extensions: add getwrapperchain to get a list of wrappers...
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.
