Add support for Ivy latest revision syntax

Like 2.2.+ for [2.2.0,2.3.0)

Fixes https://github.com/alexarchambault/coursier/issues/104

core/shared/src/main/scala/coursier/core/Parse.scala

@@ -10,6 +10,21 @@ object Parse {
     else Some(Version(s))
   }
 
+  def ivyLatestSubRevisionInterval(s: String): Option[VersionInterval] =
+    if (s.endsWith(".+")) {
+      for {
+        from <- version(s.stripSuffix(".+"))
+        if from.rawItems.nonEmpty
+        last <- Some(from.rawItems.last).collect { case n: Version.Numeric => n }
+        // a bit loose, but should do the job
+        if from.repr.endsWith(last.repr)
+        to <- version(from.repr.stripSuffix(last.repr) + last.next.repr)
+        // the contrary would mean something went wrong in the loose substitution above
+        if from.rawItems.init == to.rawItems.init
+      } yield VersionInterval(Some(from), Some(to), fromIncluded = true, toIncluded = false)
+    } else
+      None
+
   def versionInterval(s: String): Option[VersionInterval] = {
     for {
       fromIncluded <- if (s.startsWith("[")) Some(true) else if (s.startsWith("(")) Some(false) else None
@@ -28,6 +43,7 @@ object Parse {
     def noConstraint = if (s.isEmpty) Some(VersionConstraint.None) else None
 
     noConstraint
+      .orElse(ivyLatestSubRevisionInterval(s).map(VersionConstraint.Interval))
       .orElse(version(s).map(VersionConstraint.Preferred))
       .orElse(versionInterval(s).map(VersionConstraint.Interval))
   }

core/shared/src/main/scala/coursier/core/Version.scala

@@ -10,6 +10,10 @@ import coursier.core.compatibility._
  */
 case class Version(repr: String) extends Ordered[Version] {
   lazy val items = Version.items(repr)
+  lazy val rawItems: Seq[Version.Item] = {
+    val (first, tokens) = Version.Tokenizer(repr)
+    first +: tokens.toVector.map { case (_, item) => item }
+  }
   def compare(other: Version) = Version.listCompare(items, other.items)
   def isEmpty = items.forall(_.isEmpty)
 }
@@ -39,13 +43,20 @@ object Version {
     def compareToEmpty: Int = 1
   }
 
-  sealed trait Numeric extends Item
+  sealed trait Numeric extends Item {
+    def repr: String
+    def next: Numeric
+  }
   case class Number(value: Int) extends Numeric {
     val order = 0
+    def next: Number = Number(value + 1)
+    def repr: String = value.toString
     override def compareToEmpty = value.compare(0)
   }
   case class BigNumber(value: BigInt) extends Numeric {
     val order = 0
+    def next: BigNumber = BigNumber(value + 1)
+    def repr: String = value.toString
     override def compareToEmpty = value.compare(0)
   }
   case class Qualifier(value: String, level: Int) extends Item {

core/shared/src/main/scala/coursier/maven/MavenRepository.scala

@@ -261,6 +261,7 @@ case class MavenRepository(
   ): EitherT[F, String, (Artifact.Source, Project)] = {
 
     Parse.versionInterval(version)
+      .orElse(Parse.ivyLatestSubRevisionInterval(version))
       .filter(_.isValid) match {
         case None =>
           findNoInterval(module, version, fetch).map((source, _))

tests/shared/src/test/resources/resolutions/com.chuusai/shapeless_2.11/2.2.+

@@ -0,0 +1,2 @@
+com.chuusai:shapeless_2.11:jar:2.2.5
+org.scala-lang:scala-library:jar:2.11.7

tests/shared/src/test/resources/resolutions/com.chuusai/shapeless_2.11/[2.2.0,2.3.0)

@@ -0,0 +1,2 @@
+com.chuusai:shapeless_2.11:jar:2.2.5
+org.scala-lang:scala-library:jar:2.11.7

tests/shared/src/test/resources/resolutions/com.googlecode.libphonenumber/libphonenumber/7.0.+

@@ -0,0 +1 @@
+com.googlecode.libphonenumber:libphonenumber:jar:7.0.11

tests/shared/src/test/resources/resolutions/com.googlecode.libphonenumber/libphonenumber/[7.0,7.1)

@@ -0,0 +1 @@
+com.googlecode.libphonenumber:libphonenumber:jar:7.0.11

tests/shared/src/test/scala/coursier/test/CentralTests.scala

@@ -61,7 +61,15 @@ object CentralTests extends TestSuite {
       val result = res
         .dependencies
         .toVector
-        .map(repr)
+        .map { dep =>
+          val projOpt = res.projectCache
+            .get(dep.moduleVersion)
+            .map { case (_, proj) => proj }
+          val dep0 = dep.copy(
+            version = projOpt.fold(dep.version)(_.version)
+          )
+          repr(dep0)
+        }
         .sorted
         .distinct
 
@@ -149,6 +157,27 @@ object CentralTests extends TestSuite {
         "1.1.2"
       )
     }
+    'latestRevision - {
+      resolutionCheck(
+        Module("com.chuusai", "shapeless_2.11"),
+        "[2.2.0,2.3.0)"
+      )
+
+      resolutionCheck(
+        Module("com.chuusai", "shapeless_2.11"),
+        "2.2.+"
+      )
+
+      resolutionCheck(
+        Module("com.googlecode.libphonenumber", "libphonenumber"),
+        "[7.0,7.1)"
+      )
+
+      resolutionCheck(
+        Module("com.googlecode.libphonenumber", "libphonenumber"),
+        "7.0.+"
+      )
+    }
   }
 
 }