Support for files with Graphviz(dot) syntax

GraphvizPreview.py

@@ -1,34 +1,44 @@
 import sublime, sublime_plugin
 from subprocess import call
+import os
+import platform
 
 try:  # python 3
     from .helpers import surroundingGraphviz, graphvizPDF, ENVIRON
 except ValueError:  # python 2
     from helpers import surroundingGraphviz, graphvizPDF, ENVIRON
 
+DOT_SYNTAX = 'Packages/Graphviz/DOT.tmLanguage'
 
 class GraphvizPreviewCommand(sublime_plugin.TextCommand):
     def run(self, edit):
-        sel = self.view.sel()[0]
-
-        if not sel.empty():
-            code = self.view.substr(sel).strip()
-        else:
-            code = surroundingGraphviz(
-                self.view.substr(sublime.Region(0, self.view.size())),
-                sel.begin()
-            )
+        code = self.code()
 
         if not code:
             sublime.error_message('Graphviz: Please place cursor in graphviz code before running')
             return
 
-
         pdf_filename = graphvizPDF(code)
 
         try:
-            call(['open', pdf_filename], env=ENVIRON)
+            if platform.system() == 'Windows':
+                os.startfile(pdf_filename)
+            else:
+                call(['open', pdf_filename], env=ENVIRON)            
         except Exception as e:
-            sublime.error_message('Graphviz: Could not open PDF, only works for Mac... fork this repo for your OS!')
+            sublime.error_message('Graphviz: Could not open PDF, ' + str(e))
             raise e
 
+    def code(self):        
+        syntax = self.view.settings().get('syntax')
+        sel = self.view.sel()[0]
+
+        if syntax == DOT_SYNTAX:
+            return self.content()            
+        elif not sel.empty():
+            code = self.view.substr(sel).strip()
+        else:
+            code = surroundingGraphviz(self.content(), sel.begin())
+
+    def content(self):
+        return self.view.substr(sublime.Region(0, self.view.size()))

helpers.py

@@ -1,10 +1,12 @@
 from subprocess import call
 import os
+import platform
 import re
 import tempfile
 
 ENVIRON = os.environ
-ENVIRON['PATH'] += ':/usr/local/bin'
+if platform.system() != 'Windows':
+    ENVIRON['PATH'] += ':/usr/local/bin'
 
 DIGRAPH_START = re.compile('.*(digraph([ \t\n\r]+[a-zA-Z\200-\377_][a-zA-Z\200-\3770-9_]*[ \t\n\r]*{|[ \t\n\r]*{).*)', re.DOTALL | re.IGNORECASE)