extensions: add getwrapperchain to get a list of wrappers
The getwrapperchain returns a list of wrappers + the original function, making
it easier to understand what has been wrapped by whom. For example:
In : mercurial.extensions.getwrapperchain(mercurial.dispatch, '_runcommand')
Out:
[<function hgext.pager.pagecmd>,
<function hgext.color.colorcmd>,
<function hgext.zeroconf.cleanupafterdispatch>,
<function mercurial.dispatch._runcommand>]
It will also be useful to safely unwrap a function. See the next patch.
--- a/mercurial/extensions.py Wed Aug 10 15:21:42 2016 +0100
+++ b/mercurial/extensions.py Wed Aug 10 15:21:42 2016 +0100
@@ -309,6 +309,22 @@
setattr(container, funcname, wrap)
return origfn
+def getwrapperchain(container, funcname):
+ '''get a chain of wrappers of a function
+
+ Return a list of functions: [newest wrapper, ..., oldest wrapper, origfunc]
+
+ The wrapper functions are the ones passed to wrapfunction, whose first
+ argument is origfunc.
+ '''
+ result = []
+ fn = getattr(container, funcname)
+ while fn:
+ assert callable(fn)
+ result.append(getattr(fn, '_unboundwrapper', fn))
+ fn = getattr(fn, '_origfunc', None)
+ return result
+
def _disabledpaths(strip_init=False):
'''find paths of disabled extensions. returns a dict of {name: path}
removes /__init__.py from packages if strip_init is True'''