Merge pull request #94 from bdpiparva/github-release-task

Added preview release task

Author: bdpiprava

build.gradle

@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+import groovy.xml.MarkupBuilder
+
+import java.text.DecimalFormat
+
 plugins {
     id 'com.github.ben-manes.versions' version '0.20.0'
     id 'co.riiid.gradle' version '0.4.2'
@@ -120,9 +124,7 @@ task deploy(type: Copy) {
     into 'gocd/server/plugins/external'
 }
 
-githubRelease.dependsOn assemble
-
-def getLatestTag(boolean isExperimental) {
+static def getLatestTag(boolean isExperimental) {
     try {
         def command = ["git", "describe", "--tags", "--abbrev=0"]
         if (!isExperimental) {
@@ -133,8 +135,6 @@ def getLatestTag(boolean isExperimental) {
         process.waitFor()
         def result = process.text
 
-        println("\n\n cmd: ${command.join(" ")}  Result: ${result}")
-
         return result.trim()
     } catch (Exception e) {
         return null
@@ -162,6 +162,66 @@ def getCommitsSinceLastTag(String tag) {
     return hashStdOut.toString().trim()
 }
 
+static String readableFileSize(long size) {
+    if (size <= 0) return "0"
+    final String[] units = ["B", "KB", "MB", "GB", "TB"]
+    int digitGroups = (int) (Math.log10(size) / Math.log10(1024))
+    return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups]
+}
+
+task previewGithubRelease() {
+    doLast {
+        def prerelease = !"No".equalsIgnoreCase(System.getenv('PRERELEASE'))
+        def lastTag = getLatestTag(prerelease)
+        def repo = 'docker-swarm-elastic-agents'
+        def targetCommitish = project.gitRevision
+        def assets = jar.outputs.files.files
+        def tagName = "${project.fullVersion}${prerelease ? '-exp' : ''}"
+
+        def releaseName = "${prerelease ? 'Experimental: ' : ''}${project.fullVersion}"
+        def changelogHeader = lastTag ? "Changelog ${lastTag}..${project.fullVersion}" : "Changelog"
+
+        def changes = getCommitsSinceLastTag(lastTag).replaceAll("\"", "").stripIndent().trim()
+
+        def previewFile = file("${project.buildDir}/preview.html")
+        if (!previewFile.exists()) {
+            previewFile.createNewFile()
+        }
+        def html = new MarkupBuilder(new FileWriter(previewFile))
+        html.html {
+            body {
+                div {
+                    h1(repo)
+                    h3(releaseName)
+                    div {
+                        b("Tag: ")
+                        span(tagName)
+                    }
+                    div {
+                        b("Commit: ")
+                        span(targetCommitish.substring(0, 7))
+                    }
+
+                    div {
+                        h4("Assets")
+                        assets.each { div(it.getName() + " - " + readableFileSize(it.length())) }
+                    }
+
+                    div {
+                        h4(changelogHeader)
+                        p {
+                            changes.split("\n").each { div(it) }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+previewGithubRelease.dependsOn assemble
+githubRelease.dependsOn previewGithubRelease
+
 github {
     owner = System.getenv('GITHUB_USER') ?: 'bob'
     repo = 'docker-swarm-elastic-agents'