Added plugin for creating github releases

AU/Plugins/GitReleases.ps1

@@ -0,0 +1,130 @@
+# Author: Kim Nordmo <kim.nordmo@gmail.com>
+# Last Change: 29-Oct-2017.
+
+param(
+    $Info,
+
+    # Github API token to use when creating/checking releases and uploading artifacts
+    [string]$ApiToken,
+
+    # What kind of release should be created, either 1 release per date, or 1 release per package and version is supported.
+    [ValidateSet('date', 'package')]
+    [string]$releaseType,
+
+    # The text that should be used in the header of the release.
+    [string]$releaseHeader = $null,
+
+    # The text that should be used in the description of the release.
+    [string]$releaseDescription = $null,
+
+    # The formatting to use when replacing <date> in release header/description and on date based releases.
+    [string]$dateFormat = '{0:yyyy-MM-dd}',
+
+    # Force creating a release when a package have been updated and not just been pushed.
+    [switch]$Force
+)
+
+function GetOrCreateRelease() {
+    param(
+        [string]$tagName,
+        [string]$releaseName,
+        [string]$releaseDescription,
+        [string]$repository,
+        $headers)
+
+    try {
+        Write-Verbose "Checking for a release using the tag: $tagName..."
+        $response = Invoke-RestMethod -UseBasicParsing -Uri "https://api.github.com/repos/$repository/releases/tags/$tagName" -Headers $headers | ? tag_name -eq $tagName
+        if ($response) {
+            return $response
+        }
+    }
+    catch {
+    }
+
+    $json = @{
+        "tag_name"         = $tagName
+        "target_commitish" = "master"
+        "name"             = $releaseName
+        "body"             = $releaseDescription
+        "draft"            = $false
+        "prerelease"       = $false
+    } | ConvertTo-Json -Compress
+
+    Write-Verbose "Trying to create the new release $tagName..."
+    return Invoke-RestMethod -UseBasicParsing -Method Post -Uri "https://api.github.com/repos/$repository/releases" -Body $json -Headers $headers
+}
+
+[array]$packages = if ($Force) { $Info.result.updated } else { $Info.result.pushed }
+if ($packages.Length -eq 0) { Write-Host "No package updated, skipping"; return }
+
+$origin = git config --get remote.origin.url
+
+if (!($origin -match "github.com\/([^\/]+\/[^\/\.]+)")) {
+    Write-Warning "Unable to parse the repository information, skipping..."
+    return;
+}
+$repository = $Matches[1]
+
+$headers = @{
+  Authorization = "token $ApiToken"
+}
+
+if ($releaseType -eq 'date' -and !$releaseHeader) {
+  $releaseHeader = 'Packages updated on <date>'
+} elseif (!$releaseHeader) {
+  $releaseHeader = '<PackageName> <RemoteVersion>'
+}
+
+if ($releaseType -eq 'date' -and !$releaseDescription) {
+  $releaseDescription = 'We had packages that was updated on <date>'
+} elseif (!$releaseDescription) {
+  $releaseDescription = '<PackageName> was updated from version <NuspecVersion> to <RemoteVersion>'
+}
+
+$date = Get-Date -UFormat $dateFormat
+
+if ($releaseType -eq 'date') {
+  $release = GetOrCreateRelease `
+    -tagName $date `
+    -releaseName ($releaseHeader -replace '<date>',$date) `
+    -releaseDescription ($releaseDescription -replace '<date>',$date) `
+    -repository $repository `
+    -headers $headers
+
+  if (!$release) {
+    Write-Error "Unable to create a new release, please check your permissions..."
+    return
+  }
+}
+
+$uploadHeaders = $headers.Clone()
+$uploadHeaders['Content-Type'] = 'application/zip'
+
+$packages | % {
+  if ($releaseType -eq 'package') {
+    $releaseName = $releaseHeader -replace '<PackageName>',$_.Name -replace '<RemoteVersion>',$_.RemoteVersion -replace '<NuspecVersion>',$_.NuspecVersion -replace '<date>',$date
+    $packageDesc = $releaseDescription -replace '<PackageName>',$_.Name -replace '<RemoteVersion>',$_.RemoteVersion -replace '<NuspecVersion>',$_.NuspecVersion -replace '<date>',$date
+
+    $release = GetOrCreateRelease `
+      -tagName "$($_.Name)-$($_.RemoteVersion)" `
+      -releaseName $releaseName `
+      -releaseDescription $packageDesc `
+      -repository $repository `
+      -headers $headers
+  }
+
+  $path = Resolve-Path "$($_.Path)\*.nupkg"
+  $fileName = [System.IO.Path]::GetFileName($path)
+
+  $existing = $release.assets | ? name -eq $fileName
+  if ($existing) {
+    Write-Verbose "Removing existing $fileName asset..."
+    Invoke-RestMethod -UseBasicParsing -Uri $existing.url -method Delete -Headers $headers | Out-Null
+  }
+
+  $uploadUrl = $release.upload_url -replace '\{.*\}$',''
+  $rawContent = [System.IO.File]::ReadAllBytes($path)
+  Write-Host "Uploading $fileName asset..."
+  Invoke-RestMethod -UseBasicParsing -Uri "${uploadUrl}?name=${fileName}&label=$($_.Name) v$($_.RemoteVersion)" -Body $rawContent -Headers $uploadHeaders -Method Post | Out-Null
+}