gclient: use the print function

This makes the code work both in python2 and python3.

Review URL: https://codereview.chromium.org/1433153003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297516 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -76,6 +76,8 @@
 #     target_os = [ "ios" ]
 #     target_os_only = True
 
+from __future__ import print_function
+
 __version__ = '0.7'
 
 import ast
@@ -244,7 +246,7 @@ class DependencySettings(GClientKeywords):
     if (self._custom_vars.get('webkit_trunk', '') ==
         'svn://svn-mirror.golo.chromium.org/webkit-readonly/trunk'):
       new_url = 'svn://svn-mirror.golo.chromium.org/blink/trunk'
-      print 'Overwriting Var("webkit_trunk") with %s' % new_url
+      print('Overwriting Var("webkit_trunk") with %s' % new_url)
       self._custom_vars['webkit_trunk'] = new_url
 
     # Post process the url to remove trailing slashes.
@@ -884,24 +886,24 @@ class Dependency(gclient_utils.WorkItem, DependencySettings):
 
               match = re.match('^Binary file ([^\0]+) matches$', line)
               if match:
-                print 'Binary file %s matches\n' % mod_path(match.group(1))
+                print('Binary file %s matches\n' % mod_path(match.group(1)))
                 return
 
               items = line.split('\0')
               if len(items) == 2 and items[1]:
-                print '%s : %s' % (mod_path(items[0]), items[1])
+                print('%s : %s' % (mod_path(items[0]), items[1]))
               elif len(items) >= 2:
                 # Multiple null bytes or a single trailing null byte indicate
                 # git is likely displaying filenames only (such as with -l)
-                print '\n'.join(mod_path(path) for path in items if path)
+                print('\n'.join(mod_path(path) for path in items if path))
               else:
-                print line
+                print(line)
           else:
             print_stdout = True
             filter_fn = None
 
           if parsed_url is None:
-            print >> sys.stderr, 'Skipped omitted dependency %s' % cwd
+            print('Skipped omitted dependency %s' % cwd, file=sys.stderr)
           elif os.path.isdir(cwd):
             try:
               gclient_utils.CheckCallAndFilter(
@@ -912,7 +914,7 @@ class Dependency(gclient_utils.WorkItem, DependencySettings):
               if not options.ignore:
                 raise
           else:
-            print >> sys.stderr, 'Skipped missing %s' % cwd
+            print('Skipped missing %s' % cwd, file=sys.stderr)
 
 
   @gclient_utils.lockedmethod
@@ -985,13 +987,13 @@ class Dependency(gclient_utils.WorkItem, DependencySettings):
         # Use a discrete exit status code of 2 to indicate that a hook action
         # failed.  Users of this script may wish to treat hook action failures
         # differently from VC failures.
-        print >> sys.stderr, 'Error: %s' % str(e)
+        print('Error: %s' % str(e), file=sys.stderr)
         sys.exit(2)
       finally:
         elapsed_time = time.time() - start_time
         if elapsed_time > 10:
-          print "Hook '%s' took %.2f secs" % (
-              gclient_utils.CommandToStr(hook), elapsed_time)
+          print("Hook '%s' took %.2f secs" % (
+              gclient_utils.CommandToStr(hook), elapsed_time))
 
   def RunPreDepsHooks(self):
     assert self.processed
@@ -1010,13 +1012,13 @@ class Dependency(gclient_utils.WorkItem, DependencySettings):
         # Use a discrete exit status code of 2 to indicate that a hook action
         # failed.  Users of this script may wish to treat hook action failures
         # differently from VC failures.
-        print >> sys.stderr, 'Error: %s' % str(e)
+        print('Error: %s' % str(e), file=sys.stderr)
         sys.exit(2)
       finally:
         elapsed_time = time.time() - start_time
         if elapsed_time > 10:
-          print "Hook '%s' took %.2f secs" % (
-              gclient_utils.CommandToStr(hook), elapsed_time)
+          print("Hook '%s' took %.2f secs" % (
+              gclient_utils.CommandToStr(hook), elapsed_time))
 
 
   def subtree(self, include_all):
@@ -1389,13 +1391,14 @@ been automagically updated.  The previous version is available at %s.old.
     if (options.revisions and
         len(client.dependencies) > 1 and
         any('@' not in r for r in options.revisions)):
-      print >> sys.stderr, (
-          'You must specify the full solution name like --revision %s@%s\n'
-          'when you have multiple solutions setup in your .gclient file.\n'
-          'Other solutions present are: %s.') % (
+      print(
+          ('You must specify the full solution name like --revision %s@%s\n'
+           'when you have multiple solutions setup in your .gclient file.\n'
+           'Other solutions present are: %s.') % (
               client.dependencies[0].name,
               options.revisions[0],
-              ', '.join(s.name for s in client.dependencies[1:]))
+              ', '.join(s.name for s in client.dependencies[1:])),
+          file=sys.stderr)
     return client
 
