merge: make calculateupdates() return file->action dict

This simplifies largefiles' overridecalculateupdates(), which no
longer has to do the conversion it started doing in 38e55e55ae4d
(largefiles: rewrite merge code using dictionary with entry per file,
2014-12-09).

To keep this patch small, we'll leave the name 'actionbyfile' in
overrides.py. It will be renamed in the next patch.

hgext/largefiles/overrides.py

@@ -435,15 +435,13 b' def overridecalculateupdates(origfn, rep'
 
     # Convert to dictionary with filename as key and action as value.
     lfiles = set()
-    actionbyfile = {}
-    for m, l in actions.iteritems():
-        for f, args, msg in l:
-            actionbyfile[f] = m, args, msg
-            splitstandin = f and lfutil.splitstandin(f)
-            if splitstandin in p1:
-                lfiles.add(splitstandin)
-            elif lfutil.standin(f) in p1:
-                lfiles.add(f)
+    actionbyfile = actions
+    for f in actionbyfile:
+        splitstandin = f and lfutil.splitstandin(f)
+        if splitstandin in p1:
+            lfiles.add(splitstandin)
+        elif lfutil.standin(f) in p1:
+            lfiles.add(f)
 
     for lfile in lfiles:
         standin = lfutil.standin(lfile)
@@ -489,14 +487,7 b' def overridecalculateupdates(origfn, rep'
                 actionbyfile[lfile] = ('g', largs, 'replaces standin')
                 actionbyfile[standin] = ('r', None, 'replaced by non-standin')
 
-    # Convert back to dictionary-of-lists format
-    for l in actions.itervalues():
-        l[:] = []
-    actions['lfmr'] = []
-    for f, (m, args, msg) in actionbyfile.iteritems():
-        actions[m].append((f, args, msg))
-
-    return actions, diverge, renamedelete
+    return actionbyfile, diverge, renamedelete
 
 def mergerecordupdates(orig, repo, actions, branchmerge):
     if 'lfmr' in actions:

mercurial/merge.py

@@ -621,12 +621,6 b' def calculateupdates(repo, wctx, mctx, a'
         fractions = _forgetremoved(wctx, mctx, branchmerge)
         actions.update(fractions)
 
-    # Convert to dictionary-of-lists format
-    actionbyfile = actions
-    actions = dict((m, []) for m in 'a f g cd dc r dm dg m e k'.split())
-    for f, (m, args, msg) in actionbyfile.iteritems():
-        actions[m].append((f, args, msg))
-
     return actions, diverge, renamedelete
 
 def batchremove(repo, actions):
@@ -1069,9 +1063,15 b' def update(repo, node, branchmerge, forc'
             followcopies = True
 
         ### calculate phase
-        actions, diverge, renamedelete = calculateupdates(
+        actionbyfile, diverge, renamedelete = calculateupdates(
             repo, wc, p2, pas, branchmerge, force, partial, mergeancestor,
             followcopies)
+        # Convert to dictionary-of-lists format
+        actions = dict((m, []) for m in 'a f g cd dc r dm dg m e k'.split())
+        for f, (m, args, msg) in actionbyfile.iteritems():
+            if m not in actions:
+                actions[m] = []
+            actions[m].append((f, args, msg))
 
         if not util.checkcase(repo.path):
             # check collision between files only in p2 for clean update