Merge pull request #4348 from jakobgager/openpdf

Call PDF viewer after latex compiling (nbconvert)

Add a configurable to open the pdf after compiling.
Uses the default application.

closes  #4291

IPython/nbconvert/nbconvertapp.py

@@ -88,7 +88,7 b' class NbConvertApp(BaseIPythonApplication):'
     
     def _classes_default(self):
         classes = [NbConvertBase, ProfileDir]
-        for pkg in (exporters, preprocessors, writers):
+        for pkg in (exporters, preprocessors, writers, postprocessors):
             for name in dir(pkg):
                 cls = getattr(pkg, name)
                 if isinstance(cls, type) and issubclass(cls, Configurable):

IPython/nbconvert/postprocessors/pdf.py

@@ -15,6 +15,7 b' Contains writer for writing nbconvert output to PDF.'
 
 import subprocess
 import os
+import sys
 
 from IPython.utils.traitlets import Integer, List, Bool
 
@@ -44,6 +45,9 b' class PDFPostProcessor(PostProcessorBase):'
         config=True, help="""
         Filename extensions of temp files to remove after running.
         """)
+    pdf_open = Bool(False, config=True, help="""
+        Whether or not to open the pdf after the compile call.
+        """)
 
     def run_command(self, command_list, filename, count, log_function):
         """Run command_list count times.
@@ -113,6 +117,16 b' class PDFPostProcessor(PostProcessorBase):'
             except OSError:
                 pass
 
+    def open_pdf(self, filename):
+        """Open the pdf in the default viewer."""
+        if sys.platform.startswith('darwin'):
+            subprocess.call(('open', filename))
+        elif os.name == 'nt':
+            os.startfile(filename)
+        elif os.name == 'posix':
+            subprocess.call(('xdg-open', filename))
+        return
+
     def postprocess(self, filename):
         """Build a PDF by running pdflatex and bibtex"""
         self.log.info("Building PDF")
@@ -128,5 +142,8 b' class PDFPostProcessor(PostProcessorBase):'
         filename = os.path.splitext(filename)[0]
         if os.path.isfile(filename+'.pdf'):
             self.log.info('PDF successfully created')
+            if self.pdf_open: 
+                self.log.info('Viewer called')
+                self.open_pdf(filename+'.pdf')
         return
-
+