Rename :require to :jar and deprecate :require

[Cherry-picked 4649d5e]

Author: aherlihy

compiler/src/dotty/tools/repl/ParseResult.scala

@@ -52,13 +52,20 @@ object Load {
   val command: String = ":load"
 }
 
-/** `:require <path>` adds a jar to the classpath
+/** `:require` is a deprecated alias for :jar`
  */
 case class Require(path: String) extends Command
 object Require {
   val command: String = ":require"
 }
 
+/** `:jar <path>` adds a jar to the classpath
+ */
+case class JarCmd(path: String) extends Command
+object JarCmd {
+  val command: String = ":jar"
+}
+
 /** `:kind <type>` display the kind of a type. see also :help kind
  */
 case class KindOf(expr: String) extends Command
@@ -158,6 +165,7 @@ object ParseResult {
     Help.command -> (_  => Help),
     Reset.command -> (arg  => Reset(arg)),
     Imports.command -> (_  => Imports),
+    JarCmd.command -> (arg => JarCmd(arg)),
     KindOf.command -> (arg => KindOf(arg)),
     Load.command -> (arg => Load(arg)),
     Require.command -> (arg => Require(arg)),

compiler/src/dotty/tools/repl/ReplDriver.scala

@@ -518,6 +518,10 @@ class ReplDriver(settings: Array[String],
       }
 
     case Require(path) =>
+      out.println(":require has been deprecated and replaced with :jar. Please use :jar")
+      state
+
+    case JarCmd(path) =>
       val jarFile = AbstractFile.getDirectory(path)
       if (jarFile == null)
         out.println(s"""Cannot add "$path" to classpath.""")

compiler/test-resources/jars/MyLibrary.scala

@@ -1,5 +1,5 @@
 /**
- * JAR used for testing repl :require
+ * JAR used for testing repl :jar
  * Generated using: mkdir out; scalac -d out MyLibrary.scala; jar cf mylibrary.jar -C out .
  */
 package mylibrary

compiler/test-resources/jars/MyLibrary2.scala

@@ -1,5 +1,5 @@
 /**
- * JAR used for testing repl :require
+ * JAR used for testing repl :jar
  * Generated using: mkdir out2; scalac -d out MyLibrary2.scala; jar cf mylibrary2.jar -C out2 .
  */
 package mylibrary2

compiler/test-resources/repl/require-command

@@ -216,6 +216,7 @@ class TabcompleteTests extends ReplTest {
         ":exit",
         ":help",
         ":imports",
+        ":jar",
         ":kind",
         ":load",
         ":quit",