lib/graphviz/dot2ruby.rb in ruby-graphviz-1.0.9 vs lib/graphviz/dot2ruby.rb in ruby-graphviz-1.1.0

@@ -22,17 +22,20 @@
   include GraphViz::Utils
 
   def initialize( xGVPath, xOutFile, xOutFormat = nil ) #:nodoc:
     paths = (xGVPath.nil?) ? [] : [xGVPath]
     @xGvprPath = find_executable( 'gvpr', paths )
+    if (@xGvprPath.blank?)
+      raise Exception, "GraphViz is not installed. Please be sure that 'gvpr' is on the search path'"
+    end
     @xOutFile = xOutFile
     @xOutFormat = xOutFormat || "_"
     @gvprScript = GraphViz::Ext.find( "dot2ruby.g" )
   end
 
   def run( xFile ) #:nodoc:
-    xCmd = "#{@xGvprPath} -f #{@gvprScript} -a #{@xOutFormat} #{xFile}"
+    xCmd = [@xGvprPath, '-f', @gvprScript, '-a', @xOutFormat, xFile]
     xOutput = output_from_command( xCmd )
     if @xOutFile.nil?
       puts xOutput
     else
       File.open( @xOutFile, "w" ) do |io|
@@ -40,10 +43,10 @@
       end
     end
   end
 
   def eval( xFile ) #:nodoc:
-    xCmd = "#{@xGvprPath} -f #{@gvprScript} -a \"-\" #{xFile}"
+    xCmd = [@xGvprPath, '-f', @gvprScript, '-a', '-', xFile]
     xOutput = output_from_command( xCmd )
     instance_eval(xOutput)
     return @_graph_eval
   end