Add manual_stop option

README.md

@@ -499,6 +499,18 @@ The result may look like this:
 └── [✖] two
 ```
 
+If you wish to also have manual control over the top-level spinner, set
+the `manual_stop` option. This keeps the top-level spinner spinning even
+if all currently registered spinners have finished. You can then, for
+example, add more spinners or call `multi_spinner.success` even if a
+spinner has errored.
+
+```ruby
+multi_spinner = TTY::Spinner::Multi.new("[:spinner] top", manual_stop: true)
+```
+
+See also the `examples/multi/multi_manual_stop.rb` example.
+
 #### 5.2.2 auto async tasks
 
 In case when you wish to execute async tasks and update individual spinners automatically, in any order, about their task status use `#register` and pass additional block parameter with the job to be executed.

examples/multi/multi_manual_stop.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative "../../lib/tty-spinner"
+
+spinners = TTY::Spinner::Multi.new("[:spinner] Top level spinner",
+                                   manual_stop: true)
+
+sp1 = spinners.register "[:spinner] one"
+sp1.auto_spin
+
+sleep(2)
+sp1.success
+
+sp2 = spinners.register "[:spinner] two"
+sp3 = spinners.register "[:spinner] three"
+
+sp2.auto_spin
+sp3.auto_spin
+
+sleep(1)
+sp2.error
+sleep(1)
+sp3.success
+
+spinners.error # requires manual stop

lib/tty/spinner/multi.rb

@@ -49,13 +49,18 @@ class Multi
       #   clear ouptut when finished
       # @option options [Float] :interval
       #   the interval for auto spinning
+      # @option options [Boolean] :manual_stop
+      #   the top spinner (if present) doesn't automatically stop when all
+      #   registered spinners have finished, allowing new spinners to be
+      #   added after that.
       #
       # @api public
       def initialize(*args)
         super()
         @options = args.last.is_a?(::Hash) ? args.pop : {}
         message = args.empty? ? nil : args.pop
         @inset_opts = @options.delete(:style) { DEFAULT_INSET }
+        @manual_stop = @options.fetch(:manual_stop) { false }
         @rows = 0
         @spinners = []
         @spinners_count = 0
@@ -112,7 +117,7 @@ def create_spinner(pattern_or_spinner, options)
           pattern_or_spinner
         else
           raise ArgumentError, "Expected a pattern or spinner, " \
-            "got: #{pattern_or_spinner.class}"
+                               "got: #{pattern_or_spinner.class}"
         end
       end
 
@@ -259,8 +264,8 @@ def error
       # @api public
       def on(key, &callback)
         unless @callbacks.key?(key)
-          raise ArgumentError, "The event #{key} does not exist. " \
-                               " Use :spin, :success, :error, or :done instead"
+          raise ArgumentError, "The event #{key} does not exist.  " \
+                               "Use :spin, :success, :error, or :done instead"
         end
         @callbacks[key] << callback
         self
@@ -317,6 +322,8 @@ def spin_handler
       # @api private
       def success_handler
         proc do
+          next if @manual_stop && @top_spinner
+
           if success?
             @top_spinner.success if @top_spinner
             emit(:success)
@@ -329,6 +336,8 @@ def success_handler
       # @api private
       def error_handler
         proc do
+          next if @manual_stop && @top_spinner
+
           if error?
             @top_spinner.error if @top_spinner
             @fired ||= emit(:error) # fire once
@@ -341,6 +350,8 @@ def error_handler
       # @api private
       def done_handler
         proc do
+          next if @manual_stop && @top_spinner
+
           if done?
             @top_spinner.stop if @top_spinner && !error? && !success?
             emit(:done)

spec/unit/multi/auto_spin_spec.rb

@@ -28,5 +28,27 @@
     spinners.auto_spin
 
     expect(jobs).to match_array(%w[one two])
+    expect(spinners.top_spinner.done?).to be(true)
+  end
+
+  context "when manual_stop option is set" do
+    it "keeps the top level spinner spinning" do
+      spinners = TTY::Spinner::Multi.new("top", output: output, manual_stop: true)
+      jobs = []
+
+      spinners.register("one") { |sp| jobs << "one"; sp.success }
+      spinners.register("two") { |sp| jobs << "two"; sp.success }
+
+      spinners.auto_spin
+
+      spinner = spinners.register("three") { |sp| jobs << "three"; sp.success }
+      spinner.run
+
+      expect(jobs).to match_array(%w[one two three])
+
+      expect(spinners.top_spinner.done?).to be(false)
+      spinners.success
+      expect(spinners.top_spinner.done?).to be(true)
+    end
   end
 end