largefiles: use "outgoinghooks" to avoid redundant outgoing check

Before this patch, "hg outgoing" invokes "findcommonoutgoing()" not
only in "commands.outgoing()" but also in
"overrides.overrideoutgoing()" (via "getoutgoinglfiles()"), when
largefiles is enabled. The latter is redundant.

This patch uses "outgoinghooks" to avoid redundant outgoing check.

Newly introduced function "overrides.outgoinghook()" is registered
into "outgoinghooks" to get the result of outgoing check in
"commands.outgoing()".

It invokes "lfutil.getlfilestoupload()" directly with the result of
outgoing check to avoid redundant outgoing check in
"getoutgoinglfiles()": "sort()" is needed, because
"lfutil.getlfilestoupload()" doesn't sort the result of it.

This patch also omits "if toupload is None" ("No remote repo") case,
because failure of looking remote repository up should raise exception
in "commands.outgoing()" before invocation of "outgoinghooks".

Newly added "hg outgoing --large --graph" tests examine
"outgoinghooks" invocations in "hg outgoing --graph" code path.

hgext/largefiles/overrides.py

@@ -1005,23 +1005,19 b' def getoutgoinglfiles(ui, repo, dest=Non'
     lfutil.getlfilestoupload(repo, o, lambda fn, lfhash: toupload.add(fn))
     return sorted(toupload)
 
-def overrideoutgoing(orig, ui, repo, dest=None, **opts):
-    result = orig(ui, repo, dest, **opts)
-
+def outgoinghook(ui, repo, other, opts, missing):
     if opts.pop('large', None):
-        toupload = getoutgoinglfiles(ui, repo, dest, **opts)
-        if toupload is None:
-            ui.status(_('largefiles: No remote repo\n'))
-        elif not toupload:
+        toupload = set()
+        lfutil.getlfilestoupload(repo, missing,
+                                 lambda fn, lfhash: toupload.add(fn))
+        if not toupload:
             ui.status(_('largefiles: no files to upload\n'))
         else:
             ui.status(_('largefiles to upload:\n'))
-            for file in toupload:
+            for file in sorted(toupload):
                 ui.status(lfutil.splitstandin(file) + '\n')
             ui.status('\n')
 
-    return result
-
 def summaryremotehook(ui, repo, opts, changes):
     largeopt = opts.get('large', False)
     if changes is None:

hgext/largefiles/uisetup.py

@@ -65,10 +65,11 b' def uisetup(ui):'
     debugstateopt = [('', 'large', None, _('display largefiles dirstate'))]
     entry[1].extend(debugstateopt)
 
-    entry = extensions.wrapcommand(commands.table, 'outgoing',
-        overrides.overrideoutgoing)
+    outgoing = lambda orgfunc, *arg, **kwargs: orgfunc(*arg, **kwargs)
+    entry = extensions.wrapcommand(commands.table, 'outgoing', outgoing)
     outgoingopt = [('', 'large', None, _('display outgoing largefiles'))]
     entry[1].extend(outgoingopt)
+    cmdutil.outgoinghooks.add('largefiles', overrides.outgoinghook)
     entry = extensions.wrapcommand(commands.table, 'summary',
                                    overrides.overridesummary)
     summaryopt = [('', 'large', None, _('display outgoing largefiles'))]

tests/test-largefiles.t

@@ -703,7 +703,6 b' Test that outgoing --large works (with r'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     this used to not notice the rm
   
-  searching for changes
   largefiles to upload:
   foo
   large
@@ -2154,10 +2153,15 b' check messages when there is no files to'
   comparing with $TESTTMP/issue3651/src (glob)
   searching for changes
   no changes found
-  searching for changes
   largefiles: no files to upload
   [1]
 
+  $ hg -R clone2 outgoing --large --graph --template "{rev}"
+  comparing with $TESTTMP/issue3651/src (glob)
+  searching for changes
+  no changes found
+  largefiles: no files to upload
+
 check messages when there are files to upload:
 
   $ echo b > clone2/b
@@ -2181,7 +2185,14 b' check messages when there are files to u'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     #1
   
+  largefiles to upload:
+  b
+  
+  $ hg -R clone2 outgoing --large --graph --template "{rev}"
+  comparing with $TESTTMP/issue3651/src
   searching for changes
+  @  1
+  
   largefiles to upload:
   b