ipy_leo: do not crash if _p has been deleted in push

IPython/Extensions/ipy_leo.py

@@ -1,575 +1,575 b''
 """ ILeo - Leo plugin for IPython
 
    
 """
 import IPython.ipapi
 import IPython.genutils
 import IPython.generics
 from IPython.hooks import CommandChainDispatcher
 import re
 import UserDict
 from IPython.ipapi import TryNext 
 import IPython.macro
 
 def init_ipython(ipy):
     """ This will be run by _ip.load('ipy_leo') 
     
     Leo still needs to run update_commander() after this.
     
     """
     global ip
     ip = ipy
     ip.set_hook('complete_command', mb_completer, str_key = '%mb')
     ip.expose_magic('mb',mb_f)
     ip.expose_magic('lee',lee_f)
     ip.expose_magic('leoref',leoref_f)
     expose_ileo_push(push_cl_node,100)
     # this should be the LAST one that will be executed, and it will never raise TryNext
     expose_ileo_push(push_ipython_script, 1000)
     expose_ileo_push(push_plain_python, 100)
     expose_ileo_push(push_ev_node, 100)
     global wb
     wb = LeoWorkbook()
     ip.user_ns['wb'] = wb 
     
     show_welcome()
 
 
 def update_commander(new_leox):
     """ Set the Leo commander to use
     
     This will be run every time Leo does ipython-launch; basically,
     when the user switches the document he is focusing on, he should do
     ipython-launch to tell ILeo what document the commands apply to.
     
     """
     
     global c,g
     c,g = new_leox.c, new_leox.g
     print "Set Leo Commander:",c.frame.getTitle()
     
     # will probably be overwritten by user, but handy for experimentation early on
     ip.user_ns['c'] = c
     ip.user_ns['g'] = g
     ip.user_ns['_leo'] = new_leox
     
     new_leox.push = push_position_from_leo
     run_leo_startup_node()
 
 from IPython.external.simplegeneric import generic 
 import pprint
 
 def es(s):    
     g.es(s, tabName = 'IPython')
     pass
 
 @generic
 def format_for_leo(obj):
     """ Convert obj to string representiation (for editing in Leo)"""
     return pprint.pformat(obj)
 
 @format_for_leo.when_type(list)
 def format_list(obj):
     return "\n".join(str(s) for s in obj)
   
 
 attribute_re = re.compile('^[a-zA-Z_][a-zA-Z0-9_]*$')
 def valid_attribute(s):
     return attribute_re.match(s)    
 
 _rootnode = None
 def rootnode():
     """ Get ileo root node (@ipy-root) 
     
     if node has become invalid or has not been set, return None
     
     Note that the root is the *first* @ipy-root item found    
     """
     global _rootnode
     if _rootnode is None:
         return None
     if c.positionExists(_rootnode.p):
         return _rootnode
     _rootnode = None
     return None  
 
 def all_cells():
     global _rootnode
     d = {}
     r = rootnode() 
     if r is not None:
         nodes = r.p.children_iter()
     else:
         nodes = c.allNodes_iter()
 
     for p in nodes:
         h = p.headString()
         if h.strip() == '@ipy-root':
             # update root node (found it for the first time)
             _rootnode = LeoNode(p)            
             # the next recursive call will use the children of new root
             return all_cells()
         
         if h.startswith('@a '):
             d[h.lstrip('@a ').strip()] = p.parent().copy()
         elif not valid_attribute(h):
             continue 
         d[h] = p.copy()
     return d    
 
 def eval_node(n):
     body = n.b    
     if not body.startswith('@cl'):
         # plain python repr node, just eval it
         return ip.ev(n.b)
     # @cl nodes deserve special treatment - first eval the first line (minus cl), then use it to call the rest of body
     first, rest = body.split('\n',1)
     tup = first.split(None, 1)
     # @cl alone SPECIAL USE-> dump var to user_ns
     if len(tup) == 1:
         val = ip.ev(rest)
         ip.user_ns[n.h] = val
         es("%s = %s" % (n.h, repr(val)[:20]  )) 
         return val
 
     cl, hd = tup 
 
     xformer = ip.ev(hd.strip())
     es('Transform w/ %s' % repr(xformer))
     return xformer(rest, n)
 
 class LeoNode(object, UserDict.DictMixin):
     """ Node in Leo outline
     
     Most important attributes (getters/setters available:
      .v     - evaluate node, can also be alligned 
      .b, .h - body string, headline string
      .l     - value as string list
     
     Also supports iteration, 
     
     setitem / getitem (indexing):  
      wb.foo['key'] = 12
      assert wb.foo['key'].v == 12
     
     Note the asymmetry on setitem and getitem! Also other
     dict methods are available. 
     
