convert: svn_sink: workaround of command line size limitation on win32.

On win32, the command line arguments seems to be limited about 2400
bytes.  So 'add', 'delete', 'propget' and 'propdel' operations are
called several times within this limitation.  And also 'commit'
operation is changed to be called without passing target files not to
exceeds this limitation because it cannot be a separated like other
operations above.

hgext/convert/subversion.py

@@ -704,6 +704,27 b' exit 1'
 class svn_sink(converter_sink, commandline):
     commit_re = re.compile(r'Committed revision (\d+).', re.M)
 
+    # iterates sublist of given list for concatenated length is within limit
+    def limit_arglist(self, files):
+        if os.name != 'nt':
+            yield files
+            return
+        # When I tested on WinXP, limit = 2500 is NG, 2400 is OK
+        limit = 2000
+        bytes = 0
+        fl = []
+        for fn in files:
+            b = len(fn) + 1
+            if bytes + b < limit:
+                fl.append(fn)
+                bytes += b
+            else:
+                yield fl
+                fl = []
+                bytes = 0
+        if fl:
+            yield fl
+
     def prerun(self):
         if self.wc:
             os.chdir(self.wc)
@@ -842,12 +863,14 b' class svn_sink(converter_sink, commandli'
                     if not os.path.exists(self.wjoin(d, '.svn', 'entries'))]
         if add_dirs:
             add_dirs.sort()
-            self.run('add', non_recursive=True, quiet=True, *add_dirs)
+            for fl in self.limit_arglist(add_dirs):
+                self.run('add', non_recursive=True, quiet=True, *fl)
         return add_dirs
 
     def add_files(self, files):
         if files:
-            self.run('add', quiet=True, *files)
+            for fl in self.limit_arglist(files):
+                self.run('add', quiet=True, *fl)
         return files
 
     def tidy_dirs(self, names):
@@ -881,15 +904,18 b' class svn_sink(converter_sink, commandli'
                 self._copyfile(s, d)
             self.copies = []
         if self.delete:
-            self.run0('delete', *self.delete)
+            for fl in self.limit_arglist(self.delete):
+                self.run0('delete', *fl)
             self.delete = []
         entries.update(self.add_files(files.difference(entries)))
         entries.update(self.tidy_dirs(entries))
         if self.delexec:
-            self.run0('propdel', 'svn:executable', *self.delexec)
+            for fl in self.limit_arglist(self.delexec):
+                self.run0('propdel', 'svn:executable', *fl)
             self.delexec = []
         if self.setexec:
-            self.run0('propset', 'svn:executable', '*', *self.setexec)
+            for fl in self.limit_arglist(self.setexec):
+                self.run0('propset', 'svn:executable', '*', *fl)
             self.setexec = []
 
         fd, messagefile = tempfile.mkstemp(prefix='hg-convert-')
@@ -900,8 +926,7 b' class svn_sink(converter_sink, commandli'
             output = self.run0('commit',
                                username=util.shortuser(commit.author),
                                file=messagefile,
-                               encoding='utf-8',
-                               *list(entries))
+                               encoding='utf-8')
             try:
                 rev = self.commit_re.search(output).group(1)
             except AttributeError: