[PATCH 2 of 6] verify: move widely used variables into class members

[Durham Goode]

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1450485759 28800
#      Fri Dec 18 16:42:39 2015 -0800
# Node ID 0a65ac172df21e4cf0bc31bee016b08d0d0c79e3
# Parent  8d978bb49549a93197ad5748f218cdf19ded6fb9
verify: move widely used variables into class members

This will allow us to start moving some of the nested functions inside verify()
out onto the class.

This will allow extensions to hook into verify more easily.

diff --git a/mercurial/verify.py b/mercurial/verify.py
--- a/mercurial/verify.py
+++ b/mercurial/verify.py
@@ -24,7 +24,7 @@ from . import (
 def verify(repo):
     lock = repo.lock()
     try:
-        return verifier().verify(repo)
+        return verifier(repo).verify()
     finally:
         lock.release()
 
@@ -47,19 +47,31 @@ def _validpath(repo, path):
     return True
 
 class verifier(object):
-    def verify(self, repo):
-        repo = repo.unfiltered()
+    def __init__(self, repo):
+        self.repo = repo.unfiltered()
+        self.ui = repo.ui
+        self.badrevs = set()
+        self.errors = [0]
+        self.warnings = [0]
+        self.havecl = len(repo.changelog) > 0
+        self.havemf = len(repo.manifest) > 0
+        self.revlogv1 = repo.changelog.version != revlog.REVLOGV0
+        self.lrugetctx = util.lrucachefunc(repo.changectx)
+        self.refersmf = False
+
+    def verify(self):
+        repo = self.repo
         mflinkrevs = {}
         filelinkrevs = {}
         filenodes = {}
         revisions = 0
-        badrevs = set()
-        errors = [0]
-        warnings = [0]
+        badrevs = self.badrevs
+        errors = self.errors
+        warnings = self.warnings
         ui = repo.ui
         cl = repo.changelog
         mf = repo.manifest
-        lrugetctx = util.lrucachefunc(repo.changectx)
+        lrugetctx = self.lrugetctx
 
         if not repo.url().startswith('file:'):
             raise error.Abort(_("cannot verify bundle or remote repos"))
@@ -142,16 +154,15 @@ class verifier(object):
         if os.path.exists(repo.sjoin("journal")):
             ui.warn(_("abandoned transaction found - run hg recover\n"))
 
-        revlogv1 = cl.version != revlog.REVLOGV0
+        revlogv1 = self.revlogv1
         if ui.verbose or not revlogv1:
             ui.status(_("repository uses revlog format %d\n") %
                            (revlogv1 and 1 or 0))
 
-        havecl = len(cl) > 0
-        havemf = len(mf) > 0
+        havecl = self.havecl
+        havemf = self.havemf
 
         ui.status(_("checking changesets\n"))
-        refersmf = False
         seen = {}
         checklog(cl, "changelog", 0)
         total = len(repo)
@@ -164,18 +175,18 @@ class verifier(object):
                 changes = cl.read(n)
                 if changes[0] != nullid:
                     mflinkrevs.setdefault(changes[0], []).append(i)
-                    refersmf = True
+                    self.refersmf = True
                 for f in changes[3]:
                     if _validpath(repo, f):
                         filelinkrevs.setdefault(_normpath(f), []).append(i)
             except Exception as inst:
-                refersmf = True
+                self.refersmf = True
                 exc(i, _("unpacking changeset %s") % short(n), inst)
         ui.progress(_('checking'), None)
 
         ui.status(_("checking manifests\n"))
         seen = {}
-        if refersmf:
+        if self.refersmf:
             # Do not check manifest if there are only changelog entries with
             # null manifests.
             checklog(mf, "manifest", 0)