datahub/gradle/versioning/versioning.gradle

/**
 Applies a consistent versioning scheme to all projects using this script

Uses git tags to mint versions by default. 
git tags can be of a few forms:
- short sha (typical for a PR or a commit) (e.g. 38960ae)
- versioned tags (typical for a release) (e.g. v0.8.45, v0.8.45.1, v0.8.45rc1, v0.8.45.1rc4)

Produces the following variables and supports token replacement
- version: server version amenable for creating jars
- fullVersion: full version string 
- cliMajorVersion: cli version amenable for binding to server as a default
  0.8.44 or 0.8.44-1 (for clean tags) or 0.8.45-SNAPSHOT (for unclean repositories)

 All inference can be overridden by passing in the releaseVersion property
 e.g. -PreleaseVersion=0.2.3.4 will set the jar version to 0.2.3-4

 **/


import org.apache.tools.ant.filters.ReplaceTokens

def detailedVersionString = "0.0.0-unknown-SNAPSHOT"
def cliMajorVersion = "0.9.5" // base default cli major version
def snapshotVersion = false
if (project.hasProperty("releaseVersion")) {
  version = releaseVersion
  detailedVersionString = releaseVersion
} else {
  try {
      // apply this plugin in a try-catch block so that we can handle cases without .git directory
      apply plugin: "com.palantir.git-version"
      def details = versionDetails()
      detailedVersionString = gitVersion()
      version = details.lastTag
      version = version.startsWith("v")? version.substring(1): version
      def suffix = details.isCleanTag? "": "-SNAPSHOT"
      snapshotVersion = ! details.isCleanTag
    }
    catch (Exception e) {
          e.printStackTrace()
          // last fall back
          version = detailedVersionString
    }
}

// trim version if it is of size 4 to size 3
def versionParts = version.tokenize(".")
if (versionParts.size() > 3) {
  // at-least 4 part version
  // we check if the 4th part is a .0 in which case we want to create a release
  if ((versionParts.size() == 4) && (versionParts[3] == '0')) {
    versionParts = versionParts[0..2]
  }
  version = versionParts[0..2].join('.')
  if (versionParts.size() > 3) {
      version = version + "-" + versionParts[3..versionParts.size()-1].join('-')
  }
  cliMajorVersion = version
} else if (versionParts.size() == 3) {
  cliMajorVersion = version
}

if (snapshotVersion) {
    if (versionParts[versionParts.size()-1].isInteger()) {
      def base_version = versionParts[0..versionParts.size()-2].join('.')
      version = base_version + '.' + (versionParts[versionParts.size()-1].toInteger()+1).toString() + "-SNAPSHOT"
      cliMajorVersion = base_version + "." + versionParts[versionParts.size()-1]
    } else {
      // we are unable to part the last token as an integer, so we just append SNAPSHOT to this version
      version = versionParts[0..versionParts.size()-1].join('.') + '-SNAPSHOT'
      cliMajorVersion = versionParts[0..versionParts.size()-1].join('.')
  }
}


processResources {
  filter(ReplaceTokens, tokens:[fullVersion: detailedVersionString])
  filter(ReplaceTokens, tokens:[cliMajorVersion: cliMajorVersion])
}

task printVersionDetails() {
  println("fullVersion=" + detailedVersionString)
  println("cliMajorVersion=" + cliMajorVersion)
  println("version=" +  version)
}