lib/middleman-webp/extension.rb in middleman-webp-0.2.5 vs lib/middleman-webp/extension.rb in middleman-webp-0.2.6

@@ -1,19 +1,46 @@
 require 'middleman-core'
 require 'middleman-webp/converter'
 
+require 'shell'
+
 module Middleman
   class WebPExtension < Extension
     option(:conversion_options, {},
            'Custom conversion options for cwebp/gif2webp')
+    option(:append_extension, false,
+           'keep the original filename and extension and append .webp (image.png => image.png.webp)')
     option(:ignore, [], 'Ignores files with matching paths')
+    option(:verbose, false, 'Display all external command which are executed '\
+           'to help debugging.')
+
     def initialize(app, options_hash = {}, &block)
       super
+      @app = app
+    end
 
-      configuration = options
+    def after_build(builder)
+      return unless dependencies_installed?(builder)
+      Middleman::WebP::Converter.new(@app, options, builder).convert
+    end
 
-      app.after_build do |builder|
-        Middleman::WebP::Converter.new(app, configuration, builder).convert
+    # Internal: Check that cwebp and gif2webp commandline tools are available.
+    #
+    # Returns true if all is OK.
+    def dependencies_installed?(builder)
+      sh = Shell.new
+
+      begin
+        sh.find_system_command('gif2webp')
+      rescue Shell::Error::CommandNotFound => e
+        builder.say_status :webp, "#{e.message} Please install latest version of webp library and tools to get gif2webp and be able to convert gif files also.", :red
+      end
+
+      begin
+        true if sh.find_system_command('cwebp')
+      rescue Shell::Error::CommandNotFound => e
+        builder.say_status :webp, "ERROR: #{e.message} Please install cwebp and gif2webp commandline tools first.", :red
+        false
       end
     end
   end
 end