fiddle with pyvips8 docstrings

TODO

@@ -2,7 +2,20 @@
 
 - can we generate python docstrings?
 
-  when we make a __getattr__ object, make it respond to __doc__
+  this works
+
+  	help(Vips.Image.black)
+
+  but this does not
+
+  	help(Vips.Image.add)
+
+  since add is an instance method ... this does work
+
+  	a = Vips.Image.black(10, 10)
+	help(a.add)
+
+  do we need to override __getattribute__ as well?
 
 - test other arg types
 

python/Vips.py

@@ -418,7 +418,11 @@ class Image(Vips.Image):
         if name in dir(self.props):
             return getattr(self.props, name)
 
-        return lambda *args, **kwargs: _call_instance(self, name, args, kwargs)
+        def call_function(*args, **kwargs):
+            return _call_instance(self, name, args, kwargs)
+        call_function.__doc__ = "hello world, from " + name
+
+        return call_function
 
     def __add__(self, other):
         if isinstance(other, Vips.Image):
@@ -747,8 +751,15 @@ class_methods = [
                     "fitsload",
                     "openexrload"]
 
+def add_doc(value):
+    def _doc(func):
+        func.__doc__ = value
+        return func
+    return _doc
+
 def generate_class_method(name):
     @classmethod
+    @add_doc('hello, world!')
     def class_method(cls, *args, **kwargs):
         return _call_base(name, args, kwargs)