     .ipush() - run push-to-ipython
 
     Minibuffer command access (tab completion works):
     
      mb save-to-file
     
     """
     def __init__(self,p):
         self.p = p.copy()
 
     def __str__(self):
         return "<LeoNode %s>" % str(self.p)
     
     __repr__ = __str__
     
     def __get_h(self): return self.p.headString()
     def __set_h(self,val):
         print "set head",val
         c.beginUpdate() 
         try:
             c.setHeadString(self.p,val)
         finally:
             c.endUpdate()
         
     h = property( __get_h, __set_h, doc = "Node headline string")  
 
     def __get_b(self): return self.p.bodyString()
     def __set_b(self,val):
         print "set body",val
         c.beginUpdate()
         try: 
             c.setBodyString(self.p, val)
         finally:
             c.endUpdate()
     
     b = property(__get_b, __set_b, doc = "Nody body string")
     
     def __set_val(self, val):        
         self.b = format_for_leo(val)
         
     v = property(lambda self: eval_node(self), __set_val, doc = "Node evaluated value")
     
     def __set_l(self,val):
         self.b = '\n'.join(val )
     l = property(lambda self : IPython.genutils.SList(self.b.splitlines()), 
                  __set_l, doc = "Node value as string list")
     
     def __iter__(self):
         """ Iterate through nodes direct children """
         
         return (LeoNode(p) for p in self.p.children_iter())
 
     def __children(self):
         d = {}
         for child in self:
             head = child.h
             tup = head.split(None,1)
             if len(tup) > 1 and tup[0] == '@k':
                 d[tup[1]] = child
                 continue
             
             if not valid_attribute(head):
                 d[head] = child
                 continue
         return d
     def keys(self):
         d = self.__children()
         return d.keys()
     def __getitem__(self, key):
         """ wb.foo['Some stuff'] Return a child node with headline 'Some stuff'
         
         If key is a valid python name (e.g. 'foo'), look for headline '@k foo' as well
         """  
         key = str(key)
         d = self.__children()
         return d[key]
     def __setitem__(self, key, val):
         """ You can do wb.foo['My Stuff'] = 12 to create children 
         
         This will create 'My Stuff' as a child of foo (if it does not exist), and 
         do .v = 12 assignment.
         
         Exception:
         
         wb.foo['bar'] = 12
         
         will create a child with headline '@k bar', because bar is a valid python name
         and we don't want to crowd the WorkBook namespace with (possibly numerous) entries
         """
         key = str(key)
         d = self.__children()
         if key in d:
             d[key].v = val
             return
         
         if not valid_attribute(key):
             head = key
         else:
             head = '@k ' + key
         p = c.createLastChildNode(self.p, head, '')
         LeoNode(p).v = val
         
     def ipush(self):
         """ Does push-to-ipython on the node """
         push_from_leo(self)
         
     def go(self):
         """ Set node as current node (to quickly see it in Outline) """
         c.beginUpdate()
         try:
             c.setCurrentPosition(self.p)
         finally:
             c.endUpdate()  
         
     def script(self):
         """ Method to get the 'tangled' contents of the node
         
         (parse @others, << section >> references etc.)
         """
         return g.getScript(c,self.p,useSelectedText=False,useSentinels=False)
     
     def __get_uA(self):
         p = self.p
         # Create the uA if necessary.
         if not hasattr(p.v.t,'unknownAttributes'):
             p.v.t.unknownAttributes = {}        
         
         d = p.v.t.unknownAttributes.setdefault('ipython', {})
         return d        
     
     uA = property(__get_uA, doc = "Access persistent unknownAttributes of node")
         
 
 class LeoWorkbook:
     """ class for 'advanced' node access 
     
     Has attributes for all "discoverable" nodes. Node is discoverable if it 
     either
     