   def SetDefaultConfig(self, solution_name, deps_file, solution_url,
@@ -1519,8 +1522,8 @@ been automagically updated.  The previous version is available at %s.old.
       work_queue.enqueue(s)
     work_queue.flush(revision_overrides, command, args, options=self._options)
     if revision_overrides:
-      print >> sys.stderr, ('Please fix your script, having invalid '
-                            '--revision flags will soon considered an error.')
+      print('Please fix your script, having invalid --revision flags will soon '
+            'considered an error.', file=sys.stderr)
 
     # Once all the dependencies have been processed, it's now safe to run the
     # hooks.
@@ -1763,13 +1766,14 @@ def CMDrecurse(parser, args):
                     help='Disable progress bar that shows sub-command updates')
   options, args = parser.parse_args(args)
   if not args:
-    print >> sys.stderr, 'Need to supply a command!'
+    print('Need to supply a command!', file=sys.stderr)
     return 1
   root_and_entries = gclient_utils.GetGClientRootAndEntries()
   if not root_and_entries:
-    print >> sys.stderr, (
+    print(
         'You need to run gclient sync at least once to use \'recurse\'.\n'
-        'This is because .gclient_entries needs to exist and be up to date.')
+        'This is because .gclient_entries needs to exist and be up to date.',
+        file=sys.stderr)
     return 1
 
   # Normalize options.scm to a set()
@@ -1803,13 +1807,13 @@ def CMDgrep(parser, args):
   # We can't use optparse because it will try to parse arguments sent
   # to git grep and throw an error. :-(
   if not args or re.match('(-h|--help)$', args[0]):
-    print >> sys.stderr, (
+    print(
         'Usage: gclient grep [-j <N>] git-grep-args...\n\n'
         'Example: "gclient grep -j10 -A2 RefCountedBase" runs\n"git grep '
         '-A2 RefCountedBase" on each of gclient\'s git\nrepos with up to '
         '10 jobs.\n\nBonus: page output by appending "|& less -FRSX" to the'
-        ' end of your query.'
-        )
+        ' end of your query.',
+        file=sys.stderr)
     return 1
 
   jobs_arg = ['--jobs=1']
@@ -2177,7 +2181,7 @@ def CMDhookinfo(parser, args):
   if not client:
     raise gclient_utils.Error('client not configured; see \'gclient config\'')
   client.RunOnDeps(None, [])
-  print '; '.join(' '.join(hook) for hook in client.GetHooks(options))
+  print('; '.join(' '.join(hook) for hook in client.GetHooks(options)))
   return 0
 
 
@@ -2193,10 +2197,10 @@ def CMDverify(parser, args):
     bad_deps = dep.findDepsFromNotAllowedHosts()
     if not bad_deps:
       continue
-    print "There are deps from not allowed hosts in file %s" % dep.deps_file
+    print("There are deps from not allowed hosts in file %s" % dep.deps_file)
     for bad_dep in bad_deps:
-      print "\t%s at %s" % (bad_dep.name, bad_dep.url)
-    print "allowed_hosts:", ', '.join(dep.allowed_hosts)
+      print("\t%s at %s" % (bad_dep.name, bad_dep.url))
+    print("allowed_hosts:", ', '.join(dep.allowed_hosts))
     sys.stdout.flush()
     raise gclient_utils.Error(
         'dependencies from disallowed hosts; check your DEPS file.')
@@ -2289,13 +2293,15 @@ def main(argv):
   """Doesn't parse the arguments here, just find the right subcommand to
   execute."""
   if sys.hexversion < 0x02060000:
-    print >> sys.stderr, (
+    print(
         '\nYour python version %s is unsupported, please upgrade.\n' %
-        sys.version.split(' ', 1)[0])
+        sys.version.split(' ', 1)[0],
+        file=sys.stderr)
     return 2
   if not sys.executable:
-    print >> sys.stderr, (
-        '\nPython cannot find the location of it\'s own executable.\n')
+    print(
+        '\nPython cannot find the location of it\'s own executable.\n',
+        file=sys.stderr)
     return 2
   fix_encoding.fix_encoding()
   disable_buffering()
@@ -2307,7 +2313,7 @@ def main(argv):
     gclient_utils.GClientChildren.KillAllRemainingChildren()
     raise
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
-    print >> sys.stderr, 'Error: %s' % str(e)
+    print('Error: %s' % str(e), file=sys.stderr)
     return 1
   finally:
     gclient_utils.PrintWarnings()