dev-cmd/create: also prompt for name with --cask

Library/Homebrew/dev-cmd/create.rb

@@ -85,11 +85,15 @@ module Homebrew
   end
 
   def create_cask(args:)
-    raise UsageError, "The `--set-name` flag is required for creating casks." if args.set_name.blank?
-
     url = args.named.first
-    name = args.set_name
-    token = Cask::Utils.token_from(args.set_name)
+    name = if args.set_name.blank?
+      stem = Pathname.new(url).stem.rpartition("=").last
+      print "Cask name [#{stem}]: "
+      __gets || stem
+    else
+      args.set_name
+    end
+    token = Cask::Utils.token_from(name)
 
     cask_tap = Tap.fetch(args.tap || "homebrew/cask")
     raise TapUnavailableError, args.tap unless cask_tap.installed?
@@ -139,13 +143,19 @@ module Homebrew
 
   def create_formula(args:)
     fc = FormulaCreator.new(args)
-    fc.name = args.set_name
+    fc.name = if args.set_name.blank?
+      stem = Pathname.new(args.named.first).stem.rpartition("=").last
+      print "Formula name [#{stem}]: "
+      __gets || stem
+    else
+      args.set_name
+    end
     fc.version = args.set_version
     fc.license = args.set_license
     fc.tap = Tap.fetch(args.tap || "homebrew/core")
     raise TapUnavailableError, args.tap unless fc.tap.installed?
 
-    fc.url = args.named.first # Pull the first (and only) URL from ARGV
+    fc.url = args.named.first
 
     fc.mode = if args.autotools?
       :autotools
@@ -169,13 +179,6 @@ module Homebrew
       :rust
     end
 
-    if fc.name.nil? || fc.name.strip.empty?
-      stem = Pathname.new(fc.url).stem.rpartition("=").last
-      print "Formula name [#{stem}]: "
-      fc.name = __gets || stem
-      fc.update_path
-    end
-
     # Check for disallowed formula, or names that shadow aliases,
     # unless --force is specified.
     unless args.force?

Library/Homebrew/test/dev-cmd/create_spec.rb

@@ -10,7 +10,7 @@ describe "brew create" do
   it_behaves_like "parseable arguments"
 
   it "creates a new Formula file for a given URL", :integration_test do
-    brew "create", url, "HOMEBREW_EDITOR" => "/bin/cat"
+    brew "create", "--set-name=Testball", url, "HOMEBREW_EDITOR" => "/bin/cat"
 
     expect(formula_file).to exist
     expect(formula_file.read).to match(%Q(sha256 "#{TESTBALL_SHA256}"))