     - has a valid python name (Foo, bar_12)
     - is a parent of an anchor node (if it has a child '@a foo', it is visible as foo)
     
     """
     def __getattr__(self, key):
         if key.startswith('_') or key == 'trait_names' or not valid_attribute(key):
             raise AttributeError
         cells = all_cells()
         p = cells.get(key, None)
         if p is None:
             return add_var(key)
 
         return LeoNode(p)
 
     def __str__(self):
         return "<LeoWorkbook>"
     def __setattr__(self,key, val):
         raise AttributeError("Direct assignment to workbook denied, try wb.%s.v = %s" % (key,val))
         
     __repr__ = __str__
     
     def __iter__(self):
         """ Iterate all (even non-exposed) nodes """
         cells = all_cells()
         return (LeoNode(p) for p in c.allNodes_iter())
     
     current = property(lambda self: LeoNode(c.currentPosition()), doc = "Currently selected node")
     
     def match_h(self, regex):
         cmp = re.compile(regex)
         for node in self:
             if re.match(cmp, node.h, re.IGNORECASE):
                 yield node
         return
 
 @IPython.generics.complete_object.when_type(LeoWorkbook)
 def workbook_complete(obj, prev):
     return all_cells().keys() + [s for s in prev if not s.startswith('_')]
     
 
 def add_var(varname):
     c.beginUpdate()
     r = rootnode()
     try:
         if r is None:
             p2 = g.findNodeAnywhere(c,varname)
         else:
             p2 = g.findNodeInChildren(c, r.p, varname)
         if p2:
             return LeoNode(p2)
 
         if r is not None:
             p2 = r.p.insertAsLastChild()
         
         else:
             p2 =  c.currentPosition().insertAfter()
         
         c.setHeadString(p2,varname)
         return LeoNode(p2)
     finally:
         c.endUpdate()
 
 def add_file(self,fname):
     p2 = c.currentPosition().insertAfter()
 
 push_from_leo = CommandChainDispatcher()
 
 def expose_ileo_push(f, prio = 0):
     push_from_leo.add(f, prio)
 
 def push_ipython_script(node):
     """ Execute the node body in IPython, as if it was entered in interactive prompt """
     c.beginUpdate()
     try:
         ohist = ip.IP.output_hist 
         hstart = len(ip.IP.input_hist)
         script = node.script()
         
         script = g.splitLines(script + '\n')
         ip.user_ns['_p'] = node
         ip.runlines(script)
-        del ip.user_ns['_p']
+        ip.user_ns.pop('_p',None)
         
         has_output = False
         for idx in range(hstart,len(ip.IP.input_hist)):
             val = ohist.get(idx,None)
             if val is None:
                 continue
             has_output = True
             inp = ip.IP.input_hist[idx]
             if inp.strip():
                 es('In: %s' % (inp[:40], ))
                 
             es('<%d> %s' % (idx, pprint.pformat(ohist[idx],width = 40)))
         
         if not has_output:
             es('ipy run: %s (%d LL)' %( node.h,len(script)))
     finally:
         c.endUpdate()
 
     
 def eval_body(body):
     try:
         val = ip.ev(body)
     except:
         # just use stringlist if it's not completely legal python expression
         val = IPython.genutils.SList(body.splitlines())
     return val 
     
 def push_plain_python(node):
     if not node.h.endswith('P'):
         raise TryNext
     script = node.script()
     lines = script.count('\n')
     try:
         exec script in ip.user_ns
     except:
         print " -- Exception in script:\n"+script + "\n --"
         raise
     es('ipy plain: %s (%d LL)' % (node.h,lines))
     
 
 def push_cl_node(node):
     """ If node starts with @cl, eval it
     
     The result is put as last child of @ipy-results node, if it exists
     """
     if not node.b.startswith('@cl'):
         raise TryNext
         
     p2 = g.findNodeAnywhere(c,'@ipy-results')
     val = node.v
     if p2:
         es("=> @ipy-results")
         LeoNode(p2).v = val
     es(val)
 
 def push_ev_node(node):
     """ If headline starts with @ev, eval it and put result in body """
     if not node.h.startswith('@ev '):
         raise TryNext
     expr = node.h.lstrip('@ev ')
     es('ipy eval ' + expr)
     res = ip.ev(expr)
     node.v = res
     
     
 def push_position_from_leo(p):
     push_from_leo(LeoNode(p))         
 
