Generate docs correctly if pexpect is not available.

Closes https://bugs.launchpad.net/ipython/+bug/462839

docs/autogen_api.py

@@ -1,65 +1,74 b''
 #!/usr/bin/env python
 """Script to auto-generate our API docs.
 """
 # stdlib imports
 import os
 import sys
 
 # local imports
 sys.path.append(os.path.abspath('sphinxext'))
 from apigen import ApiDocWriter
 
 #*****************************************************************************
 if __name__ == '__main__':
     pjoin = os.path.join
     package = 'IPython'
     outdir = pjoin('source','api','generated')
     docwriter = ApiDocWriter(package,rst_extension='.txt')
     # You have to escape the . here because . is a special char for regexps.
     # You must do make clean if you change this!
     docwriter.package_skip_patterns += [r'\.fixes$',
                                         r'\.external$',
                                         r'\.extensions',
                                         r'\.kernel\.config',
                                         r'\.attic',
                                         r'\.quarantine',
                                         r'\.deathrow',
                                         r'\.config\.default',
                                         r'\.config\.profile',
                                         r'\.frontend',
                                         r'\.gui'
                                         ]
 
     docwriter.module_skip_patterns += [ r'\.core\.fakemodule',
                                         
                                         # XXX These need fixing, disabling for
                                         # now but we need to figure out why
                                         # they are breaking.  Error from sphinx
                                         # for each group copied below
                                         
                                         # AttributeError: __abstractmethods__
                                         r'\.core\.component',
                                         r'\.utils\.traitlets',
         
                                         # AttributeError: __provides__
                                         r'\.kernel\.clusterdir',
                                         r'\.kernel\.configobjfactory',
                                         r'\.kernel\.fcutil',
                                         r'\.kernel\.ipcontrollerapp',
                                         r'\.kernel\.launcher',
                                         r'\.kernel\.task',
                                         r'\.kernel\.winhpcjob',
                                         r'\.testing\.util',
     
                                         # Keeping these disabled is OK
                                         r'\.cocoa',
                                         r'\.ipdoctest',
                                         r'\.Gnuplot',
                                         r'\.frontend\.process\.winprocess',
                                         r'\.Shell',
                                         ]
+    
+    # If we don't have pexpect, we can't load irunner, so skip any code that
+    # depends on it
+    try:
+        import pexpect
+    except ImportError:
+        docwriter.module_skip_patterns += [r'\.lib\.irunner',
+                                           r'\.testing\.mkdoctests']
+    # Now, generate the outputs
     docwriter.write_api_docs(outdir)
     docwriter.write_index(outdir, 'gen',
                           relative_to = pjoin('source','api')
                           )
     print '%d files written' % len(docwriter.written_modules)