Make it easier to test scalafmt local snapshot build

build.sbt

@@ -1,12 +1,24 @@
 import Dependencies._
 import sbtcrossproject.CrossPlugin.autoImport.crossProject
 
+def parseTagVersion: String = {
+  import scala.sys.process._
+  // drop `v` prefix
+  "git describe --abbrev=0 --tags".!!.drop(1).trim
+}
+def localSnapshotVersion: String = s"$parseTagVersion-SNAPSHOT"
+def isCI = System.getenv("CI") != null
+
 def scala211 = "2.11.12"
 def scala212 = "2.12.8"
 def scala213 = "2.13.1"
 
 inThisBuild(
   List(
+    version ~= { dynVer =>
+      if (isCI) dynVer
+      else localSnapshotVersion // only for local publishng
+    },
     organization := "org.scalameta",
     homepage := Some(url("https://github.com/scalameta/scalafmt")),
     licenses := List(

scalafmt-dynamic/src/main/scala/org/scalafmt/dynamic/ScalafmtVersion.scala

@@ -22,7 +22,7 @@ object ScalafmtVersion {
       extends Exception(s"Invalid scalafmt version $version")
       with NoStackTrace
 
-  private val versionRegex = """(\d)\.(\d)\.(\d)(-RC(\d))?""".r
+  private val versionRegex = """(\d)\.(\d)\.(\d)(-RC(\d))?(?:-SNAPSHOT)?""".r
 
   def parse(version: String): Either[InvalidVersionException, ScalafmtVersion] =
     try {

scalafmt-dynamic/src/test/scala/tests/DynamicSuite.scala

@@ -323,9 +323,10 @@ class DynamicSuite extends FunSuite with DiffAssertions {
   check("wrong-version") { f =>
     f.setVersion("1.0")
     f.assertError(
-      "error: path/.scalafmt.conf: failed to resolve Scalafmt version '1.0'"
+      """|error: path/.scalafmt.conf: org.scalafmt.dynamic.exceptions.ScalafmtException: failed to resolve Scalafmt version '1.0'
+         |Caused by: org.scalafmt.dynamic.ScalafmtVersion$InvalidVersionException: Invalid scalafmt version 1.0""".stripMargin
     )
-    assert(f.downloadLogs.nonEmpty)
+    assert(f.downloadLogs.isEmpty)
   }
 
   check("sbt") { f =>

scalafmt-dynamic/src/test/scala/tests/ScalafmtVersionSuite.scala

@@ -12,6 +12,15 @@ class ScalafmtVersionSuite extends FunSuite {
       ScalafmtVersion.parse("2.0.0-RC4") == Right(ScalafmtVersion(2, 0, 0, 4))
     )
     assert(ScalafmtVersion.parse("2.1.1") == Right(ScalafmtVersion(2, 1, 1, 0)))
+    assert(
+      ScalafmtVersion
+        .parse("2.2.3-SNAPSHOT") == Right(ScalafmtVersion(2, 2, 3, 0))
+    )
+    assert(
+      ScalafmtVersion.parse("2.0.0-RC1-SNAPSHOT") == Right(
+        ScalafmtVersion(2, 0, 0, 1)
+      )
+    )
   }
 
   test("fail on invalid versions") {
@@ -51,6 +60,11 @@ class ScalafmtVersionSuite extends FunSuite {
       ScalafmtVersion
         .parse("2.1.0-RC1-M4") == Left(InvalidVersionException("2.1.0-RC1-M4"))
     )
+    assert(
+      ScalafmtVersion.parse("2.0.0-RC1+metadata") == Left(
+        InvalidVersionException("2.0.0-RC1+metadata")
+      )
+    )
   }
 
   test("order versions") {