Merge pull request #30 from DannyBen/add/error-capture-on-watch

Capture error when running render --watch

lib/victor/cli/commands/render.rb

@@ -18,11 +18,12 @@ class Render < Base
         param "SVG_FILE", "Output SVG file. Leave empty to write to stdout"
 
         example "victor render input.rb output.svg"
+        example "victor render input.rb output.svg --watch"
         example "victor render input.rb --template minimal"
 
         def run
           if args['--watch']
-            watch { generate }
+            watch_and_generate
           else
             generate
           end
@@ -54,6 +55,14 @@ def watch
           end
         end
 
+        def watch_and_generate
+          watch do
+            generate
+          rescue Exception => e
+            say! "!undred!#{e.class}!txtrst!\n#{e.message}"
+          end
+        end
+
         def file_watcher
           @file_watcher ||= Filewatcher.new(ruby_file, immediate: true)
         end

spec/approvals/cli/render/help

@@ -24,4 +24,5 @@ Parameters:
 
 Examples:
   victor render input.rb output.svg
+  victor render input.rb output.svg --watch
   victor render input.rb --template minimal

spec/approvals/cli/render/watch-error

@@ -0,0 +1,2 @@
+Exception
+Intentional error

spec/victor-cli/commands/render_spec.rb

@@ -33,6 +33,22 @@
         subject.run %W[render #{ruby_file} --watch]
       end.to output_approval('cli/render/watch')
     end
+
+    context "when the script contains an error" do
+      it "shows it gracefully and continues to watch" do
+        command = Victor::CLI::Commands::Render
+        expect do
+          expect_any_instance_of(command).to receive(:watch) do |watcher, &block|
+            expect_any_instance_of(command).to receive(:generate) do
+              raise Exception, "Intentional error"
+            end
+            changes = { "some-path" => :updated }
+            block.call changes
+          end
+          subject.run %W[render #{ruby_file} --watch]
+        end.to output_approval('cli/render/watch-error').to_stderr
+      end
+    end
   end
 
   context "with RUBY_FILE SVG_FILE" do