Tweak / fix publish messages (#1535)

Author: alexarchambault

modules/cli/src/main/scala/scala/cli/commands/publish/Publish.scala

@@ -334,7 +334,7 @@ object Publish extends ScalaCommand[PublishOptions] with BuildCommandHelpers {
   private def defaultName(workspace: os.Path, logger: Logger): String = {
     val name = workspace.last
     logger.message(
-      s"Using directive publish.name not set, using workspace file name $name as default name"
+      s"Using directive publish.name not specified, using workspace directory name $name as default name"
     )
     name
   }
@@ -1024,7 +1024,7 @@ object Publish extends ScalaCommand[PublishOptions] with BuildCommandHelpers {
                 Seq(mod.organization.value, mod.name.value, version)
               else
                 mod.organization.value.split('.').toSeq ++ Seq(mod.name.value, version)
-            elems.map("/" + _).mkString
+            elems.map("/" + _).mkString + "/"
           }
           val path = {
             val url = checkRepo.root.stripSuffix("/") + relPath

modules/cli/src/main/scala/scala/cli/commands/publish/PublishSetup.scala

@@ -125,9 +125,9 @@ object PublishSetup extends ScalaCommand[PublishSetupOptions] {
 
     if (missingFields.nonEmpty) {
       val count = missingFields.length
-      logger.message(s"$count ${if (count > 1) "options" else "option"} need to be set")
+      logger.message(s"$count ${if (count > 1) "options need" else "option needs"} to be set")
       for (check <- missingFields)
-        logger.debug(s"  ${check.fieldName}")
+        logger.message(s"  ${check.fieldName}")
       logger.message("") // printing an empty line, for readability
     }
 

modules/cli/src/main/scala/scala/cli/commands/publish/checks/UrlCheck.scala

@@ -28,7 +28,7 @@ final case class UrlCheck(
       case Right((org, name)) =>
         val url = s"https://github.com/$org/$name"
         logger.message("url:")
-        logger.message(s"  using GitHub repository $url")
+        logger.message(s"  using GitHub repository URL $url")
         Some(url)
     }
     options.publishParams.url

modules/cli/src/main/scala/scala/cli/errors/MissingPublishOptionError.scala

@@ -11,10 +11,9 @@ final class MissingPublishOptionError(
 ) extends BuildException(
       {
         val directivePart =
-          if (directiveName.isEmpty)
-            s" or with a 'using $directiveName' directive"
+          if (directiveName.isEmpty) ""
           else
-            ""
+            s" or with a '//> using $directiveName' directive"
         val configPart =
           if (configKeys.isEmpty) ""
           else