Stream output to stdout

2 files changed, 77 insertions, 3 deletions

diff --git a/lib/spandx/cli/commands/scan.rb b/lib/spandx/cli/commands/scan.rb
index 9e874f3..fa5978c 100644
--- a/lib/spandx/cli/commands/scan.rb
+++ b/lib/spandx/cli/commands/scan.rb
@@ -14,16 +14,18 @@ module Spandx
         end
 
         def execute(output: $stdout)
-          report = ::Spandx::Core::Report.new
+          printer = ::Spandx::Core::Printer.for(@options[:format])
+
+          printer.print_header(output)
           each_file do |file|
             spinner.spin(file)
             each_dependency_from(file) do |dependency|
               spinner.spin(file)
-              report.add(dependency)
+              printer.print_line(dependency, output)
             end
           end
+          printer.print_footer(output)
           spinner.stop
-          output.puts(format(report.to(@options[:format])))
         end
 
         private
diff --git a/lib/spandx/core/printer.rb b/lib/spandx/core/printer.rb
new file mode 100644
index 0000000..7cf89df
--- /dev/null
+++ b/lib/spandx/core/printer.rb
@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+
+module Spandx
+  module Core
+    class Printer
+      def match?(_format)
+        raise ::Spandx::Error, :match?
+      end
+
+      def print_header(io)
+      end
+
+      def print_line(dependency, io)
+        io.puts(dependency.to_s)
+      end
+
+      def print_footer(io)
+      end
+
+      class << self
+        include Registerable
+
+        def for(format)
+          find { |x| x.match?(format) } || new
+        end
+      end
+    end
+
+    class CsvPrinter < Printer
+      def match?(format)
+        format.to_sym == :csv
+      end
+
+      def print_line(dependency, io)
+        io.puts(CSV.generate_line(dependency.to_a))
+      end
+    end
+
+    class JsonPrinter < Printer
+      def match?(format)
+        format.to_sym == :json
+      end
+
+      def print_line(dependency, io)
+        io.puts(Oj.dump(dependency.to_h))
+      end
+    end
+
+    class TablePrinter < Printer
+      def match?(format)
+        format.to_sym == :table
+      end
+
+      def print_header(io)
+        @dependencies = SortedSet.new
+      end
+
+      def print_line(dependency, io)
+        @dependencies << dependency
+      end
+
+      def print_footer(io)
+        table = Terminal::Table.new(headings: ['Name', 'Version', 'Licenses', 'Location'], output: io) do |t|
+          @dependencies.each do |d|
+            t.add_row d.to_a
+          end
+        end
+        io.puts(table)
+      end
+    end
+  end
+end