Fix the way SNAPSHOT versions are created

gradle/versioning.gradle

@@ -8,15 +8,44 @@ ext.getTag = { ->
     return stdout.toString().trim().substring(1)
 }
 
-// 0.20.0-2-g000a42a -> 0.20.0-SNAPSHOT
+// 0.20.1 -> 0.21.0
+ext.getNextVersion = { String versionString ->
+    def split = versionString.split('\\.')
+    if (split.length != 3) {
+        throw new IllegalArgumentException("Expect a version to be semver (major.minor.patch), but got: " + versionString)
+    }
+    return split[0] + '.' + (Integer.parseInt(split[1]) + 1) + '.0'
+}
+
+// 0.20.1-2-g000a42a -> 0.21.0-SNAPSHOT
+// 0.20.1-some-postfix-2-g000a42a -> 0.21.0-some-postfix-SNAPSHOT
 // 0.20.0 -> 0.20.0
 // Used to name jar files
 ext.getVersionName = { ->
-    def split = getTag().split('-')
-    if (split.size() > 1) {
-        return split[0] + '-SNAPSHOT'
+    String tag = getTag()
+    def split = tag.split('-')
+    if (split.length > 2) {
+        if (split[split.length - 1].startsWith('g')) {
+            // we are not on tag, create a snapshot version
+            String result = getNextVersion(split[0])
+
+            //if the version/tag has any postfixes after -, we preserve the,
+            for (int i = 1; i < split.length - 2; i++) {
+                result += split[i]
+            }
+            return result + '-SNAPSHOT'
+
+        } else {
+            // the last element of describe should start with g according to git describe format
+            // if we are not exactly on a tag. If it doesn't - we are on a tag
+            return tag
+        }
+
+
+    } else {
+        //we are exactly on the tag, return the tag instead of SNAPSHOT
+        return tag
     }
-    return split[0]
 }
 
 // 0.20.0-SNAPSHOT -> 0.20.0