import: allow processing of extra part header after import

As we have a way for extension to add more header, we need a way for them to
actually process them. We add a basic hook point to do extra work after the
import have been committed.

mercurial/cmdutil.py

@@ -834,6 +834,7 b' def service(opts, parentfn=None, initfn='
 ## facility to let extension process additional data into an import patch
 # list of identifier to be executed in order
 extrapreimport = []  # run before commit
+extrapostimport = [] # run after commit
 # mapping from identifier to actual import function
 #
 # 'preimport' are run before the commit is made and are provided the following
@@ -846,6 +847,10 b' extrapreimport = [] # run before commit'
 # mutation of in memory commit and more. Feel free to rework the code to get
 # there.
 extrapreimportmap = {}
+# 'postimport' are run after the commit is made and are provided the following
+# argument:
+# - ctx: the changectx created by import.
+extrapostimportmap = {}
 
 def tryimportone(ui, repo, hunk, parents, opts, msgs, updatefunc):
     """Utility function used by commands.import to import a single patch
@@ -974,6 +979,8 b' def tryimportone(ui, repo, hunk, parents'
                     n = repo.commit(message, opts.get('user') or user,
                                     opts.get('date') or date, match=m,
                                     editor=editor, extra=extra)
+                    for idfunc in extrapostimport:
+                        extrapostimportmap[idfunc](repo[n])
                 finally:
                     repo.ui.restoreconfig(allowemptyback)
             dsguard.close()

tests/test-import.t

@@ -1516,10 +1516,15 b' Importing some extra header'
   > def processfoo(repo, data, extra, opts):
   >     if 'foo' in data:
   >         extra['foo'] = data['foo']
+  > def postimport(ctx):
+  >     if 'foo' in ctx.extra():
+  >         ctx.repo().ui.write('imported-foo: %s\n' % ctx.extra()['foo'])
   > 
   > mercurial.patch.patchheadermap.append(('Foo', 'foo'))
   > mercurial.cmdutil.extrapreimport.append('foo')
   > mercurial.cmdutil.extrapreimportmap['foo'] = processfoo
+  > mercurial.cmdutil.extrapostimport.append('foo')
+  > mercurial.cmdutil.extrapostimportmap['foo'] = postimport
   > EOF
   $ printf "[extensions]\nparseextra=$TESTTMP/parseextra.py" >> $HGRCPATH
   $ hg up -C tip
@@ -1542,6 +1547,7 b' Importing some extra header'
   > EOF
   $ hg import $TESTTMP/foo.patch
   applying $TESTTMP/foo.patch
+  imported-foo: bar
   $ hg log --debug -r . | grep extra
   extra:       branch=default
   extra:       foo=bar