Log compression statistics;

Work relating to #302.

lib/vedeu/output/compressor.rb

@@ -58,7 +58,7 @@ def content
 
       # @return [String]
       def compress
-        Vedeu.timer("Compression for #{content.size} characters".freeze) do
+        Vedeu.timer("Compression for #{content.size} objects".freeze) do
           out = ''
 
           content.each do |cell|
@@ -68,6 +68,10 @@ def compress
             out << cell.value
           end
 
+          Vedeu.log(type:    :output,
+                    message: "Compression: #{content.size} objects -> " \
+                             "#{out.size} characters".freeze)
+
           out
         end
       end
@@ -80,6 +84,10 @@ def uncompress
           out << cell.to_s
         end
 
+        Vedeu.log(type:    :output,
+                  message: "No compression: #{content.size} objects -> " \
+                           "#{out.size} characters".freeze)
+
         out
       end