Add -P option to force display of progress bars...

...else also look at the COURSIER_PROGRESS env var to force enabling or disabling them.

This deprecates the COURSIER_NO_TERM env var.

cache/src/main/scala/coursier/TermDisplay.scala

@@ -56,10 +56,17 @@ object Terminal {
 }
 
 object TermDisplay {
-  private def defaultFallbackMode: Boolean = {
-    val env = sys.env.get("COURSIER_NO_TERM").nonEmpty
+  def defaultFallbackMode: Boolean = {
+    val env0 = sys.env.get("COURSIER_PROGRESS").map(_.toLowerCase).collect {
+      case "true"  | "enable"  | "1" => true
+      case "false" | "disable" | "0" => false
+    }
+    def compatibilityEnv = sys.env.get("COURSIER_NO_TERM").nonEmpty
+
     def nonInteractive = System.console() == null
 
+    val env = env0.getOrElse(compatibilityEnv)
+
     env || nonInteractive
   }
 

cli/src/main/scala-2.11/coursier/cli/Helper.scala

@@ -201,9 +201,15 @@ class Helper(
     filter = Some(dep => keepOptional || !dep.optional)
   )
 
+  val loggerFallbackMode =
+    !progress && TermDisplay.defaultFallbackMode
+
   val logger =
     if (verbosityLevel >= 0)
-      Some(new TermDisplay(new OutputStreamWriter(System.err)))
+      Some(new TermDisplay(
+        new OutputStreamWriter(System.err),
+        fallbackMode = loggerFallbackMode
+      ))
     else
       None
 
@@ -333,7 +339,10 @@ class Helper(
 
     val logger =
       if (verbosityLevel >= 0)
-        Some(new TermDisplay(new OutputStreamWriter(System.err)))
+        Some(new TermDisplay(
+          new OutputStreamWriter(System.err),
+          fallbackMode = loggerFallbackMode
+        ))
       else
         None
 

cli/src/main/scala-2.11/coursier/cli/Options.scala

@@ -18,6 +18,9 @@ case class CommonOptions(
   @Help("Increase verbosity (specify several times to increase more)")
   @Short("v")
     verbose: Int @@ Counter,
+  @Help("Force display of progress bars")
+  @Short("P")
+    progress: Boolean,
   @Help("Maximum number of resolution iterations (specify a negative value for unlimited, default: 100)")
   @Short("N")
     maxIterations: Int = 100,
@@ -163,7 +166,7 @@ case class BootstrapOptions(
     mainClass: String,
   @Short("o")
     output: String = "bootstrap",
-  @Short("D")
+  @Short("d")
     downloadDir: String,
   @Short("f")
     force: Boolean,
@@ -172,7 +175,7 @@ case class BootstrapOptions(
     standalone: Boolean,
   @Help("Set Java properties in the generated launcher.")
   @Value("key=value")
-  @Short("P")
+  @Short("D")
     property: List[String],
   @Help("Set Java command-line options in the generated launcher.")
   @Value("option")