[PATCH 07 of 10 shelve-ext v4] shelve: add shelve type saving and loading

[Kostia Balytskyi]

# HG changeset patch
# User Kostia Balytskyi <ikostia at fb.com>
# Date 1489250294 28800
#      Sat Mar 11 08:38:14 2017 -0800
# Node ID 5179d6be9d6a33071c8a18cc48166a3f1d5ceec5
# Parent  2dbff12d9b22281c8d84328704095d72b3151388
shelve: add shelve type saving and loading

We need shelve type to be stored in .hg/shelvedstate in order
to be able to run abort or continue action properly. If the shelve
is obsbased, those actions should create markes, if it is traditional,
the actions should strip commits.

diff --git a/hgext/shelve.py b/hgext/shelve.py
--- a/hgext/shelve.py
+++ b/hgext/shelve.py
@@ -183,6 +183,8 @@ class shelvedstate(object):
     _filename = 'shelvedstate'
     _keep = 'keep'
     _nokeep = 'nokeep'
+    _obsbased = 'obsbased'
+    _traditional = 'traditional'
 
     def __init__(self, ui, repo):
         self.ui = ui
@@ -204,6 +206,7 @@ class shelvedstate(object):
             nodestoprune = [nodemod.bin(h) for h in fp.readline().split()]
             branchtorestore = fp.readline().strip()
             keep = fp.readline().strip() == cls._keep
+            obsshelve = fp.readline().strip() == cls._obsbased
         except (ValueError, TypeError) as err:
             raise error.CorruptedState(str(err))
         finally:
@@ -218,6 +221,7 @@ class shelvedstate(object):
             obj.nodestoprune = nodestoprune
             obj.branchtorestore = branchtorestore
             obj.keep = keep
+            obj.obsshelve = obsshelve
         except error.RepoLookupError as err:
             raise error.CorruptedState(str(err))
 
@@ -225,7 +229,7 @@ class shelvedstate(object):
 
     @classmethod
     def save(cls, repo, name, originalwctx, pendingctx, nodestoprune,
-             branchtorestore, keep=False):
+             branchtorestore, keep=False, obsshelve=False):
         fp = repo.vfs(cls._filename, 'wb')
         fp.write('%i\n' % cls._version)
         fp.write('%s\n' % name)
@@ -237,6 +241,7 @@ class shelvedstate(object):
                  ' '.join([nodemod.hex(n) for n in nodestoprune]))
         fp.write('%s\n' % branchtorestore)
         fp.write('%s\n' % (cls._keep if keep else cls._nokeep))
+        fp.write('%s\n' % (cls._obsbased if obsshelve else cls._traditional))
         fp.close()
 
     @classmethod