 @generic
 def edit_object_in_leo(obj, varname):
     """ Make it @cl node so it can be pushed back directly by alt+I """
     node = add_var(varname)
     formatted = format_for_leo(obj)
     if not formatted.startswith('@cl'):
         formatted = '@cl\n' + formatted
     node.b = formatted 
     node.go()
     
 @edit_object_in_leo.when_type(IPython.macro.Macro)
 def edit_macro(obj,varname):
     bod = '_ip.defmacro("""\\\n' + obj.value + '""")'
     node = add_var('Macro_' + varname)
     node.b = bod
     node.go()
 
 def get_history(hstart = 0):
     res = []
     ohist = ip.IP.output_hist 
 
     for idx in range(hstart, len(ip.IP.input_hist)):
         val = ohist.get(idx,None)
         has_output = True
         inp = ip.IP.input_hist_raw[idx]
         if inp.strip():
             res.append('In [%d]: %s' % (idx, inp))
         if val:
             res.append(pprint.pformat(val))
             res.append('\n')    
     return ''.join(res)
     
     
 def lee_f(self,s):
     """ Open file(s)/objects in Leo
     
     - %lee hist -> open full session history in leo
     - Takes an object
     - Takes an mglob pattern, e.g. '%lee *.cpp' or %leo 'rec:*.cpp'  
     """
     import os
     
     c.beginUpdate()
     try:
         if s == 'hist':
             wb.ipython_history.b = get_history()
             wb.ipython_history.go()
             return
         
             
         
         # try editing the object directly
         obj = ip.user_ns.get(s, None)
         if obj is not None:
             edit_object_in_leo(obj,s)
             return
         
         # if it's not object, it's a file name / mglob pattern
         from IPython.external import mglob
         
         files = (os.path.abspath(f) for f in mglob.expand(s))
         for fname in files:
             p = g.findNodeAnywhere(c,'@auto ' + fname)
             if not p:
                 p = c.currentPosition().insertAfter()
             
             p.setHeadString('@auto ' + fname)
             if os.path.isfile(fname):
                 c.setBodyString(p,open(fname).read())
             c.selectPosition(p)
         print "Editing file(s), press ctrl+shift+w in Leo to write @auto nodes"
     finally:
         c.endUpdate()
 
 
 
 def leoref_f(self,s):
     """ Quick reference for ILeo """
     import textwrap
     print textwrap.dedent("""\
     %leoe file/object - open file / object in leo
     wb.foo.v  - eval node foo (i.e. headstring is 'foo' or '@ipy foo')
     wb.foo.v = 12 - assign to body of node foo
     wb.foo.b - read or write the body of node foo
     wb.foo.l - body of node foo as string list
     
     for el in wb.foo:
       print el.v
        
     """
     )
 
 
 
 def mb_f(self, arg):
     """ Execute leo minibuffer commands 
     
     Example:
      mb save-to-file
     """
     c.executeMinibufferCommand(arg)
 
 def mb_completer(self,event):
     """ Custom completer for minibuffer """
     cmd_param = event.line.split()
     if event.line.endswith(' '):
         cmd_param.append('')
     if len(cmd_param) > 2:
         return ip.IP.Completer.file_matches(event.symbol)
     cmds = c.commandsDict.keys()
     cmds.sort()
     return cmds
 
 def show_welcome():
     print "------------------"
     print "Welcome to Leo-enabled IPython session!"
     print "Try %leoref for quick reference."
     import IPython.platutils
     IPython.platutils.set_term_title('ILeo')
     IPython.platutils.freeze_term_title()
 
 def run_leo_startup_node():
     p = g.findNodeAnywhere(c,'@ipy-startup')
     if p:
         print "Running @ipy-startup nodes"
         for n in LeoNode(p):
             push_from_leo(n)