetryIntervalSec 10 | ConvertFrom-Csv
    return $metadataResponse
}
  
# Given the github io blob storage url and language regex,
# the helper function will return a list of artifact names.
function Get-BlobStorage-Artifacts($blobStorageUrl, $blobDirectoryRegex, $blobArtifactsReplacement) {
    LogDebug "Reading artifact from storage blob ..."
    $returnedArtifacts = @()
    $pageToken = ""
    Do {
      $resp = ""
      if (!$pageToken) {
        # First page call.
        $resp = Invoke-RestMethod -Method Get -Uri $blobStorageUrl
      }
      else {
        # Next page call
        $blobStorageUrlPageToken = $blobStorageUrl + "&marker=$pageToken"
        $resp = Invoke-RestMethod -Method Get -Uri $blobStorageUrlPageToken
      }
      # Convert to xml documents. 
      $xmlDoc = [xml](removeBomFromString $resp)
      foreach ($elem in $xmlDoc.EnumerationResults.Blobs.BlobPrefix) {
        # What service return like "dotnet/Azure.AI.Anomalydetector/", needs to fetch out "Azure.AI.Anomalydetector"
        $artifact = $elem.Name -replace $blobDirectoryRegex, $blobArtifactsReplacement
        $returnedArtifacts += $artifact
      }
      # Fetch page token
      $pageToken = $xmlDoc.EnumerationResults.NextMarker
    } while ($pageToken)
    return $returnedArtifacts
  }
  
# The sequence of Bom bytes differs by different encoding. 
# The helper function here is only to strip the utf-8 encoding system as it is used by blob storage list api.
# Return the original string if not in BOM utf-8 sequence.
function RemoveBomFromString([string]$bomAwareString) {
    if ($bomAwareString.length -le 3) {
        return $bomAwareString
    }
    $bomPatternByteArray = [byte[]] (0xef, 0xbb, 0xbf)
    # The default encoding for powershell is ISO-8859-1, so converting bytes with the encoding.
    $bomAwareBytes = [Text.Encoding]::GetEncoding(28591).GetBytes($bomAwareString.Substring(0, 3))
    if (@(Compare-Object $bomPatternByteArray $bomAwareBytes -SyncWindow 0).Length -eq 0) {
        return $bomAwareString.Substring(3)
    }
    return $bomAwareString
}
  
function Get-TocMapping { 
    Param (
        [Parameter(Mandatory = $true)] [Object[]] $metadata,
        [Parameter(Mandatory = $true)] [String[]] $artifacts
    )
    # Used for sorting the toc display order
    $orderServiceMapping = @{}

    foreach ($artifact in $artifacts) {
        $packageInfo = $metadata | ? {$_.Package -eq $artifact}
        
        if ($packageInfo -and $packageInfo[0].Hide -eq 'true') {
            LogDebug "The artifact $artifact set 'Hide' to 'true'."
            continue
        }
        $serviceName = ""
        if (!$packageInfo -or !$packageInfo[0].ServiceName) {
            LogWarning "There is no service name for artifact $artifact. Please check csv of Azure/azure-sdk/_data/release/latest repo if this is intended. "
            # If no service name retrieved, print out warning message, and put it into Other page.
            $serviceName = "Other"
        }
        else {
            if ($packageInfo.Length -gt 1) {
                LogWarning "There are more than 1 packages fetched out for artifact $artifact. Please check csv of Azure/azure-sdk/_data/release/latest repo if this is intended. "
            }
            $serviceName = $packageInfo[0].ServiceName.Trim()
        }
        $orderServiceMapping[$artifact] = $serviceName
    }
    return $orderServiceMapping                   
}

function GenerateDocfxTocContent([Hashtable]$tocContent, [String]$lang) {
    LogDebug "Start generating the docfx toc and build docfx site..."
    $DocOutDir = "${RepoRoot}/docfx_project"

    LogDebug "Initializing Default DocFx Site..."
    & $($DocFx) init -q -o "${DocOutDir}"
    # The line below is used for testing in local
    # docfx init -q -o "${DocOutDir}"
    LogDebug "Copying template and configuration..."
    New-Item -Path "${DocOutDir}" -Name "templates" -ItemType "directory" -Force
    Copy-Item "${DocGenDir}/templates/*" -Destination "${DocOutDir}/templates" -Force -Recurse
    Copy-Item "${DocGenDir}/docfx.json" -Destination "${DocOutDir}/" -Force
    $YmlPath = "${DocOutDir}/api"
    New-Item -Path $YmlPath -Name "toc.yml" -Force
    $visitedService = @{}
    # Sort and display toc service name by alphabetical order.
    foreach ($serviceMapping in $tocContent.getEnumerator() | Sort Value) {
        $artifact = $serviceMapping.Key
        $serviceName = $serviceMapping.Value
        $fileName = ($serviceName -replace '\s', '').ToLower().Trim()
        if ($visitedService.ContainsKey($serviceName)) {
            Add-Content -Path "$($YmlPath)/${fileName}.md" -Value "#### $artifact"
        }
        else {
            Add-Content -Path "$($YmlPath)/toc.yml" -Value "- name: ${serviceName}`r`n  href: ${fileName}.md"
            New-Item -Path $YmlPath -Name "${fileName}.md" -Force
            Add-Content -Path "$($YmlPath)/${fileName}.md" -Value "#### $artifact"
            $visitedService[$serviceName] = $true
        }
    }

    # Generate toc homepage.
    LogDebug "Creating Site Title and Navigation..."
    New-Item -Path "${DocOutDir}" -Name "toc.yml" -Force
    Add-Content -Path "${DocOutDir}/toc.yml" -Value "- name: Azure SDK for $lang APIs`r`n  href: api/`r`n  homepage: api/index.md"

    LogDebug "Copying root markdowns"
    Copy-Item "$($RepoRoot)/README.md" -Destination "${DocOutDir}/api/index.md" -Force
    Copy-Item "$($RepoRoot)/CONTRIBUTING.md" -Destination "${DocOutDir}/api/CONTRIBUTING.md" -Force

    LogDebug "Building site..."
    & $($DocFx) build "${DocOutDir}/docfx.json"
    # The line below is used for testing in local
    # docfx build "${DocOutDir}/docfx.json"
    Copy-Item "${DocGenDir}/assets/logo.svg" -Destination "${DocOutDir}/_site/" -Force    
}

if ((Get-ChildItem -Path Function: | ? { $_.Name -eq $GetGithubIoDocIndexFn  }).Count -gt 0)
{
    &$GetGithubIoDocIndexFn
}
else
{
    LogWarning "The function '$GetGithubIoDocIndexFn' was not found."
}